Air circulation heating system combined with solar heat storage cobblestone air source heat pump

Abstract

The utility model discloses an air circulation heating system combined with a solar heat storage cobblestone air source heat pump. The air circulation heating system combined with the solar heat storage cobblestone air source heat pump comprises a solar heat collector, a heat storage device, an air heat circulation device and an air source heat pump main machine which are connected in sequence. The heat storage device comprises a heat preservation device and cobblestones used for storing heat. The solar heat collector is used for capturing solar radiation and converting the solar radiation into heat, the heat storage device is used for storing the heat collected by the solar heat collector, and the air heat circulation device is used for transferring the heat of the heat storage device and the heat in the environment into the air source heat pump main machine. And the air source heat pump host is used for heating. According to the air circulation heating system combined with the solar heat storage cobblestone air source heat pump, the night low-temperature operation efficiency of the air source heat pump is improved, and the power consumption of the air source heat pump is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of heating, and specifically relates to an air circulation heating system combining a solar heat storage cobblestone air source heat pump. BACKGROUND

[0002] With the progress of society and the improvement of living quality, people's comfort requirements for living environment are increasing, and building heating energy consumption has become an important issue to be solved. In China, building energy consumption accounts for about 30% of the total terminal energy consumption, and the energy consumption proportion of refrigeration and heating is as high as 40%-50%. With the implementation of the coal replacement policy, the traditional coal-fired heating method is gradually eliminated due to its serious pollution to the environment. China is actively promoting the application of new energy technology to replace this increasingly abandoned traditional coal-fired heating method. At present, solar water heating systems and air source heat pump systems as common forms of new energy heating devices are being widely promoted and applied.

[0003] As one of the renewable new energies highly advocated in China, solar energy has many advantages, including its universality, safety, sustainability and great potential. It is an inexhaustible and inexhaustible energy, and its significant economic benefits have been widely used in production and daily life. As a relatively mature heat pump heating technology, air source heat pump uses air in the environment as a low-temperature heat source, extracts low-grade heat from air by consuming electric energy, and converts it into high-grade heat for building use. This technology has the advantages of small occupation area, energy saving and environmental protection, and high heating energy efficiency ratio, and has become an important part of China's building energy field, and has been widely used in cold regions and hot summer and cold winter regions, showing great application potential and value.

[0004] However, the current solar energy technology and air source heat pump have some problems. Solar energy is affected by natural conditions such as day and night, season, geographical latitude and altitude, and random factors such as sunshine, cloudiness, cloudiness, rain and the like, and has strong instability. Especially in the northern region, the solar radiation fluctuation is more serious, the solar heat flux density is low, the operation efficiency of the solar water heating system is greatly reduced, and the single solar water heating system is insufficient to supply the required heat of the building, especially in severe weather conditions, the influence is more serious, and the electric heating system is often needed to assist heating, and the energy saving is poor. Therefore, solar heating has certain intermittency and is unstable.

[0005] The air source heat pump hot water system can theoretically keep stable and efficient operation all the year round without the influence of environmental factors, but in the actual operation process at night in winter, the outdoor environment temperature is often lower than 0 DEG C, which causes the frosting phenomenon on the surface of the outdoor heat exchanger, especially in the humid area in winter, the humidity in the air is large, the frosting is easy, the air source heat pump faces the problem of frequent frosting, which not only causes the poor heat exchange effect, but also causes the energy consumption increase due to defrosting, and seriously restricts the application and development of the air source heat pump.

[0006] At present, the solar energy and air source heat pump combined heating hot water systems gradually appear in the market, for example, the patent application authorized announcement CN101351373B discloses a heat supply device combined with solar energy and air source heat pump, the structure of the device is too complex, the cost is high, and the circulating pipelines of the two kinds of energy are respectively operated, and the organic combination of the two heat supply devices is not realized.

