CN105485907A - High-efficiency single-stage restriction two-stage compression heat-pump water heater with large temperature rise - Google Patents
High-efficiency single-stage restriction two-stage compression heat-pump water heater with large temperature rise Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a high-efficiency single-stage restriction two-stage compression heat-pump water heater with a large temperature rise. An outlet of a high-pressure compressor communicates with a refrigerant inlet of a first condenser; one branch of a refrigerant outlet of the first condenser communicates with a first inlet of a subcooler through a first restricting device, and a gas outlet of the subcooler communicated with an inlet of the high-pressure compressor; the other branch of the refrigerant outlet of the first condenser communicates with a second inlet of the subcooler, and a liquid outlet of the subcooler communicates with an inlet of a low-pressure compressor through a third restricting device, a one-way valve, a second restricting device and an evaporator; an outlet of the low-pressure compressor is divided into two branches, wherein one branch communicates with a refrigerant inlet of a second condenser through a first stop valve and a refrigerant outlet of the second condenser communicates with an inlet of the second restricting device; and the other branch communicates with the inlet of the high-pressure compressor; moreover, a main cold water inlet communicates with the second condenser and the first condenser through a water pump, and a hot water outlet of the first condenser serves as a main hot water outlet. The high-efficiency single-stage restriction two-stage compression heat-pump water heater with the large temperature rise is capable of effectively reducing energy consumption, improving energy efficiency and increasing a working temperature zone.
Description
Technical field
The present invention relates to field of water heaters, especially a kind of Teat pump boiler.
Background technology
Cross swords in the fierceness of Paris weather summit and to shroud in overhead, North China haze crisis not loose for a long time and all telling that people's Environment and energy problem is day by day serious in various countries.The Teat pump boiler with energy-conserving and environment-protective has become the focus of research and apply, be widely used in the occasions such as hotel, hospital, school, domestic hot-water, industrial production, and market is in continuous expansion.But Teat pump boiler still needs to consume a large amount of electric energy after all, therefore improve its electrical efficiency and become an emphasis improved.In addition, in China, winter is generally cold, especially northwest, the Northeast's temperature can lower than-20 DEG C, now common Teat pump boiler efficiency sharply declines even cannot run and also seriously constrains its energy-saving effect.Therefore the operation stability and the working range that improve heat pump are also emphasis problems.
Summary of the invention
In order to overcome the deficiency that energy consumption is comparatively large, efficiency is lower, operation temperature area is wide not of existing Teat pump boiler, the invention provides the large efficiently temperature rise single-stage throttling two stages of compression Teat pump boiler of a kind of effective reduction energy consumption, improving energy efficiency, increase operation temperature area.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently, comprise high pressure compressor, low pressure compressor, first condenser, second condenser, subcooler and evaporimeter, the outlet of described high pressure compressor is communicated with the refrigerant inlet of described first condenser, one tunnel of the refrigerant outlet of described first condenser is communicated with the first entrance of described subcooler through first throttle device, the gas vent of described subcooler is communicated with the entrance of described high pressure compressor, another road of the refrigerant outlet of described first condenser is communicated with the second entrance of described subcooler, the liquid outlet of described subcooler with through the 3rd throttling arrangement, check valve is communicated with the entrance of the second throttling arrangement, the outlet of described second throttling arrangement is communicated with the entrance of described evaporimeter, the outlet of described evaporimeter is communicated with the entrance of described low pressure compressor, the outlet of described low pressure compressor is divided into two strands, one is communicated with through the refrigerant inlet of the first stop valve with the second condenser, the refrigerant outlet of described second condenser is communicated with the entrance of described second throttling arrangement, another stock-traders' know-how is crossed the second stop valve and is communicated with the entrance of high pressure compressor,
Total cooling water inlet is communicated with by the cooling water inlet of water pump with the second condenser, and the hot water outlet of described second condenser is communicated with the cooling water inlet of described first condenser, and the hot water outlet of described first condenser is total hot water outlet.
Further, the outlet of described evaporimeter is communicated with the entrance of gas-liquid separator, and the gas vent of described gas-liquid separator is communicated with the entrance of described low pressure compressor.
Further again, the outlet of described high pressure compressor is connected with the entrance of the first oil eliminator, the oil export of described first oil eliminator is communicated with the entrance of described high pressure compressor, and the refrigerant outlet of described first oil eliminator is communicated with the refrigerant inlet of described first condenser; The outlet of described low pressure compressor is connected with the entrance of the second oil eliminator, the oil export of described second oil eliminator is communicated with the entrance of described low pressure compressor, and the refrigerant outlet of described second oil eliminator is divided into two stocks not to be connected with the entrance of the first stop valve and the entrance of the second stop valve.
