Chiller system

A chiller system includes a compressor that compress refrigerant, a condenser that exchanges heat between the refrigerant and a cooling water discharged from the compressor, and a flow adjusting device that is provided to a refrigerant outlet side of the condenser and adjusts refrigerant amount in the inside of the condenser, the flow adjusting device includes, a main body portion that is communicated with a tubing of the outlet side of the condenser, a refrigerant supply tube that extends to the main body portion from the condenser and supplies the refrigerant in the inside of the condenser to the inside of the main body portion, and a flow hole that is formed on the main body portion and is selectively opened and closed according to refrigerant pressure which is input through the refrigerant supply tube.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2016-0014255, filed on Feb. 4, 2016, whose entire disclosure is hereby incorporated by reference.

BACKGROUND

In general, a chiller (also referred to as a “turbo chiller”) supplies cold water to a cold water demand source, such as an air conditioning system, a computer server farm, factory equipment, laboratory equipment, etc., and the chiller is characterized by cooling the cold water by means of a heat exchange between cold waters circulating between a refrigeration system and the cold water demand source. The chiller is physically large and can be installed in large-scale buildings, such as an office building, factory, laboratory, or the like.

The chiller may include a compressor, an evaporator, a condenser and an expansion valve. The compressor may include an impeller that rotates by a driving force of a driving motor, a shroud in which the impeller is received, and a variable diffuser that converts the kinetic energy of the fluid which is discharged by the rotation of the impeller into pressure energy.

The evaporator and the condenser may have a shell-in-tube structure. Cooling water and cold water (or other fluid) may flow inside the tube, and a refrigerant may be received inside the inner shell.

The cold water may be inputted to and discharged from the evaporator. The heat between the refrigerant and the cold water may be exchanged in the inner portion of the evaporator. The cold water is cooled in the course of passing through the evaporator. In addition, the cooling water may be inputted to and discharged from the condenser. The heat between the refrigerant and the cooling water is exchanged in the inner portion of the condenser. The cooling water is heated in the course of passing through the condenser.

Also, the liquid refrigerant condensed in the inside of the evaporator and the condenser may be maintained at a predetermined required level, and this level of liquid refrigerant may be adjusted through an expansion valve. The liquid refrigerant level may be changed during an initial start-up, during load fluctuations, or when setting temperature variation of the chiller. If the level of the liquid refrigerant in the condenser is not maintained at a constant level, the reliability of the turbo chiller may be decreased. Accordingly, the level of liquid refrigerant in the condenser may be measured, and the level of the liquid refrigerant may be adjusted.

Detecting and adjusting the level of the liquid refrigerant is discussed in Republic of Korea Laid-Open Patent Application No. 10-2014-0048620 (published date: Apr. 24, 2014). In the chiller (turbo chiller) disclosed in the preceding document, a controller directs a plurality of sensors to determine the level of the liquid refrigerant in the condenser, and further controls an expansion valve to adjust the level of the liquid refrigerant in the condenser based on the detected level of the liquid refrigerant. However, since the controller adjusts the expansion valve based on the detected level of the liquid refrigerant, a control stability problem may occur. In addition, the disclosed chiller may have a high manufacturing cost due to the multiple sensors and the complexity of the controller. The above reference is incorporated by reference herein where appropriate for appropriate teachings of additional or alternative details, features and/or technical background.

DETAILED DESCRIPTION OF THE EMBODIMENTS

FIG. 1is a view illustrating a structure of a chiller system according to a first embodiment of the present disclosure, andFIG. 2is a system view illustrating a structure of a chiller module according to a first embodiment of the present disclosure. With reference toFIGS. 1 and 2, a chiller system10according to a first embodiment of the present disclosure may include a chiller module100in which a refrigeration cycle is performed, a cooling tower20that supplies cooling water to the chiller module100, and a cold water demand source30in which cold water, which is heat exchanged with the chiller module100, is circulated. The cold water demand source30may be a device or a building that performs air conditioning using the cold water.