[0007] In view of the above technical problems existing in the prior art, the utility model provides an air circulation heating system combined with solar energy heat storage cobblestone air source heat pump. Utility model content

[0008] The utility model adopts the following technical scheme:

[0009] The utility model provides an air circulation heating system combined with solar energy heat storage cobblestone air source heat pump, the air circulation heating system combined with solar energy heat storage cobblestone air source heat pump includes:

[0010] Solar energy collector, heat storage device, air heat circulation device, air source heat pump host are connected in sequence;

[0011] The heat storage device includes heat preservation device and cobblestone for heat storage;

[0012] The solar energy collector is used for capturing solar radiation and converting into heat, the heat storage device is used for storing the heat collected by the solar energy collector, the air heat circulation device is used for transferring the heat of the heat storage device and the heat in the environment into the air source heat pump host, and the air source heat pump host is used for heating.

[0013] Further, the solar energy collector and the heat storage device are connected through a circulating pipeline, the circulating pipeline is used for transferring the heat collected by the solar energy collector into the heat storage device, a heat conducting medium is arranged in the circulating pipeline, and the heat conducting medium is air or water.

[0014] Further, the air circulation heating system combined with solar energy heat storage cobblestone air source heat pump further includes a photovoltaic panel, and the photovoltaic panel is used for photovoltaic power generation to provide power for the air source heat pump host.

[0015] Further, the circulating pipeline is provided with a circulating control device, which controls the opening and closing of the heat transfer process through the photovoltaic panel or the pebble temperature sensor arranged in the heat storage device and the heat collector temperature sensor arranged in the solar heat collector.

[0016] Further, the circulating control device is controlled by the photovoltaic panel, which detects that the light intensity reaches a pre-set threshold value, the photovoltaic panel operates and powers on the circulating control device to open the heat transfer process; the photovoltaic panel detects that the light intensity does not reach the pre-set threshold value, the photovoltaic panel is closed and stops powering the circulating control device to close the heat transfer process.

[0017] Further, the circulating control device is controlled by the pebble temperature sensor and the heat collector temperature sensor, and the heat transfer process is opened when the temperature value of the heat collector temperature sensor exceeds the temperature value of the pebble temperature sensor by a pre-set threshold value.

[0018] Further, the air heat circulation device comprises:

[0019] The cabinet is connected to the heat storage device and the air source heat pump main unit.

[0020] The heat storage air outlet valve and the heat storage air return valve are arranged at the connection between the cabinet and the heat storage device, and are used to exchange heat with the heat storage device.

[0021] The environment air outlet valve and the environment air inlet valve are arranged on the cabinet, and are used to exchange heat with the outside world.

[0022] The heat storage air outlet valve, the heat storage air return valve, the environment air outlet valve and the environment air inlet valve are controlled by the pebble temperature sensor and the environment temperature sensor arranged in the outside world.

[0023] Further, the heat storage air outlet valve, the heat storage air return valve, the environment air outlet valve and the environment air inlet valve are controlled by the clock:

[0024] During the day, the environment air outlet valve and the environment air inlet valve are opened, and the heat storage air outlet valve and the heat storage air return valve are closed.

[0025] At night, the environment air outlet valve and the environment air inlet valve are closed, and the heat storage air outlet valve and the heat storage air return valve are opened.

[0026] Further, the air source heat pump main unit comprises an evaporator and an evaporator fan arranged in the air heat circulation device, and the air source heat pump main unit is connected to the evaporator.

[0027] Furthermore, the heat preservation device is a heat preservation tank or a heat storage stack located underground with an insulation layer.

[0028] Compared with the prior art, the superior effects of this utility model are as follows:

[0029] 1. The air circulation heating system of the present invention, which combines solar thermal storage pebble air source heat pump, uses pebble heat storage. Compared with traditional liquid heat storage materials such as water or oily substances, it is extremely stable in form, easy to store, and has no pollution.

[0030] 2. The air circulation heating system of this utility model, which combines solar thermal storage pebble air source heat pump, uses air as the circulation medium, reducing maintenance rate and cost, and avoiding the pipe and pump freezing problems faced by traditional water circulation.

[0031] 3. The air circulation heating system of the present invention, which combines a solar thermal storage pebble air source heat pump, combines the advantages of air source heat pumps and solar collectors, improves the low-temperature operation efficiency of air source heat pumps at night, and significantly reduces the power consumption of air source heat pumps.