Further, between the refrigerant outlet of described second condenser and the entrance of described evaporimeter, defrost arm is set, described defrost arm installs the 3rd stop valve.
The outlet of described evaporimeter is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
Or: the gas vent of described second gas-liquid separator is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
Beneficial effect of the present invention is mainly manifested in:
1, adopt the throttling of two stages of compression two-stage, greatly extend the scope of application compared with single-stage heat pump, improve efficiency;
2, compare existing two stages of compression heat pump, have employed two-step heating hot water dexterously, when hot water temperature rise is larger, the wasted work of high pressure compressor can be greatly reduced, namely improve system energy efficiency further.Essentially, existing directly-heated type Teat pump boiler has larger heat transfer temperature difference and namely produces larger entropy product, cold water and hot water then can mix and causes larger entropy and produce equally by circulating heat pump water heater, and the present invention reduces above-mentioned entropy and produce, and improve the thermodynamics integrity of system;
3, most suitable pattern can be selected under different seasons, different external condition, promote seasonal energy efficiency to greatest extent, and ensure the stable operation of system.The simple pipeline of parts is flexible, switches the two stages of compression two-step heating pattern that how realizes, two stages of compression one-level heating mode, low-pressure stage compression single-stage heating mode, hiigh pressure stage compression single-stage heating mode and hot-gas bypass defrost pattern by a small amount of stop valve.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently.
Fig. 2 is the schematic diagram of another kind of large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently.
Fig. 3 is the schematic diagram of another efficient large temperature rise single-stage throttling two stages of compression Teat pump boiler.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 3, a kind of large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently, comprise high pressure compressor 1, low pressure compressor 10, first condenser 3, second condenser 13, subcooler 5 and evaporimeter 8, the outlet of described high pressure compressor 1 is communicated with the refrigerant inlet of described first condenser 3, one tunnel of the refrigerant outlet of described first condenser 3 is communicated with through first entrance of first throttle device 4 with described subcooler 5, the gas vent of described subcooler 5 is communicated with the entrance of described high pressure compressor 1, another road of the refrigerant outlet of described first condenser 3 is communicated with the second entrance of described subcooler 5, the liquid outlet of described subcooler 5 fills 19 through the 3rd throttling, check valve 6 is communicated with the entrance of the second throttling arrangement 7, the outlet of described second throttling arrangement 7 is communicated with the entrance of described evaporimeter 8, the outlet of described evaporimeter 8 is communicated with the entrance of described low pressure compressor 10, the outlet of described low pressure compressor 10 is divided into two strands, one is communicated with through the refrigerant inlet of the first stop valve 12 with the second condenser 13, the refrigerant outlet of described second condenser 13 is communicated with the entrance of described second throttling arrangement 7, another stock-traders' know-how is crossed the second stop valve 14 and is communicated with the entrance of high pressure compressor 1,
Total cooling water inlet is communicated with the cooling water inlet of the second condenser 13 by water pump 15, and the hot water outlet of described second condenser 13 is communicated with the cooling water inlet of described first condenser 3, and the hot water outlet of described first condenser 3 is total hot water outlet.
Further, the outlet of described evaporimeter 8 is communicated with the entrance of gas-liquid separator 9, and the gas vent of described gas-liquid separator 9 is communicated with the entrance of described low pressure compressor 10.
Further again, the outlet of described high pressure compressor 1 is connected with the entrance of the first oil eliminator 2, the oil export of described first oil eliminator 2 is communicated with the entrance of described high pressure compressor 1, and the refrigerant outlet of described first oil eliminator 2 is communicated with the refrigerant inlet of described first condenser 3; The outlet of described low pressure compressor 10 is connected with the entrance of the second oil eliminator 11, the oil export of described second oil eliminator 11 is communicated with the entrance of described low pressure compressor 10, and the refrigerant outlet of described second oil eliminator 11 is divided into two stocks not to be connected with the entrance of the first stop valve and the entrance of the second stop valve.
Further, between the refrigerant outlet of described second condenser 13 and the entrance of described evaporimeter 8, defrost arm is set, described defrost arm installs the 3rd stop valve 16.
The outlet of described evaporimeter is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
Or: the gas vent of described gas-liquid separator 9 is communicated with through the entrance of the 4th stop valve 17 with described high pressure compressor 1, the gas vent of described subcooler 5 is all connected with the entrance of the 5th stop valve 18 with the outlet of the second stop valve 14, and the outlet of the 5th stop valve 18 exports all be communicated with the entrance of described high pressure compressor 1, the 4th stop valve 17.
