Heat exchange system
By using vortex tubes and injectors instead of throttle valves in steam compression and refrigeration systems, combining multiple evaporators and economizer designs, the problems of throttling loss and low energy efficiency in traditional systems are solved, and more efficient heat exchange is achieved Performance and multi-temperature adaptability.
Patent Information
- Application Number
- CN202211020177.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-08-24
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2042-08-24
AI Technical Summary
In traditional steam compression and refrigeration systems, single-stage compression cycle leads to reduced compressor volume efficiency, increased throttling loss, excessive exhaust temperature, decreased refrigeration capacity, reduced operating energy efficiency, and throttling of expansion valve leads to mechanical energy loss, affecting system performance .
Use vortex tubes and induction devices to replace the throttle valves, use the vortex effect to divert the exhaust gas of the compressor, combine multiple evaporators and induction devices to achieve higher heat exchange efficiency and temperature reduction, and increase the heat exchange efficiency of the evaporator. , and improve the scope of system application through economical devices and multi-temperature zone design.
Effectively reduce throttling losses, improve heat exchange performance, improve the efficiency of condensers and evaporators, enhance the system's adaptability to temperature differences, realize multi-temperature zone refrigeration, air conditioning and hot water requirements, and improve energy efficiency.
Smart Images
Figure CN115289702B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of heat exchange, in particular to a heat exchange system. Background Art
[0002] With the advancement of science and technology, people's living standards have improved, and energy consumption has also increased. Building energy consumption has become a giant in energy consumption, of which the HVAC industry accounts for the majority. In the context of the "carbon peak and carbon neutrality" era, energy conservation and emission reduction are imminent.
[0003] In traditional steam compression refrigeration systems, a single-stage compression cycle is mostly used to achieve refrigeration. When the temperature difference between indoor and outdoor is large, the compression ratio that the compressor can provide is too small, resulting in reduced volumetric efficiency of the compressor, increased throttling losses, excessively high exhaust temperature, reduced refrigeration (or heating) capacity, and reduced operating energy efficiency; and the system mostly uses expansion valves for throttling and pressure reduction, resulting in mechanical energy loss of the high-pressure working fluid after throttling, affecting system performance. Summary of the invention
[0004] In order to solve the technical problem in the prior art that throttling loss exists in the steam heat exchange system and affects the system performance, a heat exchange system is provided which is provided with a vortex tube and an ejector to overcome the throttling loss.
[0005] A heat exchange system comprises a compressor, a vortex tube, a first condenser, a first ejection mechanism, a first evaporator and a gas-liquid separator, wherein the inlet of the vortex tube is connected to the exhaust port of the compressor, the hot end outlet of the vortex tube is connected to the refrigerant inlet of the gas-liquid separator through the first condenser, the cold end outlet of the vortex tube is connected to the main ejection port of the first ejection mechanism, the outlet of the first ejection mechanism is connected to the refrigerant inlet of the gas-liquid separator, the ejected port of the first ejection mechanism is connected to the first evaporator, the first evaporator is connected to the liquid refrigerant outlet of the gas-liquid separator through a first throttling mechanism, and the gaseous refrigerant outlet of the gas-liquid separator is connected to the suction port of the compressor.
[0006] The heat exchange system also includes a second ejector mechanism and a second evaporator, the main ejector port of the second ejector mechanism is connected to the condenser, the ejected port of the second ejector mechanism is connected to the second evaporator, the outlet of the second ejector mechanism is connected to the refrigerant inlet of the gas-liquid separator, and the second evaporator is connected to the liquid refrigerant outlet of the gas-liquid separator.
[0007] The heat exchange system also includes an economizer and a second throttling mechanism. The economizer has a main pipeline and an auxiliary pipeline for mutual heat exchange. One end of the main pipeline is connected to the first condenser, and the other end of the main pipeline is connected to the main injection port of the second injection mechanism. One end of the auxiliary pipeline is connected to the first condenser through the second throttling mechanism, and the other end of the auxiliary pipeline is connected to the air supply port of the compressor.
[0008] The heat exchange system also includes a third evaporator, a third condenser and a driving mechanism. The third evaporator, the third condenser and the driving mechanism are connected in sequence to form a heat exchange cycle, and the third condenser exchanges heat with the liquid refrigerant in the gas-liquid separator.
