CN215336613U - Series-parallel heat pump system of solar heat collector heat source - Google Patents

Series-parallel heat pump system of solar heat collector heat source Download PDF

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Publication number
CN215336613U
CN215336613U CN202120591453.1U CN202120591453U CN215336613U CN 215336613 U CN215336613 U CN 215336613U CN 202120591453 U CN202120591453 U CN 202120591453U CN 215336613 U CN215336613 U CN 215336613U
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heat
heat pump
water tank
solar
way valve
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尹佳佳
周向民
蒋荣辉
段纪成
杨博
田玉宝
张立臣
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Xi'an Lianchuang Distributed Renewable Energy Research Institute Co ltd
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Xi'an Lianchuang Distributed Renewable Energy Research Institute Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/20Solar thermal
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

The utility model discloses a series-parallel heat pump system of a solar heat collector heat source, which comprises a heat pump system, a solar heat collector system, a hot water tank, a heating water tank, a heat storage water tank and a heat pump working medium preheater, wherein the heat pump system comprises a heat pump system, a heat collector system, a heat storage water tank and a heat pump working medium preheater; the solar heat collector system comprises a solar heat collector, a first three-way valve, a second three-way valve, a third three-way valve and a heat exchange pipeline; the heat pump system comprises a first closed loop and a second closed loop, the first closed loop comprises a heat pump evaporator, a heat pump condenser, a compressor and an expansion valve, and the heat pump evaporator is arranged at the upper part in the heat storage water tank; the second closed loop provides heat for the hot water tank and the heating water tank. According to the utility model, the heat pump working medium preheater is additionally arranged between the user side and the heat storage water tank in the solar heat collector loop, so that the heat absorbed by the solar heat collector loop is utilized to a greater extent, the temperature of the heat pump loop working medium before entering the heat pump condenser is increased, the overall operation efficiency of the heat pump system is improved, and energy conservation and consumption reduction are realized.

Description

Series-parallel heat pump system of solar heat collector heat source
Technical Field
The utility model belongs to the field of heat pumps, and particularly relates to a series-parallel heat pump system of a heat source of a solar heat collector.
Background
With the increasing demand of heat supply, the amount of energy put into heat supply is increasing. The traditional heating mode adopts raw materials such as coal to supply heat, and not only needs to consume a large amount of fossil energy and causes energy shortage, but also can cause environmental problems such as climate warming and haze weather frequency. The heat pump technology converts low-grade heat energy into high-grade heat energy for utilization by consuming a small part of electric energy, and has the advantages of environmental protection, energy conservation, high energy efficiency ratio and the like, so that the heat supply by utilizing the heat pump technology is widely researched by experts and scholars at home and abroad. China also actively promotes the clean heating mode, actively carries out the action of changing coal into electricity and focuses on promoting the clean heating project.
At present, heat pump heating technologies are mainly classified into the following types according to the difference of low-grade heat sources: air source heat pump: the air source heat pump extracts and converts low-grade heat sources in the air into available high-grade heat sources by consuming a part of electric energy to supply heat. The equipment investment cost of the air source heat pump is lower compared with that of other types of heat pumps, and as the heat source of the air source heat pump comes from air in the environment, no special requirement exists on the regional requirement of the equipment; water source heat pump: the water source heat pump mostly adopts surface lake water or underground water as a heat source, a heat pump system is utilized to convert low-grade heat energy in natural water into usable high-grade heat energy, the temperature of the heat source of the water source heat pump is generally stable (particularly underground water), and the coefficient of performance of a unit system is relatively high; a ground source heat pump: the ground source heat pump system with drilling probe has medium and deep stratum soil as heat source to extract low grade underground heat and convert the low grade underground heat into heat energy for heat utilization. Due to the relative stability of the ground temperature and the inverse variability of the ground temperature relative to the ambient temperature, the unit performance coefficient of the ground source heat pump is generally higher.
The above prior art has some problems: the air source heat pump system is greatly influenced by the ambient temperature because the heat source is air, particularly in winter, the ambient temperature is low, the heat pump cannot operate efficiently and stably, the problems of heating discomfort, frequent starting and stopping of the compressor and the like are caused, and the annual comprehensive performance coefficient is low. In addition, the air-source heat pump has a noise problem, and the noise of the air-source heat pump is larger than that of other heat pumps, which are important factors limiting the development of the air-source heat pump; the water source heat pump system is greatly influenced by regional limitation and is difficult to popularize in the ground surface and underground water resource deficient areas, and in addition, because of environmental protection requirements and local policy regulations, the local government permission is required to be obtained before a heat pump heating system is established by using a water source as a heat source; the ground source heat pump system needs drilling during construction, so that the whole unit cost is high, and the heat balance problem of underground soil and the heat exchange problem of a buried pipe are relatively complex. Furthermore, due to the existence of drilling operations, ground source heat pumps are not available in all locations, especially in urban areas.
