CN105157274B - cooling/heating system - Google Patents

Abstract

A cooling/heating system includes a compressor, a condensing/heating unit, a preheat regenerator, a subcool regenerator, a first throttling element, and an evaporator. The refrigerating/heating system is provided with a refrigerating circulation loop and a fluid heating pipeline, can realize refrigeration and heating at the same time, realizes cold and hot dual purposes, and can also realize refrigeration or heating independently. According to the refrigeration/heating system, the exhaust temperature of the compressor is increased by increasing the return air temperature of the compressor during heating, the refrigeration/heating system can be used for generating hot fluid, particularly domestic or drinking hot water, the water temperature can reach 99 ℃, the efficient utilization of electric energy is realized, the utilization efficiency of converting the electric energy into heat energy is improved, and the efficiency can be more than 1; meanwhile, the heat can be effectively recovered, and the heat pollution to the environment is reduced. The refrigerating/heating system is not only suitable for a single-medium steam compression type system, but also suitable for a mixed working medium steam compression type system.

Description

Cooling/Heating System

technical field

The invention belongs to the technical field of refrigeration, and in particular relates to a refrigeration/heating system.

Background technique

In many vapor compression refrigeration systems, such as household refrigerators, display cabinets in shopping malls, air conditioners, etc., the temperature of the refrigerant discharged from the compressor is very high, usually up to 70-120°C. In order to achieve refrigeration needs, the refrigerant gas needs to be cooled (Condensation) to 40~50℃ saturated or supercooled liquid, traditionally, this part of heat needs to be transferred to air or water with a special air-cooled or water-cooled condenser, because this part of energy is approximately equal to the power consumption of the compressor and The sum of the cooling capacity of the evaporator will not only cause a great waste of energy, but also may cause "thermal pollution" to the environment. At the same time, there is always a demand for hot water in life. The common method is to directly obtain hot water through electric heating. The maximum electric heating efficiency is 1, resulting in a waste of high-grade electric energy. The use of vapor compression system heating is equivalent to the heat pump working condition, and its heating efficiency is at least 1, which can effectively use electric energy.

In order to recover or utilize the heat of condensation of the refrigerant, the patent 200710195681.1 provides an improved vapor compression refrigeration system and its application, which is characterized in that in the system, the condenser is equipped with a thermostat, when the condenser When the cold water is heated to 40°C by the condensation heat, the thermostat will push 40°C low-temperature hot water into the heat preservation water tank through the control system. On sunny days, the solar energy will be used to heat the heat pump to 70°C hot water for bathing and domestic use on rainy days, so that the system When cooling the air conditioner, hot water is produced at the same time, which will not affect the cooling effect. However, its system can only obtain hot water at 40°C, and it needs auxiliary solar energy or a heat pump to produce hot water at 70°C, let alone the temperature of drinking water.

Contents of the invention

In view of this, it is necessary to provide a cooling/heating system capable of cooling while obtaining hot water with a higher temperature.

A refrigeration/heating system, including a compressor, a condensation/heater, a preheating regenerator, a subcooling regenerator, a first throttling element, and an evaporator;

The high pressure outlet of the compressor is connected to the refrigerant inlet of the condensing/heater, the refrigerant outlet of the condensing/heater is connected to the high pressure inlet of the preheating regenerator, and the high pressure of the preheating regenerator The outlet is connected to the high-pressure inlet of the subcooling regenerator, the high-pressure outlet of the subcooling regenerator is connected to the inlet of the first throttling element, and the outlet of the first throttling element is connected to the inlet of the evaporator , the outlet of the evaporator is connected to the low pressure inlet of the subcooling regenerator, the low pressure outlet of the subcooling regenerator is connected to the low pressure inlet of the preheating regenerator, and the low pressure of the preheating regenerator The outlet is connected to the inlet of the compressor to form a refrigeration cycle, and the evaporator can output cooling capacity to the outside;

The condensing/heater also includes a fluid inlet and a fluid outlet, the preheating regenerator also includes a fluid inlet and a fluid outlet, the fluid inlet of the preheating regenerator flows into the fluid to be heated, and the preheating regenerator The fluid outlet of the device is connected to the condensing/heater fluid inlet, and the condensing/heater fluid outlet is a hot fluid outlet, forming a fluid heating pipeline for heating the fluid;