[0009] A heat exchange coil is arranged in the gas-liquid separator, and the heat exchange coil constitutes the third condenser.
[0010] The refrigerant in the heat exchange cycle includes water or ethylene glycol solution.
[0011] The heat exchange system further includes a refrigeration mechanism, and the first evaporator is located in the refrigeration mechanism.
[0012] The heat exchange system further includes a refrigeration mechanism, and the second evaporator is located in the refrigeration mechanism.
[0013] The heat exchange system further includes a hot water making mechanism, and the hot water making mechanism is communicated with the first condenser.
[0014] The refrigerant in the heat exchange system includes water vapor.
[0015] The heat exchange system provided by the present invention utilizes a first ejection mechanism and a second ejection mechanism to replace the throttle valve used in the prior art, thereby effectively reducing throttling losses and effectively improving the heat exchange performance of the heat exchange system. At the same time, the vortex effect of the vortex tube is utilized to divert the exhaust gas of the compressor, so that under a constant exhaust pressure, the condenser can provide a higher heat exchange efficiency, and at the same time, the temperature of the refrigerant entering the evaporator is further reduced, thereby increasing the heat exchange efficiency of the evaporator. At the same time, multiple evaporators are arranged to meet the needs of multi-temperature zone refrigeration, air conditioning regulation, domestic hot water, etc., thereby improving the scope of application of the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic diagram of the structure of a heat exchange system provided in an embodiment of the present invention;
[0017] In the figure:
[0018] 1. Compressor; 2. Vortex tube; 3. First condenser; 4. First ejector mechanism; 5. First evaporator; 6. Gas-liquid separator; 7. Second ejector mechanism; 8. Second evaporator; 9. Economizer; 10. Second throttling mechanism; 11. Third evaporator; 12. Third condenser; 13. Driving mechanism; 14. First throttling mechanism. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0020] like Figure 1 The heat exchange system shown includes a compressor 1, a vortex tube 2, a first condenser 3, a first ejection mechanism 4, a first evaporator 5 and a gas-liquid separator 6, wherein the inlet of the vortex tube 2 is connected to the exhaust port of the compressor 1, the hot end outlet of the vortex tube 2 is connected to the refrigerant inlet of the gas-liquid separator 6 through the first condenser 3, the cold end outlet of the vortex tube 2 is connected to the main ejection port of the first ejection mechanism 4, the outlet of the first ejection mechanism 4 is connected to the refrigerant inlet of the gas-liquid separator 6, the ejected port of the first ejection mechanism 4 is connected to the first evaporator 5, the first evaporator 5 is connected to the liquid refrigerant outlet of the gas-liquid separator 6 through the first throttling mechanism 14, and the gaseous refrigerant outlet of the gas-liquid separator 6 is connected to the suction port of the compressor 1. The first ejection mechanism 4 and the second ejection mechanism are used to replace the throttle valve used in the prior art, thereby effectively reducing throttling losses and effectively improving the heat exchange performance of the heat exchange system. At the same time, the vortex effect of the vortex tube 2 is used to divert the exhaust gas of the compressor 1, so that under a constant exhaust pressure, the condensing mechanism (first condenser 3) can provide a higher heat exchange efficiency. At the same time, the temperature of the refrigerant entering the evaporating mechanism is further reduced, thereby increasing the heat exchange efficiency of the evaporating mechanism (first evaporator 5).
[0021] Specifically, the refrigerant discharged from the exhaust port of the compressor 1 is divided into two streams, one cold and one hot, under the action of the vortex tube 2. One stream of refrigerant is discharged from the hot end outlet to the first condenser 3 for condensation and heat release. The refrigerant after heat exchange flows back to the gas-liquid separator 6. The other stream of refrigerant enters the main injection port of the first injection mechanism 4 from the cold end outlet, and can flow back to the gas-liquid separator 6 through the outlet of the first injection mechanism 4. At the same time, negative pressure is generated at the injected port of the first injection mechanism 4 to suck the liquid refrigerant in the gas-liquid separator 6 into the first evaporator 5 for heat exchange. The refrigerant after heat exchange through the first evaporator 5 flows back to the gas-liquid separator 6 under the action of the first injection mechanism 4, completing the entire heat exchange cycle of the heat exchange system. The temperature of the refrigerant discharged from the hot end outlet is higher than that of the refrigerant at the cold end outlet. The first condenser 3 can provide a higher heat exchange efficiency. At the same time, the temperature of the refrigerant entering the first evaporator 5 is further reduced compared with the prior art, thereby increasing the heat exchange efficiency of the first evaporator 5.
