CN114060890A - Photo-thermal and photo-electric co-production energy cascade heating system based on Stirling engine - Google Patents

Photo-thermal and photo-electric co-production energy cascade heating system based on Stirling engine Download PDF

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Publication number
CN114060890A
CN114060890A CN202111367562.6A CN202111367562A CN114060890A CN 114060890 A CN114060890 A CN 114060890A CN 202111367562 A CN202111367562 A CN 202111367562A CN 114060890 A CN114060890 A CN 114060890A
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China
Prior art keywords
water
heating
heat
pipeline
circulation loop
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CN202111367562.6A
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Chinese (zh)
Inventor
周政翰
刘实
赵海湉
林波荣
官名昊
朱宁
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Tsinghua University
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Tsinghua University
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Priority to CN202111367562.6A priority Critical patent/CN114060890A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps

Abstract

The application provides a light and heat photoelectricity coproduction energy cascade heating system based on stirling, and it includes stirling, cooling tower, hot water storage tank, heat transfer coil and air source heat pump. The heat storage water tank and the Stirling engine are connected end to form a circulation loop; the cooling tower and the Stirling engine are connected end to form a circulation loop, and the cooling tower and the heat storage water tank are arranged in parallel; the heat exchange coil is arranged in the heat storage water tank and is used for being connected with heating equipment end to form a heating circulation loop; the air source heat pump is arranged in the heating circulation loop and is arranged to be capable of switching between series connection and parallel connection in the heating circulation loop, and the Stirling machine and/or the air source heat pump provides heat for the heating device through circulating water. The application realizes photo-thermal and photo-electric cogeneration through the Stirling engine, and cascade energy supplement is carried out through the air source heat pump, so that the solar energy conversion efficiency is extremely high.

Description

Photo-thermal and photo-electric co-production energy cascade heating system based on Stirling engine
Technical Field
The application relates to the field of building heating, in particular to a photo-thermal and photoelectric co-production energy cascade heating system based on a Stirling engine.
Background
In winter, heating mainly takes coal and natural gas as main materials, energy consumption is high, and a large amount of carbon dioxide is generated in the combustion process. If the central air conditioner is adopted to supply warm air for heating, the power consumption of unit area is higher. The efforts of heating in the direction of energy saving and low carbon are mainly on system optimization and heating equipment improvement, and the fact that the large amount of carbon dioxide emission is required is still not changed from the aspect of heat source.
The residences such as a few villas can be heated by the photo-thermal system at present. The general working principle is that water is used for cooling the photovoltaic panel to obtain heat, then the water is stored in the water tank, and heating water and water in the water tank flow in the floor heating coil after heat exchange so as to supply heat indoors. Or heating is carried out by adopting an electric heating or electric driving air source heat pump mode through a photoelectric heating system.
However, such heating systems using renewable energy are still under development and are not widely put into practical use. The conversion times of the energy forms are more, and the working efficiency of the heating system is lower. For example, the photoelectric efficiency is generally 20% to 30%.
Disclosure of Invention
In order to improve the utilization efficiency of renewable energy, the application provides a photothermal-photoelectric co-production energy cascade heating system based on a Stirling engine.
This light and heat photoelectricity coproduction energy cascade heating system based on stirling includes:
the heat storage water tank and the Stirling machine are connected end to form a circulation loop;
the cooling tower and the Stirling engine are connected end to form a circulation loop, and the cooling tower and the heat storage water tank are arranged in parallel;
the heat exchange coil is arranged in the heat storage water tank and is used for being connected with heating equipment end to form a heating circulation loop; and
an air source heat pump disposed in the heating cycle and configured to be switchable between series and parallel in the heating cycle,
the Stirling engine and/or the air source heat pump provide heat for the heating equipment through circulating water.
In at least one embodiment, the circulation circuit formed by the heat storage water tank and the stirling machine and the circulation circuit formed by the cooling tower and the stirling machine are arranged to be capable of adjusting the on-off state according to the temperature of water participating in circulation.
In at least one embodiment, a temperature sensor is arranged at an opening of the heat storage water tank for connecting to the stirling machine, and a temperature sensor is arranged at the upstream of a water return connection point or the downstream of a water supply connection point of the heat storage water tank and the cooling tower.
