KR102329432B1 - Hybrid adsorption chiller having super colling chain with renewable energy and method for operating the same - Google Patents

Abstract

According to the present invention, a hybrid adsorption chiller using renewable energy comprises: geothermal cooling unit; an adsorption unit having at least two adsorption towers, an adsorption vaporizer, and an adsorption condenser; and an electric compression type unit having a vaporizer, a compressor, a condenser, and an expansion valve. The adsorption vaporizer of the adsorption unit supplies cold water to the condenser of the electric compression type unit to supercool a refrigerant compressed in the compressor.

Description

Hybrid adsorption chiller using renewable energy with supercooling linkage and its driving method {HYBRID ADSORPTION CHILLER HAVING SUPER COLLING CHAIN WITH RENEWABLE ENERGY AND METHOD FOR OPERATING THE SAME}

The present invention relates to a hybrid adsorption chiller utilizing renewable energy having a supercooling linkage and a driving method thereof, and more particularly, a hybrid adsorption chiller utilizing renewable energy having a supercooling linkage and driving the adsorption chiller by effectively combining an adsorption chiller and an electrocompression chiller and driving method thereof It's about how to drive.

Adsorption chillers generally consist of a condenser at the top, an evaporator at the bottom and two or more adsorption towers in the middle. In general, a plurality of steam valves and water line valves are installed between the first and second adsorption towers, the evaporator, and the condenser, which are configured as a pair, and the first and second adsorption towers operate alternately between adsorption and desorption, respectively. have and drive

The principle of operation of adsorption cooling is as follows. First, in the adsorption cycle performed in one adsorption tower, the cold water used for adsorption cooling passes through the heat transfer tube of the evaporator and is cooled while losing heat by the latent heat of evaporation of the refrigerant. The refrigerant vapor generated at this time flows into the adsorption tower driven by the adsorption cycle, and is absorbed by the adsorbent coated on the surface of the adsorption tower. The absorbed heat generated at this time is removed by the cooling water flowing in the tube of the adsorption tower, and the pressure inside the adsorption tower is kept constant at 5 to 10 mmHg, so that the refrigerant evaporating action of the evaporator is continuously performed.

On the other hand, the adsorption tower is installed with a capacity that can sustain the adsorption cycle for about 5 to 10 minutes, so that the adsorption tower where the adsorption cycle is completed is converted to a desorption cycle, and the adsorption tower where the desorption cycle is completed is converted to an adsorption cycle every 5 to 10 minutes.

At the end of the adsorption cycle, the adsorption tower that has absorbed the refrigerant vapor to the maximum value proceeds with a desorption cycle. At this time, it is heated by hot water of about 70° C. or less supplied to the tube inside the adsorption tower to generate refrigerant vapor. At this time, the generated refrigerant vapor flows into the condenser, is liquefied by the cooling water circulated inside the condenser heat transfer tube, and circulates to the evaporator.

At least two or more adsorption towers are installed, and when one adsorption tower is operated in an adsorption cycle, the other adsorption tower is operated in a desorption cycle, and alternately, adsorption and desorption cycles are operated.

At this time, the adsorption towers used in the first adsorption tower and the second adsorption tower are made by coating an adsorbent on a heat exchanger, and the adsorbent used is an adsorbent using silica gel, zeolite, organic-inorganic hybrid (MOF), or the like.

These adsorption types have differences in performance and efficiency depending on the adsorbent, but in general, the COP (Coefficient of Performance, cooling efficiency) is in the range of 0.4 to 0.6. It is known that the COP decreases even more when producing chilled water with a temperature of 7 degrees, which is the domestic standard cooling condition. In addition, it has been pointed out as disadvantages that the volume of the adsorption tower is large, the price is high, and the cooling water pump and the cooling tower are large due to low efficiency.

The present invention has been devised to solve the above problems, and an object to be solved in the present invention is to provide a hybrid adsorption refrigerator having a supercooling linkage. This is a refrigerator by designing a hybrid adsorption cycle that combines an adsorption unit and an electrocompression unit. At a low load or partial load of less than 40~60%, it is driven only by hot water to produce cold water, and at a high load of 40~60% or more, an adsorption type It relates to the configuration of an adsorption chiller in which the cycle is automatically converted to apply the cooling heat produced in the unit as the cooling water of the compression cycle. In particular, a hybrid adsorption refrigerator utilizing renewable energy that can effectively utilize energy as a method of utilizing renewable energy including geothermal heat or solar heat is provided.

