Patent Publication Number: US-2023146771-A1

Title: Display Unit

Description:
TECHNICAL FIELD 
     The present invention relates to a display unit. 
     BACKGROUND ART 
     Conventionally, an electric/heat energy network is known in which electric energy and heat energy are fused together (see, for example, Patent Document 1). The electric/heat energy network connects, for example, a cogeneration system, a renewable energy source, an electricity storage portion, a heat storage portion, a power supply network, a heat energy supply system, a power load, and a heat load. Optimization of an energy management of the electric/heat energy network is executed by a control unit (computer). 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         Patent Document 1: Japanese Patent No. 6423967 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     The control unit for the energy management of the electric/heat energy network is equipped with an input unit and a display unit as man-machine interfaces. The display unit shows various entry screens, etc. There are many devices connected to an electric/heat energy network, and the information volume displayed on the display unit can easily become large. Due to this, the display unit of the management system that performs an energy management is required to display information in an organized and easy-to-read manner. 
     An object of the present invention is to provide a technology that can improve a user&#39;s convenience in a display unit possessed by a management system that manages energy. 
     Solution to Problem 
     An exemplary display unit of the present invention is a display unit possessed by a management system that manages energy, wherein plural pieces of information in the management system and related to power and heat are displayed on a single screen. 
     Advantageous Effects of Invention 
     The exemplary present invention can improve a user&#39;s convenience in a display unit possessed by a management system that manages energy. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is an image diagram of a management system. 
         FIG.  2    is a block diagram of a system controller. 
         FIG.  3    is a schematic diagram showing a state of displaying a login screen on a screen of a display unit. 
         FIG.  4    is a schematic diagram showing a state of displaying a home screen on the screen of the display unit. 
         FIG.  5    explains details of graph information displayed in each display area. 
         FIG.  6    explains about an operation of a display switch button displayed in a heat output display area. 
         FIG.  7    is a schematic diagram to explain about a home screen of a modified example. 
         FIG.  8    is a schematic diagram to explain about a home screen of another modified example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following is a detailed description of an exemplary embodiment of the present invention with reference to the drawings. 
     1. Management System 
       FIG.  1    is an image diagram of a management system  100  according to an embodiment of the present invention. The management system  100  manages energy. That is, the management system  100  is an energy management system. In detail, the management system  100  manages electric energy and heat energy. The management system  100  is applied, for example, to a residential facility, an industrial facility, or a residential/industrial facility. 
     As shown in  FIG.  1   , the management system  100  includes a system controller  1 . The management system  100  manages electric energy and heat energy, centered on the system controller  1 . The management system  100  includes a facility that is so provided as to supply electric power (electricity-related facility) and a facility that is so provided as to supply at least one of hot heat and cold heat (heat-related facility). These facilities are controlled by the system controller  1 . 
     Note that the hot heat refers to heat that is hot, and the cold heat refers to heat that is cold. That is, when the heat is distinguished into hot heat and cold heat, the hot heat is hot heat and the cold heat is cold heat. For example, the hot heat is air with a higher temperature compared to the room temperature, and the cold heat is air with a lower temperature compared to the room temperature. The facilities shown in  FIG.  1    are merely an exemplification and may be changed to a configuration lacking any of the facilities shown in  FIG.  1    or to a configuration with an additional facility not shown in  FIG.  1   . 
     In the example shown in  FIG.  1   , the management system  100  includes a renewable energy generating unit  2  and a storage battery  3  each as the electricity-related facility described above. The renewable energy generating unit  2  and the storage battery  3  operate under the control of the system controller  1 . 
     The renewable energy generating unit  2  is a unit that generates electricity using renewable energy such as solar light, wind power, hydraulic power, and geothermal power, for example. The renewable energy generating unit  2  may be, for example, a solar power or wind power generating unit. To a power supply line of the management system  100 , the renewable energy generating unit  2  can supply the power obtained from the power generation. The storage battery  3  stores power generated by a power generation facility such as the renewable energy generating unit  2 , for example, and discharges the stored power as needed. That is, the storage battery  3  can supply power to the power supply line of the management system  100 . The storage battery  3  may be, for example, a lithium-ion battery. 