In at least one embodiment, the Stirling machine-based photothermal and photoelectric co-production energy cascade heating system comprises the heating equipment,
the heating equipment comprises a floor heater, the floor heater comprises a floor heating coil, and the floor heating coil and the heat exchange coil are connected end to form a circulation loop; and/or
The heating equipment comprises an air conditioner, the air conditioner comprises a fan coil, the fan coil and the heat exchange coil are connected end to form a circulation loop,
and under the condition that the heating equipment simultaneously comprises the floor heating coil and the fan coil, the floor heating coil and the fan coil are arranged in parallel.
In at least one embodiment, a temperature sensor is provided at the upstream connection point of the floor heating coil and/or the fan coil.
In at least one embodiment, a valve is arranged in the heating circulation loop, the air source heat pump is connected with the valve in parallel, and the air source heat pump is switched between being connected in series and being connected in parallel in the heating circulation loop by controlling the on-off of the valve.
In at least one embodiment, the heating circulation loop includes a water supply pipeline, a water return pipeline and a water mixing pipeline, the heat exchange coil, the water supply pipeline, the heating device and the water return pipeline are connected end to end, and the water mixing pipeline is connected to the water supply pipeline and the water return pipeline, so that water in the water return pipeline can return to the water supply pipeline without passing through the heat exchange coil.
In at least one embodiment, the connection point of the water mixing pipeline and the water supply pipeline is provided with a water mixing center, and the water mixing center is used for controlling the opening and closing degree of the water mixing pipeline.
In at least one embodiment, the heating circulation loop includes an isolation line connected to the water supply line and the water return line such that water in the water return line can return to the water supply line without passing through the heat exchange coil,
the water supply pipeline and the water return pipeline between the water mixing pipeline and the isolation pipeline can be controlled to be on and off.
In at least one embodiment, an expansion tank is provided in the heating circulation loop for maintaining a water pressure in the heating circulation loop.
The application realizes photo-thermal and photo-electric cogeneration through the Stirling engine, and cascade energy supplement is carried out through the air source heat pump, so that the solar energy conversion efficiency is extremely high.
Drawings
Fig. 1 shows a schematic structural diagram of a stirling machine-based photothermal and photoelectric cogeneration energy cascade heating system according to an embodiment of the present application.
Description of the reference numerals
1 a stirling machine; 2, cooling the tower; 3 a first circulation pump; 4, a heat storage water tank; 41 heat exchange coil pipe; 5 mixing water center; 6, an expansion tank; 7 a second circulation pump; 8, an air source heat pump; 9, a floor heating coil pipe; 10 fan coil;
water pipes of P1, P2, P3, P4, P5, P6, P9, P12, P13, P14, P15 and P16; a P7 water supply line; a P8 water return pipeline; p10 mixing water line; p11 isolation line;
v1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12 valves;
t1, T2, T3, T4, T5 and T6 temperature sensors.
Detailed Description
Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.
Referring to fig. 1, the present application provides a stirling engine-based photothermal-photoelectric co-production energy cascade heating system (hereinafter, referred to as "heating system").
Exemplarily, the heating system comprises a stirling engine 1, a cooling tower 2, a first circulating pump 3, a hot water storage tank 4, a water mixing center 5, an expansion tank 6, a second circulating pump 7, an air source heat pump 8, heating equipment (a floor heating coil 9, a fan coil 10), a plurality of water pipes, a valve, a temperature sensor and the like.
The Stirling engine 1 is an externally heated closed cycle engine, and can gather sunlight to drive a generator to generate electricity and do work. The cold water passes through the stirling engine 1, and can obtain heat while cooling the stirling engine 1.
The cooling tower 2 serves to cool water flowing therethrough.
The air source heat pump 8 can heat water flowing therethrough.
Heating equipment can warm up including warm up, warms up including floor heating coil 9, and floor heating coil 9 can set up below the floor of building, has certain thermal water through bearing, for building heating.
The heating device may comprise an air conditioner comprising a fan coil 10, which fan coil 10 may be arranged in the air conditioning system of the building to heat the pipe wall with water having a certain amount of heat to supply air for heating.
The heating system includes a plurality of cycles, such as cycles 1-8.
Referring now to the drawings, the cycles 1, 2 will be described first. The stirling engine 1 is used as a water supply target, the solid lines in the cycles 1 and 2 represent supply water, and the dotted lines represent return water, and the water used for the cycle is also referred to as "primary water".
