Abstract:
A method for controlling corresponding energy supply of a heat source unit of a refrigeration air conditioning system based on required energy value calculated from output power value mainly includes a controller coupled with a heat exchanger unit at the refrigeration air conditioning loading side that matches a heat source unit of a refrigeration air conditioning system. The controller includes a power value detection unit to detect the delivered loading power value, and through a center micro processing unit to process air conditioning required energy value which is transferred to a refrigeration air conditioning required energy value calculation unit to accumulate total required energy value. The total required energy value is dynamically fed to a heat source controller to control optimal heat source supply of the heat source unit such that the system is maintained the optimum operation condition to effectively save energy and achieve higher operation efficiency.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a method for controlling corresponding energy supply of a heat source unit of a refrigeration air conditioning system based on required energy value calculated from output power value for maintaining the system at an optimal energy consumption condition and reaching a higher operation efficiency. 
     2. Description of the Prior Art 
     In the past, operation of the heat source unit of a refrigeration air conditioning system is determined merely by the selection of air conditioning supply for the refrigeration air conditioning room (region) without considering the requirements of the refrigeration air conditioning room (region). As a result, excessive energy has been wasted. To remedy this shortcoming, an improved refrigeration air conditioning system has been developed and introduced as shown in FIG.  1 . Such a system mainly includes a heat source unit  11  coupling with a heat exchanger unit  12  on the refrigeration air conditioning load side. The heat exchange unit  12  on the refrigeration air conditioning loading side has a heat exchanger  13 , an air fan motor M 1 , a setting unit F 11 , a sensor T 11  and a controller  120  (also shown in FIG.  2 ). The resulting system provides refrigeration air conditioning (i.e. heat source supply) to a refrigeration air conditioning region R 10 . The controller  120 , based on the sensed and detected value TA of the sensor T 11  and setting value TAS of the setting unit F 11 , and through calculation and comparison of a central micro processing unit  121 , drives an output unit  123  and a power supply unit  122  to supply electricity to the air fan motor M 1  to control its rotation speed. Though such a system can control the rotation speed of the air fan motor M 1  and has improvement over the constant air flow of the conventional techniques, there are still disadvantages regarding energy consumption, notably the following. 
     1. While the system can control the rotation speed of the air fan motor based on requirement changes of the refrigeration air conditioning region, the heat source supply of the heat source unit has not been controlled to change synchronously. As a result, heat source unit always supplies energy at a constant rate without regarding the actual requirements of the refrigeration air conditioning region R 10 . Hence heat source supply is greater than the loading most of the time. The operation of the main machinery has to be turned on or off intermittently to supply desired amount of heat source to adjust heating load of the refrigeration air conditioning region R 10 . 
     2. Because of aforesaid phenomenon, a lot of energy is wasted. This is mainly caused by the heat source unit not being able to dynamically measure the energy requirements of the heat exchanger unit at the refrigeration air conditioning loading side and cannot supply corresponding heat source. In other words, the heat exchanger unit at the refrigeration air conditioning loading side does not dynamically provide its requirements to the heat source unit, and consequently results in huge energy loss. 
     SUMMARY OF THE INVENTION 
     In view of aforesaid disadvantages, the primary object of the invention is to provide a control method that calculates required energy value based on output power value of the refrigeration air conditioning loading side thereby allowing the heat source unit to generate corresponding heat source supply so that the heat source unit can dynamically proceed matching adjustment based on air conditioning required energy of the heat exchanger unit at the refrigeration air conditioning loading side to save energy. 
     The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a diagram of a conventional refrigeration air conditioning system. 
     FIG. 2 is a control block diagram of a conventional refrigeration air conditioning system. 
     FIG. 3 is a schematic block diagram of a control apparatus of the invention. 
     FIG. 4 is a diagram of a single unit configuration system embodiment of the invention. 
     FIG. 5 is a diagram of a single region configuration system embodiment of the invention. 
     FIG. 6 is a diagram of a multi-region configuration system embodiment of the invention. 
     FIG. 7 is a control flow chart (1) of the invention. 
     FIG. 8 is a control flow chart (2) of the invention. 
     FIG. 9 is a control flow chart (3) of the invention. 