In summary, there is a need to research an environmental protection heating technology, i.e. a low-grade heat source with less restriction on regions and seasons, lower cost and higher annual performance coefficient.
Disclosure of Invention
The utility model aims to provide a hybrid heat pump system of a heat source of a solar heat collector, aiming at the adverse effect on the application of heat supply of a heat pump caused by the shortage of the heat source in the existing heat pump system.
In order to achieve the purpose, the utility model adopts the following technical scheme to solve the problem:
a series-parallel heat pump system of a solar heat collector heat source comprises a heat pump system, a solar heat collector system, a hot water tank, a heating water tank, a heat storage water tank and a heat pump working medium preheater; wherein:
the solar heat collector system comprises a solar heat collector, a first three-way valve, a second three-way valve, a third three-way valve and a heat exchange pipeline, wherein the first three-way valve is arranged at a water outlet of the solar heat collector, a 2 nd port of the first three-way valve is connected with the second three-way valve through the heat exchange pipeline, and a 3 rd port of the third three-way valve is connected after the heat exchange pipeline connected with the 2 nd port and the 3 rd port of the second three-way valve respectively passes through a hot water tank and a heating water tank; a heat exchange pipeline connected with the 2 nd port of the third three-way valve sequentially passes through the heat pump working medium preheater and the heat storage water tank and then is connected with a water inlet of the solar heat collector; the 1 st port of the third three-way valve is connected with the 3 rd port of the first three-way valve;
the heat pump system comprises a first closed loop and a second closed loop, wherein the first closed loop comprises a heat pump evaporator, a heat pump condenser, a compressor and an expansion valve, the heat pump evaporator is arranged at the upper part in the heat storage water tank, and the heat pump working medium preheater is positioned on a pipeline between the heat pump evaporator and the compressor; a pipeline of a water outlet of the heat pump evaporator is connected with an inlet of a compressor after passing through a heat pump working medium preheater and the heat pump evaporator, an outlet pipeline of the compressor is connected with a heat pump condenser, and an outlet pipeline of the heat pump condenser is connected with a water inlet of the heat pump evaporator through an expansion valve to form a first closed loop;
the second closed loop provides heat for the hot water tank and the heating water tank.
Furthermore, the second closed loop comprises a fourth three-way valve, and after an outlet heat exchange pipeline of the heat pump condenser is respectively connected with water inlet pipelines of the hot water tank and the heating water tank through the fourth three-way valve, water outlet pipelines of the hot water tank and the heating water tank are connected with an inlet of the heat pump condenser.
Furthermore, in the hot water storage tank, a pipeline of the heat pump evaporator is arranged above a pipeline of the solar heat collector system.
Furthermore, temperature sensors are respectively arranged at the hot water tank and the heating water tank.
Further, the working medium type in the first closed loop of the heat pump system is R134 a.
Compared with the prior heat pump system, the heat pump system has the following beneficial effects:
1. solar energy is used as the only low-temperature heat source of the heat pump, a hot water pipeline system and a heating pipeline system are independently arranged at a heat terminal, and heating and hot water supply are realized simultaneously.
2. By adopting the system, the solar thermal collector is independently utilized to supply heat in summer, the requirement of residents can be basically met, the heat absorbed by the solar thermal collector in winter can not meet the use requirement, and can be stored in the heat storage water tank firstly and then used as a low-grade heat source of the heat pump, so that the evaporation temperature of the heat pump is improved, the operation performance of the heat pump is optimized, and the energy is saved.
3. The arrangement mode that the heat pump evaporator is arranged above the solar heat exchanger is arranged below the solar heat exchanger in the heat storage water tank, so that water at the bottom flows upwards after being heated, the natural convection of cold water and hot water is utilized, the heat exchange effect is optimized, and the performance is optimized compared with the traditional parallel arrangement mode.