In addition, the problem to be solved in the present invention is to provide a hybrid adsorption refrigerator having a supercooling linkage. This is a refrigerator by designing a hybrid adsorption cycle that combines an adsorption type unit and an electrocompression unit. At a partial load of 40 to 60% or less, low temperature water of 70°C or less is used, and at a high load of 40 to 60% or more, additional electricity is used. It relates to the construction of a hybrid adsorption chiller having a dual condenser using energy. In addition, a method of using renewable energy including geothermal heat or solar heat, which can effectively utilize energy, provides a driving method of a hybrid adsorption refrigerator using renewable energy.

The hybrid adsorption refrigerator provided in the present invention is an adsorption unit unit comprising a geothermal cooling unit 20, at least two or more adsorption towers 3 and 4, an adsorption evaporator 1, an adsorption condenser 2, an evaporator 5, It includes an electro-compression unit part including a compressor (8), a condenser (6) and an expansion valve (9), and the adsorption-type evaporator (1) of the adsorption type unit part supplies cold water to the condenser (6) of the electro-compression type unit part, It is characterized in that the refrigerant compressed in the compressor (8) is supercooled.

In one embodiment, it may further include a renewable energy heat source supply unit 30 for selectively applying the hot water generated by solar heat and the externally supplied hot water to the adsorption towers (3, 4).

In one embodiment, the cooling water main pipes 110 and 120 for transferring the cooling water between the geothermal cooling unit 20 and the adsorption type condenser 2 , the cooling water inlet branch pipe 140 branched from the cooling water main pipe 110 , the cooling water A cooling water supply pipe 210 that delivers cold water from the inlet branch pipe 140 to the adsorption type evaporator 1, is installed between the adsorption type evaporator 1 of the adsorption unit unit and the condenser 6 of the electrocompression unit unit, the adsorption type evaporator ( A cooling outlet pipe 220 that supplies the chilled water cooled in 1) to the condenser 6, and a compressed cooling water branch pipe that delivers coolant from the condenser 6 to the geothermal cooling unit 20 through the coolant main pipe 120 (130), it may be characterized by further comprising a cooling control valve (V12) for controlling the cold water between the adsorption type evaporator (1) and the condenser (6).

In one embodiment, the cold water main inlet pipe 170 and the cold water main outlet pipe 160, the cooling outlet pipe 220 and the cold water main outlet pipe 160 for delivering cold water to the load side 31, 32, 33 are connected. The adsorption type cold water outlet pipe 180 connecting It may be characterized in that it further comprises a compressed cooling water three-way control valve (V11) for controlling the flow of the cold water in the adsorption type cold water inlet pipe (190).

In one embodiment, the compressed cold water inlet pipe 150 connecting the evaporator 5 and the cold water main inlet pipe 170, and the compressed cold water outlet pipe connecting the evaporator 5 and the cold water main outlet pipe 160 200, the cold water inlet three-way control valve (V9) for controlling the flow of cold water between the compressed cold water outlet pipe 200, the adsorption cold water outlet pipe 180 and the cold water main outlet pipe 160, the compressed cold water inlet The cold water outlet three-way control valve (V10) for controlling the flow of cold water between the pipe 150, the adsorption type cold water inlet pipe 190 and the cold water main inlet pipe 170, the cold water passing through the cold water main outlet pipe 160 Further comprising a cold water outlet temperature sensor (S1) for measuring the temperature and a cold water inlet temperature sensor (S2) for measuring the temperature of the cold water passing through the cold water main inlet pipe (170), the cold water outlet temperature sensor (S1) and the cold water inlet The compressed cooling water three-way control valve (V11), the cold water outlet three-way control valve (V9), and the cold water inlet three-way control valve (V10) are controlled according to the temperature difference of the cold water measured by the temperature sensor (S2). can

The driving method of the hybrid adsorption refrigerator provided in the present invention includes at least two or more adsorption towers (3, 4), an adsorption type evaporator (1), an adsorption unit unit including an adsorption type condenser (2), an evaporator (5), a compressor (8) , an electro-compression unit including a condenser (6) and an expansion valve (9), a hybrid adsorption chiller including a geothermal cooling unit (20), the entire driving stage in which the adsorption unit and the electro-compression unit are simultaneously driven (S100), and in the simultaneous driving step, the adsorption type evaporator 1 of the adsorption unit unit supplies cold water to the condenser 6 of the electrocompression unit unit, and supercools the refrigerant compressed in the compressor 8. do.

In one embodiment, it may be characterized in that it further comprises a renewable energy hot water supply unit 30 for selectively applying the hot water generated by solar heat and the externally supplied hot water to the adsorption towers (3, 4).

In one embodiment, the load measuring step of measuring the chiller load by measuring the cold water outlet temperature supplied to the load side (31, 32, 33) and the cold water inlet temperature recovered from the load side (31, 32, 33) (S200) and When it is determined that the partial load state in the load measurement step (S200), it may be characterized in that it further comprises a partial driving step (S300) of stopping the electrocompression unit and driving only the adsorption unit unit.