The refrigeration/heating system also includes a three-way switching valve, a second throttling element and a heat exchanger;

The refrigerant outlet of the condensing/heater is connected to the inlet of the three-way switching valve, the first outlet of the three-way switching valve is connected to the high-pressure inlet of the preheating regenerator, and the first outlet of the three-way switching valve is The two outlets are connected to the inlet of the second throttling element, the outlet of the second throttling element is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the compressor to form a loop.

In one of the embodiments, it also includes a cold fluid heat exchanger, the cold fluid heat exchanger is arranged between the evaporator and the subcooling regenerator, and the outlet of the evaporator is connected to the cold fluid The first inlet of the heat exchanger, the first outlet of the cold fluid heat exchanger is connected to the low-pressure inlet of the subcooling regenerator;

The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and after exchanging heat, flows out from the second outlet of the cold fluid heat exchanger to become cold fluid and form a refrigeration pipeline for producing cold fluid. fluid.

In one of the embodiments, it also includes a cold fluid heat exchanger, the cold fluid heat exchanger is arranged between the evaporator and the subcooling regenerator, and the outlet of the evaporator is connected to the cold fluid The first inlet of the heat exchanger, the first outlet of the cold fluid heat exchanger is connected to the low-pressure inlet of the subcooling regenerator;

The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and flows out from the second outlet of the cold fluid heat exchanger after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid.

In one of the embodiments, it also includes a gas-liquid separator and a third throttling element, the refrigerant outlet of the condensation/heater is connected to the inlet of the gas-liquid separator, and the liquid phase outlet of the gas-liquid separator The inlet of the third throttling element is connected, the outlet of the third throttling element is connected to the low-pressure inlet of the preheating regenerator, and the vapor phase outlet of the vapor-liquid separator is connected to the preheating regenerator high pressure inlet.

In one of the embodiments, it also includes a cold fluid heat exchanger, the cold fluid heat exchanger is arranged between the evaporator and the subcooling regenerator, and the outlet of the evaporator is connected to the cold fluid The first inlet of the heat exchanger, the first outlet of the cold fluid heat exchanger is connected to the low-pressure inlet of the subcooling regenerator;

The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and after exchanging heat, flows out from the second outlet of the cold fluid heat exchanger to become cold fluid and form a refrigeration pipeline for producing cold fluid. fluid.

In one of the embodiments, it also includes a three-way switching valve, a second throttling element and a heat exchanger;

The refrigerant outlet of the condensing/heater is connected to the inlet of the three-way switching valve, the first outlet of the three-way switching valve is connected to the inlet of the gas-liquid separator, and the second outlet of the three-way switching valve The inlet of the second throttling element is connected, the outlet of the second throttling element is connected with the inlet of the heat exchanger, and the outlet of the heat exchanger is connected with the inlet of the compressor to form a loop.

In one of the embodiments, it also includes a cold fluid heat exchanger, the cold fluid heat exchanger is arranged between the evaporator and the subcooling regenerator, and the outlet of the evaporator is connected to the cold fluid The first inlet of the heat exchanger, the first outlet of the cold fluid heat exchanger is connected to the low-pressure inlet of the subcooling regenerator;

The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and after exchanging heat, flows out from the second outlet of the cold fluid heat exchanger to become cold fluid and form a refrigeration pipeline for producing cold fluid. fluid.

In one of the embodiments, the condensation/heater is filled with cold and heat storage materials.

In one of the embodiments, the evaporator is filled with cold and heat storage materials.

The above-mentioned refrigeration/heating system raises the return air temperature of the compressor through high-efficiency heat recovery, and increases the discharge temperature of the compressor. It can produce hot fluid, especially domestic or drinking hot water, while cooling, and the water temperature can reach 99°C. Utilizing the refrigerant discharged from the compressor to heat the thermal fluid required for daily life can efficiently utilize electric energy, improve the utilization efficiency of electric energy into heat energy, and make the efficiency greater than 1. At the same time, it can effectively recover heat and reduce the impact on the environment. Thermal pollution The above refrigeration/heating systems are not only applicable to single medium vapor compression systems, but also to mixed working medium vapor compression systems.