[0032] 4. The air circulation heating system of the present invention, which combines solar thermal storage pebble air source heat pump, absorbs heat from the thermal storage module when running at night. The thermal storage module is equipped with a heat preservation device, and the temperature generally does not fall below 7°C. The air source heat pump is not prone to frost during operation, thus saving defrosting energy consumption. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the air circulation heating system of the present invention, which combines a solar thermal storage pebble air source heat pump.

[0034] The diagram shows: 1-Solar collector, 2-Circulation pipe, 3-Photovoltaic panel, 4-Fan, 5-Heat storage device, 6-Air heat circulation device, 7-Air source heat pump main unit. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0036] Example

[0037] like Figure 1 As shown, the air circulation heating system combining solar thermal storage and pebble air source heat pump includes: a solar collector 1, a circulation pipe 2, a photovoltaic panel 3, a thermal storage device 5, an air heat circulation device 6, and an air source heat pump main unit 7.

[0038] The set solar collector 1 is installed in the outdoor place with sufficient light for capturing solar radiation and converting it into heat. The heat storage device 5 is connected with the solar collector 1 for storing the heat. The circulating pipeline 2 connects the solar collector 1 and the heat storage device 5, ensuring that the heat collected by the solar collector 1 is effectively transferred to the heat storage device 5.

[0039] The air heat circulation device 6 and the air source heat pump host 7 are connected with the heat storage device 5 in sequence, for transferring the heat of the heat storage device 5 to the air source heat pump host 7. The air source heat pump host 7 extracts the heat in the heat storage device 5 or the heat in the air for indoor heating.

[0040] The photovoltaic panel 3 is connected with the air source heat pump host 7. The photovoltaic panel 3 is used for photovoltaic power generation to provide electric energy for the air source heat pump host 7.

[0041] In the embodiment, a plurality of solar collectors 1 are arranged on the roof of a building. The circulating pipeline 2 connects the solar collectors 1 and the heat storage device 5.

[0042] The circulating pipeline 2 includes a heat-conducting medium circulating in the circulating pipeline 2 and a circulating control device for driving the heat-conducting medium to circulate. The specific configuration of the circulating pipeline 2 needs to be selected according to the environmental conditions. The material of the circulating pipeline 2 is determined according to the maximum temperature that the solar collector 1 can reach. If the maximum temperature does not exceed 80℃, PVC pipeline is used. If the maximum temperature exceeds 80℃, metal pipeline is selected. The heat-conducting medium can be air or water. Water has a higher specific heat capacity and can carry more heat in a single cycle, but it is greatly affected by the environment, especially in low-temperature conditions in winter. If it stops flowing, it is easy to freeze, thereby damaging the pipeline. In contrast, air circulation does not need to consider the problem of freezing, and it can save the anti-freezing energy consumption of the pipeline and water pump, avoid the problems of water leakage and corrosion, and is easier to maintain and construct, with a longer service life.

[0043] The control logic of the circulating control device is based on temperature difference or light intensity control. When the light intensity control is used, a light-sensitive sensor is installed near the solar collector 1. When the light-sensitive sensor detects that the light intensity reaches a preset threshold, the circulation of the heat-conducting medium in the circulating pipeline 2 is started. Conversely, if the light intensity does not reach the preset threshold, the circulation of the heat-conducting medium in the circulating pipeline 2 is stopped. When the temperature difference control is used, a cobblestone temperature sensor is arranged in the heat storage device 5, and a collector temperature sensor is arranged in the solar collector 1. When the temperature of the solar collector 1 exceeds the temperature of the heat storage device 5, and the difference exceeds a preset threshold, the circulation of the heat-conducting medium in the circulating pipeline 2 is started.

[0044] In this embodiment, the circulating pipeline 2 is made of PVC pipeline, and a heat preservation layer is arranged outside the PVC pipeline. The heat conducting medium is air. The air inlet of the circulating pipeline 2 is connected to the upper part of the heat storage device 5, and the air outlet of the circulating pipeline 2 is connected to the lower part of the heat storage device 5. The fan 4 is arranged near the air outlet of the circulating pipeline 2 to push the air in the circulating pipeline 2 to circulate.

