Curtain wall integrated heat pump system and method combining photocatalysis and heat recovery

Abstract

The invention belongs to but is not limited to the technical field of building energy conservation, and discloses a curtain wall integrated heat pump system and method combining photocatalysis and heat recovery, and the curtain wall integrated heat pump system comprises a photocatalysis system, a heat pump system, a ventilation system coupled with the photocatalysis system and the heat pump system, and a heat recovery system for the ventilation system. The photocatalysis system comprises a glass curtain wall, a photovoltaic panel, a fan, a TiO2 photocatalysis layer and an irradiation lamp. The heat pump system comprises a compressor, an evaporator, a condenser, an electronic expansion valve and a hot gas bypass pipeline. The ventilation system comprises an outdoor fresh air pipe, an indoor exhaust pipe, a recirculation air pipe, an indoor air supply pipe, an indoor waste gas pipe, a bypass pipeline, a preheater and an air filter. According to the system, the photocatalysis technology, heat recovery and the integrated curtain wall heat pump are combined, the energy consumption of a building is reduced, the energy utilization efficiency is improved, more efficient and more environment-friendly air purification and regulation functions are achieved, and a feasible scheme is provided for energy-saving transformation and renovation of the building.

Description

Technical Field

[0001] The present invention belongs to but is not limited to the field of building energy-saving technology, and in particular relates to a curtain wall integrated heat pump system and method combining photocatalysis and heat recovery. Background Art

[0002] With the intensification of global climate change and the increasing shortage of energy resources, building energy conservation has become a global focus. As one of the main areas of energy consumption, the energy efficiency level of buildings is directly related to the sustainable development of society and environmental protection. However, many old buildings did not fully consider energy conservation factors at the beginning of their design, resulting in high energy consumption and low energy efficiency, which not only increased operating costs but also aggravated environmental pollution. Therefore, there is great potential for energy-saving renovation of these buildings, but at the same time, how to simplify renovation measures and reduce costs has become a key issue.

[0003] At the same time, Trombe wall, as an effective passive building energy-saving technology, can be coupled with ventilation system and combined with photocatalysis to degrade volatile organic compounds in the air, further improving air quality and indoor comfort. However, there are still few applications and research on this aspect.

[0004] Due to the limitation of building space, low renovation efficiency, and coordination between residents on the use of air conditioning, the renovation plan of central air conditioning system is not feasible. Relatively speaking, heat pumps do not need cooling towers and other equipment, can be arbitrarily reduced in size, and can be compactly integrated on the curtain wall. Combined with ventilation, cooling and heating, hot water preparation and other functions, they are efficient, energy-saving, and plug-and-play. They have received widespread attention in recent years and are a distributed solution. However, due to the reduction in the scale of heat pumps, the heating capacity and system efficiency will also be reduced. The ventilation system can be coupled with the heat pump system, using indoor exhaust as a heat source to improve the efficiency of the heat pump, but at the same time the air circulation and heating power are limited.

[0005] In view of the above analysis, how to ensure stable and sufficient heating or cooling power, how to improve ventilation and maintain air hygiene conditions, and how to improve the energy efficiency of the entire system are all issues that need to be urgently addressed when applying the heat pump system. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention proposes a curtain wall integrated heat pump system and method combining photocatalysis and heat recovery, aiming to improve the air purification capacity through photocatalysis technology, promote ventilation by using glass curtain walls, and improve energy utilization efficiency by using heat recovery technology, thereby achieving a more efficient and environmentally friendly heating and ventilation process.

[0007] The present invention is achieved by a curtain wall integrated heat pump system combining photocatalysis and heat recovery, comprising a photocatalytic system, a heat pump system, a ventilation system coupled with the heat pump system, and a heat recovery system for the ventilation system;

[0008] The photocatalytic system includes a glass curtain wall, a photovoltaic panel, a fan, a TiO2 photocatalytic layer, and an irradiation lamp; the glass curtain wall is connected to the inner wall and then connected to the heat pump system integrated in the inner curtain wall; the photovoltaic panel is placed on the outer glass plate to make full use of light energy for power supply. The fan is installed at the top and bottom of the curtain wall cavity, and is located at the air outlet on the inner side of the curtain wall to promote air flow; the TiO2 photocatalytic layer is evenly laid on the walls on both sides of the inner side of the glass curtain wall in the form of a plate with a certain inclination; the irradiation lamp is installed on the upper and lower sides of the inner side of the curtain wall;

[0009] The heat pump system is a micro heat pump, comprising a compressor, an evaporator, a condenser, an electronic expansion valve and a hot gas bypass pipeline;

