CN211177515U - CO with multi-end low-temperature heat energy efficiently utilized2Transcritical air source heat pump system - Google Patents
CO with multi-end low-temperature heat energy efficiently utilized2Transcritical air source heat pump system Download PDFInfo
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- CN211177515U CN211177515U CN201921897971.5U CN201921897971U CN211177515U CN 211177515 U CN211177515 U CN 211177515U CN 201921897971 U CN201921897971 U CN 201921897971U CN 211177515 U CN211177515 U CN 211177515U
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Abstract
CO with multiple tail ends and low-temperature heat energy efficiently utilized2A transcritical air source heat pump system, said system comprising a heat pump cycle, a water cycle and a sanitary hot water cycle. The utility model discloses can enough guarantee indoor heating, can conveniently prepare sanitary hot water again, guarantee that the system stabilizes high-efficient operation throughout the year. The multi-end indoor heating system has the advantages that the low-temperature heating end and the high-temperature heating end are connected in series at the outlet of the water tank and are controlled through the 4 stop valves, the requirement on comfort of residents can be met, excessive waste can not be caused, and the two purposes are achieved. When the surface of the evaporator generates a frost layer in winter, the system can quickly defrost without being greatly influenced, and the system is ensured to normally operate in a reasonable working range. The utility model relates to a CO that many terminal low temperature heat energy high-efficient utilized2The trans-critical air source heat pump system can solve the problems of low efficiency and high defrosting cost of the existing heat pump.
Description
Technical Field
The utility model belongs to the heat pump relates to a directly-heated heat pump.
Background
The heat pump can transfer the heat of the low-temperature heat source to an object with the temperature higher than the environmental temperature by using a small amount of driving energy, and the conventional working media HCFC and HFC of the heat pump have the negative effects of destroying the ozone layer and intensifying the greenhouse effect and are not beneficial to sustainable development, so in recent years, CO (carbon monoxide)2The trans-critical air source heat pump becomes a key research and development object in the field of heat pumps. This is due to, on the one hand, CO2The working medium is more environment-friendly and is easy to obtain; on the other hand, the working medium in the air cooler is in a supercritical state, so that the air cooler is particularly suitable for preparing hot water with higher temperature through countercurrent heat exchange, and is energy-saving.
The temperature in winter in the north of China is often very low, and some rural areas often adopt coal fired boilers to heat, and in recent years, environmental and energy problems are more and more concerned, and the country also more and more attaches importance to environmental protection and energy conservation, and therefore, the air energy heat pump is popularized in a large quantity. The inlet and outlet temperatures of the common heat pump air heaters are low, so that the common heat pump air heaters have a good energy-saving effect, but dry hot air blown out during heating in winter often causes people to feel uncomfortable, indoor air is poor, and the comfort level of human bodies is reduced. Some high temperature heating are terminal, if radiator, warm up etc. adopt natural convection when heating, and the heat supply effect can be guaranteed again to no blowing sense, but need a large amount of pipe laying and reform transform, and simultaneously, the exit temperature ratio at high temperature heating end is bigger, and the heat pump high temperature heat source is in higher temperature for a long time, can lead to circulating system's throttle loss big, and the coefficient of performance is lower.
In the prior art, in order to solve the above problems, the available technical measures mainly include frequency conversion compression, cascade compression, adoption of binary or ternary mixed working medium, air supply and enthalpy increase under low-temperature working conditions and the like. These techniques are helpful for improving the efficiency of the heat pump, but cannot completely solve the problem, and part of the techniques have not been popularized in the household aspect, and in addition, the techniques can cause the complexity of the system more or less, which leads to the cost increase, and the cost is too high for small household, and the energy-saving significance is not great.
Disclosure of Invention
In order to overcome the defects of lower efficiency and higher defrosting cost of the existing heat pump, the utility model provides a CO which can improve the heat pump efficiency and reduce the defrosting cost and efficiently utilize multi-terminal low-temperature heat energy2A transcritical air source heat pump system.