     The management system  100  is connected to a power system  10 . The power system  10  is a large commercial power system that supplies power to a power-receiving facility of the management system  100 . The management system  100  can purchase electricity from the power system  10  and receive the power supply. The system controller  1  is so provided as to control whether or not to receive power supply from the power system  10 . The system controller  1  may be so provided as to control whether or not power is supplied to the power system  10 . 
     In the example shown in  FIG.  1   , the management system  100  includes, as the heat-related facilities described above, a boiler  4 , a heat pump  5 , and a hot water tank  6 . The boiler  4 , the heat pump  5 , and the hot water tank  6  operate under the control of the system controller  1 . 
     To a heat supply line of the management system  100 , the boiler  4  can supply the steam or hot water&#39;s heat energy obtained by combustion of gas or other fuels. The heat pump  5  operates an engine fueled by a gas fuel or the like thereby to drive a compression unit for compressing a refrigerant, providing temperature control by the condensation or evaporation heat of the refrigerant. Here, the temperature control is, for example, the temperature control of the air in a room, etc. when the heat pump  5  is applied to an air conditioner, or the temperature control of a chiller circulating liquid when the heat pump  5  is applied to a chiller. 
     The circulating liquid is typically water as an exemplification. The heat pump  5  can perform cooling operation to cool the temperature-controlled object and heating operation to heat the temperature-controlled object. That is, the heat pump  5  can switch between hot heat and cold heat, and supply the hot heat or the cold heat to the heat supply line of the management system  100 . The hot water tank  6  is connected to the boiler  4 , etc. and is capable of exchanging the water medium in the tank to hot water and storing hot heat. The heat stored in the hot water tank  6  can be supplied to the heat supply line of the management system  100 . 
     In the example shown in  FIG.  1   , the management system  100  includes a cogeneration system  7  as a facility that is commonly used for the electricity-related facility and heat-related facility described above. The cogeneration system  7  operate under the control of the system controller  1 . The cogeneration system  7  uses gas fuel or the like thereby to drive the engine, and generates electricity using a generator that is operated by the driving of the engine. The power generated by the generator can be supplied to the power supply line of the management system  100 . To the heat supply line of the management system  100 , the cogeneration system  7  can supply the steam or hot water&#39;s heat energy obtained by a waste heat recovery boiler that uses the heat (waste heat) generated by the engine. 
     To a power load included in the management system  100 , power is supplied from the renewable energy generating unit  2 , the storage battery  3 , the power system  10 , or the cogeneration system  7 . The power load includes, for example, an electric light and various types of electric devices. To a heat load included in the management system  100 , the hot heat or cold heat from the boiler  4 , the heat pump  5 , the hot water tank  6 , or the cogeneration system  7  is supplied. The heat load includes, for example, a cooling unit, a heating unit, a refrigerator, a freezer, a hot water tank, etc. 
     2. System Controller 
       FIG.  2    is a block diagram of the system controller  1  according to the embodiment of the present invention. As shown in  FIG.  2   , the system controller  1  has a control unit  11 , an input unit  12 , and a display unit  13 . That is, the management system  100  has the display unit  13 . The management system  100  further has the control unit  11  and the input unit  12 . 
     The control unit  11  controls the entire management system  100 . The control unit  11  is so configured as to include an arithmetic operation integrated circuit such as a CPU, a RAM (Random Access Memory), a ROM (Read Only Memory), etc. With the arithmetic operation integrated circuit such as the CPU executing an arithmetic processing that accords to a computer program stored in a memory such as ROM, the control unit  11  executes various functions. 
     The input unit  12  is so provided as to allow inputting of a command to the control unit  11 . The input unit  12  includes at least one of a touch screen, a keyboard, a mouse, a touch pad, a button, and a rotary knob, for example. For example, when the input unit  12  is the touch screen, the input unit  12  and the display unit  13  may be an integrated unit. The integrated unit may also include the control unit  11 . 