(cycle 1)
The hot water storage tank 4 and the stirling engine 1 can be connected end to form the cycle 1. More specifically, the heat storage water tank 4 is connected to a cooling chamber through which the primary water passes in the stirling machine 1, and the photothermal conversion process of the stirling machine 1 is realized by the cycle 1.
Illustratively, the water outlet of the stirling machine 1 is connected to the water inlet of the hot water storage tank 4 through a water pipe P1, and the water outlet of the hot water storage tank 4 is connected to the water inlet of the stirling machine 1 through a water pipe P2. The water inlet and the water outlet are used as the head and the tail of the equipment, and the Stirling engine 1 and the heat storage water tank 4 are connected end to form a circulation loop.
A water line P6 may be connected at the water line P2 and connected to an external water source to supplement water in the heating system. A valve V1 may be provided in the water pipe P6. A drain port may be provided in the water pipe P1, and the drain port may drain the primary water to the trench through the water pipe P16. A valve V2 may be provided at the drain.
The hot water storage tank 4 may be filled with water pipe P5, and the primary water may be replenished through water pipe P5. An outlet is provided at the bottom of the hot water storage tank 4, and the primary water in the hot water storage tank 4 is discharged to the trench through a water pipe P15.
(cycle 2)
The cooling tower 2 and the stirling engine 1 can be connected end to form a cycle 2, and the cooling tower 2 and the heat storage water tank 4 are connected end to end (water inlet connection) and end to end (water outlet connection), even if the cooling tower 2 and the heat storage water tank 4 are arranged in parallel.
Illustratively, water pipe P3 may be connected to water pipe P1, water pipe P4 may be connected to water pipe P2, the water inlet of cooling tower 2 may be connected to water pipe P3, and the water outlet of cooling tower 2 may be connected to water pipe P4. A valve V6 is arranged in the water pipe P3, and a valve V5 is arranged in the water pipe P4.
A temperature sensor T1 and a first circulation pump 3 for driving the circulation 1, 2 to operate smoothly may also be provided in the main path portion (upstream of the return water connection point of the hot-water storage tank 4 and the cooling tower 2 or downstream of the water supply connection point, preferably downstream of the water supply connection point) in the water pipe P2. The branch portions of the water pipe P1 and the water pipe P2 connected to the hot water storage tank 4 are provided with a valve V4 and a valve V3, respectively. The bottom of the hot water storage tank 4 is provided with a temperature sensor T2.
If the temperature sensed by the temperature sensor T1 is lower than 60 ℃, then cycle 1 operates normally; if the temperature sensed by the temperature sensor T1 is higher than 60 ℃, the valves V2, V3 and V4 are closed, and the valves V1, V5 and V6 are opened. At this time, cycle 1 is stopped and cycle 2 is performed.
If the temperature sensed by the temperature sensor T2 is less than 55 deg.C, then the valves V3, V4 are opened and the valves V5, V6 are closed, cycle 1 is performed.
The application has the advantages that the Stirling machine can be used for collecting solar power generation, water for cooling the Stirling machine is also connected into a heating system, and heat is stored as a water circulating transmission and distribution medium. The Stirling engine capable of realizing photo-thermal photoelectric co-production is connected into a heating system, so that the spanning from energy consumption to production and elimination of a user side is realized, and the deep energy conservation of a building is realized.
(cycle 3-8)
The cycle 3-8 is also called a heating cycle as a whole, and the equipment and connection relation thereof are as follows. In the heating circulation circuit, heating equipment (floor heating coil 9, fan coil 10) is used as water supply, a solid line represents water supply, and a dotted line represents return water, and the circulation water is also referred to as "secondary water".
The heat storage water tank 4 is provided with a heat exchange coil 41, and the primary water can transfer heat to the secondary water through the heat exchange coil 41.
The floor heating coil 9 and/or the fan coil 10 can be connected with the heat exchange coil 41 end to form a heating circulation loop. If the floor heating coil 9 and the fan coil 10 exist at the same time, the two are arranged in parallel.
Illustratively, a water supply line P7 and a water return line P8 are connected to the heat exchange coil 41. The water supply pipeline P7 can be branched into water pipes P9 and P13, the water inlet of the floor heating coil 9 is connected to the water pipe P9, and the water outlet of the floor heating coil 9 is connected to the water return pipeline P8; the water inlet of the fan coil 10 is connected to the water pipe P13, the water outlet of the fan coil 10 is connected to the water return pipeline P8, so that the floor heating coil 9 and the fan coil 10 are in parallel connection, and the floor heating coil 9 and the fan coil 10 are connected with the heat exchange coil 41 end to end.
