CN116929036A - Photovoltaic drive solar heat pump dryer - Google Patents
Photovoltaic drive solar heat pump dryer Download PDFInfo
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- CN116929036A CN116929036A CN202310799383.2A CN202310799383A CN116929036A CN 116929036 A CN116929036 A CN 116929036A CN 202310799383 A CN202310799383 A CN 202310799383A CN 116929036 A CN116929036 A CN 116929036A
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- 238000001035 drying Methods 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 8
- 239000002918 waste heat Substances 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 239000003570 air Substances 0.000 claims description 139
- 230000033228 biological regulation Effects 0.000 claims description 11
- 230000017525 heat dissipation Effects 0.000 claims description 9
- 239000012080 ambient air Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 claims 1
- 231100000252 nontoxic Toxicity 0.000 claims 1
- 230000003000 nontoxic effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 5
- 238000009833 condensation Methods 0.000 abstract 1
- 230000005494 condensation Effects 0.000 abstract 1
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/007—Heating arrangements using waste heat recovered from the dried product
- F26B23/008—Heating arrangements using waste heat recovered from the dried product using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
- Y02A40/963—Off-grid food refrigeration
- Y02A40/966—Powered by renewable energy sources
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a photovoltaic-driven solar heat pump dryer which comprises a drying part, a heat pump part and a solar photovoltaic part, wherein direct current generated by solar photovoltaic is utilized to drive a direct current speed-adjustable heat pump to heat air, and then the hot dry air is used for drying fruits, medicinal materials and other articles. The invention adopts a drying mode with closed circulation heating and heating as main and open circulation heating and heating as auxiliary, and a plate-fin type air-conditioner regenerator is arranged at the outlet of the drying chamber, thereby utilizing waste heat of exhaust gas and recycling condensed water in dried articles. The invention can change the heating capacity, evaporation temperature and condensation temperature of the heat pump cycle by adjusting the rotating speed of the direct current speed-regulating compressor and the opening of the electronic expansion valve, thereby controlling the temperature and humidity of the dry air. The photovoltaic direct-driven solar heat pump dryer can be used for obtaining sanitary and high-drying-quality products and liquid water efficiently according to different external environments, different drying temperatures of articles and different final water content requirements.
Description
Technical Field
The invention relates to a photovoltaic drive solar heat pump dryer, in particular to a heat pump drying system driven by a solar photovoltaic direct-current power supply and capable of controlling the temperature and the humidity of drying air.
Background
The heat pump has remarkable drying energy-saving effect and mild drying process. Compared with the traditional electric heating drying, the efficiency of the heat pump is more than 1, so that 3-4kW of heat can be obtained per 1kW of electric quantity consumed, and the energy-saving effect is obvious. Compared with the traditional airing and drying, the hot air provided by the heat pump is clean, stable and mild, the traditional airing and drying is mainly affected by the environment, and the drying quality, the drying effect and the drying speed can not be guaranteed, so that the heat pump drying technology has great superiority. Compared with the traditional combustion fuel drying, the traditional combustion fuel drying mode can burn a large amount of stone energy, so that the environment is polluted, even a certain pollution is generated to dried objects, and the heat pump only consumes electric energy to heat air, so that the drying process is very environment-friendly, and the drying quality and the drying effect can be ensured.
Disclosure of Invention
The photovoltaic-driven solar heat pump dryer can be used for drying articles and condensing water evaporated from the articles at the evaporator, and a large amount of water generated by the photovoltaic-driven solar heat pump dryer can be used as domestic water and even drinking water, so that the photovoltaic-driven solar heat pump dryer is very valuable for arid areas. In summary, the heat pump drying system is a necessary trend of development in the energy-saving and environment-friendly direction in the drying field.
The existing solar photovoltaic heat pump systems all adopt inverter devices, namely, direct current output by a solar photovoltaic cell is boosted and inverted into alternating current, and then the alternating current is used for driving an alternating current compressor, so that the process not only increases the construction cost and the maintenance cost, but also reduces the utilization efficiency of photovoltaic power generation. The invention introduces the plate-fin type air-conditioner heat-return device, and can recycle the sensible heat in the exhaust gas, so that the drying capacity of the photovoltaic-driven solar heat pump dryer is increased under the same power consumption of the compressor. Meanwhile, the invention also introduces the plate-fin type air-air heat exchanger to dissipate the surplus heat of the air in the closed circulation to the environment so as to maintain the whole energy balance, and the photovoltaic-driven solar heat pump dryer can stably operate for a long time.