[0022] Optionally, the heat exchange system further includes a second ejection mechanism 7 and a second evaporator 8, wherein the main ejection port of the second ejection mechanism 7 is in communication with the condenser, the ejected port of the second ejection mechanism 7 is in communication with the second evaporator 8, the outlet of the second ejection mechanism 7 is in communication with the refrigerant inlet of the gas-liquid separator 6, and the second evaporator 8 is in communication with the liquid refrigerant outlet of the gas-liquid separator 6. The refrigerant after heat exchange in the second evaporator 8 is ejected into the gas-liquid separator 6 by using the refrigerant flowing into the gas-liquid separator 6 from the first condenser 3, thereby ensuring that the second evaporator 8 can obtain the liquid refrigerant from the gas-liquid separator 6 for heat exchange, and the refrigerant after heat exchange is returned to the gas-liquid separator 6 to complete the heat exchange cycle.
[0023] Optionally, the heat exchange system further includes an economizer 9 and a second throttling mechanism 10, wherein the economizer 9 has a main pipeline and an auxiliary pipeline for mutual heat exchange, one end of the main pipeline is connected to the first condenser 3, and the other end of the main pipeline is connected to the main injection port of the second injection mechanism 7, one end of the auxiliary pipeline is connected to the first condenser 3 through the second throttling mechanism 10, and the other end of the auxiliary pipeline is connected to the air supply port of the compressor 1. The economizer 9 is used to supply air to the compressor 1 to increase enthalpy, further improve the heat exchange capacity of the heat exchange system, and improve the operating energy efficiency ratio, thereby increasing the adaptability of the heat exchange system to the indoor and outdoor temperature difference.
[0024] Preferably, the economizer 9 is a plate heat exchanger or a shell and tube heat exchanger.
[0025] In order to enable the heat exchange system to achieve the effect of multi-temperature zone heat exchange, the heat exchange system also includes a third evaporator 11, a third condenser 12 and a driving mechanism 13. The third evaporator 11, the third condenser 12 and the driving mechanism 13 are connected in sequence to form a heat exchange cycle, and the third condenser 12 exchanges heat with the liquid refrigerant in the gas-liquid separator 6. The refrigerant in the heat exchange cycle flows between the third evaporator 11 and the third condenser 12 under the drive of the driving mechanism 13. Since the third condenser 12 can exchange heat with the liquid refrigerant in the gas-liquid separator 6, the refrigerant in the heat exchange cycle can release heat at the third condenser 12 and absorb heat at the third evaporator 11, thereby achieving a heat exchange effect. The driving mechanism 13 is a power pump.
[0026] At the same time, the first evaporator 5, the second evaporator 8 and the third evaporator 11 can be used to exchange heat in three areas as needed, thereby achieving the effect of heat exchange in multiple temperature zones by the heat exchange system. Of course, in order to further increase the number of temperature zones, multiple sets of third evaporators 11, third condensers and drive mechanisms 13 can be selected to achieve heat exchange in multiple temperature zones through multiple third evaporators 11.
[0027] Preferably, the first evaporator 5 is the main evaporator, which mainly serves to ensure the normal operation of the compressor 1. Its temperature is lower than that of the second evaporator 8 and the third evaporator 11, and it is a low-temperature evaporator; the second evaporator 8 is still connected in series in the heat exchange cycle where the compressor 1 is located, so its temperature is higher than that of the third evaporator 11, and it is a medium-temperature evaporator; the third evaporator 11 is a surface cooler.
[0028] To this end, the heat exchange system further includes a refrigeration mechanism, in which the second evaporator 8 is located, and the refrigeration function is achieved by using the second evaporator 8. Similarly, the heat exchange system further includes a freezing mechanism, in which the first evaporator 5 is located, and the freezing function is achieved by using the first evaporator 5.