     FIG. 10 is a control flow chart (4) of the invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIG. 3 for a schematic block diagram of a control apparatus of the invention, the apparatus mainly includes a controller  221  which consists of the following elements: 
     a central micro processing unit  2211  which is a central processing unit (CPU) for receiving various detecting values and setting parameter values, and performing comparisons and processes, and outputting corresponding values and control signals, etc; 
     a sensor T 21  including at least one sensor element for detecting the temperature value of targeting regions and transmitting the value to the central micro processing unit  2211 ; 
     a setting unit F 21  for setting parameter values to provide the central micro processing unit  2211  for comparing and processing against the detected values; 
     an output unit  2213  based on the control signals from the central micro processing unit  2211  to control a power supply unit  2212  to supply electric power to an air fan motor M 21  of a heat exchanger unit  22  at the refrigeration air conditioning loading side, such as an air fan motor M 21  of an evaporator (or the air fan motors of other air conditioning casings, indoor air fans and the like); 
     a power supply unit  2212  for supplying electric power required by the controller and the air fan motor M 21  of the heat exchanger unit  22  at the refrigeration air conditioning loading side (such as the air fan motors of air conditioning casings, indoor air fans and the like); and 
     a power value detection unit  2214  for detecting power values output from the output unit  2213 . 
     By means of the construction set forth above, the central micro processing unit  2211  can process the output power value P detected by the power value detection unit  2214  and get the required refrigeration air conditioning energy values Q 1   a   1  (Q 1   a   2 , . . . , Q 1   a n, Q 2   a   2 , . . . , Qna 1 , . . . , Qnan), then transfers to an air conditioning required energy value calculation unit B 21  to calculate total required refrigeration air conditioning energy value ΣQ. The air conditioning required energy value calculation unit B 21  has the capability of performing statistical function on the required refrigeration air conditioning energy values for various controllers  221 , and transfers the total required refrigeration air conditioning energy value ΣQ to a heat source unit controller A 20 . The controller A 20  based on the energy value ΣQ controls the heat source unit  21  to supply corresponding heat source to the amount of Qe. The heat source unit controller A 20  may also be linked to a computer center C. 
     Referring to FIG. 4 for a diagram of a single unit configuration system embodiment of the invention, the system  2  mainly includes a heat source unit  21  coupling with a heat exchanger unit  22  at the refrigeration air conditioning loading side, wherein: 
     the heat source unit  21  is linked to a heat source unit controller A 20  and receives the signals thereof, and supplies heat source to the amount of Qe corresponding to the heat exchanger unit  22  at the refrigeration air conditioning loading side; 
     the heat exchanger unit  22  at the refrigeration air conditioning loading side includes a controller  221 , a heat exchanger  222 , an air fan motor M 21 , a sensor T 21  and a setting unit F 21 . The controller  221  includes a central micro processing unit  2211 , a power supply unit  2212 , an output unit  2213  and a power value detection unit  2214 . The power value detection unit  2214  detects loading side output power value P and through the central micro processing unit  2211  to calculate the required energy value Q 1   a   1  of refrigeration air conditioning, then the value Q 1   a   1  is passed to the air conditioning required energy value calculation unit B 21  and is converted to total required refrigeration air conditioning energy value ΣQ. And the heat source unit controller A 20  based on the comparison of the value ΣQ and the setting value QS controls the heat source unit  21  to supply corresponding heat source to the amount of Qe (also referring to FIG.  3 ). 
     The power value detection unit  2214  detects loading side output power value P and converts to total required refrigeration air conditioning energy values ΣQ and heat source supply amount Qe. According to fan laws, air flow volume F, rotation speed ω, and consuming power P of the air fan motor and refrigeration air conditioning power Q have the following relationship: 
     1. The air flow volume F is directly proportional to the rotation speed ω of the air fan motor (i.e. F and ω are directly proportional with each other). 
     2. The rotation speed ω of the air fan motor is directly proportional to the consuming power P of the air fan motor (i.e. ω and P of the output power at the loading side are directly proportional with each other). 
     3. The refrigeration air conditioning power (i.e. required energy Q for refrigeration air conditioning) is directly proportional to the air flow volume F (i.e. F and Q are directly proportional with each other). 
     4. The refrigeration air conditioning power Q is directly proportional to the motor consuming power value P (i.e. P and Q are directly proportional with each other). 
     The relationship between P and Q set forth above may be further induced to derive the refrigeration air conditioning power Q based on the motor consuming power value P (i.e. Q 1   a   1 , Q 1   a   2 , . . . , Qnan). They have a ΣQ=KP relationship (K is a program conversion coefficient, ΣQ=Q 1   a   1 +Q 1   a   2 + . . . +Qnan, and ΣQ=Qe, therefore Qe=ΣQ=KP). 