4. The purpose of heat energy gradient utilization is achieved by additionally arranging a heat exchange device (namely a working medium preheater of a heat pump), and the energy utilization rate is improved. The heat exchange equipment is positioned between the user end and the heat storage water tank in the solar heat collector loop, namely after the heat is used for life, the heat is firstly provided as the high-temperature side in the heat exchanger, and then the rest heat is stored in the heat storage water tank. In the heat pump loop, the heat exchange equipment is positioned between the heat pump evaporator and the compressor, namely after the working medium in the heat pump loop absorbs heat in the heat pump evaporator, the working medium continuously flows through the heat exchange equipment (heat pump working medium preheater) to further absorb heat. Therefore, the heat absorbed by the solar heat collector loop is utilized to a greater extent, the temperature of the working medium of the heat pump loop before entering the heat pump condenser is increased, the overall operation efficiency of the heat pump system is improved, and energy conservation and consumption reduction are realized.
The utility model combines and utilizes the heat pump heat supply technology and the solar heat supply technology to obtain the heat supply system taking the solar heat collector as the only heat source, the advantages of the heat supply system and the solar heat collector are complementary, and the purpose that 1+1 is more than 2 is achieved. The new system achieves the purposes of reducing cost, improving efficiency and stability and reducing frosting, and the construction threshold of the system is lower, and the system can be constructed in common cities and rural areas.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of temperature changes of working media on the front side and the rear side of heat exchange in a user side heat exchanger.
The utility model is further explained below with reference to the drawings and the detailed description.
Detailed Description
As shown in fig. 1, the series-parallel heat pump system of the solar heat collector heat source provided by the utility model comprises a heat pump system, a solar heat collector system, a hot water tank, a heating water tank, a heat storage water tank and a heat pump working medium preheater.
The solar heat collector system comprises a solar heat collector, a first three-way valve, a second three-way valve, a third three-way valve and a heat exchange pipeline. The first three-way valve is arranged at a water outlet of the solar heat collector, a 2 nd port of the first three-way valve is connected with the second three-way valve through a heat exchange pipeline, and a 3 rd port of the third three-way valve is connected after the heat exchange pipeline connected with the 2 nd port and the 3 rd port of the second three-way valve respectively passes through the hot water tank and the heating water tank; a heat exchange pipeline connected with the 2 nd port of the third three-way valve sequentially passes through the heat pump working medium preheater and the heat storage water tank and then is connected with a water inlet of the solar heat collector; the 1 st port of the third three-way valve is connected to the 3 rd port of the first three-way valve.
The second three-way valve is used to control different heating and hot water requirements. The third three-way valve is used for controlling the hot water in the solar heat collector to directly flow into the heat pump working medium preheater or to firstly flow through the hot water tank or the heating water tank and then flow into the heat pump working medium preheater.
The heat pump system comprises a first closed loop (working medium loop) and a second closed loop (heat supply loop), wherein the first closed loop comprises a heat pump evaporator, a heat pump condenser, a compressor and an expansion valve. The heat pump working medium preheater is positioned on a pipeline between the heat pump evaporator and the compressor; a pipeline of a water outlet of the heat pump evaporator is connected with an inlet of a compressor after passing through a heat pump working medium preheater and the heat pump evaporator, an outlet pipeline of the compressor is connected with a heat pump condenser, and an outlet pipeline of the heat pump condenser is connected with a water inlet of the heat pump evaporator through an expansion valve to form a first closed loop; the type of the medium in the closed loop is R134 a.
The second closed loop comprises a fourth three-way valve, after an outlet heat exchange pipeline of the heat pump condenser is respectively connected with water inlet pipelines of the hot water tank and the heating water tank through the fourth three-way valve, water outlet pipelines of the hot water tank and the heating water tank are connected with an inlet of the heat pump condenser, and the fourth three-way valve is used for controlling heating and hot water supply requirements.
Preferably, in the hot water storage tank, the pipeline of the heat pump evaporator is arranged above the pipeline of the solar heat collector system. Because the pipeline of the solar heat collector system is a heat release part, the pipeline of the heat pump evaporator is a heat absorption part, the heat released by the pipeline of the solar heat collector system heats the working medium nearby the pipeline, and the high-temperature working medium nearby the pipeline can flow upwards under the effects of cold-heat convection and the like, so that the convection circulation of the working medium can be formed in the heat storage water tank, the heat exchange effect is enhanced, and the heat prevention effect of the pipeline of the solar heat collector system and the heat absorption effect of the pipeline of the heat pump evaporator are promoted.
Preferably, temperature sensors are installed at the hot water tank and the heating water tank for monitoring the temperature in the tank. The hot water tank is connected with a user side hot water supply system through a pipeline, and the heating water tank supplies heat to a user room area through a heating system pipeline.