     The display unit  13 , under the control of the control unit  11 , displays a screen that displays various information related to the management system  100 , and an entry screen for giving the command to the control unit  11 . The display unit  13  is composed of, for example, a liquid crystal panel or an organic EL panel. The display unit  13  may include the touch screen, in which case the display unit  13  doubles as the input unit  12 , as described above. 
     3. Screen Display of Display Unit 
     Next, a display on the screen of the display unit  13  will be described in detail. 
     (3-1. Overview of Screen Display) 
       FIG.  3    shows a schematic diagram showing a state of displaying a login screen  131  on a screen  130  of the display unit  13 . A person (user) who attempts to access the management system  100  is first required to enter predetermined information on the login screen  131 . That is, the screen for displaying various information related to the management system  100 , the entry screen for entering the command to the control unit  11 , and the like cannot be viewed without the user entering necessary information in the login screen  131 . 
     In the present embodiment, as shown in  FIG.  3   , the login screen  131  has a login information entry area  1311 . The login information entry area  1311  has a user name entry area  1311   a  for entering the user name, a password entry area  1311   b  for entering a password preliminarily associated with the user name, and a login button  1311   c . That is, on the login screen  131 , the user is required to enter the user name and the password. 
     The user name and the password are entered using, for example, the keyboard or the touch screen. In a configuration using the touch screen or mouse for entering, it may be so configured that the entering is executed using a software keyboard (virtual keyboard) that appears within the login screen  131 . The software keyboard may be, for example, so configured as to appear in the login screen  131  when the user touches or clicks the user name entry area  1311   a  or the password entry area  1311   b . A similar software keyboard may be used to enter letters and numbers on any type of screen other than the login screen  131 . 
     In the present embodiment, the top end portion of the login screen  131  has a header area  200  that extends in the right/left direction of the screen  130 . In addition, the bottom end portion of the login screen  131  has a footer area  300  that extends in the right/left direction of the screen  130 . The header area  200  and the footer area  300  are properly displayed on any type of screen other than the login screen  131 . The header area  200  displays, for example, a company logo, a menu related to the screen display, and the like. The footer area  300  displays, for example, time, a user name allowed to log in, and the like. 
     Operating the login button  1311   c  by touch or the like after the user name and the password are entered displays a home screen  132 . When at least one of the user name and the password is improper, an error message is displayed on the login screen  131 , failing to display the home screen  132 . 
       FIG.  4    is a schematic diagram showing a state of displaying the home screen  132  on the screen  130  of the display unit  13 . In the present embodiment, the home screen  132  is a screen designed to allow the supply and demand of the electric energy and heat energy in the management system  100  to be viewed at a glance. In the example shown in  FIG.  4   , the home screen  132  has the header area  200 . The header area  200  includes a menu area  400  that shows the type of screen display that can be selected. In the present embodiment, the menu area  400  includes a home button  401 , a status monitoring button  402 , a graph button  403 , a device management button  404 , and an operation setting button  405 . The touch screen, mouse, or keyboard, for example, may be used to operate each of the buttons  401  to  405 . 
     In the example shown in  FIG.  4   , the home screen  132  is in a selected state, so a selection display is provided to show the above selected state. In detail, a frame surrounding the home button  401  is displayed as the selection display. However, the selection display is not limited to the frame surrounding the button, but may be configured otherwise, such as a configuration of making a button different in color from another button, or a configuration of making a button different in hatching from another button. 
     Selecting the status monitoring button  402  displays a status monitoring screen. The status monitoring screen displays details of an operating status of each device included in the management system  100 . Each device includes the heat and electric devices. The heat device includes, for example, the heat-related facility described above (including a facility that is used also for the electricity-related facility) and the heat load (air conditioning facility, footbath facility, etc.). The electric device includes, for example, the electricity-related facility (including a facility that is used also for heat-related facility) and the power load described above. 
     Selecting the graph button  403  displays a graph screen. The graph screen displays, for example, a graph or the like showing the shift in magnitude of the hourly heat and power loads for one day as well as a breakdown of each device&#39;s output relative to the load. 