A valve V12 may be provided in the water pipe P9, and a valve V11 may be provided in the water pipe P13.
A second circulation pump 7 may be provided in the water supply line P7 or the water return line P8, and the secondary water circulation flow is driven by the second circulation pump 7.
The air source heat pump 8 may be provided in the water supply line P7 or the water return line P8. Illustratively, a valve V10 is arranged in the water supply pipeline P7, and the air source heat pump 8 is connected in parallel with the valve V10 through a water pipe P12. The air source heat pump 8 is switched between series connection with the water supply line P7 and parallel connection with the water supply line P7 by controlling the on/off of the valve V10. It will be appreciated that the air-source heat pump 8 has a valve (not shown) therein, which is capable of controlling its own on/off.
A mixing water pipeline P10 and an isolation pipeline P11 may be respectively arranged between the hot water storage tank 4 and the air source heat pump 8. The water mixing pipeline P10 is connected with the water supply pipeline P7 and the water return pipeline P8; the isolation pipeline P11 is also connected to a water supply pipeline P7 and a water return pipeline P8, and a valve V9 is arranged in the isolation pipeline P11.
The connection point of the water mixing pipeline P10 and the water supply pipeline P7 can be provided with a water mixing center 5, and the water mixing center 5 can control the passing degree of water in the water mixing pipeline P10 so as to adjust the mixing degree of the backwater of the water mixing pipeline P10 and the water supply of the water supply pipeline P7.
By opening isolation line P11, secondary water can be returned to water supply line P7 without passing through heat exchange coil 41.
The expansion tank 6 may be provided at a position upstream of the water return line P8 (upstream of the connection point of the water return line P8 and the isolation line P11), and the expansion tank 6 serves to maintain the water pressure in the heating circulation circuit stable. A water pipe P14 may be provided at the expansion tank 6 to replenish water to the expansion tank 6 through a water pipe P14. The water pipe P14 may also be connected to a return line P8.
A temperature sensor T3 may be provided between the mixing centre 5 and the hot water storage tank 4.
Downstream of the mixing centre 5, upstream of the connection point of the isolation pipe P11 to the water pipe P7, a temperature sensor T4 may be provided.
A temperature sensor T5 may be provided at the connection point of the water pipes P9, P13.
A temperature sensor T6 that monitors the temperature of the water may be provided in the hot water storage tank 4.
Aiming at different working conditions, the heating system can realize the cascade utilization of energy. In the case of the cycles 1, 2 operating as intended, the operation of the cycles 3-8 will now be described with reference to the actual operating conditions.
Working condition 1: the temperature sensed by the temperature sensor T3 is more than 45 ℃, the temperature sensed by the temperature sensor T6 is more than 45 ℃, and then heat is provided for the secondary water only by the heat storage water tank 4.
(cycle 3)
When the heating equipment is only the floor heating coil 9, the valves V9 and V11 are closed, and the valves V7, V8, V10 and V12 are opened.
The secondary water passes through the water outlet of the heat exchange coil 41, the water supply pipeline P7, the water pipe P9, the floor heating coil 9 and the water return pipeline P8 and enters the heat exchange coil 41 again to form a cycle. Wherein, partial backwater can be mixed with the water supply higher than 45 ℃ in the water supply pipeline P7 through the water mixing pipeline P10, so that the temperature of the mixed water is kept at 45 ℃ (the value monitored by the temperature sensor T4 is 45 ℃).
(cycle 4)
When the heating equipment is only the fan coil 10, the valves V9 and V12 are closed, and the valves V7, V8, V10 and V11 are opened.
The secondary water passes through the water outlet of the heat exchange coil 41, the water supply pipeline P7, the water pipe P13, the fan coil 10 and the water return pipeline P8 and enters the heat exchange coil 41 again to form a cycle. Similarly, part of the backwater may be mixed with the hot water in the supply line P7 at a temperature higher than 45 ℃ via the mixing line P10, so that the temperature of the mixed water is maintained at 45 ℃ (45 ℃ as monitored by the temperature sensor T4).
Working condition 2: the temperature sensed by the temperature sensor T3 is between 35 ℃ and 45 ℃, and the heat storage water tank 4 and the air source heat pump 8 simultaneously supply heat for secondary water.