Between the chiller module100and the cooling tower20, a cooling water circulation flow path40may be provided. The cooling water circulation flow path40may include tubing that guides the cooling water between the cooling tower20and a condenser120of the chiller module100. The cooling water circulation flow path40may include a cooling water input flow path42that guides the cooling water to be input to the condenser120and a cooling water output flow path44that guides the cooling water heated at the condenser120to flow out to the cooling tower20.

A cooling pump46driving the flow of the cooling water is provided at least one of the cooling water input flow path42or the cooling water output flow path44. As an example, it is illustrated inFIG. 1that the cooling water pump46is provided in the cooling water input flow path42.

An output water temperature sensor47that detects the temperature of the cooling water input into the cooling tower20may be provided in the cooling water output flow path44. Further, an input water temperature sensor48that detects the temperature of the cooling water discharged from the cooling tower20may be provided in the cooling water input flow path42.

Between the chiller module100and the cold water demand source30, a cold water circulation flow path50may be provided. The cold water circulation flow path50may include tubing that guides the cooling water between the cold water demand source30and an evaporator140of the chiller module100. The cold water circulation flow path50may include a cold water input flow path52that guides the cooling water to the evaporator140, and a cooling water output flow path54that guides the cold water cooled at the evaporator140to the cold water demand source30.

A cooling pump56driving the flow of the cold water is provided at least one of the cold water input flow path52or the cold water output flow path54. As an example, inFIG. 1, the cold water pump56is provided in the cold water input flow path52.

The cooling water demand source30may be a water-cooled air conditioner that exchanges heat between air and the cold water. As an example, the cold water demand source30may include an air handling unit (AHU) that mixes the indoor air with outdoor air and then exchanges heat between the mixed air and the cold water and then discharges the cooled air into the interior; a fan coil unit (FCU) that is installed at the interior and exchanges heat between the indoor air and the cold water and then discharges the heat to the interior; or a floor tubing unit that is embedded in the indoor floor.

FIG. 1is a view illustrating an example of the cold water demand source30that includes an AHU. Specifically, the depicted AHU may include a casing61, a cold water coil62that is installed inside the casing61and in which the cold water is passed, and first and second ventilators63and64that are provided proximate to the cold water coil62. The first ventilator63sucks indoor air and outdoor air inside the casing61, and the second ventilator64discharges air-conditioned air (e.g., air that is cooled through a heat exchange with the cold water within to the cold water coil62) outside of the casing61.

The casing61may include an indoor air sucking portion65, an indoor air discharging portion66, an outdoor air sucking portion67and air-conditioned discharging portion68. When the ventilators63and64are driven, some of the indoor air sucked to the indoor air sucking portion65is discharged back indoors through indoor air discharging portion66, and remaining indoor air that is not discharged to the indoor air discharging portion66is mixed with the outdoor air sucked to the outdoor air sucking portion67and then exchanges heat with the cold water coil62. Then, the mixed air that is heat-exchanged with the cold water coil62(i.e., cooled) may be discharged to the interior through the air-conditioned air discharging portion68.

As shown inFIG. 2, the chiller module100may include a compressor110, the condenser120, an expansion device130(also known as an expansion valve or as a refrigerant metering device (RMD)), and the evaporator140. The compressor110may compress a gaseous form of the refrigerant, which heats the gaseous refrigerant. The condenser120may receive the compressed, high-temperature refrigerant from the compressor110and may perform a heat exchange with the cooling water to cool the refrigerant and convert the refrigerant to a liquid form. The expansion device130restricts the flow of the liquid refrigerant from the condenser120and reduces the pressure to cool the refrigerant as it returns to the gaseous form. The evaporator140that evaporates the reduced-pressure refrigerant received from the expansion device130into a gaseous form and performs a heat exchange between the refrigerant and the cold water to further chill the cold water.

