Solar energy and air source heat pump combined heat supply system

Abstract

The utility model discloses a solar energy and air source heat pump combined heat supply system which comprises a solar heat collector, an air source heat pump, a heat storage water tank, a heat consumer, a solar radiation intensity sensor, a plurality of temperature sensors, a plurality of electromagnetic valves, a plurality of water pumps and a controller. Compared with the prior art, the advantages of the solar heat collector and the air source heat pump are complemented, and the problems that the stability of solar energy is insufficient and the efficiency of the air source heat pump is low under the condition of low temperature are solved. And on the other hand, through mutual conversion of multiple heat supply modes, solar energy with different radiation intensities is effectively utilized, and the utilization efficiency of the solar energy and the air energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of renewable energy, in particular to a solar energy and air source heat pump combined heating system. Background Art

[0002] Energy is an important guarantee for maintaining the development of human society, but excessive energy consumption has brought about serious energy crisis and environmental pollution. At present, most parts of my country still use fossil energy such as coal for heating, and the call for heating in the south is getting louder and louder. The energy consumption of building heating has reached 40% of the total energy consumption of buildings. It is urgent to develop renewable energy heating technology. Among them, solar energy and air energy are widely used because of their environmental protection and universality.

[0003] Solar energy is a clean, renewable energy source with huge reserves and easy development and utilization. Solar heating technology is a heating technology that converts solar energy into heat energy through solar collectors and transfers it to a fluid medium. However, the use of solar energy is greatly affected by weather changes and is unstable. Traditional solar heating devices cannot utilize solar radiation at night, or when solar radiation is weak, the temperature of hot water produced by solar heating devices cannot meet user needs due to heat leakage from solar collectors in solar water heaters. Therefore, when using solar collectors for heating, auxiliary heat sources (such as electricity) need to be added to obtain continuous and stable heat, which greatly reduces the energy efficiency of the system.

[0004] Air source heat pump is an energy-saving and efficient heating equipment. Its heat source (air) is clean, renewable, widely distributed, and has huge reserves. Air source heat pump only needs to consume a small amount of electricity to transfer the heat energy in the air to the high-level heat source. However, the air temperature has a great influence on the heating performance of air source heat pump. In low temperature environment, the efficiency of air source heat pump is low, and it will also cause evaporator frost, and in severe cases, it will cause unit failure, which seriously affects the application of air source heat pump in cold areas.

[0005] Therefore, it is urgent to develop a combined heating system of solar energy and air source heat pumps to achieve the complementary advantages of solar collectors and air source heat pumps, effectively alleviating the problems of insufficient stability of solar energy and low efficiency of air source heat pumps under low temperature conditions. Utility Model Content

[0006] The present application provides a solar energy and air source heat pump combined heating system to solve the problems of insufficient stability of solar energy and low efficiency of air source heat pump under low temperature conditions.

[0007] In order to achieve the above-mentioned purpose, this application adopts the following technical solution.

[0008] A solar energy and air source heat pump combined heating system, comprising a solar collector, an air source heat pump, a hot water storage tank, a heat user and a controller;

[0009] The air source heat pump comprises an evaporator, a compressor and a condenser which are respectively connected to form a circulation loop through pipelines, and a fan arranged corresponding to the evaporator; a refrigerant pipe and a first heat exchange pipe are arranged in the condenser, and the two ends of the refrigerant pipe are respectively connected to the compressor and the evaporator; a second heat exchange pipe and a third heat exchange pipe are arranged in the hot water storage tank;

[0010] The water outlet end of the solar thermal collector is respectively connected to one end of the evaporator and one end of the first pipe, and the other end of the first pipe is respectively connected to the water outlet end of the first heat exchange pipe and the water inlet end of the second heat exchange pipe; the water inlet end of the solar thermal collector is respectively connected to the other end of the evaporator and one end of the second pipe, and the other end of the second pipe is respectively connected to the water inlet end of the first heat exchange pipe and the water outlet end of the second heat exchange pipe; the water inlet end and the water outlet end of the third heat exchange pipe are respectively connected to the two ends of the heat user;

