Cold and hot integrated compression condensation system and control method

Abstract

The invention discloses a cold and hot integrated compression condensation system and a control method.The cold and hot integrated compression condensation system comprises a compressor, a condenser and an expansion valve, a first heat exchanger is connected between an outlet of the compressor and an inlet of the condenser, and a second heat exchanger is connected between an inlet of the compressor and the expansion valve; the first heat exchanger is connected with a heat utilization system, and the second heat exchanger is connected with a cold utilization system. A cold utilization system and a heat utilization system are integrated into one compression condensation system, the problems that a control system is complex and the structure is complex are solved, the requirements for refrigeration and heating can be met at the same time, traditional electric heating is not needed, and resources and cost are saved.

Description

Technical Field

[0001] The present invention belongs to the field of energy conservation, and more specifically, relates to a combined cold and heat compression condensation system and a control method thereof. Background Art

[0002] Currently, condensation systems are widely used in industries such as food, medicine, and chemical engineering. However, in actual use, due to objective factors such as different seasons, environmental temperature differences, and different stages of chemical reactions, the demand for refrigeration or heating is different. Traditional compression condensation systems are mainly used for refrigeration. To achieve both refrigeration and heating modes with one product, it often uses a compression condensation system for refrigeration and electric heating for heating, resulting in waste of resources, increased energy consumption of the product, complex control systems and structures, and the product needs to be equipped with two different systems to meet the purpose of simultaneous heating and refrigeration, which is very inconvenient in actual use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a combined cold and heat compression condensation system and a control method thereof.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A combined cold and heat compression condensation system includes a compressor, a condenser, and an expansion valve. A first heat exchanger is connected between the outlet of the compressor and the inlet of the condenser, and a second heat exchanger is connected between the inlet of the compressor and the expansion valve. The first heat exchanger is connected to a heat-using system, and the second heat exchanger is connected to a cold-using system.

[0006] Further, the heat-using system includes a heat-using unit and a heat storage mechanism. The heat storage mechanism is connected to the first heat exchanger through a heat circulation pipeline for heat exchange, and the heat-using unit is connected to the heat circulation pipeline through a high-temperature bypass branch;

[0007] The cold-using system includes a cold-using unit and a cold storage mechanism. The cold storage mechanism is connected to the second heat exchanger through a cold circulation pipeline for heat exchange, and the cold-using unit is connected to the cold circulation pipeline through a low-temperature bypass branch.

[0008] Further, a hot water pump is provided on the heat circulation pipeline;

[0009] A cold water pump is provided on the cold circulation pipeline.

[0010] Further, a first regulating valve is provided at the connection between the high-temperature bypass branch and the heat circulation pipeline;

[0011] A second regulating valve is provided at the connection between the low-temperature bypass branch and the cold circulation pipeline.

[0012] Further, it further includes a control system for controlling the operating states of the hot water pump, cold water pump, expansion valve, first regulating valve, and second regulating valve.

[0013] Further, it further includes a plurality of temperature sensors respectively disposed on the heat-using unit, cold-using unit, hot circulation pipeline, and cold circulation pipeline, and the plurality of temperature sensors are connected to the control system.

[0014] Further, the heat storage mechanism is a first box body;

[0015] The cold storage mechanism is a second box body.

[0016] Further, heat insulation layers are provided on the outer sides of both the first box body and the second box body.

[0017] A control method for the compression condensation system according to any one of claims 1-8, comprising:

[0018] Real-time collecting the actual temperature T1 of the cold-using unit and the temperature T2 of the low-temperature heat transfer medium in the cold circulation pipeline through the temperature sensor;

[0019] Comparing T1 with the preset temperature T0, calculating the temperature deviation ΔT = T1 - T0, and when ΔT > 0, the control system executes the cold quantity compensation strategy;

[0020] Real-time monitoring the change of ΔT, and when ΔT ≤ 0, gradually reducing the opening degrees of the expansion valve and the second regulating valve.

[0021] Further, the cold quantity compensation strategy is to gradually increase the opening degree of the expansion valve, synchronously open or increase the opening degree of the second regulating valve, adjust the rotation speed of the cold water pump according to the feedback value of T2, reduce the rotation speed of the cold water pump when T2 is less than the preset value, and increase the rotation speed of the cold water pump when T2 is greater than the preset value.

[0022] After adopting the above technical solutions, the integrated hot and cold compression condensation system and control method provided by the present invention have the following beneficial effects compared with the prior art.