     By means of the foregoing construction and based on the total required refrigeration air conditioning energy value ΣQ in the refrigeration air conditioning room R 20  from the heat exchanger unit  22  at the refrigeration air conditioning loading side, the heat source unit controller A 20  may control heat source supply amount Qe of the heat source unit  21  of the refrigeration air conditioning system. The sensor T 21  measures the environmental temperature value Ta of the refrigeration air conditioning room R 20  and the setting value Tas set by the setting unit F 21 . After the processing and comparison done by the central micro processing unit  2211  of the controller  221 , a control signal is output to the output unit  2213  to control the electric power delivering to the air fan motor M 21 . The power value detection unit  2214  detects power value P 1   a   1  output from the output unit  2213  and transfers to the central micro processing unit  2211  which converts to refrigeration air conditioning required energy value Q 1   a   1 . The required energy value Q 1   a   1  is transferred to the air conditioning required energy value calculation unit B 21  which accumulates total required refrigeration air conditioning energy value ΣQ, then the heat source unit controller A 20 , based on the comparison results of the value ΣQ and the setting value QS, controls heat supply amount Qe of the heat source unit  21 . 
     Referring to FIG. 5 for a diagram of a single region configuration system embodiment of the invention, the system  3  consists of a heat source unit  31  coupling with a plurality of heat exchanger units  32 ,  33 ,  34 , . . . at the refrigeration air conditioning loading side to supply heat source to a refrigeration air conditioning region R 30 . The heat exchanger units  32 ,  33 ,  34 , . . . have respectively a controller  321 ,  331 ,  341 , . . . which are same as the one shown in FIG.  3 . The measured power values P 1   a   1 , P 1   a   2 , . . . , P 1   a n are processed and converted to the refrigeration air conditioning required energy values Q 1   a   1 , Q 1   a   2 , . . . , Q 1   a n and are transferred to an air conditioning required energy value calculation unit B 31  to derive the single region air conditioning required energy value QA 1  (QA 1  value is equal to ΣQ under such a condition). Then a heat source unit controller A 30  based on the comparison result of the value QA 1  and the setting value QS controls heat supply amount Qe of the heat source unit  31 . 
     Referring to FIG.6 for a diagram of a multi-region configuration system embodiment of the invention, the system  4  consists of a heat source unit  41  coupling with a plurality of refrigeration air conditioning regions R 41 , R 42 , R 43 , . . . for supplying heat source. Every refrigeration air conditioning region R 41 , R 42 , R 43 , . . . has at least one heat exchanger unit  42 ,  43 ,  44 ,  45 ,  46 ,  47 , . . . at the refrigeration air conditioning loading side. Each heat exchanger unit  42 ,  43 , . . . has a controller  421 ,  431 ,  441 ,  451 ,  461 ,  471 , . . . which is same as the one shown in FIG.  3 . Each controller can convert the measured power values P 1   a   1 , P 1   a   2 , . . . , P 1   a n, P 2   a   1 , . . . , P 2   a n, . . . , Pna 1 , . . . , Pnan to refrigeration air conditioning required energy value Q 1   a   1 , . . . , Q 1   a n, . . . , Q 2   a   1 , . . . , Q 2   a n, Qna 1 , . . . , Qnan, and then transfer respectively to the air conditioning required energy value calculation units B 41 , B 42 , B 43 , . . . of the corresponding refrigeration air conditioning regions R 41 , R 42 , R 43 , . . . to derive the required refrigeration air conditioning energy value A 1 , A 2 , A 3 , . . . of each region, then through the air conditioning required energy value calculation unit B 41  to calculate the total required refrigeration air conditioning energy value ΣQ (ΣQ equals QA 1 +QA 2 + . . . +QAn ). Then a heat source unit controller A 40 , based on the comparison result of the value ΣQ and the setting value QS, controls heat supply amount Qe of the heat source unit  41 . 
     In the aforesaid embodiments, the heat source units  21 ,  31 ,  41 , . . . may be linked to a computer center C to improve operation energy management. The computer center C can monitor and control total refrigeration air conditioning systems and achieve more efficient operation to reach optimal energy resource utilization. 