[0010] The ventilation system includes an outdoor fresh air duct, an indoor exhaust duct, a recirculating air duct, an indoor air supply duct, an indoor waste air duct, a bypass duct, a preheater and an air filter; the outdoor fresh air duct introduces purified air from the photocatalytic system, and the duct is connected to the fan, the preheater and the air filter in sequence, one branch is connected to the heat recovery system, and the air valve is placed in front of the heat recovery system, and the other branch is connected to the bypass duct and leads to the indoor air supply duct, and the bypass valve is located at the entrance of the bypass duct; the indoor exhaust duct draws out polluted air from the room, passes through the air filter, and is connected to the heat recovery system; the recirculating air duct is connected from the room, passes through the fan and finally enters the air mixing place; the air supply duct starts from the heat recovery system, passes through the air mixing place, the fan, the compressor, the condenser, the preheater in sequence and finally connects to the room; the waste air duct is connected from the heat recovery system, passes through the fan and the evaporator in sequence, one branch is connected to the air inlet on the inside of the photocatalytic system, and the other branch directly leads to the outdoors, and both branches are equipped with air valves.

[0011] Furthermore, the glass curtain wall is provided with air outlets and air inlets on the inside and outside. The outer air outlet exchanges air with the external environment; the inner air supply outlet is connected to the integrated heat pump system air outlet to provide fresh air to the room or receive exhaust gas from the room; each air outlet is equipped with a control air valve.

[0012] Furthermore, the compressor can be a variable frequency compressor to improve the heating capacity at low temperatures; and the compressor is located in the indoor part of the heat pump, allowing the air delivered to the room to pass through, making full use of the waste heat of the compressor and improving the heating efficiency.

[0013] Furthermore, a hot gas bypass method is used for defrosting, a bypass branch is led out from the exhaust port of the compressor to allow high-temperature steam to reach the evaporator side for defrosting, and a bypass valve is located on the branch to control the defrosting process.

[0014] Furthermore, the heat pump system uses the exhaust gas discharged from the room as a heat source to increase the evaporation temperature and make full use of the heat in the exhaust gas.

[0015] Furthermore, the heat recovery system selects membrane heat recovery to fully utilize the enthalpy value of the exhaust gas. At the same time, the recovery of moisture can introduce more fresh air, increase heating power, and improve system efficiency.

[0016] Furthermore, during winter heating, valves two, five and seven are closed, and valves one, three, four and six are opened. Outdoor fresh air enters through the glass curtain wall, and exhaust gas is passed into the glass curtain wall. After photocatalytic purification, the fresh air duct connected to the integrated heat pump system conducts full heat exchange with the indoor exhaust air. The fresh air is mixed with the circulating air and then delivered to the room through the heat released by the compressor and condenser; the exhaust gas becomes exhaust gas after heat recovery and is passed into the evaporator as a heat source; when the photocatalytic effect is sufficient, the valve can be closed to reduce heat loss.

[0017] Furthermore, in summer cooling, valves 5 and 7 are closed, and valves 1, 2, 3, 4, and 6 are opened. Outdoor fresh air enters through the glass curtain wall, and exhaust gas is passed into the glass curtain wall. Part of the air is passed to the outside through the air outlet to take away part of the heat. The fresh air after photocatalytic purification is passed into the heat pump system through the air inlet. The fresh air after heat recovery is mixed with the recycled air, and then passed into the room after absorbing heat through the evaporator. The indoor exhaust gas is converted into exhaust gas through the condenser after heat recovery, and the condensation temperature rises.

[0018] Furthermore, during the transition season, valves 2, 4, and 6 are closed, valves 1, 3, 5, and 7 are opened, and the heat pump stops running. The outdoor fresh air is purified by the photocatalyst and then introduced into the fresh air duct of the heat pump system, and then passed through the filter into the bypass duct and then connected to the air supply duct to directly supply air to the room. The indoor exhaust air is directly discharged to the outside through another branch of the exhaust pipe.

[0019] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0020] First, the present invention improves energy efficiency and system heating capacity: The present invention combines passive heating with active heating technology. First, the passive heat absorption and heat storage function of the glass curtain wall is used to fully utilize solar energy for space heating. Secondly, the exhaust gas with higher indoor temperature is used as a heat source to increase the evaporation temperature and combined with the membrane heat recovery function of the heat pump. The system can recover waste heat from the exhaust gas and compressor, and then use this waste heat to provide auxiliary energy for the heat pump system, and more outdoor fresh air can be used for heating, thereby improving the heating capacity of the system and the overall energy efficiency.

[0021] The invention is environmentally friendly and energy-saving and emission-reducing: Photocatalytic technology can use sunlight or other light sources to catalytically decompose pollutants in the air, such as nitrogen oxides and volatile organic compounds (VOCs), etc., which helps to improve indoor air quality and reduce environmental pollution. Combined with heat recovery and high-efficiency heat pump systems, the system can significantly reduce building energy consumption and carbon emissions, which is in line with the current concept of green buildings and sustainable development.