Description of drawings

FIG. 1 is a schematic structural diagram of the refrigeration/heating system of Embodiment 1.

FIG. 2 is a schematic structural diagram of the cooling/heating system of Embodiment 2. FIG.

FIG. 3 is a schematic structural diagram of the cooling/heating system of Embodiment 3. FIG.

FIG. 4 is a schematic structural diagram of the cooling/heating system of Embodiment 4. FIG.

FIG. 5 is a schematic structural diagram of the cooling/heating system of Embodiment 5. FIG.

FIG. 6 is a schematic structural diagram of the cooling/heating system of Embodiment 6. FIG.

FIG. 7 is a schematic structural diagram of the cooling/heating system of Embodiment 7. FIG.

Fig. 8 is a schematic structural diagram of the refrigeration/heating system of Embodiment 8.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

Please refer to FIG. 1, a cooling/heating system 10 of an embodiment, including a compressor 110, a condensation/heater 120, a preheating regenerator 130, a subcooling regenerator 140, a first throttling element 150 and an evaporator 160. The refrigeration/heating system 10 has a refrigeration cycle circuit and a fluid heating pipeline.

The connection method is: the high-pressure outlet of the compressor 110 is connected to the refrigerant inlet of the condensing/heater 120, the refrigerant outlet of the condensing/heater 120 is connected to the high-pressure inlet of the preheating regenerator 130, and the high-pressure inlet of the preheating regenerator 130 The outlet is connected to the high-pressure inlet of the subcooling regenerator 140, the high-pressure outlet of the subcooling regenerator 140 is connected to the inlet of the first throttling element 150, the outlet of the first throttling element 150 is connected to the inlet of the evaporator 160, and the outlet of the evaporator 160 is connected to The low-pressure inlet of the subcooling regenerator 140, the low-pressure outlet of the subcooling regenerator 140 is connected to the low-pressure inlet of the preheating regenerator 130, and the low-pressure outlet of the preheating regenerator 130 is connected with the inlet of the compressor 110 to form a refrigeration cycle circuit. The evaporator 160 can output cooling capacity to the outside.

Condenser/heater 120 also includes a fluid inlet and a fluid outlet. The preheat regenerator 130 also includes a fluid inlet and a fluid outlet. The fluid inlet of the preheating regenerator 130 flows into the fluid to be heated, the fluid outlet of the preheating regenerator 130 is connected to the fluid inlet of the condensation/heater 120, and the fluid outlet of the condensation/heater 120 is a hot fluid outlet, forming a fluid heating pipeline. For heating fluids.

The working process of the refrigeration/heating system 10 is as follows: the refrigeration and heating systems work simultaneously, and the refrigerant (refrigerant working fluid) is compressed by the compressor 110 to form a high-pressure gas with a temperature of about 100°C to 120°C. After being cooled by the condenser/heater 120, a vapor-liquid two-phase is formed. The temperature is further lowered by the preheating regenerator 130 and the subcooling regenerator 140 to become a subcooled refrigerant. The subcooled refrigerant becomes a low-pressure vapor-liquid two-phase state after being throttled by the first throttling element 150 , and then the liquid phase becomes a gas after absorbing heat in the evaporator 160 . Then it is reheated in the subcooling regenerator 140 and the preheating regenerator 130 to become superheated gas, and then enters the compressor 110 to complete the refrigeration cycle.

At the same time, the fluid to be heated enters the preheating regenerator 130 from the fluid inlet of the preheating regenerator 130, heats up in the preheating regenerator 130, and then enters the heat of the condensation/heater 120 to further raise the temperature to 99°C. The fluid then exits the fluid outlet of the condensing/heater 120. Specifically, the fluid to be heated may be water, and the hot fluid flowing out from the fluid outlet of the condensation/heater 120 may be domestic or drinking hot water.