     Selecting the device management button  404  displays a device management screen. The device management screen displays device management information including input/output information of each device. 
     Selecting the operation setting button  405  displays an operation setting screen. The operation setting screen includes an entry screen for entering information related to the operation of the management system  100 . The information related to the operation includes information about the control method of the management system  100 . In the present embodiment, it is so configured that the operation setting screen can select whether an optimization control and a demand control are enabled or disabled. 
     The optimization control is a control method in which control is executed according to an optimization target selected by the user (typical example is a customer) using the management system  100 . The optimization targets include, for example, the cost priority which prioritizes the reduction of various fees borne by the user, the carbon dioxide emission priority which prioritizes the reduction of carbon dioxide emission generated by the device operation, and the primary energy consumption priority which prioritizes the reduction of primary energy consumption required for the device operation. In the present embodiment, the user can select any one of these three optimization targets. The user, when selecting the cost priority, executes the operation control prioritizing the cost reduction, assuming that the optimization control is set to be enabled. The user, when selecting the carbon dioxide emission priority, executes the operation control prioritizing the reduction of carbon dioxide emission, assuming that the optimization control is set to be enabled. The user, when selecting the primary energy consumption priority, executes the operation control prioritizing the reduction of primary energy consumption, assuming that the optimization control is set to be enabled. 
     The demand control is a control method that so controls the device included in the management system  100  that the power received from the power system  10  does not exceed the target demand value. The target demand value is set at the contract power or less. When the optimization control and the demand control are set to be enabled, in principle, the management system  100  operates by the optimization control, and when the power received approaches the target demand value, the management system  100  switches to the demand control. 
     As can be seen from the above description, the display unit  13  can display the information, which is managed by the management system  100 , by switching to multiple types of screens. In the example shown in  FIG.  4   , it is possible to switch to at least five different screens including the home screen, the status monitoring screen, the graph screen, the device management screen, and the operation setting screen. However, these screen displays are merely an exemplification, and the types of screens that can be displayed by the display unit  13  may be changed as needed. 
     In the example shown in  FIG.  4   , the menu area  400  includes a feed button  406 . Operating the feed button  406  by touch or the like switches the type of screen type selection button displayed in the menu area  400 . That is, the example shown in  FIG.  4    can display any screen other than the five types including the home screen, the status monitoring screen, the graph screen, the device management screen, and the operation setting screen. 
     Examples of screens other than the five types described above include a user management screen for entering user information, and a screen setting screen for setting a screen-related condition. 
     In the example shown in  FIG.  4   , the home screen  132  has the footer area  300 . The footer area  300  includes an icon area  301  showing the user name and a time information area  302  including date and time. In the present embodiment, operating the icon area  301  by touch or the like can execute logout. As a preferred configuration, operating the icon area  301  displays a confirmation screen on the screen in a pop-up manner to confirm whether or not the logout may be executed, and the confirmation screen allowing the logout executes the logout. 
     (3-2. Details of Home Screen) 
     Next, the home screen  132  shown in  FIG.  4    is explained in detail. The home screen  132  displays plural pieces of information that are managed by the management system  100  and that are related to power and heat. In other words, on the display unit  13 , the plural pieces of information that are in the management system  100  and that is related to power and heat are displayed on a single screen. With this configuration, the user, by viewing the single screen, can grasp the information that is in the management system  100  and that is related to power and heat. That is, user convenience can be improved. The plural pieces of information related to power and heat are preferably displayed in respectively separate areas on the single screen. In detail, in separate areas, the home screen  132  lists pieces of energy information that are managed by the management system  100  and that include power load information, received power information, generated power information, and heat load information. In other words, on the display unit  13 , pieces of energy information that are in the management system  100  and that include the power load information, the received power information, the generated power information, the heat load information, and the heat output information are displayed in separate areas on the single screen. With this configuration, the user, by viewing the single screen, can grasp the load information and output information about the power and heat in the management system  100 . That is, user convenience can be improved. 