In one embodiment, the partial load state of the partial driving step (S300) is a state in which the difference between the cold water inlet temperature and the cold water outlet temperature measured in the load measuring step (S200) is within 2 to 3 degrees Celsius. can

In one embodiment, when an upward trend of the cold water inlet temperature or the cold water outlet temperature is confirmed in the load measurement step ( S200 ), it may be characterized in that the entire driving step ( S100 ) is switched.

The hybrid adsorption refrigerator having a supercooling linkage according to the present invention and a driving method thereof efficiently utilize an unused low-temperature heat source corresponding to hot water below 70 ° C. In particular, by adding a cooling unit using geothermal heat, more efficient energy use is possible.

When only an adsorption chiller is applied for large-capacity cooling, the size of the adsorption unit increases significantly and the price rises. have. Accordingly, by driving the adsorption chiller in a hybrid method combining the adsorption unit and the electrocompression unit, it is possible to effectively distribute and drive the adsorption chiller according to the degree of load.

In particular, in order to improve the efficiency of the hybrid adsorption chiller, maximize the utilization of low-temperature heat sources, and minimize power, only the single cycle of the adsorption unit is driven at a partial load of less than 40 to 60%, and the cold water produced by the adsorption evaporator is supplied to the cooling demand for cooling. At a high load of 40 to 60% or more, the hybrid cycle is driven by simultaneous operation of the adsorption type unit and the compression type unit, enabling effective partial load driving beyond simple inverter control.

In particular, the cold water produced by the adsorption type evaporator is supplied to the condenser of the compression type unit to increase the degree of subcooling of the compression type refrigeration cycle and reduce the condensing pressure, thereby minimizing the power of the compression type and improving the cooling capacity. Electrical compression cycles may be enabled.

In addition, more effective energy utilization is possible by selectively providing a hot water heat source applied to an adsorption cycle by utilizing solar energy and district heating.

1 is a block diagram of a hybrid adsorption refrigerator according to an embodiment of the present invention.
FIG. 2 is a flowchart of a method for driving a hybrid adsorption refrigerator according to the embodiment of FIG. 1 .
FIG. 3A is a configuration diagram showing the overall operation of the hybrid adsorption refrigerator according to the embodiment of FIG. 1 .
FIG. 3B is a configuration diagram illustrating partial driving of the hybrid adsorption refrigerator according to the embodiment of FIG. 1 .
4 is a block diagram of a hybrid adsorption refrigerator according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

The terminology used in the present application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that a feature, step, element or a combination thereof described in the specification exists, but one or more other features, steps, element or It should be understood that it does not preclude the possibility of the existence or addition of combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Dual configuration of hybrid adsorption chillers

1 is a block diagram of a hybrid adsorption refrigerator according to an embodiment of the present invention.

Referring to FIG. 1 , the hybrid adsorption refrigerator 1000 of this embodiment is divided into an adsorption unit unit and an electrocompression unit unit. At this time, the adsorption unit unit and the electrocompression unit unit may be used by sharing the geothermal cooling unit 20, or may have various cooling units including a cooling tower. In this embodiment, it will be described that the geothermal cooling unit 20 is shared.

The adsorption type unit includes an adsorption type evaporator (1), an adsorption type condenser (2), a first adsorption tower (4), and a second adsorption tower (3). In addition, the compression type unit includes an evaporator (5), a condenser (6), a compressor (8), and an expansion valve (9). In each device, cold water line piping, cooling water line piping, hot water line piping, various automatic control valves, temperature sensors of each part, and cooling heat source circulation pump between adsorption type and compression type are added. In addition, the cold water pump 102, the cooling water pump 103, the geothermal cooling unit 20, and loads 31, 32, 33 such as an FCU or an air conditioner are configured as an external cooling system.

Looking at the detailed configuration of the adsorption chiller 1000 according to this embodiment, the first adsorption tower 4 includes a first control valve V1 for controlling a hot water inlet pipe for supplying hot water to the first adsorption tower, and cooling water to the first adsorption tower. A second control valve (V2) for controlling the coolant inlet pipe supplying and a fourth control valve (V4) for controlling the pipe.

Similarly, the second adsorption tower 3 includes a fifth control valve V5 for controlling a hot water inlet pipe for supplying hot water to the second adsorption tower, and a sixth control valve for controlling a cooling water inlet pipe for supplying cooling water to the second adsorption tower ( V6), a seventh control valve (V7) for controlling the hot water outlet pipe for discharging the hot water provided from the second adsorption tower, and an eighth control valve (V8) for controlling the cooling water outlet pipe for discharging the cooling water to the second adsorption tower .

