CN105485907B - A kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler - Google Patents

A kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler Download PDF

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CN105485907B
CN105485907B CN201510995976.1A CN201510995976A CN105485907B CN 105485907 B CN105485907 B CN 105485907B CN 201510995976 A CN201510995976 A CN 201510995976A CN 105485907 B CN105485907 B CN 105485907B
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outlet
entrance
valve
shut
condenser
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CN105485907A (en
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徐英杰
蒋宁
高增梁
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00Fluid heaters characterised by the use of heat pumps
    • F24H4/02Water heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/0052Details for air heaters

Abstract

A kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler, the outlet of high pressure compressor is connected with the refrigerant inlet of the first condenser, the refrigerant outlet of first condenser connects all the way by first throttling device with the first entrance of subcooler, the gas vent of subcooler is connected with the entrance of high pressure compressor, another way is connected with the second entrance of subcooler, the liquid outlet of subcooler passes through the 3rd throttling set, check valve, second throttling device, evaporator is connected with the entrance of low pressure compressor, its outlet is divided into two strands, one is connected by the first shut-off valve with the refrigerant inlet of the second condenser, the refrigerant outlet of second condenser is connected with the entrance of second throttling device;Another the second shut-off valve of stock-traders' know-how is connected with the entrance of high pressure compressor;Total cooling water inlet is connected by water pump with the second condenser, the first condenser, and the hot water outlet of the first condenser is total hot water outlet.It is of the invention effectively to reduce energy consumption, improving energy efficiency and increase operation temperature area.

Description

A kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler
Technical field
The present invention relates to field of water heaters, especially a kind of Teat pump boiler.
Background technology
It is not all being accused in the haze crisis not scattered for a long time in North China overhead of crossing swords and shroud of the fierceness of Paris weather summit various countries Tell people's environment and energy problem's getting worse.Become the hot spot of research and application with energy-saving and environment-friendly Teat pump boiler, The occasions such as hotel, hospital, school, domestic hot-water, industrial production are widely used to, and market is constantly expanding.However heat pump Water heater still needs to consume a large amount of electric energy after all, therefore improves its electrical efficiency as an improved emphasis.In addition, in China Winter is generally cold, especially northwest, the Northeast's temperature can be less than -20 DEG C, Teat pump boiler efficiency common at this time drastically under Drop can not even be run and also seriously constrain its energy-saving effect.Therefore it is also one to improve the operation stability of heat pump and working range A emphasis problem.
The content of the invention
In order to overcome the shortcomings of that the energy consumption of existing Teat pump boiler is larger, efficiency is relatively low, operation temperature area is not wide enough, the present invention A kind of effective energy consumption, improving energy efficiency, efficient big temperature of increase operation temperature area of reducing is provided and rises single-stage throttling two stages of compression heat pump Water heater.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler, including high pressure compressor, low pressure compressor, First condenser, the second condenser, subcooler and evaporator, the outlet of the high pressure compressor and the system of first condenser Cryogen entrance connects, the refrigerant outlet of first condenser all the way by the of first throttling device and the subcooler One entrance connects, and the gas vent of the subcooler is connected with the entrance of the high pressure compressor, the system of first condenser The another way of cryogen outlet is connected with the second entrance of the subcooler, and the liquid outlet of the subcooler by the 3rd with throttling Device, check valve are connected with the entrance of second throttling device, the outlet of the second throttling device and the entrance of the evaporator Connection, the outlet of the evaporator are connected with the entrance of the low pressure compressor, and the outlet of the low pressure compressor is divided into two strands, One is connected by the first shut-off valve with the refrigerant inlet of the second condenser, the refrigerant outlet of second condenser and institute State the entrance connection of second throttling device;Another stock-traders' know-how is crossed the second shut-off valve and is connected with the entrance of high pressure compressor;
Total cooling water inlet is connected by water pump with the cooling water inlet of the second condenser, the hot water outlet of second condenser It is connected with the cooling water inlet of first condenser, the hot water outlet of first condenser is total hot water outlet.