[0022] The present invention improves indoor comfort: photocatalytic technology can effectively purify indoor air, reduce the concentration of allergens and harmful substances, and provide residents with a healthier and more comfortable indoor environment. The coupling of the photocatalytic system, ventilation system and heat pump system can adopt the optimal adjustment and operation mode in summer, winter and transition season according to the indoor and outdoor temperature difference, maintain the stability and comfort of the indoor environment, and minimize the building energy consumption.

[0023] Second, as auxiliary evidence of the inventiveness of the present invention, it is also reflected in the following four important aspects:

[0024] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are:

[0025] The photocatalytic system can effectively degrade organic matter in the air, improve indoor air quality, and meet the needs of modern people who pursue a healthy and comfortable living environment. The combination of the heat recovery system and the exhaust gas heat source heat pump improves energy utilization efficiency, conforms to the current trend of green, low-carbon, and sustainable development, reduces the energy consumption of buildings, and reduces the operating costs of the system. The heat pump system is integrated on the curtain wall and can be plug-and-play. It has great application potential in the field of energy-saving transformation of buildings and can significantly reduce the cost and difficulty of building renovation.

[0026] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad:

[0027] At present, although there are separate photocatalytic air purification systems, heat recovery systems and curtain wall heat pump systems on the market, there is still a lack of an integrated system that cleverly combines the three. The technical solution of the present invention not only achieves the synergy of air purification, heat recovery and heat pump functions by innovatively integrating photocatalytic technology, heat recovery technology and integrated curtain wall heat pump technology, but also optimizes the overall performance and energy utilization efficiency of the system. This innovative technical solution fills the gap in this field at home and abroad, and provides a new technical path and solution for energy conservation, emission reduction and sustainable development in the construction industry.

[0028] (3) The technical solution of the present invention solves the technical problems that people have been eager to solve but have never been able to solve successfully:

[0029] General heat pump systems usually rely on ambient air as a heat source, but its temperature is often low, which limits the efficiency of the heat pump system. This system, by combining heat recovery technology, can recover waste heat from the air inside the building, and use exhaust gas as a high-temperature heat source for the heat pump system, which can reduce energy consumption, improve the heating efficiency of the heat pump system, and solve the efficiency limitation problem of the integrated heat pump. Combining the photocatalytic curtain wall with the heat pump system not only achieves efficient energy utilization, but also solves the ventilation problem of the curtain wall integrated heat pump, ensuring indoor air quality and living comfort. The technical solution of the present invention realizes the integration of air purification, energy recovery and high-efficiency heat pump functions, making the curtain wall integrated heat pump system more practical.

[0030] (4) The technical solution of the present invention overcomes technical prejudice:

[0031] In traditional concepts, air conditioning or heat pump systems are usually complex and occupy a large space, making them difficult to integrate into curtain walls. At the same time, photocatalysis, as a technology for purifying air and improving environmental quality, is rarely combined with air conditioning and ventilation systems. The technical solution of the present invention breaks this technical prejudice, integrating photocatalysis, ventilation and heat pump functions into a single curtain wall system, combining passive air conditioning energy-saving technology with active technology, and greatly simplifying the building design and construction process. This integrated design not only reduces the installation steps and required materials, but also improves the overall performance and coordination of the system. In addition, since all components are carefully designed and optimized, standardized and modular production can be more easily achieved, further reducing construction costs. The proposal and implementation of this technical solution provides new ideas and solutions for energy conservation, emission reduction and sustainable development in the construction industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a curtain wall integrated heat pump system combining photocatalysis and heat recovery provided in an embodiment of the present invention.

[0033] Figure 2 A flow chart of a method for a curtain wall integrated heat pump combining photocatalysis and heat recovery provided in an embodiment of the present invention.

[0034] In the figure: 1-outer air inlet; 2-valve one; 3-glass curtain wall; 4-valve two; 5-outer air outlet; 6-photovoltaic panel; 7-top fan; 8-valve three; 9-inner air outlet; 10-inner wall; 11-inner air inlet; 12-valve four; 13-bottom fan; 14-irradiation lamp; 15-TiO2 coated plate; 16-exhaust pipe; 17-evaporator; 18-exhaust fan; 19-fresh air pipe; 20-fresh air fan; 21-preheater; 22-air filter; 23-valve five; 24-valve six; 25-membrane heat recovery system; 26-supply fan; 27-compressor; 28-condenser; 29-exhaust duct; 30-afterheater; 31-supply duct; 32-recirculation air duct; 33-circulation air fan; 34-bypass valve; 35-electronic expansion valve; 36-valve seven. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a curtain wall integrated heat pump system combining photocatalysis and heat recovery, including a photocatalysis system, a heat pump system, a ventilation system coupled with the photocatalysis system and the heat pump system, and a heat recovery system for the ventilation system.