     In the present embodiment, the heat load includes both hot heat load and cold heat load, and the heat output includes both hot heat output and cold heat output. However, this is merely an exemplification, and the heat load can be any of the hot heat load and cold heat load, and correspondingly, the heat output may be any of hot heat output and cold heat output. The heat load in the home screen  132  is a demand volume for the hot heat in a device that uses the hot heat (e.g., heating device), and the cold heat load is a demand volume for the cold heat in a device that uses the cold heat (e.g., cooling device). The hot heat output is the output of the device (e.g., boiler  4 ) that supplies the hot heat. There may be a single or multiple facilities supplying the hot heat. The cold heat output is the output of the device (e.g.,  5  heat pumps) that supplies the cold heat. There may be a single or multiple facilities supplying the cold heat. 
     The received power is power purchased from the power system  10 . The generated power is power generated by power generation facility that is possessed by the management system  100  and that includes the renewable energy generating unit  2  and the cogeneration system  7 , for example. 
     In detail, the home screen  132  includes a power load display area R 1 , a received power display area R 2 , a generated power display area R 3 , a hot heat load display area R 4 , a hot heat output display area R 5 , a cold heat load display area R 6 , and a cold heat output display area R 7 . In the present embodiment, the display areas R 1  to R 7  are each rectangular in shape. However, the shape of each of the display areas R 1  to R 7  may be any other shape, such as an oval. 
     In the present embodiment, the power load display area R 1 , the received power display area R 2 , and the generated power display area R 3 , which are display areas related to power, are lined up along the right/left direction of the screen  130 . In addition, the hot heat load display area R 4 , the hot heat output display area R 5 , the cold heat load display area R 6 , and the cold heat output display R 7 , which are display areas related to heat, are lined up along the right/left direction of the screen  130 . The display areas R 1 , R 2 , and R 3  related to power, are placed above the display areas R 4 , R 5 , R 6 , and R 7  related to heat. However, these are merely exemplifications. For example, the display areas R 1 , R 2 , and R 3  related to power may be placed below the display areas R 4 , R 5 , R 6 , and R 7  related to heat. The configuration may also be not grouped into the power and the heat. The display areas R 1 , R 2 , and R 3  related to the power and R 4 , R 5 , R 6 , and R 7  related to the heat may be lined up in the vertical direction, respectively. Further, it may be so configured that each of the display areas R 1  to R 7  can be rearranged according to the user&#39;s preference. 
     At least one of the plural areas is preferably configured to display plural types of information with different collection periods. It is also preferred that the plural types of information described above include today&#39;s information and previous day&#39;s information. 
     In the present embodiment, the plural display areas R 1  to R 7  each display plural types of information with different collection periods. In detail, display modes of the plural types of information with different collection periods are the same as each other among the plural display areas R 1  to R 7 . However, in at least one of the display areas R 1  to R 7 , the display modes of the plural types of information with different collection periods may be different from any other display area. 
     In detail, each of the display areas R 1  to R 7  shows a current value, a previous day&#39;s value, today&#39;s value, this month&#39;s value, and this year&#39;s value. The current value is an instantaneous value at the current time. The previous day&#39;s value is a cumulative value of the previous day. Today&#39;s value is a cumulative value from today&#39;s start time to the current time. This month&#39;s value is a cumulative value from this month&#39;s start time to the current time. This year&#39;s value is a cumulative value from this year&#39;s start time to the current time. 
     In the present embodiment, it is so configured that each of the display areas R 1  to R 7  displays five types of information with different collection periods (current value, previous day&#39;s value, today&#39;s value, this month&#39;s value, and this year&#39;s value), but this is an exemplification. The type and number of the pieces of the above information may be properly changed. For example, this week&#39;s value may be increased or this year&#39;s value may be changed to this week&#39;s value, as the type of information. 
     It is preferable that at least one of the areas is configured to display numerical information and graph information. However, it is sufficient that at least one of the areas is configured to display at least one of the numerical information and the graph information. 