     FIGS. 7 through 10 illustrate the control methods of the invention, and include the following steps: 
     1. input power values P 1   a   1 , . . . , P 1   a n, . . . , Pnan and convert to refrigeration air conditioning required energy values Q 1   a   1 , Q 1   a   2 , . . . , Qnan, setting value QS, deviation value X; controllers  221  ( 321 ,  331 ,  341 , . . . ,  421 ,  431 ,  441 ,  451 ,  461 , . . . ), based on the detected value P of the power value detection unit  2214 , transfer to the central micro processing unit  2211  for processing and converting to individual refrigeration air conditioning required energy value Q 1   a   1  (Q 2   a   1 , . . . , Q 1   a n, . . . , Qna 1 , . . . , Qnan), then input to the air conditioning required energy value calculation unit B 21  (or B 31 , B 41 ); 
     2. select operation type, based on the configuration, categorize in: 
     (1) single unit operation type (referring to FIGS.  4  and  8 ), the process flow is as follows: 
     I. when ΣQ=Q 1   a   1 , ΣQ&gt;QS+X, total required refrigeration air conditioning energy value ΣQ (i.e. energy requirement) of the heat exchanger unit  22  at the refrigeration air conditioning loading side is greater than the setting value QS and deviation value X, heat source supply amount Qe of the heat source unit  21  controlled by the heat source unit controller A 20  is the maximum value MAX; 
     II. when QS&lt;=ΣQ&lt;=QS+X, heat source supply amount Qe of the heat source unit  21  is maintained a direct proportional relationship with ΣQ value, and an equivalent refrigeration air conditioning power is provided corresponding to the refrigeration air conditioning loading to reach optimum operation efficiency; 
     III. when ΣQ&lt;QS, energy requirement of the heat exchanger unit  22  at the refrigeration air conditioning loading side is lower than the setting value QS, heat source supply amount Q of the heat source unit  21  is a minimum value; 
     (2) Region operation type (referring to FIGS.  5  and  9 ), the process flow is as follows: 
     I. when ΣQ=A 1 =Q 1   a   1 +Q 1   a   2 + . . . +Q 1   a n, ΣQ&gt;QS+X, total required refrigeration air conditioning energy value ΣQ of the refrigeration air conditioning region R 30  (i.e. regional energy requirement) is greater than the setting value QS and deviation value X, heat source supply amount Qe of the heat source unit  31  controlled by the heat source unit controller A 30  is the maximum value MAX; 
     II. when QS&lt;=ΣQ&lt;=QS+X, heat source supply amount Qe of the heat source unit  31  is maintained a direct proportional relationship with ΣQ value, and an equivalent refrigeration air conditioning power is provided corresponding to the refrigeration air conditioning loading to reach optimum operation efficiency; 
     III. when ΣQ&lt;QS, energy requirement of the refrigeration air conditioning region R 30  is lower than the setting value QS, heat source supply amount Qe of the heat source unit  31  is a minimum value; 
     (3) Multi-region operation type (referring to FIGS.  6  and  10 ), the process flow is as follows: 
     I. when ΣQ=QA 1 +QA 2 + . . . +QAn, (refrigeration air conditioning required energy values of various regions are respectively QA 1 =Q 1   a   1 +Q 1   a   2 + . . . +Q 1   a n, QA 2 =Q 2   a   1 +Q 2   a   2 + . . . +Q 2   a n, . . . , QAn=Qna 1  +Qna 2 + . . . +Qnan), and ΣQ &gt;QS+X, total refrigeration air conditioning required energy value ΣQ of all refrigeration air conditioning regions (i.e. total refrigeration air conditioning required energy value of the regions R 41 , R 42 , R 43 , . . . ) is greater than the setting value QS and deviation value X, heat source supply amount Qe of the heat source unit  41  controlled by the heat source unit controller A 40  is the maximum value MAX; 
     II. when QS&lt;=ΣQ&lt;=QS+X, heat source supply amount Qe of the heat source unit  41  is maintained a direct proportional relationship with ΣQ, and an equivalent refrigeration air conditioning power is provided corresponding to the refrigeration air conditioning loading to reach optimum operation efficiency; 
     III. when ΣQ&lt;QS, energy requirement of all refrigeration air conditioning regions is lower than the setting value QS, heat source supply amount Qe of the heat source unit  41  is a minimum value. 
     In summary, the control method of the invention can calculate and derive air conditioning required energy value based on output power value at the refrigeration air conditioning loading side, thereby allowing the heat source unit to generate corresponding heat source supply so that the heat source unit can make dynamic adjustment based on the refrigeration air conditioning required energy value at the loading side. As a result, the system can maintain optimum operation efficiency at any time to achieve the object of saving energy. 
     While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiment thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.