[0037] The photocatalytic system includes a glass curtain wall 3, a photovoltaic panel 6, a top fan 7, a bottom fan 13, an irradiation lamp 14, and a TiO2 coated plate 15. The glass curtain wall 3 is connected to the inner wall 10 and then connected to the integrated heat pump system. The photovoltaic panel 6 is placed on the outer curtain wall to make full use of light energy to power the irradiation lamp. The top fan 7 is installed on the top of the curtain wall cavity to promote the flow of fresh air at the top and introduce it into the room through the air outlet inside the curtain wall. The bottom fan 13 is installed on the top of the curtain wall cavity to promote the flow of exhaust gas discharged indoors to fully purify it. The TiO2 coated plate 15 is evenly laid on the outer walls on both sides of the inner side of the glass curtain wall at a certain angle as a plate. In order to make the contact area between the air and the catalyst large enough, the present invention can use a stepped TiO2 coated plate. The irradiation lamp 14 is installed on the upper and lower sides of the curtain wall to provide a light source at night or on cloudy days so that the photocatalysis continues.

[0038] In order to fully promote ventilation, the glass curtain wall is provided with air outlets and air inlets inside and outside. The outer air outlet exchanges air with the external environment and introduces fresh air. The inner air supply outlet is connected to the air inlet of the integrated heat pump system to provide fresh air, and the inner air inlet is connected to the exhaust port of the integrated heat pump system. The exhaust gas is introduced into the glass curtain wall and discharged or recycled into the room after purification. Each air outlet is equipped with a control air valve, which is adjusted according to seasonal changes and changes in the air volume of the ventilation system to control the air flow process and maintain the efficient operation of the system.

[0039] The heat pump system is a micro heat pump, including an evaporator 17, a compressor 27, a condenser 28 and an electronic expansion valve 35, forming a refrigerant cycle. The electronic expansion valve 35 ensures a superheat of 5°C. The compressor 27 selects a variable frequency compressor to improve the heating capacity at low temperatures. The compressor is located in the indoor part of the heat pump, allowing the air sent into the room to pass through, making full use of the waste heat of the compressor and improving the heating efficiency.

[0040] The embodiment of the present invention adopts the hot gas bypass method for defrosting. During defrosting, the compressor 27 and the heat exchanger can still work to maintain the indoor heating. The exhaust port of the compressor 27 leads to a bypass branch to allow high-temperature steam to the evaporator 17 side to achieve defrosting. The bypass valve 34 is located on the branch to control the defrosting process. When the temperature of the evaporator 17 is lower than the set value, the bypass valve 34 is opened to introduce the high-temperature steam at the outlet of the compressor 27, while keeping the ventilation system fan running at a low speed, so as to maintain a continuous supply of hot air, and at the same time increase the electronic expansion valve 35. The entire defrosting process lasts for 10-15 minutes.

[0041] The ventilation system includes an indoor exhaust pipe 16, an outdoor fresh air pipe 19, an indoor exhaust pipe 29, an indoor air supply pipe 31, and a recirculating air pipe 32. The outdoor fresh air pipe 19 introduces the purified air of the photocatalytic system, and the pipe is connected to the fresh air fan 20, the preheater 21, and the air filter 22 in sequence. One branch is connected to the heat recovery system 25, and the air valve 6 24 is placed in front of the heat recovery system 25. The other branch is connected to the bypass pipe to the indoor air supply pipe 31, and the air valve 5 23 is located at the entrance of the bypass pipe. The preheater 21 preheats the fresh air to achieve antifreeze of the membrane heat exchanger. The air filter 22 is used to remove particulate dust and various suspended matter in the fresh air. There is no need for preheating and heat recovery during the transition season, and the fresh air is directly introduced into the air supply pipe 31. The indoor exhaust pipe 29 draws polluted air from the room, passes through the air filter, and is connected to the heat recovery system 25. The recirculation air pipe 32 is connected from the indoor room, passes through the circulating air fan 33 and finally enters the air mixing area. The recirculation air is mainly used to increase the air supply volume to increase the heating power. The air supply duct 31 starts from the heat recovery system, passes through the air mixing area, the air supply fan 26, the compressor 27, the condenser 28, and the post-heater 30 in sequence and finally connects to the indoor room. The exhaust gas pipe 16 is connected from the heat recovery system 25, passes through the exhaust gas fan 18, the evaporator 17 in sequence, and one branch is connected to the air inlet 11 on the inside of the photocatalytic system, and the other branch is directly connected to the outdoors. The outdoor branch is equipped with a wind valve 7 36. The heat pump system uses exhaust gas as a heat source, the evaporation temperature is increased, and the heating efficiency is improved. In the transition season, the heat pump is not started, and the fresh air is directly introduced into the room after purification. In order to prevent the exhaust gas from heating the fresh air, the exhaust gas is not introduced into the photocatalytic system at this time, but is directly discharged to the outdoors. Note that the positions of the evaporator 17 and the condenser 28 are exchanged in summer and winter.