     In the present embodiment, each of the display areas R 1  to R 7  displays the numerical information and the graph information. However, it may be so configured that only a part of the display areas R 1  to R 7  displays the numerical information and the graph information. In the present embodiment, in detail, in each of the display areas R 1  to R 7 , five types of numerical information are displayed as described above: the current value, the previous day&#39;s value, today&#39;s value, this month&#39;s value, and this year&#39;s value. In each of the display areas R 1  to R 7 , two types of graph information are displayed: the previous day&#39;s value and today&#39;s value. However, the type and number of pieces of graph information to be displayed may be properly changed. 
     It is preferable that at least one of the areas is configured to display a bar graph that includes today&#39;s information and the previous day&#39;s information.  FIG.  5    explains details of the graph information displayed in each of the display areas R 1  to R 7 .  FIG.  5    extracts and shows the hot heat load display area R 4  as a representative example. The composition of the graph information in the other display areas R 1  to R 3  and R 5  to R 7  is the same as in the hot heat load display area R 4 . A display content of the hot heat load display area R 4  shown in  FIG.  5    is different from that of the hot heat load display area R 4  shown in  FIG.  4   . This is because the timing of the screen display is different between  FIG.  4    and  FIG.  5   . 
     As shown in  FIG.  5   , the hot heat load display area R 4  displays a bar graph  500  that includes a bar portion  501  showing today&#39;s information, and a bar graph  500  that includes a bar portion  502  showing the previous day&#39;s information. The bar portion  501 , which shows today&#39;s information, shows the cumulative value from today&#39;s start time to the current time. Today&#39;s start time is 00:00. The bar portion  502 , which shows the previous day&#39;s information, includes a first bar portion  5021  and a second bar portion  5022 . The first bar portion  5021  shows the cumulative value of the previous one day. The second bar portion  5022  is distinguishably displayed overlapping the first bar portion  5021 , and shows a cumulative value from the previous day&#39;s start time to the previous day&#39;s current time (same as today&#39;s current time). 
     In the present embodiment, the first bar portion  5021  is shown in white, and the second bar portion  5022  is shown with hatching, making it possible to distinguish the first bar portion  5021  from the second bar portion  5022 . However, any other display method may be used, as long as the two can be distinguished when overlapped. 
     In the present embodiment, as a preferred mode, the plural pieces of information that are displayed on the home screen  132  (single screen) and that are related to power and heat further include used fuel volume information showing used fuel volume in the management system  100 . 
     In detail, as shown in  FIG.  4   , the home screen  132  includes a used fuel volume display area R 8 . The used fuel volume display area R 8  is rectangular in shape like the other display areas R 1  to R 7 , but the above shape may be properly changed. In the used fuel volume display area R 8 , plural types of information with different collection periods are also displayed, and the display mode is the same as in the other display areas 
     R 1  to R 7 . That is, the used fuel volume display area R 8  shows the current value, the previous day&#39;s value, today&#39;s value, this month&#39;s value, and this year&#39;s value. The used fuel volume display area R 8  also displays the bar graph  500 . However, the above display mode may be properly changed, like the display areas R 1  to R 7  above. In the present embodiment, the used fuel volume display area R 8  is placed below the hot heat load display area R 4 , but this placement may be properly changed. 
     In the present embodiment, as a preferred mode, the area displaying the used fuel volume information is displayable in a manner to switch information for each type of the fuel. 
     In detail, a fuel type switch button  700  is displayed above the used fuel volume display area R 8 . In the present embodiment, four types of buttons are displayed: natural gas, propane gas, biogas, and liquid fuel. Operating by touch or the like any of the four types of fuel type switch buttons  700  displays the used volume information for the corresponding fuel. In the present embodiment, it is so configured that four types of fuel type switch buttons  700  are displayed, but the type and number of buttons may be properly changed. 
     Further, in the present embodiment, as a preferred mode, the plural pieces of information that are displayed on the home screen  132  (single screen) and that are related to power and heat further include at least one of energy consumption information showing energy consumption in the management system  100 , and carbon dioxide emission volume information showing carbon dioxide emission volume in the management system  100 . 