Example 2

Referring to FIG. 2 , the refrigeration/heating system 20 of this embodiment further includes a cold fluid heat exchanger 270 on the basis of the refrigeration/heating system 10 of Embodiment 1. Referring to FIG. The refrigeration/heating system 20 also has a refrigeration pipeline.

The connection method is: the cold fluid heat exchanger 270 is arranged between the evaporator 260 and the subcooling regenerator 240 . The outlet of the evaporator 260 is connected to the first inlet of the cold fluid heat exchanger 270 , and the first outlet of the cold fluid heat exchanger 270 is connected to the low pressure inlet of the subcooling regenerator 240 . The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger 270, and flows out from the second outlet of the cold fluid heat exchanger 270 after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid.

The working process of the refrigeration/heating system 20 is as follows: the refrigeration and heating systems work simultaneously, and the refrigerant (refrigerant working fluid) is compressed by the compressor 210 to form a high-pressure gas with a temperature of about 100°C-120°C. After being cooled by the condenser/heater 220, a vapor-liquid two-phase is formed. After the preheating regenerator 230 and the subcooling regenerator 240, the temperature is further lowered to become a subcooled refrigerant. After being throttled by the first throttling element 250 , the subcooled refrigerant becomes a low-pressure vapor-liquid two-phase state, and then the liquid phase becomes a gas after absorbing heat in the evaporator 260 . Subsequently, through the cold fluid heat exchanger 270, exchange heat with the fluid to be refrigerated in the cold fluid heat exchanger 270, then pass through the subcooling regenerator 240 and the preheating regenerator 230 to reheat, become superheated gas, and then enter the compression Machine 210 completes the refrigeration cycle.

At the same time, the fluid to be heated enters the preheating regenerator 230 from the fluid inlet of the preheating regenerator 230, heats up in the preheating regenerator 230, and then enters the heat of the condensation/heater 220 to further raise the temperature to 99°C. The fluid then exits the fluid outlet of the condensing/heater 220. Specifically, the fluid to be heated may be water, and the hot fluid flowing out from the fluid outlet of the condensation/heater 220 may be domestic or drinking hot water.

At the same time, the fluid to be refrigerated at room temperature flows in from the second inlet of the cold fluid heat exchanger 270 , and flows out from the second outlet of the cold fluid heat exchanger 270 after heat exchange to cool down to the required temperature.

Example 3

Referring to FIG. 3 , the refrigeration/heating system 30 of this embodiment further includes a three-way switching valve 380 , a second throttling element 390 and a heat exchanger 395 on the basis of the refrigeration/heating system 10 of Embodiment 1.

The connection method is: the refrigerant outlet of the condensing/heater 320 is connected to the inlet of the three-way switching valve 380, the first outlet of the three-way switching valve 380 is connected to the high-pressure inlet of the preheating regenerator 330, and the second of the three-way switching valve 380 The outlet is connected to the inlet of the second throttling element 390, the outlet of the second throttling element 390 is connected to the inlet of the heat exchanger 395, and the outlet of the heat exchanger 395 is connected to the inlet of the compressor 310 to form a loop.

The working process of the cooling/heating system 30 is as follows: when the cooling and heating systems work simultaneously, switch the three-way switching valve 380 so that the refrigerant outlet of the condensation/heater 320 communicates with the high-pressure inlet of the preheating regenerator 330, and at the same time The second outlet of the three-way switching valve 380 is closed. The refrigerant is compressed by the compressor 310 to form a high-pressure gas with a temperature of about 100°C to 120°C. It is cooled by the condensation/heater 320 to form a vapor-liquid two-phase. Further cooling becomes a supercooled liquid. The subcooled refrigerant becomes a low-pressure vapor-liquid two-phase state after being throttled by the first throttling element 350, and becomes a gas after absorbing heat in the evaporator 360, and then recovers heat in the subcooling regenerator 340 and the preheating regenerator 330 Become superheated gas, enter the compressor 310 to complete the refrigeration cycle.