(cycle 5)
When the heating equipment is only the floor heating coil 9, the valves V9, V10 and V11 are closed, and the valves V7, V8 and V12 are opened. The mixing centre 5 is adjusted to interrupt the flow of water in the mixing line P10.
The secondary water passes through the water outlet of the heat exchange coil 41, the water supply pipeline P7, the air source heat pump 8, the water pipe P9, the floor heating coil 9 and the water return pipeline P8 and enters the heat exchange coil 41 again to form a cycle.
At this point, the air-source heat pump 8 is connected in series into the cycle 5, providing heat with the hot water storage tank 4 for the secondary water.
(cycle 6)
When the heating equipment is only the fan coil 10, the valves V9, V10 and V12 are closed, and the valves V7, V8 and V11 are opened. The mixing centre 5 is adjusted to interrupt the flow of water in the mixing line P10.
The secondary water passes through the water outlet of the heat exchange coil 41, the water supply pipeline P7, the air source heat pump 8, the water pipe P13, the fan coil 10 and the water return pipeline P8 and enters the heat exchange coil 41 again to form a cycle.
Similarly, an air-source heat pump 8 is connected in series to the cycle 6, and together with the hot water storage tank 4 provides heat for the secondary water.
Working condition 3: the temperature sensed by the temperature sensor T3 is less than 35 ℃, and only the air source heat pump 8 provides heat for the secondary water.
(cycle 7)
When the heating equipment is only the floor heating coil 9, the valves V7, V8, V10 and V11 are closed, and the valves V9 and V12 are opened. The temperature of the secondary water is indicated by a temperature sensor T5.
Secondary water passes through the air source heat pump 8, the water pipe P9, the floor heating coil 9, the water return pipeline P8 and the isolation pipeline P11 and enters the air source heat pump 8 again to form a cycle.
(cycle 8)
When the heating equipment is only the fan coil 10, the valves V7, V8, V10 and V12 are closed, and the valves V9 and V11 are opened. Likewise, the temperature of the secondary water is indicated by a temperature sensor T5.
The secondary water passes through the air source heat pump 8, the water pipe P13, the fan coil 10, the water return pipeline P8 and the isolation pipeline P11 and enters the air source heat pump 8 again to form a cycle.
The temperature in each logic judgment mentioned in the present application is only an example, and can be adjusted accordingly according to the actual situation.
The valves mentioned in the present application can be used for controlling on/off, and the specific types are not limited, and for example, the valves can be electromagnetic valves.
In the photo-thermal heating system developed by related enterprises in the industry, once the light energy or other renewable energy sources cannot meet the heating demand, other heating forms with higher energy consumption have to be switched to maintain the heating demand of indoor rooms, which is energy waste.
The application solves the problem through the step energy supplement function of the air source heat pump. This application will heat the partial heat energy that heating water lacks is supplied with the complement by air source heat pump, has realized that air source heat pump "refuels midway" the effect to heating water, more can energy-conserving heating effectively. For example, under the working condition 2, when the temperature of the secondary water is within the range of 35-45 ℃ and has certain heat but is not enough to directly heat a room, the air source heat pump 8 is connected to a heating system to heat the secondary water.
The air source heat pump 8 and the valve V10 are connected in parallel to be connected into a heating system, when needed, the valve V10 is closed, the air source heat pump 8 is connected into the heating system in series, low-temperature hot water is reheated, the low-temperature hot water can be reused only with a small amount of energy consumption, and heat required when cold water is heated to the low-temperature hot water is saved. The system design of the energy cascade utilization can greatly utilize the heat stored in the water tank for heating, and the energy-saving effect is greatly improved.
This application has multicycle linkage complex effect. The heating system can automatically adjust and select intelligent building systems with different heating schemes according to relevant parameters such as indoor environment temperature, heating water temperature and the like. For example, the heating system can realize energy-saving operation under three different working conditions according to different temperatures of secondary hot water; two different forms of floor heating coil 9 heating and fan coil 10 air supply heating can be selected according to the indoor environment temperature. Of course, the floor heating coil 9 and the fan coil 10 can also work simultaneously. The multi-mode heating can be better adapted to different working condition conditions for heating, and can be matched with an intelligent building control system to automatically adjust a heating mode meeting the energy-saving and comfortable requirements of users.