Further, the outlet of the evaporator is connected with the entrance of gas-liquid separator, and the gas of the gas-liquid separator goes out Mouth is connected with the entrance of the low pressure compressor.
Further, the outlet of the high pressure compressor is connected with the entrance of the first oil eliminator, the first oil separation The oil export of device is connected with the entrance of the high pressure compressor, the refrigerant outlet of first oil eliminator and described first cold The refrigerant inlet connection of condenser;The outlet of the low pressure compressor is connected with the entrance of the second oil eliminator, second oil The oil export of separator is connected with the entrance of the low pressure compressor, and the refrigerant outlet of second oil eliminator is divided into two strands The entrance with the entrance of the first shut-off valve and the second shut-off valve is connected respectively.
Further, defrost branch is set between the refrigerant outlet of second condenser and the entrance of the evaporator It manages, the 3rd shut-off valve is installed on the defrost branch pipe.
The outlet of the evaporator is connected by the 4th shut-off valve with the entrance of the high pressure compressor, the subcooler Entrance of the outlet of gas vent and the second shut-off valve with the 5th shut-off valve is connected, outlet and the high pressure of the 5th shut-off valve The entrance of compressor, the 4th cut-off valve outlet connect.
Either:The gas vent of second gas-liquid separator enters by the 4th shut-off valve and the high pressure compressor Entrance of the outlet of mouth connection, the gas vent of the subcooler and the second shut-off valve with the 5th shut-off valve is connected, the 5th section Only the outlet of valve is connected with entrance, the 4th cut-off valve outlet of the high pressure compressor.
Beneficial effects of the present invention are mainly manifested in:
1st, throttled using two stages of compression two-stage, greatly expand use scope compared with single-stage heat pump, improve efficiency;
2nd, compared to existing two stages of compression heat pump, two-step heating hot water is dexterously employed, it, can when hot water temperature rises larger To greatly reduce the wasted work of high pressure compressor, that is, further improve system energy efficiency.Essentially, existing directly-heated type It is to generate larger entropy production that Teat pump boiler, which has larger heat transfer temperature difference, and circulating heat pump water heater then can be by cold water and heat Water mixing equally causes larger entropy production, and the present invention reduces the production of above-mentioned entropy, improve the thermodynamics integrity of system;
3rd, most suitable pattern can be selected under different seasons, different external condition, promotes season to greatest extent Energy saving effect, and ensure the stable operation of system.The simple pipeline of component is flexible, and logical too small amount of cut-off Vavle switching how realizes two-stage Compression two-step heating pattern, two stages of compression level-one heating mode, low-pressure stage compression single-stage heating mode, hiigh pressure stage compression single-stage add Heat pattern and hot-gas bypass defrost pattern.
Description of the drawings
Fig. 1 is the schematic diagram that a kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler.
Fig. 2 is the schematic diagram that another efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler.
Fig. 3 is the schematic diagram that another efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
With reference to Fig. 1~Fig. 3, a kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler, including high pressure compressed Machine 1, low pressure compressor 10, the first condenser 3, the second condenser 13, subcooler 5 and evaporator 8, the high pressure compressor 1 Outlet is connected with the refrigerant inlet of first condenser 3, and the refrigerant outlet of first condenser 3 passes through all the way One throttling set 4 is connected with the first entrance of the subcooler 5, the gas vent of the subcooler 5 and the high pressure compressor 1 Entrance connection, the another way of the refrigerant outlet of first condenser 3 connects with the second entrance of the subcooler 5, institute It states the liquid outlet of subcooler 5 and fills 19, check valve 6 by the 3rd throttling and connected with the entrance of second throttling device 7, described second The outlet of throttling set 7 is connected with the entrance of the evaporator 8, outlet and the low pressure compressor 10 of the evaporator 8 Entrance connects, and the outlet of the low pressure compressor 10 is divided into two strands, one is by the first shut-off valve 12 and the second condenser 13 Refrigerant inlet connects, and the refrigerant outlet of second condenser 13 is connected with the entrance of the second throttling device 7;It is another Stock-traders' know-how is crossed the second shut-off valve 14 and is connected with the entrance of high pressure compressor 1;
Total cooling water inlet is connected by water pump 15 with the cooling water inlet of the second condenser 13, the heat of second condenser 13 Water out is connected with the cooling water inlet of first condenser 3, and the hot water outlet of first condenser 3 is total hot water outlet.