[0045] In this embodiment, the operation of the fan 4 is controlled by the light intensity. The photovoltaic panel 3 is directly connected to the fan 4, and the fan 4 is powered by the photovoltaic panel 3. The working time of the fan 4 is substantially the same as the operation time of the photovoltaic panel 3. When the photovoltaic panel 3 stops working due to insufficient light, the fan 4 will also automatically stop running. In this embodiment, the photovoltaic panel 3 can not only provide the required power for the air source heat pump main machine 7 during the day, but also adjust the operation of the fan 4 to realize that the solar heat collector 1 collects heat during the day and provides corresponding heat to the heat storage device 5. At night, the fan 4 stops running to prevent the heat in the heat storage device 5 from flowing back to the solar heat collector 1 in the opposite direction.

[0046] In a specific embodiment, the operation of the fan 4 is controlled by the temperature difference. When the temperature of the solar heat collector 1 is 5℃ higher than the temperature of the heat storage device 5, the fan 4 is started.

[0047] The heat storage device 5 includes a heat preservation device, pebbles for storing heat, and a pebble temperature sensor. The heat preservation device is a heat preservation tank or a heat storage pile located in the ground and provided with a heat preservation layer. In this embodiment, the heat storage device 5 is a heat preservation tank arranged in a building. Compared with other heat storage materials, the pebbles used in the present application have a significant cost advantage and are easy to obtain. Compared with liquid heat storage media such as water or oil substances, the pebbles have stable form, do not need to add chemicals, have no shelf life problem, are easy to store, and are pollution-free, odorless and non-corrosive. Whether buried in the ground or placed in a container, it is suitable. In addition, the pebbles are easy to circulate, have large gaps between particles, support water circulation or air circulation, and have low circulation resistance. The heat storage temperature of the pebbles can reach 1000℃, and the physical properties are stable. The specific gravity is 2500kg / m 3 Therefore, the occupied space is small. The heat storage performance of the pebbles and water is compared in the following table 1.

[0048] Table 1 Comparison of heat storage performance of pebbles and water

[0049]

[0050] The air heat recycling device 6 comprises a box, a heat storage outlet air valve, a heat storage return air valve, an ambient exhaust air valve and an ambient intake air valve. The box is connected to the heat storage device 5 and the air source heat pump main machine 7. The heat storage outlet air valve and the heat storage return air valve are arranged at the connection between the box and the heat storage device 5, and are used to transfer the heat of the heat storage device 5 to the box. The ambient exhaust air valve and the ambient intake air valve are arranged on the box, and are responsible for connecting the outside and the box to realize the exchange of heat between the box and the outside.

[0051] In this embodiment, the heat storage return air valve is arranged at the upper part of the connection between the box and the heat storage device 5, and the heat storage outlet air valve is arranged at the lower part of the connection between the box and the heat storage device 5. The heat storage return air valve and the air inlet of the circulating pipeline 2 are both located at the upper part of the heat storage device 5, and the heat storage outlet air valve and the air outlet of the circulating pipeline 2 are both located at the lower part of the heat storage device 5. Such a layout ensures smooth operation of the air circulation when the solar heat collector 1 directly provides heat for the air source heat pump main machine 7. As for the ambient exhaust air valve and the ambient intake air valve, since they are connected to the outside, their specific configuration needs to be determined according to the external environmental conditions, and factors such as dust prevention and noise reduction need to be considered.

[0052] The control logic of the heat storage outlet air valve, the heat storage return air valve, the ambient exhaust air valve and the ambient intake air valve is time control and temperature control. The heat storage outlet air valve, the heat storage return air valve, the ambient exhaust air valve and the ambient intake air valve are controlled by a clock or a cobblestone temperature sensor and an ambient temperature sensor arranged in the outside.