[0011] The solar collector is provided with a solar radiation intensity sensor, a first temperature sensor is provided at the water outlet of the solar collector, a second temperature sensor is provided at the water inlet of the solar collector, a third temperature sensor is provided at the water outlet of the second heat exchange tube, and a fourth temperature sensor is provided at the water outlet of the third heat exchange tube. The solar radiation intensity sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are electrically connected to the controller respectively;

[0012] A first solenoid valve is provided on the first pipeline, a second solenoid valve is provided between the water inlet end of the solar collector and the evaporator, a third solenoid valve is provided on the second pipeline, and a fourth solenoid valve is provided at the water inlet end of the first heat exchange tube, and the first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve are electrically connected to the controller respectively;

[0013] A first water pump is provided between the water inlet end of the solar collector and the evaporator, a second water pump is provided at the water outlet end of the second heat exchange tube, and a variable frequency water pump is provided at the water outlet end of the third heat exchange tube. The first water pump, the second water pump and the variable frequency water pump are electrically connected to the controller respectively.

[0014] In some embodiments, the evaporator includes an inner sleeve, an outer sleeve sleeved outside the inner sleeve, and a plurality of fins; the plurality of fins are arranged in parallel to form a fin array; each fin is provided with a plurality of through holes, and the inner sleeve and the outer sleeve are Z-shaped and pass through the through holes on each fin in the fin array; the two ends of the inner sleeve are respectively connected to the compressor and the condenser, and the two ends of the outer sleeve are respectively connected to the water outlet and the water inlet of the solar collector.

[0015] In some embodiments, a throttle valve is provided between the condenser and the evaporator.

[0016] In some embodiments, a fifth solenoid valve is provided at the water outlet end of the third heat exchange tube, and the fifth solenoid valve is electrically connected to the controller.

[0017] The present application has at least the following technical effects or advantages: it realizes the complementary advantages of solar collectors and air source heat pumps, solves the problem of insufficient stability of solar energy and low efficiency of air source heat pumps under low temperature conditions. On the other hand, through the mutual conversion of multiple heating modes, solar energy with different radiation intensities can be effectively utilized, and the utilization efficiency of solar energy and air energy can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a solar energy and air source heat pump combined heating system in one embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the structure of an evaporator in one embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the state of a solar thermal collector and an air source heat pump in parallel heating mode in one embodiment of the present application;

[0021] Figure 4 This is a schematic diagram of the state of a dual-heat source heat pump heating mode in one embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of the state of an air source heat pump heating mode in one embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the state of a solar thermal collector in heating mode in one embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Embodiment 1

[0026] See also Figure 1 A solar energy and air source heat pump combined heating system includes a solar collector 1, an air source heat pump, a water storage tank 7, a heat user 8 and a controller 14. The heat user 8 indirectly exchanges heat with the water storage tank 7, and the hot water returns to the water storage tank 7 after releasing heat in the heat user 8.

[0027] The air source heat pump includes an evaporator 2, a compressor 4 and a condenser 6 connected to form a circulation loop through pipelines, and a fan 3 corresponding to the evaporator 2. Preferably, a throttle valve 5 is also provided between the condenser 6 and the evaporator 2. The fan 3 is an axial flow fan, which maintains air flow and enhances the heat exchange between the air and the fins and the outer casing. The compressor 4 is a heat pump power element, which compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then presses the refrigerant into the condenser 6. The condenser 6 is a shell and tube heat exchanger. In the condenser 6, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the return water of the hot water storage tank 7, and the refrigerant transfers the condensation heat to the water, and the liquid refrigerant flows into the throttle valve, and the water returns to the hot water storage tank 7. The throttle valve 5 converts the medium-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure refrigerant through the throttling effect, and the refrigerant enters the evaporator 2 after throttling. The condenser 6 is provided with a refrigerant pipe 61 and a first heat exchange pipe 62. One end of the refrigerant pipe 61 is connected to the compressor 4, and the other end is connected to the evaporator 2 via the throttle valve 5. The hot water storage tank 7 is provided with a second heat exchange pipe 71 and a third heat exchange pipe 72.