The invention aims to provide a photovoltaic-driven solar heat pump dryer, which is used for drying articles by driving a heat pump compressor to provide hot air by a solar photovoltaic direct-current power supply.
The aim of the invention is achieved by the following technical scheme. The photovoltaic-driven solar heat pump dryer of the present invention comprises: a solar photovoltaic section comprising a solar cell assembly, a power and voltage regulator, and a control module; the heat pump part comprises a direct-current speed regulation compressor, an evaporator, a condenser, an electronic expansion valve and corresponding pipelines; the drying part comprises a drying box, a plate-fin type air-air heat exchanger, a plate-fin type air-air heat return device, a pipeline fan, a variable air channel valve and a detachable air pipeline.
In one embodiment, solar light irradiates the solar cell module to generate electricity, the generated electricity enters a power and voltage regulator to be regulated through a circuit, and direct current subjected to voltage regulation enters a control module to drive and control a direct current speed regulation compressor, an electronic expansion valve, a variable-air-channel valve and a fan. The air pipeline and the drying box are tightly wrapped by the heat insulation material, and the air pipeline in the drying part is detachable, so that the maintenance and the cleaning are convenient. An air pipeline is used for connecting an outlet of the drying box with a hot side inlet of the plate-fin type air-to-air regenerator, and a pipeline fan is arranged in the pipeline; connecting a hot side outlet of the plate-fin type air-to-air heat exchanger and a hot side inlet of the plate-fin type air-to-air heat exchanger by an air pipeline; connecting a hot side outlet of a fin type air-air heat exchanger with an inlet of a heat pump evaporator by an air pipeline; a variable air duct valve is arranged at the outlet of the evaporator and the cold side inlet of the plate-fin type air-space regenerator; connecting a fin type air-to-air heat recovery device cold side outlet and a heat pump condenser inlet by an air pipeline; an air pipe is used for connecting the outlet of the condenser with the inlet of the drying box. And a heat radiation fan is arranged at the cold side inlet of the plate-fin air-air heat exchanger, and is started when the variable air passage valve is closed. The bottom of the evaporator is provided with a condensed water outlet, so that condensed water is conveniently discharged and collected. The hot side of the plate-fin type air-air heat exchanger flows through the air flowing out of the hot side of the plate-fin type air-air heat exchanger, the cold side of the plate-fin type air-air heat exchanger flows through the ambient air, and the plate-fin type air-air heat exchanger dissipates a part of heat of the circulating air into the ambient air so as to maintain energy balance of the closed drying cycle. The hot side of the plate-fin type air-air regenerator flows through the air flowing out of the drying box, and the cold side of the plate-fin type air-air regenerator flows through the air flowing out of the evaporator. The plate-fin type air-to-air regenerator transmits part of waste heat of exhaust gas to air to be fed into the condenser, fully utilizes the waste heat, reduces sensible heat load of the evaporator and improves drying capacity. The variable air duct valve is controlled by the control module. When the variable air duct valve is opened, the outlet of the evaporator and the cold side inlet of the plate-fin type air-to-air heat regenerator are respectively communicated with the external environment, and the photovoltaic-driven solar heat pump dryer is in open circulation; when the variable air duct valve is closed, the outlet of the evaporator is communicated with the cold side inlet of the plate-fin type air-to-air heat regenerator, and the photovoltaic-driven solar heat pump dryer is in closed circulation. When the closed drying cycle is initially operated, the variable air duct valve is opened for a period of time to supplement circulating air, and then is closed. When the ambient temperature is higher and the humidity is lower, the variable air duct valve is opened, so that the photovoltaic-driven solar heat pump dryer operates in an open circulation state. The rotating speed of the direct-current speed-regulating compressor and the opening degree of the electronic expansion valve can be regulated according to different external environments and drying requirements through the control module, so that the evaporating pressure, the condensing pressure, the evaporating temperature, the condensing temperature and the refrigerant flow of the refrigerant circulation can be regulated. The air inlet of the condenser is provided with a first temperature and humidity sensor, the inlet of the drying box is provided with a second temperature and humidity sensor, the outlet of the drying box is provided with a third temperature and humidity sensor, and all the temperature sensors are connected with the control module. Each temperature and humidity sensor senses the temperature and humidity of each place and transmits the data to the control module, and the control module analyzes the data and then controls the heat pump part.