The control process of the utility model is as follows:
in the solar collector loop: when working media in a solar thermal collector are transferred to a hot water tank and a heating water tank, when the temperature monitored by a temperature sensor meets the requirement of using hot water or heating at a user side, the solar thermal collector is adopted for direct heat supply, the specific process is that a port 1 and a port 2 of a first three-way valve are opened, ports 1, 2 and 3 of a second three-way valve are opened, a port 2 and a port 3 of a third three-way valve are opened, the working media flow out of the solar thermal collector and enter the heating water tank and the hot water tank for heat exchange, the working media flow into a heat pump working medium preheater through the third three-way valve after heat exchange to heat a heat pump working medium, the working media flow into a heat storage water tank after heating for heat exchange, and the residual heat is stored; when working medium in the solar thermal collector is transferred to the hot water tank and the heating water tank, when the temperature monitored by the temperature sensor does not meet the requirement of using hot water or heating by a user side, the 2 nd port of the first three-way valve is closed, the 3 rd port of the first three-way valve is opened, the 3 rd port of the third three-way valve is closed, the 1 st port of the third three-way valve is opened, the working medium in the solar thermal collector directly flows into the heat pump working medium preheater through the third three-way valve after flowing out to heat the heat pump working medium, and then the working medium continuously flows into the heat storage water tank to exchange heat and store the residual heat.
In the scheme, no matter whether the temperature of the working medium in the solar heat collector after absorbing heat meets the use requirement of a user side, the working medium flows through the heat pump working medium preheater to further heat the heat pump working medium flowing out of the heat pump evaporator before flowing into the heat storage water tank, so that the evaporation temperature of the heat pump working medium is increased, the performance of a heat pump system is optimized, energy is saved, and consumption is reduced.
In a first closed loop (working medium loop) of the heat pump system, a refrigerant working medium is firstly evaporated and absorbed in a heat pump evaporator, heat in a heat storage water tank is absorbed, then the refrigerant working medium flows out of the heat pump evaporator, flows into a heat pump working medium preheater to further absorb heat, further increases the temperature of the working medium, then flows out of the heat pump working medium preheater, is in a high-temperature low-pressure state at the moment, then flows into a compressor to pressurize, flows out of a high-temperature high-pressure working medium, then flows into a heat pump condenser, and is condensed to release heat. In the pipeline, the working medium is in a low-temperature high-pressure state after condensation and heat release, further flows into an expansion valve, the working medium is changed into a low-temperature low-pressure state, and then enters a heat pump evaporator to start the next cycle.
In a second closed loop (heat supply loop) of the heat pump system, a pipeline on the other side in the condenser absorbs heat released by condensation of working media, and then supplies heat to the hot water tank and the heating water tank. The second closed loop of the heat pump system is a heat supply loop, heat absorbed by the heat pump evaporator is transmitted out through the heat pump condenser and the heat exchange pipeline, the heat exchange pipeline is led to the hot water tank and the heating water tank after the heat pump condenser absorbs the heat, the heat is released into the hot water tank and the heating water tank to supply heat, a fourth three-way valve is arranged on the way to the heat exchangers in the hot water tank and the heating water tank, and the fourth three-way valve is used for controlling heating demands and hot water supply demands.
Therefore, in the scheme of the utility model, the purpose of gradient utilization of heat energy is achieved by additionally arranging the heat exchange equipment (namely the working medium preheater of the heat pump), and the energy utilization rate is improved. The heat exchange equipment is positioned between the user side and the heat storage water tank in the solar heat collector loop, namely after the heat is used for life, heat is provided as a high-temperature side in the heat exchange equipment, and then the rest heat is stored in the heat storage water tank. In the heat pump loop, the heat exchange equipment is positioned between the heat pump evaporator and the compressor, namely after the working medium in the heat pump loop absorbs heat in the heat pump evaporator, the working medium continuously flows through the heat exchange equipment (heat pump working medium preheater) to further absorb heat. Therefore, the heat absorbed by the solar heat collector loop is utilized to a greater extent, the temperature of the working medium of the heat pump loop before entering the heat pump condenser is increased, the overall operation efficiency of the heat pump system is improved, and energy conservation and consumption reduction are realized.