The chiller module100may also include a first tubing101that is provided to the outlet side of the compressor110and guides the refrigerant discharged from the compressor110to the condenser120and a second tubing102that is provided to the outlet side of the condenser120and guides the liquid refrigerant condensed at the condenser120to the expansion device130.

The cooling water input flow path42and the cooling output flow path44may be connected to the condenser120. According to this configuration, the cooling water from chiller100is inputted into the condenser120through the cooling water input flow path42, flows through a cooling water flow path formed in the inside of the condenser120, and then is outputted through the cooling water output flow path44.

The cold water input flow path52and the cold output flow path54may be connected to the evaporator140. According to this configuration, the cold water is inputted into the evaporator through the cold water input flow path52, flows through the cold water flow path formed in the inside of the evaporator140, and then is outputted through the cooling water output flow path54.

In one example, the condenser120and the evaporator140may be configured as a shell-in-tube heat exchange device capable of exchanging heat between the refrigerant and water. For example, a tube may extend within a shell, and the cooling/cold water may flow inside the tube, and a refrigerant may be received inside the shell and outside the tube. Hereinafter, an internal structure of the evaporator120according to one embodiment will be described.

With reference toFIGS. 3 to 6, the condenser120may include a shell121that forms exterior of the condenser120. The condenser120may also include a refrigerant input port122that is formed on one side (or lateral end) of the shell121and in which the gaseous refrigerant compressed at the compressor110is inputted and a refrigerant output port123that is formed at the other side (or other lateral end) of the shell121and at which the liquid refrigerant condensed at the condenser120is outputted.

As shown inFIG. 4, the shell121may be formed in a cylindrical shape, and a center axis of the shell121may be arranged to be perpendicular to a vertical line of the shell. The shell121may be divided into an upper half portion and a lower half portion relative to a horizontal line passing through a center axis of the shell121. In one configuration, widths of the lower half portion and the upper half sections of the shell121may increase toward the horizontal center line and decrease moving away from horizontal center line.

In the example shown inFIGS. 3 and 4, the refrigerant output port123may be provided to the lower half portion of the shell121, and the refrigerant input port122may be provided to the upper half portion of the shell121. According to this configuration, the gaseous refrigerant inputted to the refrigerant input port122in the upper half portion of the shell121, is condensed into a liquid state inside the condenser120, and the liquid refrigerant drawn by gravity into the lower half portion of the shell121to be discharged from condenser120through the refrigerant output port123.

In addition, the condenser120may include a cooling water flow path125that is provided to the inside of the shell121and guides a flow of the cooling water within the condenser120. The condenser120may also include a cooling water input portion127that directs the cooling water to the cooling water flow path125, and a cooling water output portion128that causes the cooling water to be output from the cooling water flow path125. In one example, the cooling water input portion127may be formed on one side end of the shell121, and cooling water output portion128may be formed on the other side end of the shell121. In another example, the cooling water input portion127and cooling water output portion128may be formed on the same lateral end of the shell121. The cooling water input portion127may be connected to the cooling water input flow path42to receive the cooling water, and the cooling water output portion128is connected to the cooling output flow path44to output the cooling water from condenser120.

The gaseous refrigerant inputted inside the shell121(e.g., via the refrigerant input port122) may be condensed into liquid state by exchanging heat with the cooling water flow path125. The liquid refrigerant moves to the refrigerant output port123. For example, gravity may draw the liquid refrigerant to the lower portion of the shell121to be outputted through the refrigerant output port123.

In one implementation, the condenser120may also include a flow rate adjusting device200that is provided near to or within the refrigerant output port123. The flow rate adjusting device200may include a main body portion (or first sleeve)210and an opening and closing member (or second sleeve)220that is received in the main body portion210.