[0042] The heat recovery system is a membrane heat recovery system 25, which makes full use of the enthalpy value of the exhaust gas and recovers heat and moisture at the same time. The fresh air sent into the fresh air duct 19 exchanges heat with the indoor exhaust air at the heat exchanger. In summer, the exhaust air takes away moisture for dehumidification, and in winter, the fresh air recovers moisture to prevent excessive drying in the room. The recovery of moisture makes the system less restricted by indoor humidity conditions, and more fresh air can be introduced, increasing heating power and improving system efficiency.

[0043] The photocatalytic system achieves air purification and ventilation functions through glass curtain walls, photovoltaic panels, fans, irradiation lamps and TiO2 coated panels. Photovoltaic panels provide energy for irradiation lamps to ensure that the photocatalytic reaction continues at night or on cloudy days. The top and bottom fans are linked to the air inlet and outlet of the curtain wall to achieve air circulation. The TiO2 coated panels use photocatalytic reactions to decompose harmful substances in the air, such as volatile organic compounds and particulate matter, while improving air quality. The purified air is introduced into the room through the ventilation system to provide clean fresh air for the room.

[0044] The heat pump system includes a refrigerant cycle consisting of an evaporator, a compressor, a condenser and an electronic expansion valve, which heats the room by absorbing heat from the exhaust gas. The system uses a variable frequency compressor to optimize the heating efficiency under low temperature conditions. When the evaporator temperature is too low to form a frost layer during winter operation, the heat pump defrosts the room through hot gas bypass technology. The high-temperature steam at the compressor outlet is introduced into the evaporator through a bypass valve to melt the frost layer while maintaining indoor heating. The entire process is efficient and does not affect the thermal comfort of users.

[0045] The ventilation system completes air exchange through outdoor fresh air ducts and indoor exhaust ducts. Outdoor fresh air passes through air filters to remove particulate matter and is preheated in a preheater to prevent fresh air from frosting under low temperature conditions. After being processed by the heat recovery system, the fresh air enters the room through the supply air duct. Indoor polluted air is led out through the exhaust duct, and the recirculation air duct is used to supplement the supply air volume to improve the heating efficiency of the heat pump. Fresh air and exhaust air are dynamically adjusted through air valves to ensure the flexibility and energy saving of system operation.

[0046] The heat recovery system uses membrane heat recovery technology to achieve energy recovery through heat exchange between exhaust gas and fresh air. When operating in winter, the heat in the exhaust gas is recovered by the fresh air, and moisture is recovered at the same time to prevent excessive dryness in the room. When operating in summer, the fresh air is cooled and dehumidified by the heat recovery system, and the exhaust air takes away excess moisture to reduce indoor humidity. The heat recovery system improves the energy efficiency of the entire system and improves the comfort of the indoor environment.

[0047] The air supply system combines indoor recirculated air and fresh air at the air mixing point to achieve dynamic adjustment of the air supply volume. The supply air is further heated by the condenser and the post-heater and then sent into the room to maintain the room temperature. The air in the recirculated air duct is not only used to supplement the air supply volume, but also exchanges heat with the exhaust gas in the heat pump system, further improving the heating efficiency and energy-saving performance of the heat pump.

[0048] The system flexibly adjusts its operation mode according to seasonal and climate changes. In winter, the heat recovery system recovers heat and moisture, and the fresh air is heated and sent indoors. The exhaust gas is purified by the photocatalytic system and then discharged. In summer, the heat recovery system cools and dehumidifies the fresh air, while the functions of the evaporator and condenser are interchanged, and the exhaust air takes away excess heat and humidity to maintain indoor comfort. In transitional seasons, the heat pump system stops running, and the fresh air is directly introduced into the room, while the exhaust gas is directly discharged out of the system to reduce energy consumption.