Further, the outlet of the evaporator 8 is connected with the entrance of gas-liquid separator 9, the gas of the gas-liquid separator 9 Outlet is connected with the entrance of the low pressure compressor 10.
Further, the outlet of the high pressure compressor 1 is connected with the entrance of the first oil eliminator 2, first oil Oil export from device 2 is connected with the entrance of the high pressure compressor 1, the refrigerant outlet of first oil eliminator 2 with it is described The refrigerant inlet connection of first condenser 3;The outlet of the low pressure compressor 10 is connected with the entrance of the second oil eliminator 11, The oil export of second oil eliminator 11 is connected with the entrance of the low pressure compressor 10, the system of second oil eliminator 11 Cryogen outlet is divided into entrance of two stocks not with the entrance of the first shut-off valve and the second shut-off valve and is connected.
Further, defrost is set between the refrigerant outlet of second condenser 13 and the entrance of the evaporator 8 Branch pipe installs the 3rd shut-off valve 16 on the defrost branch pipe.
The outlet of the evaporator is connected by the 4th shut-off valve with the entrance of the high pressure compressor, the subcooler Entrance of the outlet of gas vent and the second shut-off valve with the 5th shut-off valve is connected, outlet and the high pressure of the 5th shut-off valve The entrance of compressor, the 4th cut-off valve outlet connect.
Either:The gas vent of the gas-liquid separator 9 enters by the 4th shut-off valve 17 and the high pressure compressor 1 Entrance of the outlet of mouth connection, the gas vent of the subcooler 5 and the second shut-off valve 14 with the 5th shut-off valve 18 is connected, the The outlet of five shut-off valves 18 is exported and connected with entrance, the 4th shut-off valve 17 of the high pressure compressor 1.
The course of work of the present embodiment is:
With reference to Fig. 1:
Two stages of compression two-step heating pattern:When environment temperature is relatively low, required hot water temperature is again higher, and inlet water temperature It is opened with the second shut-off valve 14 using the pattern, the first shut-off valve 12 when relatively low, high pressure compressor 1, low pressure compressor 10 are equal Operation, water pump 15 are run.The oil-containing gaseous refrigerant of high temperature and pressure exits into the first oil eliminator from the outlet of high pressure compressor 1 2, the lubricating oil in refrigerating agent containing oil is separated in the first oil eliminator and is flowed out back from the oil export of the first oil eliminator 2 To suction port of compressor, the refrigerant of high temperature and pressure exits into 3 refrigerant of the first condenser from the refrigerant outlet of oil eliminator Entry exotherm condenses, and the liquid refrigerant of high pressure is divided into two-way from the refrigerant outlet outflow of the first condenser 3, and the first via is passed through Become the gas-liquid mixed refrigerant of middle pressure after first throttling device 4 and into the first entrance of subcooler 5, evaporation endothermic becomes gas State, gaseous refrigerant are flowed out from the gas vent of subcooler 5, and the second tunnel enters the second entrance of subcooler and is too cold, and is subcooled Liquid refrigerant afterwards is flowed out after the 3rd throttling set 19 and check valve 6 from the liquid outlet of subcooler 5 with coming from second Become after the liquid refrigerant mixing of condenser 13 after second throttling device 7 the refrigerant air-liquid mixture of low-temp low-pressure into Enter evaporator 8 and absorb amount of heat, the low-temp low-pressure gaseous refrigerant after heat absorption evaporation is then drawn by gas-liquid separator 9 The entrance of low pressure compressor 10, the refrigerating agent containing oil of medium temperature and medium pressure are discharged into the second oil separation from the outlet of low pressure compressor 10 Device 11, lubricating oil therein return to the entrance of low pressure compressor 10 from the oil export outflow of the second oil eliminator 11, and in medium temperature The refrigerant of pressure is then divided into two strands from the refrigerant outlet outflow of the second oil eliminator 11, one enters by the first shut-off valve 12 Heat release is condensed in second condenser 13 and becomes the liquid refrigerant of middle pressure, after the refrigerant outlet outflow of the second condenser 13 with The refrigerant mixing exported from check valve 6, another way is by the second shut-off valve 14 and the refrigeration from 5 gas vent of subcooler The entrance of high pressure compressor 1 is returned after agent mixing.Cold water, which enters after water pump 15 in the second condenser 13, tentatively to be heated, and is become It into middle warm water, then enters back into the first condenser 3 and is further heated, go out after becoming high-temperature-hot-water from 3 water of the first condenser Mouth outflow supply user.