The flow rate adjusting device200functions to maintain the consistent amount the liquid refrigerant (R) within the interior of the condenser120. For example, if an amount of the liquid refrigerant within the condenser120is below a low threshold level, the flow rate adjusting device200may slow or even stop the flow of the liquid refrigerant through the refrigerant output port123. Similarly, if the amount of the liquid refrigerant within the condenser120is above a high threshold level, the flow rate adjusting device200may increase the flow of the liquid refrigerant through the refrigerant output port123.

The flow rate adjusting device200may be fixed to one side of the refrigerant output port123. For example, the refrigerant output port123may be encased by or otherwise shielded by the main body portion210. The inner diameter of the main body portion210may be greater than an outer diameter of the refrigerant output port123, and the refrigerant output port123may be enclosed by the main body portion210. According to this configuration, the refrigerant in the shell121cannot be outputted through the refrigerant output port123without first flowing through the flow rate adjusting device200.

The main body portion210may include at least one flow hole212, and the liquid refrigerant in shell121may flow through the flow hole212to reach the refrigerant output port123. The flow hole212can be selectively opened or closed by the opening and closing member220to control the flow of the liquid refrigerant from the condenser120. When the flow hole212is opened by the opening and closing member220, the liquid refrigerant in the inside of the shell121may flow inside of the main body portion210through the flow hole212and then to the refrigerant output port123. When the flow hole212is closed by the opening and closing member220, the liquid refrigerant cannot reach the refrigerant output port123and the liquid refrigerant remains inside the shell121.

Multiple flow holes212may be provided on the main body portion210. For example, the flow holes212may be formed on a lower (e.g., downward) portion of the main body portion210, and the flow holes212may be separated by a prescribed gap. Each of the flow holes212may have an elongated circular shaped opening, such as an oval or elliptical shaped opening. For example, the flow hole212may be extended in a longitudinal direction of the main body portion210(e.g., an axial direction of the cylinder forming the main body portion210). Since the flow hole212is extended in the longitudinal direction of the main body portion210, the opening area of the flow hole212may gradually increase as the opening and closing member220is raised from a closed position to expose more of the flow hole212. Similarly, the opening area of the flow hole212may be gradually decreased as the opening and closing member220is lowered from an open position. Since the degree that the flow hole212is opened can be adjusted to the movement of the opening and closed member220can adjust, more precise refrigerant flow rate control may be achieved.

The lower end portion of the main body portion210may be in fluid communication with the second tubing102. For example, the liquid refrigerant inputted into the main body portion210through the flow hole212may be move through the second tubing102to the expansion device130.

A main body portion cover (or cap)216may be provided in an upper side (e.g., opposite the flow hole212) of the main body portion210. The main body portion cover216shields an opening on the upper end portion of the main body portion210so that the liquid refrigerant cannot enter the main body portion210through the opening and, instead, can only enter the main body portion210through the flow hole212. The main body portion cover216may be separately coupled to the main body portion210(e.g., the main body portion cover216may be screwed on to the main body portion210) or the body portion cover216may be integrally formed with the main body portion210or may be permanently affixed to (e.g., welded on) the main body portion210.

As previously described, the main body portion210may have a substantially cylindrical shape or other shape having a central cavity. The opening and closing member220is received in the main body portion210. For example, an outer peripheral surface of the opening and closing member220may be in contact with an inner peripheral surface of the main body portion210such that the liquid refrigerant cannot flow in gap between the main body portion210and the opening and closing member220. For example, the outer peripheral surface of the opening and closing member220may have shape that corresponds to the inner peripheral surface of the main body portion210. A central axis of the opening and closing member220and a central axis of the main body portion210may be arranged to match each other.

An upper and lower distal ends of the opening and closing member220may include openings. An opening and closing member cover (or cap)226may be provided in the upper distal end of the opening and closing member220. The opening and closing cover226may cover the opening at the upper distal end of the opening and closing portion220. Consequently, the liquid refrigerant may enter or exit the opening and closing member220through the opening in the lower distal end, but may not enter or exit the opening in the upper distal end of the opening and closing member220. The main body portion cover226may be separately coupled to the opening and closing member220or may be integrally formed with or permanently attached (e.g., welded) to the opening and closing member220.