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 lower, required hot water temperature is higher again, and adopts this pattern when inlet water temperature is lower, and the first stop valve 12 and the second stop valve 14 are all opened, high pressure compressor 1, low pressure compressor 10 all run, and water pump 15 runs.The oil-containing gaseous refrigerant of HTHP exports outflow from high pressure compressor 1 and enters the first oil eliminator 2, lubricating oil in refrigerating agent containing oil is separated at the first oil eliminator and flows out from the oil export of the first oil eliminator 2 and gets back to suction port of compressor, the cold-producing medium of HTHP flows out from the refrigerant outlet of oil eliminator and enters the first condenser 3 refrigerant inlet exothermic condensation, the liquid refrigerant of high pressure flows out from the refrigerant outlet of the first condenser 3 and is divided into two-way, the first via becomes the gas-liquid mixed refrigerant of middle pressure and enters the first entrance of subcooler 5 after first throttle device 4, evaporation endothermic becomes gaseous state, gaseous refrigerant flows out from the gas vent of subcooler 5, second tunnel enter subcooler the second entrance and by excessively cold, cross cold after liquid refrigerant flow out from the liquid outlet of subcooler 5 and enter evaporimeter 8 absorbing environmental heat through the refrigerant air-liquid mixture becoming low-temp low-pressure after the 3rd throttling arrangement 19 mixes with the liquid refrigerant from the second condenser 13 after check valve 6 after the second throttling arrangement 7, then low-temp low-pressure gaseous refrigerant after heat absorption evaporation is inhaled into the entrance of low pressure compressor 10 through gas-liquid separator 9, the refrigerating agent containing oil of medium temperature and medium pressure is discharged from the outlet of low pressure compressor 10 and is entered the second oil eliminator 11, lubricating oil wherein flows out from the oil export of the second oil eliminator 11 entrance returning low pressure compressor 10, the cold-producing medium of medium temperature and medium pressure then flows out from the refrigerant outlet of the second oil eliminator 11 and is divided into two strands, one enters condensation heat release in the second condenser 13 through the first stop valve 12 and becomes the liquid refrigerant of middle pressure, with the refrigerant mixed exported from check valve 6 after flowing out from the refrigerant outlet of the second condenser 13, another road returns the entrance of high pressure compressor 1 after the second stop valve 14 with the refrigerant mixed from subcooler 5 gas vent.Cold water enters in the second condenser 13 and is tentatively heated after water pump 15, becomes middle warm water, and then enters the first condenser 3 and be further heated, and flows out supply user after becoming high-temperature-hot-water from the first condenser 3 water out.
In order to energy-saving effect of the present invention is described better, shown below is systematic simulation calculation result based on two stages of compression two-step heating pattern and with traditional single-stage heat pump and be representative with patent (200720039229.1) two stages of compression heat pump (comprise and spray enthalpy increasing heat pump) contrasts.During calculating, all parts is according to the conservation of mass and conservation of energy modeling, compressor isentropic efficiency adopts the (InternationalJournalofRefrigeration such as Navarro-Peris, 2013,36 (7)) equation proposed, ignore pipeline friction loss and leak heat, other setup parameters, in table 1, the results are shown in Table 2.
As can be known from the results of Table 2, COP of the present invention is the highest, higher than two stages of compression heat pump by 15.6%, exceeds 40.9% especially than traditional single-stage heat pump.
Table 1
Table 2
Two stages of compression two-step heating pattern: when environment temperature is lower, required hot water temperature is higher again, and adopts this pattern when inlet water temperature is more higher than environment temperature, first stop valve 12 is closed, second stop valve 14 is opened, and high pressure compressor 1, low pressure compressor 10 all run, and water pump 15 runs.Running is now compared with regular run mode, and because the first stop valve 12 is closed, the second condenser 13 does not work, from water pump 15 out cold water do not heated when the second condenser 13, but only to be heated in the first condenser 3.