In order to which the energy-saving effect of the present invention is better described, it is shown below and is based on two stages of compression two-step heating pattern System simulation result of calculation is simultaneously with traditional single-stage heat pump and hot for the two stages of compression of representative with patent (200720039229.1) Pump is compared (including spraying enthalpy increasing heat pump).During calculating, all parts are modeled according to the conservation of mass and the conservation of energy, compressor Isentropic efficiency using Navarro-Peris etc. (International Journal of Refrigeration, 2013,36 (7)) equation proposed, ignores pipeline friction loss and leakage heat, other setup parameters are shown in Table 1, the results are shown in Table 2.
As can be known from the results of Table 2, COP of the invention is highest, higher than two stages of compression heat pump by 15.6%, than traditional list Grade heat pump is even more to be higher by 40.9%.
Table 1
Table 2
Two stages of compression two-step heating pattern:When environment temperature is relatively low, required hot water temperature is again higher, and inlet water temperature Using the pattern when more higher than environment temperature, the first shut-off valve 12 is closed, and the second shut-off valve 14 is opened, high pressure compressor 1, low Pressure compressor 10 is run, and water pump 15 is run.Operational process at this time is compared with regular run mode, due to the first shut-off valve 12 It closes, the second condenser 13 do not work, and comes out when cold water passes through the second condenser 13 from water pump 15 and is not heated, but only the It is heated in one condenser 3.
Low-pressure stage compresses single-stage heating mode:Being used when environment temperature is relatively high, and required hot water temperature is normal should Pattern.First shut-off valve 12 is opened, and the second shut-off valve 14 is closed, and high pressure compressor 1 is closed, and low pressure compressor 10 is run, water pump 15 operations.The refrigerating agent containing oil of high temperature and pressure is discharged into the second oil eliminator 11 from the outlet of low pressure compressor 10, therein Lubricating oil returns to the entrance of low pressure compressor 10 from the oil export outflow of the second oil eliminator 11, and the refrigerant of medium temperature and medium pressure is then Become from the refrigerant outlet outflow of the second oil eliminator 11 by the first shut-off valve 12 into condensation heat release in the second condenser 13 Into liquid refrigerant, it is low after the outflow of the refrigerant outlet of the second condenser 13 after second throttling device 7 to become low temperature The refrigerant air-liquid mixture of pressure enters evaporator 8 and absorbs amount of heat, the low-temp low-pressure gaseous refrigerant warp after heat absorption evaporation Cross the entrance that the second gas-liquid separator 9 is inhaled into low pressure compressor 10.Cold water enters after water pump 15 in the second condenser 13 It is heated, since the first condenser 3 does not work, is not heated when hot water flows through the first condenser 3, finally from the first condenser 3 Water out outflow supply user.
With reference to Fig. 2:
When outdoor environment temperature is near or below 0 DEG C, evaporating temperature can reach less than 0 DEG C, may on the outside of evaporator Meeting frosting freezes, and needs to carry out defrost to the evaporator of heat pump water-heating machine at this time.Therefore, in the second condensation on the basis of Fig. 1 The 3rd shut-off valve 16 is added between the refrigerant outlet of device 2 and the entrance of evaporator 8, and is connected with pipeline, can realize heat Gas bypass defrosting function so that heat pump water-heating machine can more stably be run.In addition to increasing defrost power, this flow can be real Existing function is such as Fig. 1, and the 3rd shut-off valve 16 remains turned-off when realizing the pattern of Fig. 1.