The opening and closing member220may move in a sliding manner within the main body portion210. A length of the opening and closing member220may be relatively shorter than a length of the main body portion210. When the opening and closing member220slides down (e.g., toward the refrigerant output port123), a portion of the opening and closing member220may completely overlap the flow hole212to close the flow hole212and prevent the flow of the refrigerant through the flow holes212. On the other, when the opening and closing member220slides up, the opening and closing member220exposes at least a portion of the flow hole212. The exposed portion of flow holes212allows the refrigerant to enter the main body portion210. In this way, the opening and closing member220may be selectively moved up or down to control the flow of refrigerant through the flow holes212of the main body portion210.

The flow adjusting device200may include a connecting pin230that passes through a main body portion210, and an opening and closing member220. A guide portion (or opening)214may be formed in the main body portion210, and a through hole224may be formed in the opening and closing member220. The connecting pin230may pass through guide portion214and may be inserted in the through hole224.

As shown inFIG. 5, the guide portion214may extended a predetermined length along the longitudinal direction of the main body portion210. For example, the guide portion214may have an upper end portion and a lower end portion of the guide portion214. In one configuration, the guide portion214may have an elongated circular shape that is similar to the shape of the flow hole212.

As previously described, the connecting pin230may be inserted through the guide portion214and into the through hole224. The connecting pin230may move in the guide portion214to guide the movement of the opening and closing member220. Also, the movement of the connecting pin230within the guide portion214may restrict the moving range of the opening and closing member220.

In one implementation, a withdrawal prevention portion (not shown) for preventing the connecting pin230from withdrawing from the main body portion210and the opening and closing member220may be provided in the connecting pin230. For example, the connecting pin230may include a threaded end that is inserted into the guide portion214and the through hole224, and a nut (or other connection mechanism) may be attached to the threaded end to prevent the connecting pin230from being removed from the guide portion214and the through hole224.

For example, when the opening and closing member220is raised to open the flow hole212, the connecting pin230may interface with an upper portion of the guide portion214to limit the range that opening and closing member220can be raised. Similarly, when the opening and closing member220is lowered to close the flow hole212, the connecting pin230may interface with a lower portion of the guide portion214to limit the range that opening and closing member220can be lowered. Furthermore, the connecting pin230may interface with side portions of the guide portion214to limit a rotation of the opening and closing member220within the main body portion.

The through hole224formed on the side of the opening and closing member220may have a size that corresponds to the connecting pin230. According to this, the connecting pin230may be inserted into the through hole224to be affixed to the opening and closing member220. When assembling the flow adjusting device200, the opening and closing member220may inserted into the main body portion210, and then the connecting pin230pass through the guide portion214and into the through hole224. The opening and closing member cover226is coupled to the opening and closing member220, and the main body cover216is coupled to the main body portion210.

Although a single connecting pin230and a single pair of the guide portion214and the through hole224are depicted inFIG. 5, it should be appreciated that the flow rate adjustment device may include two or more pairs of the guide portions214and the through holes224. In one example, pairs of the guide portions214and the through holes224may be provided at different vertical positions in the main body portion210and the opening and closing member220, and different connecting pin230may be inserted into each pair of the guide portions214and the through holes224. In another example, pairs of the guide portions214and the through holes224may be positioned at different radial portions but at the same height in the main body portion210and the opening and closing member220. For instance, the pair of the guide holes224may be disposed so that an imaginary line that connects to the centers of the through holes224intersects with the center axis of the opening and closing member220. According to this, a single connecting pin230may be inserted the through pairs of the guide portions214and the through holes224to intersect the center axis of the opening and closing member210.