At the same time, the fluid to be heated enters the preheating regenerator 330 from the fluid inlet of the preheating regenerator 330, heats up in the preheating regenerator 330, and then enters the heat of the condensation/heater 320 to further raise the temperature to 99°C. The fluid then exits the fluid outlet of the condensing/heater 320. Specifically, the fluid to be heated may be water, and the hot fluid flowing out from the fluid outlet of the condensation/heater 320 may be domestic or drinking hot water.

When only the heating system is needed, switch the three-way switching valve 380 to connect the refrigerant outlet of the condensing/heater 320 with the second throttling element 390 , and close the first outlet of the three-way switching valve 380 at the same time. After being cooled by the condensing/heater 320, the refrigerant gas is throttled and depressurized into the heat exchanger 395, where it absorbs air heat to become a low-pressure gas, and then re-enters the compressor 310 to be compressed to complete the cycle.

Example 4

Please refer to FIG. 4 , the refrigeration/heating system 40 of this embodiment further includes a cold fluid heat exchanger 470 on the basis of the combined refrigeration/heating system 30 of Embodiment 3. The refrigeration/heating system 40 also has a refrigeration pipeline. Refrigeration lines are used to produce cold fluids.

The connection method is as follows: the cold fluid heat exchanger 470 is arranged between the evaporator 460 and the subcooling regenerator 440 . The outlet of the evaporator 460 is connected to the first inlet of the cold fluid heat exchanger 470 , and the first outlet of the cold fluid heat exchanger 470 is connected to the low pressure inlet of the subcooling regenerator 440 .

The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger 470, and flows out from the second outlet of the cold fluid heat exchanger 470 after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid.

The working process of the refrigeration/heating system 40 is as follows: the difference from the refrigeration/heating system 30 of Embodiment 3 is that the fluid to be cooled can be cooled to the required temperature through the cold fluid heat exchanger 470 .

Example 5

Please refer to Fig. 5, the cooling/heating system 50 of the present embodiment includes a compressor 510, a condensation/heater 520, a vapor-liquid separator 525, a preheating regenerator 530, a subcooling regenerator 540, the first section Flow element 550, evaporator 560, third throttling element 535, piping and valves. The refrigeration/heating system 50 is particularly suitable for a mixed working fluid refrigeration cycle system. The refrigeration/heating system 50 has a refrigeration cycle circuit and a fluid heating pipeline.

The connection mode of the refrigeration cycle circuit is: the high-pressure outlet of the compressor 510 is connected to the refrigerant inlet of the condensation/heater 520, the refrigerant outlet of the condensation/heater 520 is connected to the inlet of the vapor-liquid separator 525, and the outlet of the vapor-liquid separator 525 is divided into It is two-way: the liquid phase outlet of the vapor-liquid separator 525 is connected to the inlet of the third throttling element 535, and the outlet of the third throttling element 535 is connected to the low-pressure inlet of the preheating regenerator 530; the vapor phase outlet of the vapor-liquid separator 525 connected to the high pressure inlet of the preheating regenerator 530, the high pressure outlet of the preheating regenerator 530 is connected to the high pressure inlet of the subcooling regenerator 540, the high pressure outlet of the subcooling regenerator 540 is connected to the inlet of the first throttling element 550, The outlet of the first throttling element 550 is connected to the inlet of the evaporator 560, the outlet of the evaporator 560 is connected to the low pressure inlet of the subcooling regenerator 540, the low pressure outlet of the subcooling regenerator 540 is connected to the low pressure inlet of the preheating regenerator 530, and the preheating regenerator 530 is connected to the low pressure inlet of the preheating regenerator. The low pressure outlet of the heat regenerator 530 is connected with the inlet of the compressor 510 and forms a complete circuit.

The heating pipeline is used to heat the fluid, and its connection mode is: the fluid inlet of the preheating regenerator 530 flows into the fluid to be heated, the fluid outlet of the preheating regenerator 530 is connected to the fluid inlet of the condensation/heater 520, and the condensation/heater 520 The fluid outlet is a thermal fluid outlet.