According to one aspect of the present invention, there is provided a photovoltaic-driven solar heat pump dryer, characterized by comprising:
a solar photovoltaic section comprising a solar cell assembly, a power and voltage regulator, and a control module;
the heat pump part comprises a direct current speed regulation compressor, an evaporator, an electronic expansion valve and a condenser;
the drying part comprises a drying box, a pipeline fan, a plate-fin type air-air heat exchanger, a first temperature and humidity sensor, a second temperature and humidity sensor, a third temperature and humidity sensor, a heat dissipation fan, a plate-fin type air-air heat regenerator and a variable air channel valve.
The beneficial effects of the invention are mainly as follows:
the invention relates to a photovoltaic drive solar heat pump dryer, which is a heat pump drying system driven and controlled by a solar photovoltaic direct current power supply. The solar photovoltaic direct-current power supply driving control technology is adopted, so that the photovoltaic driving solar heat pump dryer not only improves the heat generation capacity of unit power, but also can effectively adjust the working state of the heat pump when driven by solar photovoltaic through controlling the rotation speed of the compressor and the opening of the expansion valve, thereby controlling the state of drying air and controlling the whole drying process. The plate-fin type air-to-air heat exchanger and the plate-fin type air-to-air heat return device are added into the photovoltaic driving solar heat pump dryer, so that waste heat utilization is improved, energy consumption of the photovoltaic driving solar heat pump dryer is reduced, and the problem of energy balance under closed drying is solved, so that the closed mode can stably run for a long time. The invention can also collect condensate water of the dry matter efficiently, and has great practical significance for the dry area. The photovoltaic-driven solar heat pump dryer provided by the invention has the advantages of energy conservation, high drying efficiency, good drying quality, small influence on environment, convenience in control, safety, reliability and simplicity in operation.
Drawings
Fig. 1 is a schematic diagram of a photovoltaic driven solar heat pump dryer according to one embodiment of the present invention.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1, a photovoltaic-driven solar heat pump dryer according to an embodiment of the present invention includes: a solar photovoltaic part, a heat pump part and a drying part. In the embodiment shown in fig. 1, the solar module (1), the power and voltage regulator (2) and the control module (3) are connected in sequence by insulated wires in the solar photovoltaic section. The control module (3) is respectively connected with a direct current speed regulation compressor (4) in the heat pump part, an electronic expansion valve (6), a pipeline fan (9), a heat dissipation fan (14), a first temperature and humidity sensor (11), a second temperature and humidity sensor (12), a third temperature and humidity sensor (13) and a variable air duct valve (16) in the drying part by wires. The solar cell module (1) provides electric energy for a power and voltage regulator (2), a control module (3) in a solar photovoltaic part, a direct current speed regulation compressor (4), an electronic expansion valve (6), the direct current speed regulation compressor (4), the electronic expansion valve (6) and a pipeline fan (9), a heat dissipation fan (14) and a variable air channel valve (16) in a drying part C in a heat pump part B. Meanwhile, the control module (3) collects temperature and humidity signals from the first temperature and humidity sensor (11), the second temperature and humidity sensor (12) and the third temperature and humidity sensor (13) and converts the temperature and humidity signals into control signals, and controls the rotating speed of the direct-current speed-regulating compressor (4), the opening degree of the electronic expansion valve (6), the rotating speed of the pipeline fan (9), the rotating speed of the heat dissipation fan (14) and the opening and closing of the variable-air-passage valve (16). The direct-current speed-regulating compressor (4), the evaporator (5), the expansion valve (6) and the condenser (7) are sequentially connected through pipelines in the heat pump part to form a heat pump loop, and the heat pump loop is filled with refrigerant. The drying air in the drying part is coupled with the heat pump part in a closed or open mode through an air pipeline and a variable air passage valve.