In an example shown inFIGS. 4 and 6-8, the flow adjusting device200may further include a refrigerant supply tube129that supplies the refrigerant from the inside of the condenser120(e.g., within shell121) to cavity within the main body portion210. One end (a first end)129aof the refrigerant supply tube129may be inserted through the opening and closing member220and into the cavity of the main body portion210, and another end (a second end)129bof the refrigerant supply tube129may be connected to the shell121of the condenser120. For example, the other end129bof the refrigerant supply tube129may be connected to the lower half portion of the shell121such that gravity pulls some of the refrigerant from the shell121to the cavity of the main body portion210. In the example, shown inFIG. 4in which the shell121has a cylindrical shape, the width of the shell121may increase away from the flow adjusting device200and toward the horizontal middle of the shell121. In this configuration, the liquid refrigerant is collected to the upper side of the other end129bof the refrigerant supply tube129and then may be input to the other end129aof the refrigerant supply tube129. Thus, the liquid refrigerant in the inside of the shell121may be carried by the refrigerant supply tube129to the internal cavity of the main body portion210and to the flow rate adjustment device.

The liquid refrigerant in the inside of the condenser120may be selectively inputted to the refrigerant supply tube129according to the level of liquid refrigerant within the shell, and according to this selectively movement of the fluid refrigerant through the refrigerant supply tube129, the flow adjusting device200may be operated. The operating principle of the flow adjusting device is now described with respect toFIGS. 7 and 8.

FIG. 7is a view illustrating a case where a liquid refrigerant is at a desired level within the condenser120, andFIG. 8is a view illustrating a case where the quantity of the liquid refrigerant in the condenser120exceeds the desired level. With reference toFIGS. 7 and 8, the flow adjusting device200closes to prevent the liquid refrigerant from moving to the second tubing102when a level (or height (H)) of the liquid refrigerant in the the shell121of the condenser120is lower than or equal to a predetermined level and opens to allow some of the liquid refrigerant to move to the second tubing102when the level (H) is higher than or equal to the predetermined level. As used herein, the level (H) of the liquid refrigerant may refer to a height of the liquid refrigerant collected in the inside of the shell121. For example, the level (H) may refer to the vertical distance from an opening of the refrigerant output port123to an upper surface of the liquid refrigerant within the shell121.

As previously described, the first end129aof the liquid supply tube129may be inserted inside the opening and closing member220, and the second end129bof the liquid supply tube129may be inserted inside the shell121. Some of the refrigerant in the inside of the shell121may be transported to the opening and closing member220through the refrigerant supply tube129. For example, when the height H of the liquid refrigerant in the inside of the shell121is lower than the other end129bof the refrigerant supply tube129(i.e., the other end129bis above the fluid refrigerant), gaseous refrigerant in the shell121may be transported inside of the opening and closing member220through the refrigerant supply tube129. The internal pressure applied to the opening and closing member220(e.g., via the gaseous refrigerant) is smaller than the weight of the opening and closing member220, and the opening and closing member220is lowered. The lowered opening and closing member220blocks the flow hole212to prevent the liquid refrigerant from exiting the shell121. While the flow hole212is closed, more liquid refrigerant is collected in the shell121, and thus, the level H of the liquid refrigerant increases.

When the level H of the liquid refrigerant sufficiently increases to be higher than the other end129bof the refrigerant supply tube129, liquid refrigerant from the shell121is transported to the inside of the opening and closing member220through the liquid supply tube129b. The liquid refrigerant injected by the liquid supply tube129provide sufficient pressure (P) against the opening and closing member cover226to raise the opening and closing member220. When the opening and closing member220is raised sufficiently to expose a portion of the flow hole212, the exposed portion of the flow hole212allows the liquid refrigerant to leave the condenser120via the refrigerant output port123.