When the first adsorption tower is driven in the adsorption cycle, the first control valve V1 and the third control valve V3 are closed, and the second and fourth control valves V2 and V4 are opened, and cooling water is supplied. At the same time, when the second adsorption tower is driven in the desorption cycle, the fifth and seventh control valves V5 and V7 are opened, and the sixth and eighth control valves V6 and V8 are closed, and hot water is supplied. When the first and second adsorption towers 4 and 3 are driven in opposite cycles, each control valve is controlled under opposite conditions. Accordingly, the first adsorption tower and the second adsorption tower (4, 3) can be driven by being replaced by an adsorption and desorption cycle alternately.

In this embodiment, a pair of adsorption towers are provided, but in some cases, the three adsorption towers may be driven alternately, and it is also possible to apply several pairs of adsorption towers, respectively.

As described above, the adsorption unit is composed of first and second adsorption towers 4 and 3 , an adsorption evaporator 1 , an adsorption condenser 2 and a geothermal cooling unit 20 . The first and second adsorption towers (4, 3) are configured to alternately transfer piping between the adsorption condenser (2) and the adsorption type evaporator (1), and cooling water is transferred between the adsorption condenser (2) and the geothermal cooling unit (20) The cooling water main pipes 110 and 120 are configured. In addition, the adsorption type evaporator 1 is connected to the cold water main outlet pipe 160 and the cold water main inlet pipe 170 for supplying cold water to the cooling loads 31 , 32 , and 33 to supply cold water.

Specifically, the adsorption type evaporator 1 transfers the cooled cold water to the adsorption type cold water outlet pipe 180 connected to the cold water main outlet pipe 160 through the cooling outlet pipe 220 . Accordingly, the cold water is supplied to the cooling loads 31 , 32 , 33 through the main outlet pipe 160 . The supplied cold water is again discharged to the cold water main inlet pipe 170 , passes through the adsorption type cold water inlet pipe 190 , and is returned to the adsorption type evaporator 1 through the cooling water supply pipe 210 . This completes the single refrigeration cycle of the adsorption unit.

On the other hand, the electric compression type unit is configured to include an evaporator (5), a compressor (8), a condenser (6) and an expansion valve (9). In this embodiment, a single condenser (6) system is adopted, and the condenser (6) receives cold water from the adsorption type evaporator (1), and serves to condense and liquefy and supercool the refrigerant compressed in the compressor (8).

The condenser 6 receives the cold water cooled in the adsorption type evaporator 1 through the cooling outlet pipe 220 . Thereafter, the cold water passing through the condenser 6 is again transferred to the geothermal cooling unit 20 through the compressed cooling water branch pipe 130 . In addition, the cold water cooled in the evaporator 5 is supplied to the cooling loads 31, 32, 33 through the compressed cold water outlet pipe 200 connected to the cold water main outlet pipe 160, and again the cold water main inlet pipe 170. It is recovered to the evaporator 5 through the compressed cold water outlet pipe 150 connecting the This completes the individual refrigeration cycle of the electric compression unit.

In this embodiment, the cooling tower is not applied for cooling, but the geothermal cooling unit 20 is used. The geothermal cooling unit 20 uses a method of cooling by circulating cold water or cooling water in a buried pipe. In addition to being buried underground, geothermal cooling units can be located in a variety of environments, including ponds, lakes, reservoirs, or other water bodies such as oceans.

The geothermal cooling unit 20 applied in this embodiment includes a main control valve V15 and an underground heat exchange control valve V16. In a buried pipe buried underground, cold water or cooling water must pass underground for a longer period of time in order to increase the contact area with geothermal heat. In some cases, this may be applied unnecessarily.

In the embodiment, this is controlled by the underground heat exchange control valve (V16). When the load is high, the entire unit is driven, and when the amount of heat exchange is large, the underground heat exchange control valve V16 controls the flow path to have a larger exchange length. In addition, when the amount of heat exchange is small due to partial driving, the underground heat exchange control valve V16 controls the flow path to have a shorter exchange length. This can quickly control unnecessary geothermal exchange by controlling the movement length of the cooling target in the pipe where heat exchange occurs.

How to drive a hybrid adsorption chiller

FIG. 2 is a flowchart of a method for driving a hybrid adsorption refrigerator according to the embodiment of FIG. 1 .

Referring to FIG. 2 , the method for driving an adsorption refrigerator according to the present embodiment includes a full driving step ( S100 ), a load measuring step ( S200 ), and a partial driving step ( S300 ). In addition, it may further include a supercooling prevention step to be described later.