The explanation about the heat pump working medium preheater that the temperature of the high-temperature side pipeline is always greater than that of the low-temperature side pipeline is as follows: the working medium at the high temperature side in the heat exchange equipment (heat pump working medium preheater) flows in after being used by the user side, so the temperature of the working medium after heat supply of the user side needs to be concerned, as shown in fig. 2, the temperature change of working media at the front side and the rear side of the heat exchanger at the heat using terminal is shown, it can be seen that in summer or winter, the temperature of the working medium in the solar heat collector loop after heat exchange for the user side and flowing out is higher than the current environmental temperature, the low-temperature side working medium in the heat pump working medium preheater is the working medium of the heat pump flowing in after absorbing heat in the heat pump evaporator, the heat absorbed by the heat pump evaporator comes from the heat storage water tank, the heat source in the heat storage water tank is the working medium heat after the heat supply of the high-temperature side working medium in the heat pump working medium preheater, therefore, the temperature of the heat pump working medium after absorbing heat in the heat pump evaporator is always lower than the temperature of the working medium at the high temperature side in the middle heat exchange device (heat pump working medium preheater).
In addition, the heat pump system loop itself is a single stage device with variable speed drive for capacity control. The heat pump system is divided into two paths at the heat terminal utilization part, wherein the heating water tank is used for heating houses/small buildings, the temperature can be kept between 50 and 60 ℃, the hot water tank is used for providing domestic/domestic hot water, and the temperature can be kept between 40 and 50 ℃ all the year round.
In a heat pump system, the annual system coefficient of performance is obtained by measuring the parameters of temperature, volume flow, pressure, electrical power, solar radiation and valve position.
The positions of all measured parameters are shown in fig. 1. T represents a temperature monitoring instrument at the position; v represents a volume flow monitoring instrument at the position; p represents the site pressure monitoring instrument. Wherein, the temperature sensor adopts a thermocouple; volumetric flow is measured using an inductive flow sensor; piezoresistive transducers used for pressure measurement; the electrical power is measured by a true rms power meter; solar radiation is measured with a sensor; the position of each valve is measured with a low voltage signal; and storing the acquired data by using the data acquisition system as a data acquisition unit.
The system will be suitable for most climates and the performance of the system is superior to conventional air source heat pumps. In new systems, solar collectors are the primary energy source. In hot weather conditions, such as part of the summer and spring (fall), the solar collector supplies heat directly to the hot water tank or heating system. If the temperature required by hot water heating or room heating cannot be reached, or excessive heat is generated in summer, the heat of the solar heat collector is stored in a large water tank. The water tank is manufactured into a heat storage water tank, water is mainly used as a system heat storage material for sensible heat storage, the heat storage water tank is a low-grade heat source of a heat pump in the system, and the temperature of the heat storage water tank can be kept to be not lower than 10 ℃. During long periods of inclement weather, electrical emergency heating systems may be used as a backup solution for heat pump systems.
The utility model not only solves the weather dependence of the solar heat collector, but also improves the evaporation temperature of the heat pump, and the annual heat source temperature is higher, so that the higher evaporation temperature can be maintained, and the efficiency is higher. Furthermore, the heat source (solar collector) can be easily installed on most buildings, usually without special licenses. Finally, because the heat source heat of the heat pump comes from the solar collector, noise pollution to the environment can not be generated.
Example (b):
taking a two-storey independent building in northern China as an example for experimental research, the main heating parameters and building parameters of the building are as follows:
solar heat collector, 9m2
10m heat storage water tank3Wherein the heat storage medium is water, and the heat storage temperature range is 0-90 DEG C
200L of each of the household hot water tank and the heating system water tank
Heat pump evaporator is a stainless steel tube with the outer diameter of 18mm and the length of 50m
The heat supply capacity of the heat pump is 3-6 kW
The heat supply load in winter is 5.9kW calculated according to the national standard GB/T18883-
Building heating area; 150m2
The prior building mainly adopts the earth heating to heat coal for supplying heat (including heating and hot water), has the problems of insufficient coal combustion, low heat efficiency and the like, causes a large amount of energy waste, and simultaneously can generate a large amount of SO by combustion2、CO2And the like, causing environmental pollution. After the heat pump heating system is installed, the defects are overcome to a great extent, and clean heat supply conversion is realized.
For two different heating modes, the initial installation cost and the running cost during the use of the different modes are mainly analyzed, namely the total life cycle cost is the initial cost plus the running cost (annual running cost multiplied by service life). Maintenance and removal costs are not considered.