[0049] like Figure 2 As shown, an embodiment of the present invention provides a curtain wall integrated heat pump system combining photocatalysis and heat recovery, and a curtain wall integrated heat pump method combining photocatalysis and heat recovery, comprising:

[0050] When heating is needed in winter, valve two 4, valve five 23, valve seven 36 are closed, valve one 2, valve three 8, valve four 12, valve six 24 are opened, and outdoor fresh air enters from the air inlet 1 on the outside of the glass curtain wall, rises under the action of the top fan 7 and contacts the TiO2 coating plate 15. The exhaust gas discharged by the heat pump system enters the glass curtain wall from the air inlet 11 on the inside of the glass curtain wall under the action of the bottom fan 13. After the fresh air and the exhaust gas are purified by photocatalysis and heated by solar radiation, they are connected to the fresh air duct 19 of the integrated heat pump system. The preheater 21 and the air filter 22 heat the fresh air and filter the particulate matter respectively, and perform full heat exchange with the indoor exhaust air in the membrane heat exchange system 25. After the heated and humidified fresh air is mixed with the circulating air, it absorbs the waste heat of the compressor 27 and the heat released by the condenser 28 and is sent to the room. When the supply air temperature is insufficient, the rear heater 30 is started for heating. The exhaust gas becomes waste gas after heat recovery, and is passed into the evaporator 17 as a heat source to provide heat, and then passed into the photocatalytic system for purification to form an air circulation process. When the photocatalytic effect is sufficient, the degree of purification of the exhaust gas is high, and the valve 2 is closed, and no fresh air is introduced from the outside to reduce heat loss.

[0051] When cooling is needed in summer, valve five 23 and valve seven 36 are closed, valve one 2, valve two 4, valve three 8, valve four 12, and valve six 24 are opened, and the blinds of the curtain wall are opened at the same time to form internal sunshade. Outdoor fresh air enters from the air inlet 5 on the outside of the glass curtain wall, and the exhaust gas discharged by the heat pump system enters the glass curtain wall from the air inlet 11 on the inside of the glass curtain wall under the action of the bottom fan 13. A part of the air absorbs part of the heat radiated by the sun and passes through the air outlet 5 on the outside of the glass curtain wall to the outside. The fresh air and exhaust gas purified by the TiO2 coating plate 15 are passed into the fresh air duct of the heat pump system from the inside air outlet 9. The fresh air is fully heat-exchanged with the indoor exhaust air in the membrane heat recovery system 25, and the cooled and dehumidified fresh air is mixed with the recycled air, and is passed into the room after absorbing heat through the evaporator 17. The indoor exhaust gas is converted into exhaust gas after heat recovery and passed into the condenser 28 as a cold source, the condensation temperature rises, and the refrigeration efficiency is improved. After passing through the condenser 28, the exhaust gas is passed into the photocatalytic system for purification, forming an air circulation process.

[0052] When the cooling capacity of fresh air is needed in the transition season, valves 2 4, 4 12, 6 24 are closed, valves 1 2, 3 8, 5 23, and 7 36 are opened. At this time, the heat pump and heat recovery stop running. The outdoor fresh air is purified by the TiO2 coating plate 15 under the action of the top fan 7 and then enters the fresh air duct 19 of the heat pump system. The preheater 21 also stops working. The purified fresh air passes through the filter 22 and enters the bypass duct, and then connects to the air supply duct 31 to directly supply air to the room. The indoor exhaust is directly discharged to the outside through another branch of the exhaust pipe 16.

[0053] When heating is needed in winter, the system opens valves 1, 3, 4, and 6 to guide outdoor fresh air to enter from the air inlet on the outside of the glass curtain wall. Under the action of the top fan, the fresh air contacts the TiO2 coated plate for photocatalytic purification and absorbs solar radiation heat. The exhaust gas of the heat pump system is guided by the bottom fan into the air inlet on the inside of the glass curtain wall, and is purified and heated together with the fresh air in the photocatalytic system. The purified air is connected to the heat pump system through the fresh air duct, further heated and filtered in the preheater and air filter, and then fully heat exchanged with the indoor exhaust air through the membrane heat exchange system. After the heated fresh air is mixed with the circulating air, it is heated again using the waste heat of the compressor and the heat released by the condenser. If necessary, it is sent indoors after the heat is supplemented by the post-heater. After the exhaust air passes through the heat recovery system, it is passed into the evaporator as a heat source to provide heat and complete the air circulation. By closing valve 1, heat loss can be reduced and efficient operation can be maintained.

[0054] When cooling is needed in summer, the system opens valves 1, 2, 3, 4, and 6, and closes valves 5 and 7, and opens the blinds of the curtain wall to form sunshade. Outdoor fresh air enters from the air inlet on the outside of the glass curtain wall, and the exhaust gas of the heat pump system is guided by the bottom fan into the air inlet on the inside of the glass curtain wall. Part of the air absorbs the heat of solar radiation and is discharged from the air outlet on the outside of the glass curtain wall. The fresh air and exhaust gas purified by the TiO2 coating plate enter the fresh air duct of the heat pump system through the inner air outlet. The fresh air and indoor exhaust air are cooled and dehumidified after full heat exchange in the membrane heat recovery system, mixed with the recirculated air, and sent into the room after absorbing heat through the evaporator. The exhaust air is converted into exhaust gas after heat recovery, and is passed into the condenser as a cold source. After improving the condensation efficiency, it enters the photocatalytic system for purification again to complete the air cycle.