In the entire driving step (S100), the adsorption type unit unit and the electrocompression type unit unit are simultaneously driven, thereby driving with rapid cooling performance and large cooling capacity.

A load measurement step (S200) of measuring the degree of the cooling load is performed between each driving step.

In the load measurement step (S200), the chiller load is measured by measuring the outlet temperature of the cold water supplied to the load sides (31, 32, 33) and the inlet temperature of the cold water recovered from the load sides (31, 32, 33). Using the cold water inlet temperature and the cold water outlet temperature, it is determined whether it is a partial load (S210), and the entire driving step (S100) is switched to the partial driving step (S300).

When the rising trend of the cold water inlet temperature or the cold water outlet temperature is confirmed in the load measurement step S200 (S220), the partial driving step S300 is switched back to the full driving step S100. While doing this repeatedly, effective cooling is driven.

Full drive of hybrid adsorption chiller (S100)

FIG. 3A is a configuration diagram showing the overall operation of the hybrid adsorption refrigerator according to the embodiment of FIG. 1 . With reference to FIG. 3A , the overall operation of the hybrid adsorption refrigerator 1000 according to the present embodiment will be described.

When the hybrid adsorption refrigerator according to the present embodiment is cooled, it is driven in a hybrid adsorption cycle in order to achieve a rapid cooling effect on the load side of the room. Therefore, both the adsorption type unit part and the electrocompression type unit part are driven.

In more detail, when the first cooling operation command of the system is started, it is driven in the entire driving step ( S100 ), and the cold water pump 102 and the cooling water pump 103 are started. The cold water inlet three-way control valve (V9) installed on the cold water main outlet pipe 160 and the cold water outlet three-way control valve (V10) installed on the cold water main inlet pipe 170 connect the cold water flow path to the compression evaporator (5). The cold water circulated from the load side of the room flows into the compression type evaporator (5).

On the other hand, the compressed cooling water three-way control valve (V11) is connected to the adsorption type cold water inlet pipe (190) so that cold water is supplied through the cooling water supply pipe (210) connected to the adsorption type evaporator (1) branched to the cooling water main pipe (140). side is closed, and the cooling water main pipe 140 and the cooling water supply pipe 210 are opened. The chilled water cooled through the adsorption evaporator 1 is circulated in the geothermal cooling unit by opening the cooling control valve V12 installed in the cooling outlet pipe 220 connected between the adsorption evaporator 1 and the compression condenser 6 A flow path is formed through which the cold water flows. The cooling water flowing into the adsorption type evaporator 1 through this flow path is cooled by the latent heat of evaporation and then circulated to the compression type condenser 6 to condense and liquefy the refrigerant vapor flowing into the high temperature and high pressure by the electric work in the compressor 8. and supercooling.

In this process, both the adsorption unit unit and the electrocompression unit unit are driven. First, when the adsorption unit unit is described, the cooling water flows into the adsorption tower in which the adsorption process is performed among the first and second adsorption towers 3 and 4 of the adsorption unit unit, Hot water flows into the adsorption tower in which the desorption process is performed, and the adsorption tower in the adsorption process communicates with the adsorption evaporator (1), and a cooling effect occurs in the adsorption evaporator (1), and the adsorption tower in the desorption process communicates with the adsorption condenser (2). An adsorption type refrigeration cycle in which refrigerant vapor is condensed and recirculated to the adsorption tower evaporator (1) is implemented.

At this time, cold water of intermediate temperature generated by the cooling effect in the adsorption type evaporator 1 flows into the condenser 6 of the electrocompression unit part along the cooling outlet pipe 220, and the compressed refrigerant compressed in the compressor 8 is removed. It is condensed and supercooled, and the temperature is raised and circulated to the cooling tower 20 again. The intermediate temperature cold water preferably corresponds to about 18 to 28 °C. At this time, the compressed cooling water three-way control valve V11 closes the adsorption type cold water inlet pipe 190 side, and opens the cooling water main pipe 140 and the cooling water supply pipe 210 to remove the cold water used in the condenser 6 . It is transmitted to the cooling tower (20).

On the other hand, the compressor (8) of the compression type unit compresses the refrigerant vapor and circulates the refrigerant in the high-pressure vapor state to the condenser (6). 5) and produces cold water by latent heat of evaporation.

At this time, if necessary, the amount of heat exchange of the geothermal cooling unit 20 is controlled. The underground heat exchange control valve V16 of the geothermal cooling unit 20 controls the flow path to have a larger exchange length. Buried pipes buried underground allow cold water or cooling water to pass through the ground for a longer period of time to increase the contact area with geothermal heat.