The working process of the cooling/heating system 50 is as follows: the refrigerant is compressed by the compressor 510 to form a high-pressure gas with a temperature of about 100° C. to 120° C., and is cooled by the condensation/heater 520 to form a vapor-liquid two-phase. The vapor-liquid separation is completed in the vapor-liquid separator 525, wherein the high-boiling-point working medium enters the low-pressure inlet of the preheating regenerator 530 after being throttled and depressurized by the third throttling element 535 at the liquid phase outlet of the vapor-liquid separator 525; The low-boiling point working fluid passes through the vapor phase outlet of the vapor-liquid separator 525 and further cools down in the preheating regenerator 530 and the subcooling regenerator 540 to become a subcooled liquid. The subcooled refrigerant becomes a low-pressure vapor-liquid two-phase state after being throttled by the first throttling element 550, and becomes a gas after absorbing heat in the evaporator 560, and then regenerates heat in the subcooling regenerator 540 and the preheating regenerator 530 The superheated gas enters the compressor 510 to complete the refrigeration cycle.

At the same time, the fluid to be heated enters the preheating regenerator 530 from the fluid inlet of the preheating regenerator 530, heats up in the preheating regenerator 530, and then enters the heat of the condensation/heater 520 to further raise the temperature to 99°C. The fluid then exits the fluid outlet of the condensing/heater 520. Specifically, the fluid to be heated may be water, and the hot fluid flowing out from the fluid outlet of the condensation/heater 520 may be domestic or drinking hot water.

Example 6

Please refer to FIG. 6 , the refrigeration/heating system 60 of this embodiment further includes a cold fluid heat exchanger 670 on the basis of the combined refrigeration/heating system 50 of the fifth embodiment. The refrigeration/heating system 60 also has a refrigeration pipeline. Refrigeration lines are used to produce cold fluids.

The connection method is: the cold fluid heat exchanger 670 is arranged between the evaporator 660 and the subcooling regenerator 640 . The outlet of the evaporator 660 is connected to the first inlet of the cold fluid heat exchanger 670 , and the first outlet of the cold fluid heat exchanger 670 is connected to the low pressure inlet of the subcooling regenerator 640 . The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger 670, and flows out from the second outlet of the cold fluid heat exchanger 670 after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid.

The working process is: the difference from the refrigeration/heating system 50 of Embodiment 5 is that the fluid to be cooled enters from the second inlet of the cold fluid heat exchanger 670, and after heat exchange, passes through the second outlet of the cold fluid heat exchanger 670 Drain and cool to desired temperature.

Example 7

Referring to FIG. 7 , the cooling/heating system 70 of this embodiment further includes a three-way switching valve 780 , a second throttling element 790 and a heat exchanger 795 on the basis of the composite cooling/heating system 50 of Embodiment 5.

At this time, the connection mode of the refrigeration cycle is: the refrigerant outlet of the condensing/heater 720 is connected to the inlet of the three-way switching valve 780, the first outlet of the three-way switching valve 780 is connected to the inlet of the gas-liquid separator 725, and the outlet of the three-way switching valve 780 is connected to the inlet of the three-way switching valve 780. The second outlet is connected to the inlet of the second throttling element 790, the outlet of the second throttling element 790 is connected to the inlet of the heat exchanger 795, and the outlet of the heat exchanger 795 is connected to the inlet of the compressor 710 to form a loop.

The working process of the cooling/heating system 70 is as follows: when the cooling and heating systems work simultaneously, switch the three-way switch valve 780 to connect the refrigerant outlet of the condensation/heater 720 with the inlet of the vapor-liquid separator 725, and close the three-way switching valve at the same time. Through the second outlet of the switching valve 780. The refrigerant is compressed by the compressor 710 to form a high-pressure gas with a temperature of about 100°C to 120°C. After being condensed/cooled by a heater, a vapor-liquid two-phase is formed, and the vapor-liquid separation is completed in the vapor-liquid separator 725, among which the high boiling point After the liquid phase outlet of the vapor-liquid separator 725 is throttled and depressurized by the third throttling element 735, it enters the low-pressure inlet of the preheating regenerator 730; The temperature in the preheating regenerator 730 and the subcooling regenerator 740 is further reduced to supercooled refrigerant, and the subcooled refrigerant becomes a low-pressure vapor-liquid two-phase state after being throttled by the first throttling element 750. After the evaporator absorbs heat, the supercooled refrigerant It becomes a gas, and then reheats in the subcooling regenerator 740 and the preheating regenerator 730 to become a superheated gas, and enters the compressor 710 to complete the refrigeration cycle. At the same time, the fluid to be heated enters the preheating regenerator 730 from the fluid inlet of the preheating regenerator 730, heats up in the preheating regenerator 730, and then enters the heat of the condensation/heater 720 to further raise the temperature to 99°C. The fluid then exits the fluid outlet of the condensing/heater 720. Specifically, the fluid to be heated may be water, and the hot fluid flowing out from the fluid outlet of the condensation/heater 720 may be domestic or drinking hot water.