[0029] The gas-liquid separator 6 is provided with a heat exchange coil, which constitutes the third condenser 12. That is, the gas-liquid separator 6 may be a shell-and-tube heat exchanger, and part or all of the heat exchange coils are below the liquid level of the shell-and-tube heat exchanger, thereby achieving the effect of cooling the refrigerant in the heat exchange coils.
[0030] The refrigerant in the heat exchange cycle includes water or ethylene glycol solution.
[0031] The heat exchange system further includes a hot water making mechanism, which is connected to the first condenser 3. By utilizing the vortex effect of the vortex tube 2, the heat exchange system can provide a higher heat exchange effect in the first condenser 3 under a constant exhaust pressure, thereby producing hot water at a higher temperature.
[0032] The refrigerant in the heat exchange system includes water vapor.
[0033] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
Claims
1. A heat exchange system, characterized in that: The invention comprises a compressor (1), a vortex tube (2), a first condenser (3), a first ejection mechanism (4), a first evaporator (5) and a gas-liquid separator (6), wherein the inlet of the vortex tube (2) is connected to the exhaust port of the compressor (1), the hot end outlet of the vortex tube (2) is connected to the refrigerant inlet of the gas-liquid separator (6) through the first condenser (3), the cold end outlet of the vortex tube (2) is connected to the main ejection port of the first ejection mechanism (4), the outlet of the first ejection mechanism (4) is connected to the refrigerant inlet of the gas-liquid separator (6), the ejected port of the first ejection mechanism (4) is connected to the first evaporator (5), and the The first evaporator (5) is connected to the liquid refrigerant outlet of the gas-liquid separator (6) through a first throttling mechanism (14), and the gas refrigerant outlet of the gas-liquid separator (6) is connected to the suction port of the compressor (1); the heat exchange system also includes a second ejection mechanism (7) and a second evaporator (8), the main ejection port of the second ejection mechanism (7) is connected to the condenser, the ejected port of the second ejection mechanism (7) is connected to the second evaporator (8), the outlet of the second ejection mechanism (7) is connected to the refrigerant inlet of the gas-liquid separator (6), and the second evaporator (8) is connected to the liquid refrigerant outlet of the gas-liquid separator (6).
2. The heat exchange system according to claim 1, characterized in that: The heat exchange system also includes an economizer (9) and a second throttling mechanism (10), the economizer (9) having a main pipeline and an auxiliary pipeline for mutual heat exchange, one end of the main pipeline being connected to the first condenser (3), the other end of the main pipeline being connected to the main injection port of the second injection mechanism (7), one end of the auxiliary pipeline being connected to the first condenser (3) via the second throttling mechanism (10), the other end of the auxiliary pipeline being connected to the air supply port of the compressor (1).
3. The heat exchange system according to claim 1, characterized in that: The heat exchange system further comprises a third evaporator (11), a third condenser (12) and a driving mechanism (13); the third evaporator (11), the third condenser (12) and the driving mechanism (13) are connected in sequence to form a heat exchange cycle, and the third condenser (12) exchanges heat with the liquid refrigerant in the gas-liquid separator (6).
4. The heat exchange system according to claim 3, characterized in that: A heat exchange coil is arranged in the gas-liquid separator (6), and the heat exchange coil constitutes the third condenser (12).
5. The heat exchange system according to claim 3, characterized in that: The refrigerant in the heat exchange cycle includes water or ethylene glycol solution.
6. The heat exchange system according to claim 1, characterized in that: The heat exchange system further comprises a refrigeration mechanism, and the first evaporator (5) is located inside the refrigeration mechanism.
7. The heat exchange system according to claim 1, characterized in that: The heat exchange system further comprises a refrigeration mechanism, and the second evaporator (8) is located inside the refrigeration mechanism.
8. The heat exchange system according to claim 1, characterized in that: The heat exchange system further comprises a hot water making mechanism, which is connected to the first condenser (3).
9. The heat exchange system according to claim 1, characterized in that: The refrigerant in the heat exchange system includes water vapor.