In order to more actively control the underground heat exchange control valve (V16) of the geothermal cooling unit, a temperature sensor is installed at each point of the geothermal cooling unit 20 so that heat exchange with the geothermal heat is performed at the entrance of the inner tube of the geothermal cooling unit 20. In the case where all of them are already performed, the underground heat exchange control valve V16 controls the flow path to be short, and when heat exchange with the geothermal heat is not performed well even at the entrance of the inner pipe of the geothermal cooling unit 20, the underground heat exchange control valve V16 can be separately controlled to make the flow path long.

In particular, since the condenser 6 of the electro-compression unit part undergoes a supercooling process due to this hybrid adsorption cycle, the COP (Coefficient of Performance, cooling efficiency) of the compression unit is greatly improved, and it brings a high-efficiency, high-capacity cooling effect. can be effectively achieved.

Partial driving of hybrid adsorption chiller (S300)

FIG. 3B is a configuration diagram illustrating partial driving of the hybrid adsorption refrigerator according to the embodiment of FIG. 1 .

On the other hand, when the indoor load is reduced and the operation is performed in the partial driving step ( S300 ) that must be partially driven, the following is measured. The temperature is measured by the cold water inlet temperature sensor S1 and the cold water outlet temperature sensor S2 installed in the cold water inlet and outlet main pipes 160 and 170 . By checking the deviation of the cold water inlet temperature and the cold water outlet temperature, it is determined that the partial load condition exceeds the range of the deviation preset in the cooling system. If the temperature deviation meets the load condition of about 50% or less, the unit automatically switches to the single cycle of the adsorption unit.

More specifically, after the measured values of the cold water inlet temperature sensor (S2) and the cold water outlet temperature sensor (S1) reach the cold water target temperature preset in the system, the difference from the cold water inlet temperature is within about 2-3°C. If it decreases, it judges itself to be a partial load.

At this time, the electric compression unit is stopped, and the flow path of the cold water inlet three-way control valve (V10) installed in the cold water main inlet pipe 170 and the cold water outlet three-way control valve (V9) installed in the cold water main outlet pipe 160 is adsorption type. It is adjusted to be connected to the evaporator.

At the same time, the compression type cooling water three-way control valve (V11) installed on the cooling water flow path changes the opening so that the adsorption type cold water inlet pipe 190 and the cooling water supply pipe 210 communicate with each other, and the adsorption type evaporator 1 and the condenser of the compression type unit The cooling control valve (V12) installed on the cooling outlet pipe (220) between (6) is closed, so that the cold water of the system is circulated to the adsorption type evaporator (1) of the adsorption type unit part as a result. Through this series of processes, the compression type unit is completely stopped, and only the adsorption type unit is operated to produce cold water using only low-temperature hot water and supplied to the indoor loads (31, 32, 33, ...).

In addition, when the cooling demand load on the indoor load side increases in the cooling mode of the adsorption unit alone ( S220 ), the hybrid adsorption cycle is automatically switched.

In more detail, if the cooling demand load on the indoor load side increases, it becomes difficult to maintain the target cold water temperature with the adsorption unit alone, and the cold water inlet and outlet temperatures rise. Therefore, the rising trend of the temperature measured by the cold water inlet temperature sensor S2 and the cold water outlet temperature sensor S1 is detected, and if the rising trend compared to the preset target temperature is confirmed by checking the cold water trend for a certain time, the above-mentioned The hybrid adsorption cycle is driven again to realize cooling. In this case, rather than immediately determining the rising trend of the temperature, it is preferably determined as a trend of a certain period of about 2 to 4 cycles of adsorption type.

In addition, if necessary, the amount of heat exchange of the geothermal cooling unit 20 can be controlled. The underground heat exchange control valve V16 of the geothermal cooling unit 20 controls the flow path to have a smaller exchange length. The buried pipe buried underground allows cold water or cooling water to pass underground through a shorter path to prevent unnecessary flow of the flow path.

In general, the cooling load usually changes slowly and is mostly part load. Even when the hybrid adsorption cycle is driven by high-load cooling, a separate control method can be added as well as the control method of the full drive and partial drive. By controlling the Hz to the optimum Hz through inverter control, a method for minimizing power consumption may be additionally implemented.

Example of renewable energy heat source supply part of hybrid adsorption chiller

4 is a block diagram of a hybrid adsorption refrigerator according to another embodiment of the present invention.

Referring to FIG. 4 , it further includes a renewable energy heat source supply unit 30 for selectively applying hot water generated by solar heat and externally supplied hot water to the adsorption towers 3 and 4 . In addition to replacing the geothermal system with cooling water using the geothermal cooling unit 20 , the solar system may be utilized as an adsorption type hot water heat source.