Low-pressure stage compression single-stage heating mode: when environment temperature is relatively high, and adopt this pattern when required hot water temperature is normal.First stop valve 12 is opened, and the second stop valve 14 is closed, and high pressure compressor 1 cuts out, and low pressure compressor 10 runs, and water pump 15 runs.The refrigerating agent containing oil of HTHP is discharged from the outlet of low pressure compressor 10 and is entered the second oil eliminator 11, lubricating oil wherein flows out from the oil export of the second oil eliminator 11 entrance returning low pressure compressor 10, the cold-producing medium of medium temperature and medium pressure then flows out from the refrigerant outlet of the second oil eliminator 11 and enters through the first stop valve 12 liquid refrigerant that second condenser 13, condensation heat release becomes, the refrigerant air-liquid mixture becoming low-temp low-pressure after the refrigerant outlet outflow of the second condenser 13 after the second throttling arrangement 7 enters evaporimeter 8 absorbing environmental heat, low-temp low-pressure gaseous refrigerant after heat absorption evaporation is inhaled into the entrance of low pressure compressor 10 through the second gas-liquid separator 9.Cold water enters in the second condenser 13 and is heated after water pump 15, because the first condenser 3 does not work, is not heated when hot water flows through the first condenser 3, finally flows out supply user from the first condenser 3 water out.
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 frosting freeze outside evaporimeter, now needs to carry out defrost to the evaporimeter of heat pump water-heating machine.Therefore, the basis of Fig. 1 adds the 3rd stop valve 16 between the refrigerant outlet of the second condenser 2 and the entrance of evaporimeter 8, and connects with pipeline, hot-gas bypass defrosting function can be realized, heat pump water-heating machine can more stably be run.Except increasing defrost power, the function that this flow process can realize is the same with Fig. 1's, and the 3rd stop valve 16 keeps closing when realizing the pattern of Fig. 1.
Hot-gas bypass defrost pattern: the first stop valve 12 is opened, the second stop valve 14 is closed, the 3rd stop valve 16 is opened, and high pressure compressor 1 cuts out, and low pressure compressor 10 runs, and water pump 15 cuts out.The gaseous state refrigerating agent containing oil of HTHP is discharged from the outlet of low pressure compressor 10 and is entered the second oil eliminator 11, lubricating oil wherein flows out from the oil export of the second oil eliminator 11 entrance returning low pressure compressor 10, high temperature liquid refrigerant then flows out through the first stop valve 12 and the second condenser 13 from the refrigerant outlet of the second oil eliminator 11, because water pump 15 cuts out, second condenser 13 does not work, high temperature liquid refrigerant does not carry out heat exchange in the second condenser 13, high temperature liquid refrigerant enters evaporimeter 8 heat release after the refrigerant outlet of the second condenser 13 flows out after the 3rd stop valve 16, make the defrost of evaporimeter outer wall, cold-producing medium exports the entrance flowing out and be finally inhaled into low pressure compressor 10 after the second gas-liquid separator 9 from evaporimeter 8.
With reference to Fig. 3:
When environment temperature is relatively high, and required hot water temperature normal time, low pressure compressor 10 is adopted to carry out single stage compress heating mode in the embodiment of Fig. 1, and in Fig. 3, add the 4th stop valve 17 and the 5th stop valve 18, make also can adopt high pressure compressor 1 when carrying out single stage compress heating, because high pressure compressor 1 is different with cylinder dimensions from the rated power of low pressure compressor 10, therefore expand the heating power scope of single stage compress heating mode, also improve the utilization rate of high pressure compressor simultaneously.This flow process is except can realizing hiigh pressure stage compression single-stage heating mode, and also can realize all operational modes of Fig. 1 and Fig. 2, only the 4th stop valve 17 need be kept closing, the 5th stop valve 18 is held open.
Hiigh pressure stage compression single-stage heating mode: the first stop valve 12, second stop valve the 14, three stop valve the 16, five stop valve 18 is closed, and the 4th stop valve 17 is opened, and high pressure compressor 1 and water pump 15 are opened, and low pressure compressor 10 cuts out.The oil-containing gaseous refrigerant of HTHP exports outflow from high pressure compressor 1 and enters the first oil eliminator 2, lubricating oil in refrigerating agent containing oil is separated at the first oil eliminator and flows out from the oil export of the first oil eliminator 2 and gets back to suction port of compressor, the cold-producing medium of HTHP flows out from the refrigerant outlet of oil eliminator and enters the first condenser 3 refrigerant inlet exothermic condensation, the liquid refrigerant of high pressure flows out through subcooler 5 but not heat exchange from the refrigerant outlet of the first condenser 3, flow out after the 3rd throttling arrangement 19 with check valve 6 from the liquid outlet of subcooler 5 again, again through the second throttling arrangement 7, the refrigerant air-liquid mixture becoming low-temp low-pressure enters evaporimeter 8 absorbing environmental heat, then low-temp low-pressure gaseous refrigerant after heat absorption evaporation returns the entrance of high pressure compressor 1 through Section of four stop valve 17 through the second gas-liquid separator 9.Cold water flows through the second condenser 13 but does not heat after water pump 15, and then enters the first condenser 3 and heated, and flows out supply user after becoming high-temperature-hot-water from the first condenser 3 water out.