When only the heating system is needed, switch the three-way switching valve 780 to connect the refrigerant outlet of the condensing/heater 720 with the second throttling element 790, and at the same time close the first outlet of the three-way switching valve 780, and the refrigerant gas is condensed After the heater 720 cools down, it enters the heat exchanger 795 through throttling and depressurization, where it absorbs the heat of the air and becomes a low-pressure gas, and then reenters the compressor 710 for compression to complete the cycle.

Example 8

Please refer to FIG. 8 , the refrigeration/heating system 80 of this embodiment further includes a cold fluid heat exchanger 870 on the basis of the combined refrigeration/heating system 70 of Embodiment 7. The refrigeration/heating system 80 also has a refrigeration pipeline. Refrigeration lines are used to produce cold fluids.

Its connection mode is: the cold fluid heat exchanger 870 is arranged between the evaporator 860 and the subcooling regenerator 840 . The outlet of the evaporator 860 is connected to the first inlet of the cold fluid heat exchanger 870 , and the first outlet of the cold fluid heat exchanger 870 is connected to the low pressure inlet of the subcooling regenerator 840 . The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger 870, and flows out from the second outlet of the cold fluid heat exchanger 870 after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid.

The working process is: the cooling/heating system 80 is different from the cooling/heating system 70 of Embodiment 7 in that the fluid at room temperature can be cooled to the required temperature through the cold fluid heat exchanger 870 .

In the above-mentioned embodiments 1-8, the condensation/heater can be filled with cold storage and heat storage materials. The evaporator can also be filled with cool and heat storage materials. The cold storage and heat storage materials can be phase change cold storage materials and non-phase change cold storage materials. The condensation/heater and the evaporator are filled with cold storage and heat storage materials, which can further play a role in energy saving.

The above-mentioned refrigeration/heating system raises the return air temperature of the compressor through high-efficiency heat recovery, and increases the discharge temperature of the compressor. It can generate hot fluid, especially domestic or drinking hot water, at the same time of cooling, and the water temperature can reach 99°C. Utilizing the refrigerant discharged from the compressor to heat the thermal fluid required for daily life can efficiently utilize electric energy, improve the utilization efficiency of electric energy into heat energy, and make the efficiency greater than 1. At the same time, it can effectively recover heat and reduce the impact on the environment. Thermal pollution The above refrigeration/heating systems are not only applicable to single medium vapor compression systems, but also to mixed working medium vapor compression systems.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (8)