The renewable energy heat source supply unit 30 utilizes solar energy, generates hot water, and provides it to the adsorption towers 3 and 4 . This can further improve the cycle efficiency.

Instead, since there is a possibility that a required heat source may not always be provided due to the characteristics of solar energy, an external heat source may be used when the amount of solar radiation is insufficient or solar power generation is not smooth. As an external heat source, it is possible to supply hot water for district heating or to substitute various heat sources.

In this case, it is controlled whether a heat source generated from solar energy or a separate heat source provided from the outside is used through the heat source control valves V13 and V14.

Examples of prevention of overcooling of hybrid adsorption chillers

4 is a block diagram of a hybrid adsorption refrigerator according to another embodiment of the present invention.

As the refrigerant of the compression unit of the hybrid adsorption chiller as described above, R1234ze, which has a low global warming potential (GWP), or R134A, R410A, which are currently most widely used, are used. In particular, in the case of R1234ze, if the degree of supercooling is too excessive, the expansion valve and the compressor may be damaged, so controlling the supercooling within an appropriate range is essential.

Therefore, when it is not a hot season, the cooling water of the geothermal cooling unit generally flows in at a level of 25 to 30 degrees, so the cooling water made in the adsorption evaporator 1 of the adsorption unit part must be controlled to be maintained at least 12 to 15 degrees. . Preferably, it should be controlled to be maintained at 15 degrees or more. Therefore, the main cooling water pipes 130 and 140 detect the cooling water temperature sensor S4 branching to the adsorption type evaporator 1 of the adsorption unit part, and between the cooling outlet pipe 220 connected between the adsorption type evaporator 1 and the condenser. Each temperature is sensed through the installed cooling hot water temperature sensor (S3). By detecting this, if necessary, the amount of cooling heat of the adsorption towers 3 and 4 is controlled, thereby preventing excessive overcooling of the condenser 6 .

This process is to maintain a constant supercooling temperature based on the pressure of the compression type condenser 6 and the refrigerant temperature, and the temperature of the cooling hot water generated in the adsorption type evaporator 1 is increased through the control operation of the adsorption process. That is, by controlling the adsorption cycle of the adsorption type unit, the temperature of the cooling hot water generated in the adsorption type evaporator 1 is increased. The control operation of the adsorption unit unit can be variously applied as long as it is a method of reducing the cooling effect of the adsorption unit unit. For example, in the adsorption unit unit, it is possible to control a long switching time between the adsorption tower in the adsorption process and the adsorption tower in the desorption process. Alternatively, the temperature of the cooling hot water may be controlled by extending the adsorption time of the adsorption towers 3 and 4 .

As can be seen from the above, the system according to the present invention is free from the existing excessive volume and expensive adsorption refrigerator, and through efficient capacity distribution and cycle configuration with the compression type system, the system maximizes the use of lower various hot water and high efficiency and stability. can be achieved

As described above, the present invention has been described with specific matters such as specific components and limited embodiments and drawings, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , various modifications and variations will be possible without departing from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. Therefore, the spirit of the present invention should not be limited to the described embodiments, and all technical ideas with equivalent or equivalent modifications to the claims as well as the claims to be described later are included in the scope of the present invention. should be interpreted as

1000: hybrid adsorption chiller
1: adsorption type evaporator
2: adsorption type condenser
3: second adsorption tower
4: first adsorption tower
5: Evaporator
6: condenser
8 : Compressor
9: expansion valve
20: geothermal cooling unit
30: renewable energy heat source supply unit

Claims (10)

geothermal cooling unit 20;
an adsorption unit comprising at least two or more adsorption towers (3, 4), an adsorption evaporator (1), and an adsorption condenser (2);
an electro-compression unit comprising an evaporator (5), a compressor (8), a condenser (6) and an expansion valve (9);
including,
The adsorption type evaporator (1) of the adsorption type unit part supplies cold water to the condenser (6) of the electrocompression type unit part, characterized in that it supercools the refrigerant compressed in the compressor (8),

Further comprising a renewable energy heat source supply unit 30 for selectively applying hot water generated by solar heat and externally supplied hot water to the adsorption tower (3, 4),

a cooling water main pipe (110, 120) for transferring cooling water between the geothermal cooling unit (20) and the adsorption type condenser (2);
a cooling water inlet branch pipe 140 branched from the cooling water main pipe 110;
a cooling water supply pipe 210 for transferring the cold water from the cooling water inlet branch pipe 140 to the adsorption type evaporator 1;
A cooling outlet pipe which is installed between the adsorption type evaporator 1 of the adsorption type unit part and the condenser 6 (220);
a compressed cooling water branch pipe 130 for transferring the cooling water from the condenser 6 to the geothermal cooling unit 20 through the cooling water main pipe 120;
Further comprising a cooling control valve (V12) for controlling the cold water between the adsorption evaporator (1) and the condenser (6),