Traditional renewable energy systems can only select photo-thermal or photo-electric systems, and the efficiency is low. And this application realizes light and heat photoelectricity coproduction through the stirling, carries out the step energy through air source heat pump and supplements for solar energy conversion efficiency is high, and light and heat photoelectricity total efficiency can reach more than 90%, can not even insert the electric wire netting under ideal condition, and independent productivity heats.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the application.

Claims (10)

1. The utility model provides a light and heat photoelectricity coproduction energy cascade heating system based on stirling, its characterized in that includes:
the Stirling engine comprises a Stirling engine (1) and a heat storage water tank (4), wherein the heat storage water tank (4) and the Stirling engine (1) are connected end to form a circulation loop;
the cooling tower (2) and the Stirling engine (1) are connected end to form a circulation loop, and the cooling tower (2) and the heat storage water tank (4) are arranged in parallel;
the heat exchange coil (41) is arranged in the heat storage water tank (4), and the heat exchange coil (41) is used for being connected with heating equipment end to form a heating circulation loop; and
an air-source heat pump (8), the air-source heat pump (8) being provided in the heating circulation circuit, and the air-source heat pump (8) being provided so as to be switchable in series and in parallel in the heating circulation circuit,
the Stirling engine (1) and/or the air source heat pump (8) provide heat for the heating device through circulating water.
2. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 1,
the circulation loop formed by the heat storage water tank (4) and the Stirling machine (1) and the circulation loop formed by the cooling tower (2) and the Stirling machine (1) are set to be capable of adjusting the on-off state according to the temperature of water participating in circulation.
3. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 2,
the heat storage water tank (4) is used for being connected to an opening of the Stirling engine (1) and is provided with a temperature sensor (T2), and the heat storage water tank (4) and the upstream of a water return connection point or the downstream of a water supply connection point of the cooling tower (2) are provided with the temperature sensor (T1).
4. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 1,
the photo-thermal and photo-electric co-production energy cascade heating system based on the Stirling engine comprises the heating equipment,
the heating equipment comprises a floor heater, the floor heater comprises a floor heating coil (9), and the floor heating coil (9) and the heat exchange coil (41) are connected end to form a circulation loop; and/or
The heating equipment comprises an air conditioner, the air conditioner comprises a fan coil (10), the fan coil (10) and the heat exchange coil (41) are connected end to form a circulation loop,
and under the condition that the heating equipment simultaneously comprises the floor heating coil (9) and the fan coil (10), the floor heating coil (9) and the fan coil (10) are connected in parallel.
5. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 4,
and a temperature sensor (T5) is arranged at the upstream connecting point of the floor heating coil (9) and/or the fan coil (10).
6. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 1,
a valve (V10) is arranged in the heating circulation loop, the air source heat pump (8) is connected in parallel with the valve (V10), and the air source heat pump (8) is switched between series connection and parallel connection in the heating circulation loop by controlling the on-off of the valve (V10).
7. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 1,
the heating circulation loop comprises a water supply pipeline (P7), a water return pipeline (P8) and a water mixing pipeline (P10), the heat exchange coil (41), the water supply pipeline (P7), the heating equipment and the water return pipeline (P8) are connected end to end, and the water mixing pipeline (P10) is connected to the water supply pipeline (P7) and the water return pipeline (P8), so that water in the water return pipeline (P8) can return to the water supply pipeline (P7) without passing through the heat exchange coil (41).
8. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 7,
the connection point of the water mixing pipeline (P10) and the water supply pipeline (P7) is provided with a water mixing center (5), and the water mixing center (5) is used for controlling the opening and closing degree of the water mixing pipeline (P10).
9. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 7,
the heating circulation circuit includes a separation line (P11), the separation line (P11) being connected to the water supply line (P7) and the water return line (P8) such that water in the water return line (P8) can be returned to the water supply line (P7) without passing through the heat exchange coil (41),
the water supply pipeline (P7) and the water return pipeline (P8) between the water mixing pipeline (P10) and the isolation pipeline (P11) can be controlled to be switched on and off.
10. A Stirling machine based photo-thermal-electricity-and-heat cogeneration energy cascade heating system according to claim 1,
an expansion tank (6) is arranged in the heating circulation loop, and the expansion tank (6) is used for maintaining the water pressure in the heating circulation loop.
CN202111367562.6A 2021-11-18 2021-11-18 Photo-thermal and photo-electric co-production energy cascade heating system based on Stirling engine Pending CN114060890A (en)

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