     In detail, as shown in  FIG.  4   , the home screen  132  includes a primary energy consumption display area R 9  and a carbon dioxide (CO 2 ) emission volume display area R 10 . These display areas R 9  and R 10  are rectangular in shape like the other display areas R 1  to R 8  described above, but the above shape may be properly changed. In these display areas R 9  and R 10 , plural types of information with different collection periods are also displayed, and their display modes are generally the same as in the other display areas R 1  to R 8 . However, the current value is not displayed. That is, the primary energy consumption display area R 9  and the carbon dioxide emission volume display area R 10  display the previous day&#39;s value, today&#39;s value, this month&#39;s value, and this year&#39;s value. In addition, the primary energy consumption display area R 9  and the carbon dioxide emission volume display area R 10  display the bar graph  500 . However, these display modes may be properly changed, like the display areas R 1  to R 8  described above. In the present embodiment, the primary energy consumption display area R 9  is placed below the hot heat output display area R 5 , and the carbon dioxide emission volume display area R 10  is placed below the cold heat load display area R 6 , but these placements may be properly changed. 
     In the present embodiment, as a preferred mode, the home screen  132  further includes a control state display area  600  that shows the control state of the management system  100 . 
     As shown in  FIG.  4   , in the embodiment, the control state display area  600  is included in the header area  200 . In detail, the control state display area  600  is placed to the right of the menu area  400 . However, the control state display area  600  may be displayed elsewhere on the home screen  132  as long as being in an easily viewable position. In the example shown in  FIG.  4   , the control state display area  600  displays “Optimize”. This shows that the management system  100  is being operated under the optimization control described above. In addition to this, “Demand Control”, “Stopped”, etc. are displayed in the control state display area  600 , for example. 
     In addition, the pieces of energy information displayed in respectively separate areas on the home screen  132  (single screen) include power breakdown information that shows the breakdown of sources of the power supplied to the power load. In detail, the home screen  132  includes a power breakdown display area R 11 . In the present embodiment, the power breakdown display area R 11  is displayed in the right/left direction together with the power load display area R 1 , the received power display area R 2 , and the and the generated power display area R 3 . However, the position at which the power breakdown display area R 11  is placed on the home screen  132  may be properly changed. 
     In detail, as shown in  FIG.  4   , the power breakdown display area R 11  uses a circular graph thereby to show the breakdown of power sources. The breakdown shown in the circular graph is a breakdown of the current power sources. However, the breakdown of the current power sources may be displayed by using any other graph, such as a band graph, not limited to the circular graph. The breakdown may also be displayed in a table format. The breakdown displayed in the circular graph is not limited to the breakdown of the current power, but may be a breakdown of the power (power amount) up to today&#39;s current time, for example. In the example shown in  FIG.  4   , all of the power loads is covered by the received power, so the power breakdown shown in the circular graph is only for the power system (denoted as Grid in the drawing). 
     In the present embodiment, at least one of the plural areas is so provided as to display a graph, which shows the breakdown of the energy sources, in a manner to be switched with other information. 
     In detail, of the plural display areas R 1  to R 11 , the hot heat output display area R 5  and the cold heat output display area R 7  are so provided that a graph showing the breakdown of the energy sources can be displayed in a manner to be switched with other information. The hot heat output display area R 5  and the cold heat output display area R 7  each display a display switch button  800 . Operating the display switch button  800  by touch or the like switches the display. 
       FIG.  6    explains about an operation of the display switch buttons  800  displayed in the hot and cold heat output display areas R 5 , R 7 . The display switch button  800 &#39;s operations in the hot heat output display area R 5  and cold heat output display area R 7  are the same, so  FIG.  6    shows the case in the hot heat output display area R 5  as a representative example. The display content of the hot heat output display area R 5  shown in  FIG.  6    is different from that of the hot heat output display area R 5  shown in  FIG.  4   . This is because the timing of the screen display is different between  FIG.  4    and  FIG.  6   . The display mode and placement of the display switch button  800  shown in  FIG.  6    are exemplifications, which may be properly changed. 