[0028] The evaporator 2 in this embodiment adopts a composite evaporator, such as Figure 2 As shown, it includes an inner sleeve 20, an outer sleeve 19 sleeved outside the inner sleeve, and a plurality of fins 18. The plurality of fins 18 are arranged in parallel to form a fin array, and each fin 18 is provided with a plurality of through holes. The inner sleeve 20 and the outer sleeve 19 pass through the through holes on each fin in the fin array in a zigzag shape. One end of the inner sleeve 20 is connected to the compressor 4, and the other end is connected to the condenser 6 through the throttle valve 5. The compound evaporator can absorb heat from the air and the heat transfer medium at the same time, increase the evaporation temperature of the heat pump, alleviate the frosting phenomenon of the evaporator, and improve the performance of the heating system.

[0029] The water outlet of the solar collector 1 is respectively connected to one end of the outer sleeve 19 of the evaporator 2 and one end of the first pipe 15, and the other end of the first pipe 15 is respectively connected to the water outlet of the first heat exchange pipe 62 and the water inlet of the second heat exchange pipe 71. The water inlet of the solar collector 1 is respectively connected to the other end of the outer sleeve 19 and one end of the second pipe 16, and the other end of the second pipe 16 is respectively connected to the water inlet of the first heat exchange pipe 62 and the water outlet of the second heat exchange pipe 71. The water inlet and water outlet of the third heat exchange pipe 72 are respectively connected to the two ends of the heat user 8.

[0030] A solar radiation intensity sensor 10 is provided on the solar collector 1, a first temperature sensor 9-1 is provided at the water outlet of the solar collector 1, a second temperature sensor 9-2 is provided at the water inlet of the solar collector 1, a third temperature sensor 9-3 is provided at the water outlet of the second heat exchange tube, and a fourth temperature sensor 9-4 is provided at the water outlet of the third heat exchange tube. The solar radiation intensity sensor 10, the first temperature sensor 9-1, the second temperature sensor 9-2, the third temperature sensor 9-3, and the fourth temperature sensor 9-4 are electrically connected to the controller 14 respectively.

[0031] A first solenoid valve 11-1 is provided on the first pipeline 15, a second solenoid valve 11-2 is provided between the water inlet end of the solar collector 1 and the evaporator 2, a third solenoid valve 11-3 is provided on the second pipeline 16, a fourth solenoid valve 11-4 is provided at the water inlet end of the first heat exchange tube 62, and a fifth solenoid valve 11-5 is provided at the water outlet end of the third heat exchange tube 72. The first solenoid valve 11-1, the second solenoid valve 11-2, the third solenoid valve 11-3, the fourth solenoid valve 11-4, and the fifth solenoid valve 11-5 are electrically connected to the controller 14, respectively.

[0032] A first water pump 12-1 is provided between the water inlet of the solar collector 1 and the evaporator 2, a second water pump 12-2 is provided at the water outlet of the second heat exchange tube 71, and a variable frequency water pump 13 is provided at the water outlet of the third heat exchange tube 72. The first water pump 12-1, the second water pump 12-2, and the variable frequency water pump 13 are electrically connected to the controller 14 respectively. The variable frequency water pump 13 controls the hot water circulation of the heat user 8 so that the hot water flows in a constant temperature difference variable flow manner.

[0033] The above solar energy and air source heat pump combined heating system has four working modes to choose from: solar collector and air source heat pump parallel heating mode, dual heat source heat pump heating mode, air source heat pump heating mode and solar collector heating mode.