The local heating is generally self-built, and the initial installation cost is generally lower, namely 40 yuan/m through field research2The operating cost is generally 27 yuan/m per year2. The initial assembly cost of the heat pump system (considering the parts of the heat pump, the solar heat collector and the like) is generally 200 yuan/m2(the self-payment cost of farmers is reduced if policy is supported), and the consumption of electric energy is greatly reduced due to the use of the solar heat collector as the main energy source, so that the operation cost is about 6 yuan/m per year2
After one heating season (12 months to 4 months), the cost of the two heating modes is respectively as follows:
heating by using the earth: 27 × 150 ═ 4050 yuan
Solar heat pump system: 6 x 150 is 900 yuan
The initial investment is different from the initial investment: (200-40). times.150 ═ 24000X
Years of moderate investment: 24000/(4050-900) for 7.6 years.
From the above calculations, it can be seen that after the 7 th year, the total cost of the solar heat pump system will be less than the cost of the earth heating system for heat supply. Through market research, the service life of the heat pump is generally 15-20 years, and the service life of the self-built earth heating is shorter. In addition, the heat pump system can simultaneously heat and provide domestic hot water for all the year of a resident, and the local heating also needs to consume additional energy (in an electric heating mode and the like) to obtain the domestic hot water, so that additional cost is increased. Therefore, compared with the prior art, the solar heat pump heating system has higher competitive potential.
Through measurement and evaluation of a heating period, the annual performance coefficient of the heating system is 2.4 and is better than that of an air source heat pump by analyzing and calculating the acquired parameters such as temperature, pressure and the like.
The above data show that the heat pump system of the present invention has higher efficiency and lower noise compared to the air source heat pump, and is a heating system with more advantages compared to the water source heat pump and the ground source heat pump, which have smaller restriction in area and policy and lower cost. In conclusion, the system has higher economic competitive potential in the long run, and meanwhile, clean heat supply is realized, and the effects of energy conservation and emission reduction are achieved.

Claims (5)

1. A series-parallel heat pump system of a solar heat collector heat source is characterized by comprising a heat pump system, a solar heat collector system, a hot water tank, a heating water tank, a heat storage water tank and a heat pump working medium preheater; wherein:
the solar heat collector system comprises a solar heat collector, a first three-way valve, a second three-way valve, a third three-way valve and a heat exchange pipeline, wherein the first three-way valve is arranged at a water outlet of the solar heat collector, a 2 nd port of the first three-way valve is connected with the second three-way valve through the heat exchange pipeline, and a 3 rd port of the third three-way valve is connected after the heat exchange pipeline connected with the 2 nd port and the 3 rd port of the second three-way valve respectively passes through a hot water tank and a heating water tank; a heat exchange pipeline connected with the 2 nd port of the third three-way valve sequentially passes through the heat pump working medium preheater and the heat storage water tank and then is connected with a water inlet of the solar heat collector; the 1 st port of the third three-way valve is connected with the 3 rd port of the first three-way valve;
the heat pump system comprises a first closed loop and a second closed loop, wherein the first closed loop comprises a heat pump evaporator, a heat pump condenser, a compressor and an expansion valve, the heat pump evaporator is arranged at the upper part in the heat storage water tank, and the heat pump working medium preheater is positioned on a pipeline between the heat pump evaporator and the compressor; a pipeline of a water outlet of the heat pump evaporator is connected with an inlet of a compressor after passing through a heat pump working medium preheater and the heat pump evaporator, an outlet pipeline of the compressor is connected with a heat pump condenser, and an outlet pipeline of the heat pump condenser is connected with a water inlet of the heat pump evaporator through an expansion valve to form a first closed loop;
the second closed loop provides heat for the hot water tank and the heating water tank.
2. The series-parallel heat pump system of a solar heat collector heat source as claimed in claim 1, wherein the second closed loop comprises a fourth three-way valve, and after the outlet heat exchange pipeline of the heat pump condenser is connected with the inlet pipelines of the hot water tank and the heating water tank through the fourth three-way valve, the outlet pipelines of the hot water tank and the heating water tank are connected with the inlet of the heat pump condenser.
3. The series-parallel heat pump system of a solar collector heat source as claimed in claim 1, wherein the heat pump evaporator piping is arranged above the solar collector system piping in the hot water storage tank.
4. The series-parallel heat pump system of a solar collector heat source according to claim 1, wherein temperature sensors are installed at both the hot water tank and the heating water tank.
5. The series-parallel heat pump system for a solar collector heat source according to claim 1, wherein the working medium type in the first closed loop of the heat pump system is R134 a.
CN202120591453.1U 2021-03-23 2021-03-23 Series-parallel heat pump system of solar heat collector heat source Active CN215336613U (en)

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