[0053] When the heat storage outlet air valve, the heat storage return air valve, the ambient exhaust air valve and the ambient intake air valve are controlled by the clock,

[0054] During the day, the solar collector 1 and the photovoltaic panel 3 can operate efficiently due to the sufficient sunlight. At this time, according to the environmental conditions, the heat storage outlet air valve and the heat storage return air valve can be selectively opened, while the environmental exhaust air valve and the environmental inlet air valve are closed; or conversely, the heat storage outlet air valve and the heat storage return air valve are closed, while the environmental exhaust air valve and the environmental inlet air valve are opened. When the heat storage outlet air valve and the heat storage return air valve are in the open state, and the environmental exhaust air valve and the environmental inlet air valve are closed, the heat of the solar collector 1 will be directly supplied to the air source heat pump host 7, significantly reducing its power consumption. At the same time, the power generated by the photovoltaic panel 3 can be stored for use at night. In this process, the solar collector 1 simultaneously provides heat to the heat storage device 5 and the air source heat pump host 7. If the heat generated by the solar collector 1 is insufficient to meet the demand throughout the day, the heat storage outlet air valve and the heat storage return air valve will be closed, and the environmental exhaust air valve and the environmental inlet air valve will be opened, so that the heat generated by the solar collector 1 is stored in the heat storage device 5. Since the ambient temperature during the day is usually higher than at night, the power consumption of the air source heat pump host 7 in absorbing heat from the environment during the day will be less than that of directly absorbing heat from the environment at night. Therefore, in this case, the solar collector 1 is responsible for storing heat for the heat storage device 5, while the air source heat pump host 7 absorbs heat from the environment to provide heating for the building.

[0055] At night, the solar collector 1 and the photovoltaic panel 3 will suspend operation due to insufficient sunlight. At this time, the fan 4 in the circulating pipeline 2 will also stop running to avoid the heat in the heat storage device 5 flowing back to the solar collector 1. The air heat circulation device 6 will open the heat storage outlet air valve and the heat storage return air valve, while closing the environmental exhaust air valve and the environmental inlet air valve. The heat stored in the pebbles in the heat storage device 5 is transported to the box through air circulation, and the air pump heat source absorbs heat from the box for heating. Since the heat in the box is significantly higher than the ambient temperature, the power consumption of the air pump heat source can be reduced. At the same time, the heat source temperature of the air source heat pump host 7 at night (i.e. the pebble-box temperature) is usually higher than 7℃, which makes the air source heat pump host 7 unable to reach the defrosting condition, thereby saving about 6% of the defrosting energy consumption. This series of measures improves the stability of the equipment operation.

[0056] The heat storage outlet air valve, the heat storage return air valve, the environmental exhaust air valve, and the environmental inlet air valve are controlled by temperature difference. The temperature of the heat storage device 5 and the environment temperature are collected by the pebble temperature sensor and the environmental temperature sensor set in the outside environment. When the temperature of the heat storage device 5 is higher than the environmental temperature, the heat storage outlet air valve and the heat storage return air valve are opened, and the environmental exhaust air valve and the environmental inlet air valve are closed; conversely, when the temperature of the heat storage device 5 is lower than the environmental temperature, the heat storage outlet air valve and the heat storage return air valve are closed, and the environmental exhaust air valve and the environmental inlet air valve are opened.

[0057] The air source heat pump host 7 comprises an evaporator and an evaporator fan, the evaporator and the evaporator fan are arranged in the air heat circulating device 6, the air source heat pump host 7 is connected with the evaporator, and the evaporator fan is responsible for directing hot air to the evaporator.

[0058] In the embodiment, the air source heat pump host 7 is connected with the water supply pipe and the return water pipe, the return water pipe is provided with a circulating water pump, the air source heat pump host 7 is responsible for heating water introduced by the water supply pipe and delivering hot water to the building through the return water pipe.

[0059] The air source heat pump heating operation cost is directly related to the outdoor environment temperature, in a specific embodiment, one full frequency conversion 5.0HP air source heat pump unit is selected for the experimental example and the comparison example, and the photovoltaic panel 3 is not configured, so as to prevent the influence of different illumination conditions on the power consumption statistics, and the experimental example and the comparison example are operated in the same environment in Beijing winter.