The pressure of the liquid refrigerant that is injected through the refrigerant supply tube129may increase as the level H of the liquid refrigerant in the shell121increases. Thus, increased pressure (P) may be applied to the opening and closing member220as the height H of the liquid refrigerant in the shell121increases, and the opening and closing member220may be raised more based on the increased pressure. Similarly, less pressure (P) may be applied to the opening and closing member220when the height H of the liquid refrigerant in the shell121decreases, and the opening and closing member220may be lowered due to the decreased pressure.

Since the flow hole212has an elongated circular shape, the extent that the flow hole212is open may be adjusted according to the height that the opening and closing member220. Accordingly, the flow hole212opens more as the amount of the liquid refrigerant in the inside of the shell121is increased, the discharging rate of the liquid refrigerant through the flow adjusting device200is increased to correspond to increasing amount of the liquid refrigerant in the shell121.

The opened flow holes212allows more liquid refrigerant to leave the condenser120. As more of the liquid refrigerant in the inside of the shell121is moved to the expansion device130through the second tubing102, the water level H of the liquid refrigerant in the inside of the shell121is reduced. When the level H of the liquid refrigerant is reduced and the pressure P applied by the refrigerant supply tube129against the opening and closing member220is reduced, and the opening and closing member220again is lowered and to at least partially close the flow hole212and slow the flow of the liquid refrigerant from the condenser120.

Consequently, the flow adjusting device200may be adjusted so that the level H of the liquid refrigerant inside the shell121is maintained near the height of the end129bof the refrigerant supply tube129. The level H of the liquid refrigerant maintained in the shell121may be changed by adjusting the height of the end129bwithin the condenser120.

Thus, the level of the liquid refrigerant in the inside of the condenser is maintained at a predetermined height by the flow adjusting device. Also, the chiller system of the present disclosure can solve control stability problem since the chiller system of the present disclosure does not use electronic devices, such as a sensor and a control unit for the refrigerant flow rate control.

In addition, it is possible to more accurate refrigerant flow rate control by the flow hole that is formed in the flow adjusting device having the long hole shape. In addition, the opening and closing member may be stably operated by providing the guide portion that guides movement of the opening and closing member to flow adjusting device.

A chiller system having a flow adjusting device that is constantly capable of maintaining a level of the liquid refrigerant of a condenser through a mechanical method is provided. In the provided chiller system, the flow adjusting device is operated in a stable manner. The liquid refrigerant discharging rate of the flow adjusting device may be adjusted to correspond to the increasing rate of the liquid refrigerant in the inside of the condenser for constantly maintaining the level of the liquid refrigerant of the condenser.

In order to constantly maintain the level of the liquid refrigerant of the condenser through a mechanical method, the chiller system of the present disclosure may include a flow adjusting device that is provided to a refrigerant output port side of the condenser, and the flow adjusting device has a flow hole in which refrigerant is selectively input, and the flow hole is communicated with tubing of the condenser outlet side, and the condenser has a refrigerant supply tube that one end thereof is inserted into the inside of the flow adjusting device and the other end thereof is connected to one point of the condenser, and thus the liquid refrigerant in the inside of the condenser according to height of the liquid refrigerant collected in the condenser is selectively input to the flow adjusting device through the refrigerant supply tube and the amount of the liquid refrigerant in the inside of the condenser is adjusted by selectively opening and closing the flow hole according to the pressure of the liquid refrigerant input through the refrigerant supply tube.

In order to reliably operate the flow adjusting device, the flow adjusting device may include a connecting pin that passes through the main body portion and the opening and the closing member in turn, the connecting pin is fixed to the opening and closing member and is relatively moved to the main body portion, the guide portion into which the connecting pin is inserted is formed in the main body portion, and the guide portion has a long hole shape that extends according to longitudinal direction of the main body portion. In order to adjust the discharging rate of the liquid refrigerant to correspond to the increasing rate of the liquid refrigerant in the inside of condenser, the flow hole has a long hole shape that extends according to longitudinal direction of the main body portion,