[0055] When using the natural cooling capacity of fresh air in the transition season, the system closes valves 2, 4, and 6, and opens valves 1, 3, 5, and 7. At this time, the heat pump and heat recovery system stop running, and the outdoor fresh air is purified by the TiO2 coating plate under the action of the top fan and connected to the system through the fresh air duct. The preheater stops working, and the fresh air is directly sent into the room through the bypass duct after passing through the filter, forming an efficient natural ventilation and cooling process. The indoor exhaust is directly discharged to the outside through another branch of the exhaust pipe to ensure air circulation and fresh air quality.

[0056] Whether it is winter heating, summer cooling or natural ventilation mode in transitional seasons, the system always ensures efficient operation through flexible switching of photocatalytic purification, heat recovery and heat pump systems. By dynamically adjusting the air valve and optimizing the path and treatment of fresh air and exhaust gas, the system can achieve heating, cooling or ventilation while minimizing energy loss, and using solar radiation and photocatalysis to purify the air, forming a sustainable circulation mode.

[0057] The present invention is a curtain wall integrated heat pump system and method combining photocatalysis and heat recovery, which can be mainly used in the field of building energy conservation and green building development, can promote the development of ultra-low energy consumption buildings and new structural system buildings, help to accelerate the upgrading of my country's construction industry, reduce energy consumption, and slow down the growth rate of total building energy consumption, thereby ensuring the smooth implementation of my country's energy consumption revolution and energy security strategy, and promoting the construction of ecological civilization. It is an important manifestation of achieving sustainable development.

[0058] Specifically, it can be used for energy-saving renovation of existing buildings and new construction of green buildings. Because the curtain wall integrated heat pump system is easy to install and has low cost, it can be widely used in the renovation of old buildings with poor energy performance, especially for multi-family houses and office buildings in cold climates with low load requirements and limited renovation space. At the same time, the invention efficiently utilizes solar energy and recycled heat energy, significantly reduces the energy consumption of buildings, and improves indoor air quality, which is in line with the development trend of green buildings. It can be applied to new commercial complexes, schools, hospitals and other public buildings with high energy efficiency as one of the key technologies to achieve green building standards.

[0059] Relevant evidence of the technical effects achieved by the embodiments of the present invention.

[0060] 1. When the present invention is in operation in winter, the indoor exhaust gas is a high-temperature heat source, and the evaporation temperature is increased. When it is in operation in summer, the indoor air is a low-temperature heat source, the condensation temperature is reduced, and the efficiency of the heat pump is improved. Mechanically assisted ventilation also has a strong effect of improving the indoor environment in the transition season. At the same time, the membrane heat recovery system recycles and utilizes the solar radiation heat absorbed by the curtain wall and the waste heat generated by the heat pump system through heat recovery technology, which effectively improves the energy utilization efficiency compared to general systems. The photocatalytic system can utilize the strong oxidizing free radicals generated by the photocatalytic material under light conditions to decompose organic pollutants and harmful gases in the air to achieve air purification. The above can all serve as evidence of the technical effect of this invention example.

[0061] 2. Relevant literature and data can prove that the ventilation curtain wall and photocatalytic system is almost completely a zero-energy system driven by solar energy. The material and installation cost of the photocatalyst TiO2 used are lower, and its formaldehyde degradation performance can exceed a considerable number of adsorption filter air purifiers on the market. Furthermore, in terms of thermal performance, the use of mechanical ventilation mode coupled with natural ventilation can significantly reduce the heat gain of the building, alleviate the problem of overheating in summer, and greatly increase the ventilation volume of the system, and significantly reduce the concentration of organic matter, thereby improving the indoor environment, saving energy, and improving thermal comfort. At the same time, there are literatures that simulate the integrated heat pump system, which can prove that after the heat pump system is in operation, the indoor carbon dioxide concentration is reduced for a long time, especially after the membrane heat recovery and mechanical ventilation are started, the indoor ambient air quality (IAQ) is significantly improved. In terms of thermal performance, membrane heat recovery (HRV) can reduce the heat load by more than 50%, and its seasonal energy efficiency ratio SPF reaches a high energy efficiency level. Compared with ordinary air source heat pump systems, integrated heat pump systems combined with heat recovery have greatly improved efficiency and consume less electricity. As building energy standards improve and climate temperatures become colder, the reduction in energy consumption and the improvement in performance will become more obvious.