The utility model provides a technical scheme that its technical problem adopted is:
CO with multiple tail ends and low-temperature heat energy efficiently utilized2A transcritical air source heat pump system comprises a compressor, a first air cooler, a second air cooler, a first throttling device, a second throttling device, a first filter, a second filter, an evaporator, a gas-liquid separator, a first stop valve, a second stop valve, a third stop valve, a first one-way valve and a second one-way valve, wherein an exhaust port of the compressor is respectively connected with an inlet of the first stop valve and an inlet of the third stop valve, an outlet of the first stop valve is connected with a first inlet of the first air cooler, a first outlet of the first air cooler is connected with a first inlet of the second air cooler, a first outlet of the second air cooler is connected with an inlet of the first filter, an outlet of the first filter is connected with an inlet of the first throttling device, an outlet of the first throttling device is connected with an inlet of the first one-way valve, and an outlet of the first one-way valve is connected with an inlet of the second filter, the export of second filter links to each other with the entry of evaporimeter, and the export of evaporimeter links to each other with the entry of vapour and liquid separator, and the first export of vapour and liquid separator links to each other with the entry of compressor, and the second export of vapour and liquid separator links to each other with the entry of second stop valve, and the export of second stop valve links to each other with the entry of compressor, and the export of third stop valve links to each other with second throttling arrangement entry, and second throttling arrangement export and entry link to each otherThe second filter inlet is connected.
Further, the heat pump further comprises a low-temperature heating end, a high-temperature heating end, a constant-temperature water tank, a water pump, a fourth stop valve, a fifth stop valve, a sixth stop valve and a seventh stop valve, wherein a second outlet of the first air cooler is connected with an inlet of the constant-temperature water tank, an outlet of the constant-temperature water tank is connected with an inlet of the fourth stop valve, a first interface of the fifth stop valve and an inlet of the sixth stop valve respectively, an outlet of the fourth stop valve is connected with an inlet of the high-temperature heating end, an outlet of the high-temperature heating end is connected with an inlet of the low-temperature heating end and a second interface of the fifth stop valve respectively, an outlet of the low-temperature heating end is connected with an inlet of the seventh stop valve, an outlet of the seventh stop valve is connected with an inlet of the water pump and an outlet of the sixth stop valve respectively.
Furthermore, the heat pump further comprises a sanitary hot water tank, the tap water interface is connected with a second inlet of the second air cooler, a second outlet of the second air cooler is connected with the sanitary hot water tank, and an outlet of the sanitary hot water tank is a sanitary hot water outlet.
Still further, the heat pump further includes an electric heating device disposed at a middle lower portion of the gas-liquid separator.
Furthermore, the heat pump also comprises a temperature sensor, a variable frequency fan and a control device, wherein the temperature sensor is positioned at the air side inlet of the evaporator and is connected with the control device; the variable frequency fan is also connected with the control device.
The technical conception of the utility model is as follows: the low-temperature heating tail end and the high-temperature heating tail end are connected in series, a common air heater is used as the low-temperature heating tail end, the heating radiator is used as the high-temperature heating tail end, the air heater can be installed in places such as a toilet, a kitchen and a storeroom which are not used for a long time, and the heating radiator can be installed on a bedroom floor which needs to be comfortable, so that the best heating comfort is guaranteed. Based on the principle of energy cascade utilization, high-temperature hot water is firstly used for heating through the heating plate and then is heated by the hot air heater to blow out hot air, so that the waste heat is reasonably utilized, the temperature of a high-temperature heat source of the heat pump is reduced, the operation condition of the heat pump is optimized, the power consumption of a compressor is reduced, and the performance coefficient of the system is improved. Meanwhile, the system improves a hot gas bypass defrosting system and is used for defrosting the heat pump as an improvement point of the system.
The utility model discloses still be equipped with the second air-cooler, the medium temperature high pressure gas through first air-cooler can further lower the temperature in the second air-cooler for thereby heating the running water and obtaining sanitary hot water, thereby further reduce the exhaust temperature and the pressure of compressor, improve the efficiency of system. The sanitary hot water does not need too high temperature (30 ℃ -45 ℃) and is arranged on the second air cooler for heating, thereby not only fully utilizing the waste heat, but also preparing the sanitary hot water, which can kill two birds with one stone.