Hot-gas bypass defrost pattern:First shut-off valve 12 is opened, the second shut-off valve 14 is closed, the 3rd shut-off valve 16 is opened, High pressure compressor 1 is closed, and low pressure compressor 10 is run, and water pump 15 is closed.The gaseous state refrigerating agent containing oil of high temperature and pressure is from low pressure pressure The outlet of contracting machine 10 is discharged into the second oil eliminator 11, and lubricating oil therein is returned from the oil export outflow of the second oil eliminator 11 Return the entrance of low pressure compressor 10, and high temperature liquid refrigerant is then from the outflow of the refrigerant outlet of the second oil eliminator 11 by the One shut-off valve 12 and the second condenser 13, since water pump 15 is closed, the second condenser 13 does not work, and high temperature liquid refrigerant does not exist It exchanges heat in second condenser 13, high temperature liquid refrigerant is after the refrigerant outlet outflow of the second condenser 13 by the 3rd Enter 8 heat release of evaporator after shut-off valve 16 so that evaporator outer wall defrost, refrigerant is from the outlet of evaporator 8 outflow by second The entrance of low pressure compressor 10 is finally inhaled into after gas-liquid separator 9.
With reference to Fig. 3:
When environment temperature is relatively high, and required hot water temperature is normal, low pressure compressor 10 is used in the embodiment of Fig. 1 Single stage compress heating mode is carried out, and the 4th shut-off valve 17 and the 5th shut-off valve 18 are added in Fig. 3 so that carries out single-stage pressure High pressure compressor 1 can also be used during contracting heating, due to the rated power of high pressure compressor 1 and low pressure compressor 10 and cylinder ruler Very little difference, therefore the heating power scope of single stage compress heating mode is expanded, while also improve the utilization of high pressure compressor Rate.This flow can also realize all operation moulds of Fig. 1 and Fig. 2 in addition to it can realize hiigh pressure stage compression single-stage heating mode Formula need to only remain turned-off the 4th shut-off valve 17, and the 5th shut-off valve 18 is kept it turned on.
Hiigh pressure stage compresses single-stage heating mode:First shut-off valve 12, the second shut-off valve 14, the 3rd shut-off valve 16, the 5th section Only valve 18 is closed, and the 4th shut-off valve 17 is opened, and high pressure compressor 1 is opened with water pump 15, and low pressure compressor 10 is closed.High temperature and pressure Oil-containing gaseous refrigerant exit into the first oil eliminator 2 from the outlet of high pressure compressor 1, the lubricating oil in refrigerating agent containing oil exists First oil eliminator is separated and outflows back to suction port of compressor from the oil export of the first oil eliminator 2, high temperature and pressure Refrigerant exits into 3 refrigerant inlet exothermic condensation of the first condenser, the liquid of high pressure from the refrigerant outlet of oil eliminator Refrigerant by subcooler 5 but does not exchange heat from the refrigerant outlet outflow of the first condenser 3, then the liquid outlet from subcooler 5 Outflow passes through second throttling device 7 after the 3rd throttling set 19 and check valve 6, becomes the refrigerant gas of low-temp low-pressure Liquid mixture enters evaporator 8 and absorbs amount of heat, and the low-temp low-pressure gaseous refrigerant after heat absorption evaporation is by the second gas-liquid point The entrance of high pressure compressor 1 is returned from device 9 and then by Section of four shut-off valve 17.Cold water flows through the second condensation after water pump 15 It device 13 but does not heat, then enters back into the first condenser 3 and heated, become after high-temperature-hot-water from 3 water out stream of the first condenser Go out to supply user.