[0060] Table 2: traditional air source heat pump comparison example

[0061]

[0062] Table 3: experimental example of the system of the utility model

[0063]

[0064] From the above table 2 and table 3, it can be seen that the air source heat pump host 7 of the utility model improves the night low temperature operation efficiency, and even higher than the daytime operation efficiency, so that 30% of the power consumption can be saved.

[0065] The utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description are only for explaining the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and the changes and improvements all fall within the scope of the utility model. The protection scope of the utility model is defined by the attached claims.

Claims

1. An air circulation heating system combined with a solar energy heat storage pebble air source heat pump, characterized in that, The application relates to a solar energy storage and heat pump air circulation heating system. The system comprises a solar energy collector, a heat storage device, an air heat circulation device and an air source heat pump host machine connected in sequence. The heat storage device comprises a heat preservation device and a cobblestone for storing heat. The solar energy collector is used for capturing solar radiation and converting the solar radiation into heat, the heat storage device is used for storing the heat collected by the solar energy collector, the air heat circulation device is used for transferring the heat of the heat storage device and the heat in the environment into the air source heat pump host machine, and the air source heat pump host machine is used for heating.

2. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 1, characterized in that, The solar energy collector and the heat storage device are connected through a circulating pipeline which is used for transferring the heat collected by the solar energy collector into the heat storage device, and the circulating pipeline is provided with a heat conducting medium, which is air or water.

3. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 1, characterized in that, The solar energy storage and heat pump air circulation heating system further comprises a photovoltaic panel which is used for generating electricity through photovoltaic power generation to provide power for the air source heat pump host machine.

4. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 2, characterized in that, A circulating control device is arranged on the circulating pipeline, and the circulating control device controls the opening and closing of the heat transfer process through the photovoltaic panel, a cobblestone temperature sensor arranged in the heat storage device and a heat collector temperature sensor arranged in the solar energy collector.

5. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 4, characterized in that, The circulating control device is controlled by the photovoltaic panel, the photovoltaic panel detects the light intensity to reach a preset threshold value, the photovoltaic panel operates and supplies power to the circulating control device to open the heat transfer process, and the photovoltaic panel detects the light intensity to not reach the preset threshold value, the photovoltaic panel is closed and stops supplying power to the circulating control device to close the heat transfer process.

6. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 4, characterized in that, The circulating control device is controlled by the cobblestone temperature sensor and the heat collector temperature sensor, and the heat collector temperature sensor is opened when the temperature value exceeds the temperature value of the cobblestone temperature sensor to reach a preset threshold value.

7. The air circulation heating system combined with a solar heat storage pebble air source heat pump according to claim 1, characterized in that, The air heat circulation device comprises: a box body connected with the heat storage device and the air source heat pump host machine; a heat storage air outlet valve and a heat storage air return valve arranged at the connection position of the box body and the heat storage device, and the heat storage air outlet valve and the heat storage air return valve are used for exchanging heat with the heat storage device; an environment air exhaust valve and an environment air inlet valve arranged on the box body, and the environment air exhaust valve and the environment air inlet valve are used for exchanging heat with the outside world; the heat storage air outlet valve, the heat storage air return valve, the environment air exhaust valve and the environment air inlet valve are controlled by the cobblestone temperature sensor and an environment temperature sensor arranged in the outside world.

8. The air circulation heating system combined with the solar heat storage pebble air source heat pump according to claim 7, characterized in that, The heat storage air outlet valve, the heat storage air return valve, the environment air exhaust valve and the environment air inlet valve are controlled by a clock: during the day, the environment air exhaust valve and the environment air inlet valve are opened, and the heat storage air outlet valve and the heat storage air return valve are closed; at night, the environment air exhaust valve and the environment air inlet valve are closed, and the heat storage air outlet valve and the heat storage air return valve are opened.

9. The air circulation heating system combined with a solar heat storage pebble air source heat pump according to claim 1, characterized in that, The air source heat pump host machine comprises an evaporator and an evaporator fan arranged in the air heat circulation device, and the air source heat pump host machine is connected with the evaporator.

10. The air circulation heating system combined with a solar heat storage pebble air source heat pump according to claim 1, characterized in that, The heat preservation device is a heat preservation tank or a heat storage pile provided with a heat preservation layer in the ground.

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