The beneficial effects of the utility model are that:
1. when the system works and operates, particularly operates at low temperature in winter, compared with the common heat pump cycle, the energy efficiency coefficient COP of the system is higher, and the system is more energy-saving. The indoor heating is performed at the same temperature, the consumed electricity is less, and the efficiency is higher.
2. When the surface of the evaporator generates a frost layer in winter, the system can quickly defrost without being greatly influenced, and the system is ensured to normally operate in a reasonable working range.
3. System using CO2As a refrigerant, the heat pump is more environment-friendly, has higher efficiency than a common heat pump, has wide application range, is particularly suitable for heating in winter in the north, has obvious energy-saving effect and economic benefit, and has wide development prospect.
4. The waste heat discharged from the air cooler is effectively utilized, and multi-stage cooling is adopted, so that the indoor heating requirement can be met, and the hot water requirement of a toilet can also be met.
Drawings
FIG. 1 is CO with multi-end low-temperature heat energy efficient utilization2Drawings of a transcritical air source heat pump system, wherein 1: a compressor; 2: a first shut-off valve; 3: a first air cooler; 4: a second air cooler; 5: a first filter; 6: a first throttling device; 7: a first check valve; 8: a second filter; 9: an evaporator; 10: a gas-liquid separator; 11: a second stop valve; 12: a second one-way valve; 13: a third stop valve; 14: a second throttling device; 15: an electric heating device; 16: a constant temperature water tank; 17: a high temperature heating terminal; 18: a low temperature heating terminal; 20: a fourth stop valve; 21: a fifth stop valve; 22: a sixth stop valve; 23: a seventh stop valve; 26: a water pump; 27: a sanitary hot water tank; 28: a temperature sensor; 29: a variable frequency fan; 30: and a control device.
Fig. 2 is a drawing of the system without sanitary hot water installed, wherein 1: a compressor; 2: a first shut-off valve; 3: a first air cooler; 4: a second air cooler; 5: a first filter; 6: a first throttling device; 7: a first check valve; 8: a second filter; 9: an evaporator; 10: a gas-liquid separator; 11: a second stop valve; 12: a second one-way valve; 13: a third stop valve; 14: a second throttling device; 15: an electric heating device; 16: a constant temperature water tank; 17: a high temperature heating terminal; 18: a low temperature heating terminal; 20: a fourth stop valve; 21: a fifth stop valve; 22: a sixth stop valve; 23: a seventh stop valve; 26: a water pump; 28: a temperature sensor; 29: a variable frequency fan; 30: and a control device.
Fig. 3 is a drawing of the system with secondary low temperature heating terminal, wherein 1: a compressor; 2: a first shut-off valve; 3: a first air cooler; 4: a second air cooler; 5: a first filter; 6: a first throttling device; 7: a first check valve; 8: a second filter; 9: an evaporator; 10: a gas-liquid separator; 11: a second stop valve; 12: a second one-way valve; 13: a third stop valve; 14: a second throttling device; 15: an electric heating device; 16: a constant temperature water tank; 17: a high temperature heating terminal; 18: a low temperature heating terminal; 19: a secondary low temperature heating terminal; 20: a fourth stop valve; 21: a fifth stop valve; 22: a sixth stop valve; 23: a seventh stop valve; 24: an eighth stop valve; 25: a ninth cut-off valve; 26: a water pump; 27: a sanitary hot water tank; 28: a temperature sensor; 29: a variable frequency fan; 30: and a control device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 3, a multi-terminal CO for efficient utilization of low-temperature heat energy2A transcritical air source heat pump system comprises a compressor, a first air cooler, a second air cooler, a first throttling device, a second throttling device, a first filter, a second filter, an evaporator, a gas-liquid separator, a first stop valve, a second stop valve, a third stop valve, a first one-way valve and a second one-way valve, wherein an exhaust port of the compressor is respectively connected with an inlet of the first stop valve and an inlet of the third stop valve, an outlet of the first stop valve is connected with a first inlet of the first air cooler, a first outlet of the first air cooler is connected with a first inlet of the second air cooler, a first outlet of the second air cooler is connected with an inlet of the first filter, an outlet of the first filter is connected with an inlet of the first throttling device, an outlet of the first throttling device is connected with an inlet of the first one-way valve, and an outlet of the first one-way valve is connected with an inlet of the second filter, the export of second filter links to each other with the entry of evaporimeter, and the export of evaporimeter links to each other with vapour and liquid separator's entry, and vapour and liquid separator's first export links to each other with the entry of compressor, and vapour and liquid separator's second export links to each other with the entry of second stop valve, and the export of second stop valve links to each other with the entry of compressor, and the export of third stop valve links to each other with second throttling arrangement entry, and the export of second throttling arrangement links to each other with second filter entry.