1. A refrigeration and heating system, characterized in that it comprises a compressor, a condensation heater, a preheating regenerator, a subcooling regenerator, a first throttling element and an evaporator; The high-pressure outlet of the compressor is connected to the refrigerant inlet of the condensing heater, the refrigerant outlet of the condensing heater is connected to the high-pressure inlet of the preheating regenerator, and the high-pressure outlet of the preheating regenerator is connected to The high-pressure inlet of the subcooling regenerator, the high-pressure outlet of the subcooling regenerator is connected to the inlet of the first throttling element, and the outlet of the first throttling element is connected to the inlet of the evaporator, so The outlet of the evaporator is connected to the low-pressure inlet of the subcooling regenerator, the low-pressure outlet of the subcooling regenerator is connected to the low-pressure inlet of the preheating regenerator, and the low-pressure outlet of the preheating regenerator is connected to the The inlets of the compressors are connected to form a refrigeration cycle, and the evaporator can output cooling capacity to the outside; The condensing heater also includes a fluid inlet and a fluid outlet, the preheating regenerator also includes a fluid inlet and a fluid outlet, the fluid inlet of the preheating regenerator flows into the fluid to be heated, and the preheating regenerator The fluid outlet of the condensation heater is connected to the fluid inlet of the condensing heater, and the fluid outlet of the condensing heater is a hot fluid outlet, forming a fluid heating pipeline for heating the fluid; The refrigeration and heating system also includes a three-way switching valve, a second throttling element and a heat exchanger; The refrigerant outlet of the condensing heater is connected to the inlet of the three-way switching valve, the first outlet of the three-way switching valve is connected to the high-pressure inlet of the preheating regenerator, and the second outlet of the three-way switching valve is The outlet is connected to the inlet of the second throttling element, the outlet of the second throttling element is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the compressor to form a loop; The cooling and heating system also includes a cold fluid heat exchanger, the cold fluid heat exchanger is arranged between the evaporator and the subcooling regenerator, and the outlet of the evaporator is connected to the cold fluid heat exchanger. The first inlet of the heat exchanger, the first outlet of the cold fluid heat exchanger is connected to the low-pressure inlet of the subcooling regenerator; the fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and the heat exchange Afterwards, it flows out from the second outlet of the cold fluid heat exchanger to become cold fluid, forming a refrigeration pipeline for producing cold fluid. 2. The cooling and heating system according to claim 1, further comprising a cold fluid heat exchanger, the cold fluid heat exchanger being arranged between the evaporator and the subcooling regenerator, The outlet of the evaporator is connected to the first inlet of the cold fluid heat exchanger, and the first outlet of the cold fluid heat exchanger is connected to the low pressure inlet of the subcooling regenerator; The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and flows out from the second outlet of the cold fluid heat exchanger after heat exchange to become cold fluid, forming a refrigeration pipeline for producing cold fluid. 3. The cooling and heating system according to claim 1, further comprising a vapor-liquid separator and a third throttling element, the refrigerant outlet of the condensing heater is connected to the inlet of the vapor-liquid separator, The liquid phase outlet of the gas-liquid separator is connected to the inlet of the third throttling element, and the outlet of the third throttling element is connected to the low-pressure inlet of the preheating regenerator. The phase outlet is connected to the high-pressure inlet of the preheating regenerator. 4. The cooling and heating system according to claim 3, further comprising a cold fluid heat exchanger, the cold fluid heat exchanger being arranged between the evaporator and the subcooling regenerator, The outlet of the evaporator is connected to the first inlet of the cold fluid heat exchanger, and the first outlet of the cold fluid heat exchanger is connected to the low pressure inlet of the subcooling regenerator; The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and after exchanging heat, flows out from the second outlet of the cold fluid heat exchanger to become cold fluid and form a refrigeration pipeline for producing cold fluid. fluid. 5. The cooling and heating system according to claim 3, further comprising a three-way switching valve, a second throttling element and a heat exchanger; The refrigerant outlet of the condensing heater is connected to the inlet of the three-way switching valve, the first outlet of the three-way switching valve is connected to the inlet of the vapor-liquid separator, and the second outlet of the three-way switching valve is connected to The inlet of the second throttling element, the outlet of the second throttling element is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the compressor to form a loop. 6. The cooling and heating system according to claim 5, further comprising a cold fluid heat exchanger, the cold fluid heat exchanger being arranged between the evaporator and the subcooling regenerator, The outlet of the evaporator is connected to the first inlet of the cold fluid heat exchanger, and the first outlet of the cold fluid heat exchanger is connected to the low pressure inlet of the subcooling regenerator; The fluid to be refrigerated flows in from the second inlet of the cold fluid heat exchanger, and after exchanging heat, flows out from the second outlet of the cold fluid heat exchanger to become cold fluid and form a refrigeration pipeline for producing cold fluid. fluid. 7. The cooling and heating system according to any one of claims 1-6, characterized in that, the condensation heater is filled with cold and heat storage materials. 8. The cooling and heating system according to any one of claims 1-6, characterized in that, the evaporator is filled with cold and heat storage materials.