     When the numeric information of the current heat output is displayed in the hot heat output display area R 5  (display state shown on the left side in  FIG.  6   ), operating the display switch button  800  brings about a state displaying a circular graph showing the breakdown of the current hot heat output sources (display state shown on the right side in  FIG.  6   ). In the state where the circular graph showing the breakdown of the current hot heat output sources is displayed in the hot heat output display area R 5  (display state shown on the right side in  FIG.  6   ), operating the display switch button  800  returns to the state where the numerical information on the current heat output is displayed (display state shown on the left side in  FIG.  6   ). 
     In the example shown in  FIG.  6   , the breakdown of the current hot heat output sources includes the boiler (denoted as Boiler in the drawing), a first cogeneration system (denoted as EP in the drawing), and a second cogeneration system (denoted as CP in the drawing). In this example, the breakdown is shown by the circular graph, but not limited to this, the breakdown can also be shown in a band graph or the like. 
     In the present embodiment, it is so configured as to switch the display in the display areas R 5  and R 7 , but this is merely an exemplification. As shown in  FIG.  7   , it may be so configured that, when a request is made to display a graph showing the breakdown of the energy sources, some display areas is deleted and a display area displaying a graph showing the breakdown of the energy sources appears in a space left by the deleting. 
       FIG.  7    is a schematic diagram to explain about a home screen  132 A of a modified example. In the example shown in  FIG.  7   , operating a display switch button  800 A in the hot heat output display area R 5  deletes the display areas R 8 , R 9 , and R 10  (see  FIG.  4   ) below the home screen  132 A. Then, in the space vacated by the deleting, a breakdown display area R 12  is displayed, which shows a circular graph showing the breakdown of the hot heat output sources. By touch or the like, operating a deletion button  801  displayed in the breakdown display area R 12  deletes the breakdown display area R 12 . Deleting the breakdown display area R 12  displays the display areas R 8  to R 10  that were displayed before the displaying of the breakdown display area R 12 . The same operation is also obtained when the display switch button  800 A in the cold heat output display area R 7  is operated. 
     In the example shown in  FIG.  7   , it is so configured that operating the display switch button  800  deletes all of the three display areas R 8  to R 10  displayed below; however, it may be so configured that only a part of the display areas below is deleted, as long as the space for displaying the breakdown display area R 12  can be secured. A part of the display areas may be, for example, the primary energy consumption display area R 9  placed below the hot heat output display area R 5 . A part of the display areas deleted so as to secure the display space of the breakdown display area R 12  may be so configured as to be setting-changed according to the user&#39;s preference, for example. 
     When it is so configured that, in the management system  100 , only one of the heat load and the cold heat load is assumed, only one of the two displays, the one for the hot heat and the other for the cold heat, may be displayed on the home screen  132 . In such a case, as shown in  FIG.  8   , due to room made for the display space, it may be so configured that a breakdown display area R 12 A, which shows the breakdown of heat output sources, is displayed in a home screen  132 B from the beginning. 
       FIG.  8    is a schematic diagram to explain about a home screen  132 B of another modified example. The home screen  132 B shown in  FIG.  8    is so configured that the hot heat load display area R 4  and the hot heat output display area R 5  are displayed, and the cold heat load display area R 6  and the cold heat output display area R 7  are not displayed. The breakdown display area R 12 A is placed right next to the hot heat output display area R 5 . The content displayed in the breakdown display area R 12 A may be displayed in the hot heat output display area R 5 . That is, it may be so configured that some of the plural areas display a graph showing the breakdown of the energy sources alongside any other information. 
     4. Notes, Etc. 
     The various technical features disclosed in the present specification can be modified in various ways without departing from the gist of the technical creation thereof. Further, the multiple embodiments and modified examples shown in the present specification may be combined to the extent possible. 
     REFERENCE SIGNS LIST 
     
         
           13 : display unit 
           100 : management system 
           130 : screen 
           132 ,  132 A,  132 B: home screen (single screen) 
           500 : bar graph 
           501 ,  502 : bar portion 
           600 : control state display area 
           5021 : first bar portion 
           5022 : second bar portion 
         R 1  to R 12 : area