Further, the heat pump further comprises a low-temperature heating end, a high-temperature heating end, a constant-temperature water tank, a water pump, a fourth stop valve, a fifth stop valve, a sixth stop valve and a seventh stop valve, wherein a second outlet of the first air cooler is connected with an inlet of the constant-temperature water tank, an outlet of the constant-temperature water tank is connected with an inlet of the fourth stop valve, a first interface of the fifth stop valve and an inlet of the sixth stop valve respectively, an outlet of the fourth stop valve is connected with an inlet of the high-temperature heating end, an outlet of the high-temperature heating end is connected with an inlet of the low-temperature heating end and a second interface of the fifth stop valve respectively, an outlet of the low-temperature heating end is connected with an inlet of the seventh stop valve, an outlet of the seventh stop valve is connected with an inlet of the water pump and an outlet of the sixth stop valve respectively.
Furthermore, the heat pump further comprises a sanitary hot water tank, the tap water interface is connected with a second inlet of the second air cooler, a second outlet of the second air cooler is connected with the sanitary hot water tank, and an outlet of the sanitary hot water tank is a sanitary hot water outlet.
Still further, the heat pump further includes an electric heating device disposed at a middle lower portion of the gas-liquid separator.
Furthermore, the heat pump also comprises a temperature sensor, a variable frequency fan and a control device, wherein the temperature sensor is positioned at the air side inlet of the evaporator and is connected with the control device; the variable frequency fan is also connected with the control device.
Example 1: and (4) a normal working mode.
As shown in FIG. 1, the normal operation mode of the system has two cycles, a heat pump cycle and a water cycle. In the water circulation system under the normal operating mode, the fifth stop valve 21, the sixth stop valve 22 are closed, the fourth stop valve 20, the seventh stop valve 23 are opened, the high temperature heating end 17 and the low temperature heating end 18 are connected and are respectively positioned in different rooms, the high temperature heating end and the low temperature heating end are connected in series to work, the heat emitted from the air cooler 3 is absorbed, and indoor heating is performed. The low temperature heating end (such as a floor radiation heating end) can be arranged in a toilet, a kitchen, a storeroom and the like which are not used for a long time, and the high temperature heating end (such as a radiator) can be arranged in a bedroom which needs to ensure the comfort, so as to ensure the best heating comfort. The high-temperature hot water firstly passes through the high-temperature heating end and then passes through the low-temperature heating end, the waste heat is reasonably utilized, and the temperature of a high-temperature heat source of the heat pump is reduced, so that the energy efficiency coefficient of the system can be improved. At the same time, the second air cooler 4 is also in operation, and the tap water is continuously heated to produce sanitary hot water, which is also removed from the water tank 27 as shown in fig. 2. Compared with the heating device which only uses heat pump heating radiators in some cities, the energy-saving heating device saves much energy, and is not to say that the heating furnace or the electric heater has lower energy efficiency.