[0034] In the parallel heating mode of the solar collector and the air source heat pump, the first solenoid valve, the third solenoid valve, and the fourth solenoid valve are opened, and the second water pump is turned on. Figure 3 In this mode, the water from the hot water storage tank flows into the condenser and the solar collector respectively, and the solar collector and the air source heat pump jointly bear the heat load of the heat user.

[0035] In the dual-source heat pump heating mode, the second solenoid valve and the fourth solenoid valve are opened, and the first water pump and the second water pump are turned on. Figure 4 When the solar radiation intensity is low, the dual-source heat pump heating mode is operated. In this mode, the water outlet of the double-core evaporator first flows into the solar collector, and then returns to the evaporator after being heated. The solar energy and the low-temperature water in the pool are used as heat sources for the heat pump, which improves the evaporation temperature and heating efficiency of the heat pump.

[0036] In the air source heat pump heating mode: the fourth solenoid valve is opened, the second water pump is turned on, such as Figure 5 On rainy days or at night when solar radiation is weak, the air source heat pump mode is operated, and the heat load on the heat user side is borne by the air source heat energy.

[0037] In the solar collector heating mode, the first solenoid valve and the third solenoid valve are opened, and the second water pump is turned on. Figure 6 When the temperature of the hot water storage tank reaches the set value and the heat collected by the solar collector is greater than 50W / m2, the solar collector mode is operated and the solar collector provides heat.

[0038] The above four modes can be switched manually or automatically according to the following conditions:

[0039] When S>S0, T4<T0,ΔT> When T0', ΔT'>T0', the solar collector and air source heat pump enter parallel heating mode.

[0040] When S>S0, T4<T0,ΔT≤T0’,ΔT’> At T0', the dual heat source heat pump heating mode is entered.

[0041] When S S0, T4>T0, ΔT≤T0', ΔT'≤T0', the air source heat pump heating mode is entered.

[0042] When S S0, T4 ≥ T0, ΔT>T0', ΔT'≤T0', the solar collector heating mode is entered.

[0043] Where S is the solar radiation intensity measured by the solar radiation intensity sensor, and S0 is the solar radiation intensity threshold, which ranges from 45 to 55 W / m 2 In this embodiment, the preferred value is 50W / m 2 . ΔT=T1-T3, ΔT'=T1-T2; T1 is the temperature value measured by the first temperature sensor, T2 is the temperature value measured by the second temperature sensor, T3 is the temperature value measured by the third temperature sensor, T4 is the temperature value measured by the fourth temperature sensor, T0 is the first temperature threshold, the value range is 40~50, and the preferred value in this embodiment is 45. T0' is the second temperature threshold, the value range is 1~3, and the preferred value in this embodiment is 2.

[0044] The automatic switching conditions are shown in Tables 1 and 2 below.

[0045] Table 1

[0046]

[0047] Table 2

[0048]

[0049] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0050] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various utility model aspects, in the above description of exemplary embodiments of the utility model, the various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: the claimed utility model requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims, the utility model aspects are less than all the features of the previously disclosed single embodiment. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the utility model.

[0051] Those skilled in the art will appreciate that the modules or units or groups of the devices in the examples disclosed herein may be arranged in the device as described in the embodiment, or alternatively may be located in one or more devices different from the devices in the example. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0052] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or groups in the embodiments may be combined into one module or unit or group, and in addition they may be divided into a plurality of submodules or subunits or subgroups. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0053] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the following claims, any one of the claimed embodiments may be used in any combination.

[0054] In addition, some of the embodiments are described herein as a combination of methods or method elements that can be implemented by a processor of a computer system or by other devices that perform the functions. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, the elements described herein of the device embodiments are examples of devices that are used to implement the functions performed by the elements for the purpose of implementing the utility model.