Claims (8)
1. an efficient large temperature rise single-stage throttling two stages of compression Teat pump boiler, it is characterized in that: comprise high pressure compressor, low pressure compressor, first condenser, second condenser, subcooler and evaporimeter, the outlet of described high pressure compressor is communicated with the refrigerant inlet of described first condenser, one tunnel of the refrigerant outlet of described first condenser is communicated with the first entrance of described subcooler through first throttle device, the gas vent of described subcooler is communicated with the entrance of described high pressure compressor, another road of the refrigerant outlet of described first condenser is communicated with the second entrance of described subcooler, the liquid outlet of described subcooler is through the 3rd throttling arrangement, check valve is communicated with the entrance of the second throttling arrangement, the outlet of described second throttling arrangement is communicated with the entrance of described evaporimeter, the outlet of described evaporimeter is communicated with the entrance of described low pressure compressor, the outlet of described low pressure compressor is divided into two strands, one is communicated with through the refrigerant inlet of the first stop valve with the second condenser, the refrigerant outlet of described second condenser is communicated with the entrance of described second throttling arrangement, another stock-traders' know-how is crossed the second stop valve and is communicated with the entrance of high pressure compressor,
Total cooling water inlet is communicated with by the cooling water inlet of water pump with the second condenser, and the hot water outlet of described second condenser is communicated with the cooling water inlet of described first condenser, and the hot water outlet of described first condenser is total hot water outlet.
2. large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently as claimed in claim 1, it is characterized in that: the outlet of described evaporimeter is communicated with the entrance of gas-liquid separator, the gas vent of described gas-liquid separator is communicated with the entrance of described low pressure compressor.
3. large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently as claimed in claim 1, it is characterized in that: the outlet of described high pressure compressor is connected with the entrance of the first oil eliminator, the oil export of described first oil eliminator is communicated with the entrance of described high pressure compressor, and the refrigerant outlet of described first oil eliminator is communicated with the refrigerant inlet of described first condenser; The outlet of described low pressure compressor is connected with the entrance of the second oil eliminator, the oil export of described second oil eliminator is communicated with the entrance of described low pressure compressor, and the refrigerant outlet of described second oil eliminator is divided into two stocks not to be connected with the entrance of the first stop valve and the entrance of the second stop valve.
4. large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently as claimed in claim 2, it is characterized in that: the outlet of described high pressure compressor is connected with the entrance of the first oil eliminator, the oil export of described first oil eliminator is communicated with the entrance of described high pressure compressor, and the refrigerant outlet of described first oil eliminator is communicated with the refrigerant inlet of described first condenser; The outlet of described low pressure compressor is connected with the entrance of the second oil eliminator, the oil export of described second oil eliminator is communicated with the entrance of described low pressure compressor, and the refrigerant outlet of described second oil eliminator is divided into two stocks not to be connected with the entrance of the first stop valve and the entrance of the second stop valve.
5. the large efficiently temperature rise single-stage throttling two stages of compression Teat pump boiler as described in one of Claims 1 to 4, it is characterized in that: between the refrigerant outlet of described second condenser and the entrance of described evaporimeter, defrost arm is set, described defrost arm installs the 3rd stop valve.
6. the large efficiently temperature rise single-stage throttling two stages of compression Teat pump boiler as described in one of Claims 1 to 4, it is characterized in that: the outlet of described evaporimeter is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
7. large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently as claimed in claim 5, it is characterized in that: the outlet of described evaporimeter is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
8. large temperature rise single-stage throttling two stages of compression Teat pump boiler efficiently as claimed in claim 2, it is characterized in that: the gas vent of described gas-liquid separator is communicated with the entrance of described high pressure compressor through the 4th stop valve, the gas vent of described subcooler is all connected with the entrance of the 5th stop valve with the outlet of the second stop valve, and the outlet of the 5th stop valve exports all be communicated with the entrance of described high pressure compressor, the 4th stop valve.
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| CN109798661A (en) * | 2018-04-11 | 2019-05-24 | 浙江工业大学 | The Teat pump boiler of multi-mode heating |
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| CN105485907B (en) | 2018-06-01 |
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Application publication date: 20160413 Assignee: Shandong and Yangxin energy Polytron Technologies Inc. Assignor: JIANG University OF TECHNOLOGY Contract record no.: X2023980042382 Denomination of invention: An Efficient High Temperature Rise Single Stage Throttling Two Stage Compression Heat Pump Water Heater Granted publication date: 20180601 License type: Common License Record date: 20230925 |
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