Example 2: low temperature heating end working mode or high temperature heating end working mode
As shown in fig. 1, a resident may be in a room in special circumstances and it is not necessary to have both heaters active. The utility model discloses installed two heating equipment of 4 check-valve control additional in water circulating system. For example, the fourth and sixth stop valves are closed and the fifth and seventh stop valves are opened only when the low-temperature heating end is required to operate and the high-temperature heating end is not required to operate. Meanwhile, the second air cooler is also operated to continuously heat tap water to produce sanitary hot water, which is also omitted from fig. 2. This design ensures that the system operates in the most energy efficient mode.
Example 3: hot gas bypass defrosting mode
As shown in fig. 1, when the temperature of the surface of the evaporator 9 is lower than the dew point temperature of the air, water vapor in the air gradually condenses on the surface of the evaporator to form a frost layer, which is a very common phenomenon in the winter season in the north. The utility model discloses be used for many terminal low temperature heat energy high-efficient CO that utilizes with steam bypass defrosting system2When the working is influenced by the fact that the frost layer on the evaporator is too thick, the fourth stop valve is closed, the fifth stop valve is opened, and at the moment, high-temperature CO discharged from the compressor 12The refrigerant flows through the fifth stop valve and directly enters the air-cooled evaporator for defrosting, and the CO after heat exchange2After passing through the gas-liquid separator 10, the refrigerant enters the compressor, completing the cycle.
In the normal course of operation of system, oil in the compressor can dissolve and run out from the compressor in the refrigerant, separates out in vapour and liquid separator at last, along with the work of system, oil in the compressor can be less and less, can make the system have no way normal operating to lead to the burnout of compressor even, consequently, the utility model discloses install electric heater unit 15 in vapour and liquid separator's well lower part, set for a period and let it regularly heat, the bottom has connect back oil pipe way, along with electric heater's heating, oil can dissolve in refrigerant liquid through second stop valve 11 flow back to the compressor in, guarantees that the compressor works under safe environment.
Example 4: heating sanitary hot water mode
The system is provided with a second air cooler 4 for the purpose of producing sanitary hot water. The medium-temperature high-pressure gas passing through the first air cooler is further cooled in the second air cooler for heating tap water to obtain sanitary hot water. The sanitary hot water tank 24 is installed in a bathroom, and hot water is continuously stored in the hot water tank along with indoor heating in the daytime, so that the sanitary hot water tank can be used by residents at any time. If the householder does not need sanitary hot water, or the outdoor temperature is too low in winter, the hot water with enough temperature can not be obtained, the structure in the figure 2 can be adopted, the sanitary hot water module is removed, and the indoor heating is ensured to be sufficient. If the resident urgently needs to use the sanitary hot water, the water pump 26 can be turned off, so that the sanitary hot water can be quickly prepared.
Example 5: multi-stage heating mode
As shown in fig. 3, the system is additionally provided with a secondary low-temperature heating terminal 19 and two stop valves on the basis of the original system, further subdivides the temperature of the heat source provided by the heat pump, reduces the lower limit of the temperature of the heat source, and performs fine utilization, thereby improving the efficiency of the heat pump. By analogy, the heating tail end can be divided into more stages in principle, the energy efficiency coefficient COP is further improved on the original basis, the specific stage can be changed according to the environmental temperature and the economic condition, and the working condition of the system is greatly improved.
Example 6: mode for preparing hot water in summer
In summer, the household does not need a heating mode, and only needs to provide a certain amount of daily domestic hot water by the system, namely the structure in fig. 2 is adopted. Because the working conditions of all parts of the system are designed based on the condition of 20 ℃ below zero in winter, the compressor consumes too much power and burns out due to overhigh evaporation temperature in summer. Therefore, the system is provided with a temperature sensor at the air side inlet of the evaporator and is connected with a control device, and the other end of the control device is connected with a variable frequency fan of the evaporator. When the air temperature exceeds a set value, the control device controls the rotating speed of the variable frequency fan to be reduced, the temperature difference of the evaporator is increased, and the temperature of the refrigerant in the evaporator is reduced, so that the power consumption of the compressor is reduced. The system is ensured to operate under reasonable and safe conditions.