[0055] The various techniques described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the method and apparatus of the present invention, or some aspects or parts of the method and apparatus of the present invention can be embedded in a tangible medium, such as a floppy disk, a CD-ROM, a hard disk drive, or a program code (i.e., an instruction) in any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the present invention.

[0056] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store the program code; the processor is configured to execute the method of the utility model according to the instructions in the program code stored in the memory.

[0057] By way of example and not limitation, computer readable media include computer storage media and communication media. Computer storage media stores information such as computer readable instructions, data structures, program modules or other data. Communication media generally embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information delivery media. Combinations of any of the above are also included within the scope of computer readable media.

[0058] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0059] Although the utility model has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the utility model described herein. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for the purpose of explaining or limiting the subject matter of the utility model. Therefore, many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the utility model is illustrative rather than restrictive with respect to the scope of the utility model, and the scope of the utility model is defined by the appended claims.

[0060] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solar energy and air source heat pump combined heating system, characterized in that: Includes solar thermal collectors, air source heat pumps, hot water storage tanks, heat users and controllers; The air source heat pump comprises an evaporator, a compressor and a condenser which are respectively connected to form a circulation loop through pipelines, and a fan arranged corresponding to the evaporator; a refrigerant pipe and a first heat exchange pipe are arranged in the condenser, and the two ends of the refrigerant pipe are respectively connected to the compressor and the evaporator; a second heat exchange pipe and a third heat exchange pipe are arranged in the hot water storage tank; The water outlet end of the solar thermal collector is respectively connected to one end of the evaporator and one end of the first pipe, and the other end of the first pipe is respectively connected to the water outlet end of the first heat exchange pipe and the water inlet end of the second heat exchange pipe; the water inlet end of the solar thermal collector is respectively connected to the other end of the evaporator and one end of the second pipe, and the other end of the second pipe is respectively connected to the water inlet end of the first heat exchange pipe and the water outlet end of the second heat exchange pipe; the water inlet end and the water outlet end of the third heat exchange pipe are respectively connected to the two ends of the heat user; The solar collector is provided with a solar radiation intensity sensor, a first temperature sensor is provided at the water outlet of the solar collector, a second temperature sensor is provided at the water inlet of the solar collector, a third temperature sensor is provided at the water outlet of the second heat exchange tube, and a fourth temperature sensor is provided at the water outlet of the third heat exchange tube. The solar radiation intensity sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor, and the fourth temperature sensor are electrically connected to the controller respectively; A first solenoid valve is provided on the first pipeline, a second solenoid valve is provided between the water inlet end of the solar collector and the evaporator, a third solenoid valve is provided on the second pipeline, and a fourth solenoid valve is provided at the water inlet end of the first heat exchange tube, and the first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve are electrically connected to the controller respectively; A first water pump is provided between the water inlet end of the solar collector and the evaporator, a second water pump is provided at the water outlet end of the second heat exchange tube, and a variable frequency water pump is provided at the water outlet end of the third heat exchange tube. The first water pump, the second water pump and the variable frequency water pump are electrically connected to the controller respectively.

2. The solar energy and air source heat pump combined heating system according to claim 1 is characterized in that: The evaporator includes an inner sleeve, an outer sleeve sleeved outside the inner sleeve, and a plurality of fins; the plurality of fins are arranged in parallel to form a fin array; each fin is provided with a plurality of through holes, and the inner sleeve and the outer sleeve pass through the through holes on each fin in the fin array in a Z shape; the two ends of the inner sleeve are respectively connected to the compressor and the condenser, and the two ends of the outer sleeve are respectively connected to the water outlet and the water inlet of the solar collector.

3. The solar energy and air source heat pump combined heating system according to claim 1 or 2, characterized in that: A throttle valve is arranged between the condenser and the evaporator.

4. The solar energy and air source heat pump combined heating system according to claim 1 or 2, characterized in that: A fifth solenoid valve is provided at the water outlet end of the third heat exchange tube, and the fifth solenoid valve is electrically connected to the controller.

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