[0023] (1) The present invention integrates the cold-using system and the heat-using system into a set of compression condensation system, solves the problems of complex control system and complex structure, and can meet the requirements of refrigeration and heating at the same time.

[0024] (2) The heat-using system utilizes the exhaust heat source of the compressor to recycle the waste heat for heating, replaces the traditional electric heating module, saves the energy consumption required for electric heating. At the same time, the cold-using module subcools the refrigerant, greatly improves the efficiency of the refrigeration module, reduces the waste of hot and cold energy, greatly saves the energy consumption, and reduces the overall energy consumption of the system.

[0025] The following further describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. Description of the Drawings

[0026] The accompanying drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts. In the drawings:

[0027] Figure 1 is a schematic diagram of a hot and cold integrated compression condensation system of the present invention;

[0028] In the figure: 1. Compressor;

[0029] 2. Condenser;

[0030] 3. First heat exchanger;

[0031] 4. Second heat exchanger;

[0032] 5. Expansion valve;

[0033] 6. First box body;

[0034] 7. Second box body;

[0035] 8. Hot water pump;

[0036] 9. Cold water pump;

[0037] 10. Heat-using unit;

[0038] 11. Cold-using unit;

[0039] 12. Heat circulation pipeline;

[0040] 13. Cold circulation pipeline;

[0041] 14. High-temperature bypass branch;

[0042] 15. Low-temperature bypass branch;

[0043] 16. First regulating valve;

[0044] 17. Second regulating valve;

[0045] 18. High-temperature water inlet pipe;

[0046] 19. High-temperature water outlet pipe;

[0047] 20. Low-temperature water inlet pipe;

[0048] 21. Low-temperature water outlet pipe.

[0049] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by reference to specific embodiments. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0051] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0052] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0054] Such as Figure 1As shown in the figure, a combined hot and cold compression condensation system provided by the present invention mainly includes a compressor 1, a condenser 2, and an expansion valve 5. The compressor 1 is used to compress the refrigerant to raise its temperature above 90°C. The outlet of the compressor 1 is connected to the inlet of the condenser 2, and the outlet of the condenser 2 is connected to the inlet of the compressor 1. A first heat exchanger 3 is tightly connected between the outlet of the compressor 1 and the inlet of the condenser 2 to ensure the smooth entry and heat exchange of the high-temperature heat transfer medium. The high-temperature heat transfer medium enters the first heat exchanger 3 for heat exchange. A fan is provided on one side of the condenser 2. The high-temperature heat transfer medium after heat exchange in the first heat exchanger 3 is cooled by forced air convection. An expansion valve 5 is provided between the outlet of the condenser 2 and the inlet of the compressor 1. The expansion valve 5 throttles the cooled refrigerant into a low-temperature heat transfer medium at about -20°C. A second heat exchanger 4 is connected between the inlet of the compressor 1 and the expansion valve 5 to transfer the cold of the low-temperature heat transfer medium to the second heat exchanger 4. The first heat exchanger 3 is connected to the heat-using system, and the second heat exchanger 4 is connected to the cold-using system.

[0055] Further, the first heat exchanger 3 and the second heat exchanger 4 can adopt plate heat exchangers.

[0056] Further, the heat-using system includes a heat-using unit 10 and a heat storage mechanism 6. The heat-using unit 10 is connected to the heat circulation pipeline 12 through a high-temperature bypass branch 14. The heat storage mechanism 6 is connected to the first heat exchanger 3 through the heat circulation pipeline 12 for heat exchange. The heat circulation pipeline 12 includes a high-temperature water inlet pipe 18 and a high-temperature water outlet pipe 19. The heat storage mechanism 6 is used to store the high-temperature heat transfer medium;

[0057] The cold-using system includes a cold-using unit 11 and a cold storage mechanism 7. The cold-using unit 11 is connected to the cold circulation pipeline 13 through a low-temperature bypass branch 15. The cold storage mechanism 7 is connected to the second heat exchanger 4 through the cold circulation pipeline 13 for heat exchange. The cold circulation pipeline 13 includes a low-temperature water inlet pipe 20 and a low-temperature water outlet pipe 21. The cold storage mechanism 7 is used to store the low-temperature heat transfer medium.