Claims (5)
1. CO with multiple tail ends and low-temperature heat energy efficiently utilized2The transcritical air source heat pump system is characterized by comprising a compressor, a first air cooler, a second air cooler, a first throttling device, a second throttling device, a first filter, a second filter, an evaporator, a gas-liquid separator, a first stop valve, a second stop valve, a third stop valve, a first one-way valve and a second one-way valve, wherein an exhaust port of the compressor is respectively connected with an inlet of the first stop valve and an inlet of the third stop valve, an outlet of the first stop valve is connected with a first inlet of the first air cooler, a first outlet of the first air cooler is connected with a first inlet of the second air cooler, a first outlet of the second air cooler is connected with an inlet of the first filter, an outlet of the first filter is connected with an inlet of the first throttling device, an outlet of the first throttling device is connected with an inlet of the first one-way valve, and an outlet of the first one-way valve is connected with an inlet of the second filter, the export of second filter links to each other with the entry of evaporimeter, and the export of evaporimeter links to each other with vapour and liquid separator's entry, and vapour and liquid separator's first export links to each other with the entry of compressor, and vapour and liquid separator's second export links to each other with the entry of second stop valve, and the export of second stop valve links to each other with the entry of compressor, and the export of third stop valve links to each other with second throttling arrangement entry, and the export of second throttling arrangement links to each other with second filter entry.
2. The multi-terminal low temperature thermal energy efficient CO of claim 12The transcritical air source heat pump system is characterized by further comprising a low-temperature heating end, a high-temperature heating end, a constant-temperature water tank, a water pump, a fourth stop valve, a fifth stop valve, a sixth stop valve and a seventh stop valve, wherein the second outlet of the first air cooler is connected with the inlet of the constant-temperature water tank, the outlet of the constant-temperature water tank is respectively connected with the inlet of the fourth stop valve, the first interface of the fifth stop valve and the inlet of the sixth stop valve, the outlet of the fourth stop valve is connected with the inlet of the high-temperature heating end, and high-temperature water is collectedThe outlet of the warm end is connected with the inlet of the low-temperature heating end and the second interface of the fifth stop valve respectively, the outlet of the low-temperature heating end is connected with the inlet of the seventh stop valve, the outlet of the seventh stop valve is connected with the inlet of the water pump and the outlet of the sixth stop valve respectively, and the outlet of the water pump is connected with the second inlet of the first air cooler.
3. CO for high-efficiency utilization of multi-terminal low-temperature thermal energy as claimed in claim 1 or 22The trans-critical air source heat pump system is characterized by further comprising a sanitary hot water tank, a tap water interface is connected with a second inlet of the second air cooler, a second outlet of the second air cooler is connected with the sanitary hot water tank, and an outlet of the sanitary hot water tank is a sanitary hot water outlet.
4. CO for high-efficiency utilization of multi-terminal low-temperature thermal energy as claimed in claim 1 or 22The trans-critical air source heat pump system is characterized by further comprising an electric heating device, wherein the electric heating device is arranged at the middle lower part of the gas-liquid separator.
5. CO for high-efficiency utilization of multi-terminal low-temperature thermal energy as claimed in claim 1 or 22The transcritical air source heat pump system is characterized by further comprising a temperature sensor, a variable frequency fan and a control device, wherein the temperature sensor is positioned at an air side inlet of the evaporator and connected with the control device; the variable frequency fan is also connected with the control device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921897971.5U CN211177515U (en) | 2019-11-06 | 2019-11-06 | CO with multi-end low-temperature heat energy efficiently utilized2Transcritical air source heat pump system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921897971.5U CN211177515U (en) | 2019-11-06 | 2019-11-06 | CO with multi-end low-temperature heat energy efficiently utilized2Transcritical air source heat pump system |
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| CN211177515U true CN211177515U (en) | 2020-08-04 |
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| CN201921897971.5U Active CN211177515U (en) | 2019-11-06 | 2019-11-06 | CO with multi-end low-temperature heat energy efficiently utilized2Transcritical air source heat pump system |
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