Claims (8)

1. a kind of efficient big temperature rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:Including high pressure compressor, low Press compressor, the first condenser, the second condenser, subcooler and evaporator, the outlet of the high pressure compressor and described first Condenser refrigerant inlet connection, the refrigerant outlet of first condenser all the way by first throttling device with it is described The first entrance connection of subcooler, the gas vent of the subcooler are connected with the entrance of the high pressure compressor, and described first The another way of the refrigerant outlet of condenser is connected with the second entrance of the subcooler, and the liquid outlet of the subcooler passes through 3rd throttling set, check valve are connected with the entrance of second throttling device, the outlet of the second throttling device and the evaporation The entrance connection of device, the outlet of the evaporator are connected with the entrance of the low pressure compressor, the outlet of the low pressure compressor It is divided into two strands, one is connected by the first shut-off valve with the refrigerant inlet of the second condenser, the refrigeration of second condenser Agent outlet is connected with the entrance of the second throttling device;Another stock-traders' know-how crosses the second shut-off valve and the entrance of high pressure compressor connects It is logical;
Total cooling water inlet is connected by water pump with the cooling water inlet of the second condenser, the hot water outlet of second condenser and institute The cooling water inlet connection of the first condenser is stated, the hot water outlet of first condenser is total hot water outlet.
2. efficient big temperature as described in claim 1 rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:It is described The outlet of evaporator is connected with the entrance of gas-liquid separator, the gas vent of the gas-liquid separator and the low pressure compressor Entrance connects.
3. efficient big temperature as described in claim 1 rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:It is described The outlet of high pressure compressor is connected with the entrance of the first oil eliminator, the oil export of first oil eliminator and the high pressure pressure The entrance connection of contracting machine, the refrigerant outlet of first oil eliminator are connected with the refrigerant inlet of first condenser; The outlet of the low pressure compressor is connected with the entrance of the second oil eliminator, the oil export of second oil eliminator with it is described low The entrance connection of compressor is pressed, the refrigerant outlet of second oil eliminator is divided into entrance of two stocks not with the first shut-off valve And second shut-off valve entrance connection.
4. efficient big temperature as claimed in claim 2 rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:It is described The outlet of high pressure compressor is connected with the entrance of the first oil eliminator, the oil export of first oil eliminator and the high pressure pressure The entrance connection of contracting machine, the refrigerant outlet of first oil eliminator are connected with the refrigerant inlet of first condenser; The outlet of the low pressure compressor is connected with the entrance of the second oil eliminator, the oil export of second oil eliminator with it is described low The entrance connection of compressor is pressed, the refrigerant outlet of second oil eliminator is divided into entrance of two stocks not with the first shut-off valve And second shut-off valve entrance connection.
5. the efficient big temperature as described in one of Claims 1 to 4 rises single-stage throttling two stages of compression Teat pump boiler, feature exists In:Defrost branch pipe, the defrost branch pipe are set between the refrigerant outlet of second condenser and the entrance of the evaporator The 3rd shut-off valve of upper installation.
6. the efficient big temperature as described in one of Claims 1 to 4 rises single-stage throttling two stages of compression Teat pump boiler, feature exists In:The outlet of the evaporator is connected by the 4th shut-off valve with the entrance of the high pressure compressor, the gas of the subcooler The entrance of outlet and the outlet of the second shut-off valve with the 5th shut-off valve is connected, outlet and the high pressure compressed of the 5th shut-off valve The entrance of machine, the 4th cut-off valve outlet connect.
7. efficient big temperature as claimed in claim 5 rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:It is described The outlet of evaporator is connected by the 4th shut-off valve with the entrance of the high pressure compressor, the gas vent of the subcooler and Entrance of the outlet of two shut-off valves with the 5th shut-off valve is connected, the outlet of the 5th shut-off valve and entering for the high pressure compressor Mouth, the 4th cut-off valve outlet connect.
8. efficient big temperature as claimed in claim 2 rises single-stage throttling two stages of compression Teat pump boiler, it is characterised in that:It is described The gas vent of gas-liquid separator is connected by the 4th shut-off valve with the entrance of the high pressure compressor, the gas of the subcooler The entrance of outlet and the outlet of the second shut-off valve with the 5th shut-off valve is connected, outlet and the high pressure compressed of the 5th shut-off valve The entrance of machine, the 4th cut-off valve outlet connect.
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