[0062] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A curtain wall integrated heat pump system combining photocatalysis and heat recovery, characterized in that: It includes a photocatalytic system, a heat pump system, a ventilation system coupled with the heat pump system, and a heat recovery system for the ventilation system; The photocatalytic system includes a glass curtain wall, a photovoltaic panel, a fan, a TiO2 photocatalytic layer, and an irradiation lamp; the glass curtain wall is connected to the inner wall and then connected to the heat pump system integrated in the inner curtain wall; the photovoltaic panel is placed on the outer glass plate to make full use of light energy for power supply. The fan is installed at the top and bottom of the curtain wall cavity, and is located at the air outlet on the inner side of the curtain wall to promote air flow; the TiO2 photocatalytic layer is evenly laid on the walls on both sides of the inner side of the glass curtain wall in the form of a plate with a certain inclination; the irradiation lamp is installed on the upper and lower sides of the inner side of the curtain wall; The heat pump system is a micro heat pump, comprising a compressor, an evaporator, a condenser, an electronic expansion valve and a hot gas bypass pipeline; The ventilation system includes an outdoor fresh air duct, an indoor exhaust duct, a recirculating air duct, an indoor air supply duct, an indoor waste air duct, a bypass duct, a preheater and an air filter; the outdoor fresh air duct introduces purified air from the photocatalytic system, and the duct is connected to the fan, the preheater and the air filter in sequence, one branch is connected to the heat recovery system, and the air valve is placed in front of the heat recovery system, and the other branch is connected to the bypass duct and leads to the indoor air supply duct, and the bypass valve is located at the entrance of the bypass duct; the indoor exhaust duct draws out polluted air from the room, passes through the air filter, and is connected to the heat recovery system; the recirculating air duct is connected from the room, passes through the fan and finally enters the air mixing place; the air supply duct starts from the heat recovery system, passes through the air mixing place, the fan, the compressor, the condenser, the preheater in sequence and finally connects to the room; the waste air duct is connected from the heat recovery system, passes through the fan and the evaporator in sequence, one branch is connected to the air inlet on the inside of the photocatalytic system, and the other branch directly leads to the outdoors, and both branches are equipped with air valves.

2. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: The glass curtain wall is provided with air outlets and air inlets both inside and outside. The outer air outlet exchanges air with the external environment; the inner air supply outlet is connected to the integrated heat pump system outlet to provide fresh air to the room or receive exhaust gas from the room.

3. The curtain wall integrated heat pump system combining photocatalysis and heat recovery as claimed in claim 2, characterized in that: Each air outlet is equipped with a control air valve.

4. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: The compressor uses a variable frequency compressor to improve the heating capacity at low temperatures; and the compressor is located in the indoor part of the heat pump, allowing the air delivered to the room to pass through and fully utilize the waste heat of the compressor.

5. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: The hot gas bypass method is used for defrosting. A bypass branch is led out from the exhaust port of the compressor to allow high-temperature steam to reach the evaporator side for defrosting. The bypass valve is located on the branch to control the defrosting process.

6. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: The heat pump system uses the exhaust gas discharged from the room as the heat source, increases the evaporation temperature, and makes full use of the heat in the exhaust gas.

7. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: The heat recovery system selects membrane heat recovery to fully utilize the enthalpy value of the exhaust gas. At the same time, the recovery of moisture can allow more fresh air to be introduced to increase the heating power.

8. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: During winter heating, valves two, five and seven are closed, and valves one, three, four and six are opened. Outdoor fresh air enters through the glass curtain wall, and exhaust gas is passed into the glass curtain wall. After photocatalytic purification, the fresh air duct connected to the integrated heat pump system conducts full heat exchange with the indoor exhaust air. The fresh air is mixed with the circulating air and then delivered to the room through the heat released by the compressor and condenser; the exhaust gas becomes exhaust gas after heat recovery and is passed into the evaporator as a heat source; when the photocatalytic effect is sufficient, the valve can be closed to reduce heat loss.

9. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: During cooling in summer, valves 5 and 7 are closed, and valves 1, 2, 3, 4, and 6 are opened; outdoor fresh air enters through the glass curtain wall, and exhaust gas is discharged into the glass curtain wall. Part of the air is passed to the outdoors through the air outlet to take away part of the heat. The fresh air that has been purified by photocatalysis is passed into the heat pump system through the air inlet. The fresh air that has been heat recovered is mixed with the recycled air and passed into the room after absorbing heat through the evaporator. The indoor exhaust gas is converted into waste gas through heat recovery and passes through the condenser, and the condensation temperature rises.

10. The curtain wall integrated heat pump system combining photocatalysis and heat recovery according to claim 1, characterized in that: During the transition season, valves two, four and six are closed, valves one, three, five and seven are opened, and the heat pump stops running. The outdoor fresh air is purified by the photocatalyst and then passes into the fresh air duct of the heat pump system, passes through the filter, enters the bypass duct and then connects to the air supply duct to directly supply air to the room; the indoor exhaust air is directly discharged to the outdoors through another branch of the exhaust pipe.

Images