[0058] Further, a hot water pump 8 is provided on the high-temperature water inlet pipe 18. When the temperature of the heat-using unit 10 is too high, the hot water pump 8 is closed or reduced. When the temperature of the heat-using unit 10 is too low, the hot water pump 8 is started or increased. The heat-using unit 10 is connected to the high-temperature water outlet pipe 19 through the high-temperature bypass branch 14. The high-temperature bypass branch 14 conveys heat to the heat-using unit 10. After the hot water pump 8 is started, it pushes the high-temperature heat transfer medium to flow in the heat circulation pipeline 12. The temperature of the high-temperature heat transfer medium after passing through the first heat exchanger 3 reaches about 60°C, providing a stable heat source of 50 - 60°C for the heat-using unit 10;

[0059] A cold water pump 9 is provided on the low-temperature water inlet pipe 20. The cold-using unit 11 is connected to the low-temperature water outlet pipe 21 through a low-temperature bypass branch 15. The low-temperature bypass branch 15 conveys cold energy to the cold-using unit 11. After the cold water pump 9 is started, it pushes the low-temperature heat transfer medium to flow in the cold circulation pipeline 13. The temperature of the low-temperature heat transfer medium after passing through the second heat exchanger 4 reaches about -10°C, providing a stable cold source of -10°C to 0°C for the cold-using unit 11.

[0060] Furthermore, a first regulating valve 16 is provided at the connection of the high-temperature water outlet pipe 19 and the high-temperature bypass branch 14, and a second regulating valve 17 is provided at the connection of the low-temperature water outlet pipe 21 and the low-temperature bypass branch 15. It is adjusted according to the real-time temperature requirements of the heat-using unit 10 and the cold-using unit 11. When the temperature of the heat-using unit 10 is too high, the first regulating valve 16 is closed or reduced. When the temperature of the heat-using unit 10 is too low, the first regulating valve 16 is opened or increased. When the temperature of the cold-using unit 11 is too low, the second regulating valve 17 is closed or reduced. When the temperature of the cold-using unit 11 is too high, the second regulating valve 17 is opened or increased.

[0061] Furthermore, it also includes a control system. The control system is used to control the working states of the hot water pump 8, the cold water pump 9, the first regulating valve 16, the second regulating valve 17, and the expansion valve 5. When the temperature of the heat-using unit 10 is relatively low, the control system sends a signal to increase the opening degree of the first regulating valve 16, so that more heat flows into the heat-using unit 10. Conversely, the opening degree is reduced. When the temperature of the refrigeration unit is too high, the opening degree of the second regulating valve 17 is increased, so that more cold energy flows into the cold-using unit 11. Conversely, the opening degree is reduced. Through the first regulating valve 16 and the second regulating valve 17, the temperatures of the heat-using unit 10 and the cold-using unit 11 can be adjusted to meet the strict temperature requirements of different environments and processes, improving the adaptability of the system, being able to flexibly respond to different working scenarios and changes, and improving the operation effect of the system.

[0062] Furthermore, it also includes multiple temperature sensors. The multiple temperature sensors are respectively arranged on the heat-using unit 10, the cold-using unit 11, the high-temperature water outlet pipe 19, and the low-temperature water outlet pipe 21. The multiple temperature sensors are connected to the control system, providing accurate temperature data for the control system, enabling the control system to make reasonable control decisions according to the temperature situation, ensuring the stable operation of the system within the set temperature range, improving the accuracy of the system temperature control, and enhancing the overall performance of the system.

[0063] Furthermore, the heat storage mechanism 6 is a first box body;

[0064] The cold storage mechanism 7 is a second box body.

[0065] Further, heat insulation layers are provided on the outer sides of the first box body and the second box body. High-efficiency heat insulation materials such as polyurethane foam and glass wool can be selected for the heat insulation layers to ensure that the thickness and tightness of the heat insulation layers meet the heat insulation requirements, reduce the heat dissipation during storage, lower the energy consumption, improve the energy utilization efficiency of the system, help maintain the temperature stability of the media in the first box body and the second box body, provide a more stable heat source and cold source for the heat-using unit 10 and the cold-using unit 11, and enhance the overall performance of the system.

[0066] Further, the medium in the circulation pipeline and the box body is not limited to water, and can be water, oil, or other liquids that can circulate.

[0067] Embodiment 2

[0068] The actual temperature T1 of the cold-using unit 11 and the temperature T2 of the low-temperature heat transfer medium in the cold circulation pipeline 13 are collected in real time through a temperature sensor;

[0069] T1 is compared with the preset temperature T0, and the temperature deviation ΔT = T1 - T0 is calculated. When ΔT > 0, the control system executes the cold quantity compensation strategy;

[0070] The change of ΔT is monitored in real time. When ΔT ≤ 0, the opening degrees of the expansion valve 5 and the second regulating valve 17 are gradually reduced.