a cold water main inlet pipe 170 and a cold water main outlet pipe 160 for delivering the cold water to the load side (31, 32, 33);
an adsorption-type cold water outlet pipe 180 connecting the cooling outlet pipe 220 and the cold water main outlet pipe 160;
an adsorption-type cold water inlet pipe 190 connecting the cooling water supply pipe 210 and the cold water main inlet pipe 170;
The cooling water inlet branch pipe 140, the cooling water supply pipe 210, and the compressed cooling water three-way control valve (V11) for controlling the flow of the cold water in the adsorption type cold water inlet pipe 190;

a compressed cold water inlet pipe 150 connecting the evaporator 5 and the cold water main inlet pipe 170;
a compressed cold water outlet pipe 200 connecting the evaporator 5 and the cold water main outlet pipe 160;
a cold water inlet three-way control valve (V9) for controlling the flow of the cold water between the compressed cold water outlet pipe 200, the adsorption cold water outlet pipe 180, and the cold water main outlet pipe 160;
a cold water outlet three-way control valve (V10) for controlling the flow of the cold water between the compressed cold water inlet pipe 150, the adsorption cold water inlet pipe 190 and the cold water main inlet pipe 170;

a cold water outlet temperature sensor (S1) for measuring the temperature of the cold water passing through the cold water main outlet pipe 160; and
A cold water inlet temperature sensor (S2) for measuring the temperature of the cold water passing through the cold water main inlet pipe 170;

According to the temperature difference of the cold water measured by the cold water outlet temperature sensor S1 and the cold water inlet temperature sensor S2, the compressed cooling water three-way control valve V11, the cold water outlet three-way control valve V9 and the cold water inlet A hybrid adsorption refrigerator, characterized in that the three-way control valve (V10) is controlled.
delete delete delete delete an adsorption unit comprising at least two or more adsorption towers (3, 4), an adsorption evaporator (1), and an adsorption condenser (2);
an electro-compression unit comprising an evaporator (5), a compressor (8), a condenser (6) and an expansion valve (9);
In the hybrid adsorption refrigerator comprising; at least one geothermal cooling unit 20,
Including the entire driving step (S100) in which the adsorption unit unit and the electrocompression unit unit are simultaneously driven,
In the entire driving step,
The adsorption type evaporator (1) of the adsorption type unit part supplies cold water to the condenser (6) of the electrocompression type unit part, characterized in that it supercools the refrigerant compressed in the compressor (8),

It characterized in that it further comprises a renewable energy hot water supply unit 30 for selectively applying hot water generated by solar heat and externally supplied hot water to the adsorption tower (3, 4),
a cooling water main pipe (110, 120) for transferring cooling water between the geothermal cooling unit (20) and the adsorption type condenser (2);
a cooling water inlet branch pipe 140 branched from the cooling water main pipe 110;
a cooling water supply pipe 210 for transferring the cold water from the cooling water inlet branch pipe 140 to the adsorption type evaporator 1;
A cooling outlet pipe which is installed between the adsorption type evaporator 1 of the adsorption type unit part and the condenser 6 (220);
a cold water main inlet pipe 170 and a cold water main outlet pipe 160 for delivering the cold water to the load side (31, 32, 33);
an adsorption-type cold water outlet pipe 180 connecting the cooling outlet pipe 220 and the cold water main outlet pipe 160;
an adsorption-type cold water inlet pipe 190 connecting the cooling water supply pipe 210 and the cold water main inlet pipe 170;
The cooling water inlet branch pipe 140, the cooling water supply pipe 210, and the compressed cooling water three-way control valve (V11) for controlling the flow of the cold water in the adsorption type cold water inlet pipe 190;

a load measurement step (S200) of measuring the chiller load by measuring the outlet temperature of the cold water supplied to the load side (31, 32, 33) and the inlet temperature of the cold water recovered from the load side (31, 32, 33); and
When it is determined that the partial load state in the load measuring step (S200), stopping the electro-compressive unit part, characterized in that it further comprises a partial driving step (S300) of driving only the adsorption type unit part,

When an upward trend of the cold water inlet temperature or the cold water outlet temperature is confirmed in the load measuring step (S200), the driving method of the hybrid adsorption refrigerator, characterized in that the conversion to the entire driving step (S100).
delete delete 7. The method of claim 6,
The partial load state of the partial driving step (S300) is,
The driving method of a hybrid adsorption refrigerator, characterized in that the difference between the cold water inlet temperature and the cold water outlet temperature measured in the load measuring step (S200) is within 2 to 3 degrees Celsius.


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