[0071] Further, the cold quantity compensation strategy is to gradually increase the opening degree of the expansion valve 5, synchronously open or increase the opening degree of the second regulating valve 17, and adjust the rotation speed of the cold water pump 9 according to the feedback value of T2. When T2 is less than the preset value, the rotation speed of the cold water pump 9 is reduced, and when T2 is greater than the preset value, the rotation speed of the cold water pump 9 is increased.

[0072] Further, the adjustment range of the opening degree of the expansion valve 5 is 10% - 100% to ensure that there is enough low-temperature heat transfer medium passing through the low-temperature bypass branch 15 into the cold-using unit 11.

[0073] Embodiment 3

[0074] In order to avoid that the temperature of the high-temperature heat transfer medium provided by the compressor 1 cannot reach the preset temperature requirement, an electric heater is added to the heat-using system. When the high-temperature heat transfer medium in the high-temperature bypass branch 14 fails to reach the preset temperature, the electric heater is turned on to provide the heat required to meet the preset temperature for the heat-using unit.

[0075] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0076] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent can make some changes or modifications to equivalent embodiments by using the technical content prompted above within the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A cold and hot integrated compression condensing system, comprising a compressor, a condenser and an expansion valve, characterized in that: A first heat exchanger is connected between the outlet of the compressor and the inlet of the condenser, a second heat exchanger is connected between the inlet of the compressor and the expansion valve, the first heat exchanger is connected to a heating system, and the second heat exchanger is connected to a cooling system.

2. The integrated cold and hot compression condensation system according to claim 1, characterized in that: The heat-using system comprises a heat-using unit and a heat storage mechanism, wherein the heat storage mechanism is connected to the first heat exchanger through a heat circulation pipeline for heat exchange, and the heat-using unit is connected to the heat circulation pipeline through a high-temperature bypass branch; The cold using system comprises a cold using unit and a cold storage mechanism. The cold storage mechanism is connected to the second heat exchanger through a cold circulation pipeline for heat exchange. The cold using unit is connected to the cold circulation pipeline through a low-temperature bypass branch.

3. The integrated cold and hot compression condensation system according to claim 2, characterized in that: A hot water pump is provided on the heat circulation pipeline; A cold water pump is arranged on the cold circulation pipeline.

4. The cold and hot integrated compression condensation system according to claim 3, characterized in that: A first regulating valve is provided at the connection between the high-temperature bypass branch and the heat circulation pipeline; A second regulating valve is provided at the connection between the low-temperature bypass branch and the cold circulation pipeline.

5. The cold and hot integrated compression condensation system according to claim 4, characterized in that: It also includes a control system, which is used to control the working states of the hot water pump, the cold water pump, the expansion valve, the first regulating valve, and the second regulating valve.

6. The cold and hot integrated compression condensation system according to claim 5, characterized in that: It also includes a plurality of temperature sensors, which are respectively arranged on the heat-using unit, the cold-using unit, the heat circulation pipeline and the cold circulation pipeline, and are connected to the control system.

7. The cold and hot integrated compression condensation system according to claim 2, characterized in that: The heat storage mechanism is a first box; The cold storage mechanism is a second box.

8. The cold and hot integrated compression condensation system according to claim 7, characterized in that: The first box body and the second box body are both provided with a heat preservation layer on the outside.

9. A control method for the compression condensation system according to any one of claims 1 to 8, characterized in that: include: The actual temperature T1 of the cooling unit and the low-temperature heat transfer medium temperature T2 of the cooling circulation pipeline are collected in real time through the temperature sensor; Compare T1 with the preset temperature T0, calculate the temperature deviation ΔT=T1-T0, when ΔT>0, the control system executes the cooling capacity compensation strategy; Monitor the change of ΔT in real time, and when ΔT≤0, gradually reduce the opening of the expansion valve and the second regulating valve.

10. The control method of the compression condensation system according to claim 9, characterized in that: The cooling capacity compensation strategy is to gradually increase the opening of the expansion valve, synchronously open or increase the opening of the second regulating valve, and adjust the speed of the cold water pump according to the feedback value of T2. When T2 is less than the preset value, the speed of the cold water pump decreases, and when T2 is greater than the preset value, the speed of the cold water pump increases.

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