As shown in fig. 1, in one embodiment according to the present invention, a drying mode is used in which closed-type heat recovery is dominant and open-type heat recovery is auxiliary. The heat pump part comprises a drying box (8), a pipeline fan (9), a plate-fin type air-air heat exchanger (10), a first temperature and humidity sensor (11), a second temperature and humidity sensor (12), a third temperature and humidity sensor (13), a heat radiation fan (14), a plate-fin type air-air heat regenerator (15) and a variable air channel valve (16). An air pipeline is used for connecting an outlet of the drying box (8) with a hot side inlet of the plate-fin type air-air regenerator (15), and a pipeline fan (9) is arranged in the air pipeline; an air pipeline is used for connecting a hot side outlet of the fin type air-air heat regenerator (15) and a hot side inlet of the fin type air-air heat exchanger (10); connecting a hot side outlet of a fin type air-air heat exchanger (10) and an inlet of a heat pump evaporator (5) by an air pipeline; a variable air duct valve (16) is arranged at the outlet of the evaporator (5) and the inlet of the cold side of the plate-fin type air-space heat regenerator (15); an air pipeline is used for connecting a cold side outlet of the fin type air-air regenerator (15) with an inlet of the heat pump condenser (7); an air pipeline is used for connecting the outlet of the condenser (7) with the inlet of the drying box (8). And a heat radiation fan (14) is arranged at the cold side inlet of the plate-fin air-air heat exchanger (10). The evaporator (5) is provided with a condensed water outlet, and each connecting port is sealed and wrapped with a heat insulation material.
When the photovoltaic-driven solar heat pump dryer operates, air in circulation enters the cold side of the condenser (7) to absorb heat of a refrigerant at the hot side of the condenser (7), so that the temperature is increased, and the relative humidity is reduced. The air with high temperature and low relative humidity enters a drying box (8) to transfer heat and mass with the materials, and takes away the water vapor evaporated from the materials. At this time, the air from the drying box (8) is changed into high-temperature and high-humidity air, the air enters the hot side of the plate-fin type air-air heat-returning device (15) after the kinetic energy is improved by the pipeline fan (9), the heat is transferred to the air passing through the cold side of the plate-fin type air-air heat-exchanging device (15), then the heat is transferred to the ambient air passing through the hot side of the plate-fin type air-air heat-exchanging device (10), the ambient air enters the hot side of the evaporator (5) after being cooled by sensible heat twice, exchanges heat with the low-temperature refrigerant at the cold side of the evaporator (5), sensible heat and latent heat exchange occur, condensate water can be generated at the hot side of the evaporator (5), and the condensate water is discharged from a water outlet at the lower part of the evaporator (5). When in closed circulation, the variable air duct valve (16) is closed, air at the outlet of the hot side of the evaporator (5) enters the cold side of the plate-fin type air-air heat regenerator (15) to exchange heat with air at the hot side of the plate-fin type air-air heat regenerator (15), the temperature is increased, and then the air enters the cold side of the condenser (7) to complete closed circulation. At the moment, all the vapor evaporated by the materials is condensed and discharged by the evaporator (5). A heat radiation fan (14) is arranged at the cold side inlet of the plate-fin air-air heat exchanger (10) to radiate hot side circulating air into the environment so as to maintain energy balance, and the closed drying cycle can work normally. When the ambient air temperature is higher and the humidity is lower or the photovoltaic-driven solar heat pump dryer is in a closed drying starting period, the variable air duct valve (16) is opened, and the drying cycle is changed into an open cycle. The problem of energy imbalance does not exist in the open cycle process, and the cooling fan (14) is turned off at the moment. Simultaneously, the outside fresh air enters from the cold side of the plate-fin type air-space heat regenerator (15), the exhaust gas is discharged from the hot side outlet of the evaporator (5), and the rest flow is the same as the closed circulation. For open circulation and closed circulation, the introduction of the plate-fin type air-to-air regenerator can recycle a part of heat in exhaust gas, more liquid water can be condensed under the condition of not changing evaporation load, and the drying efficiency of the whole photovoltaic-driven solar heat pump dryer is improved.
According to the photovoltaic driving solar heat pump dryer, the photovoltaic module provides electric energy for the whole photovoltaic driving solar heat pump dryer, and meanwhile, the sensor and the control module collect signals and convert the signals into control signals, so that the heat pump part and the drying part can dry a dried object in an energy-saving, efficient and controllable manner. The closed type backheating drying mode is not in direct contact with the external environment, and the waste heat of exhaust gas is recovered, so that the closed type backheating drying mode is suitable for various conditions requiring clean drying, high external environment humidity and low external environment temperature; the open type backheating drying mode recovers waste heat of exhaust gas, and is suitable for the conditions of clean external environment, high temperature and low humidity.
The foregoing is merely a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the invention.
Claims (6)
1. A photovoltaic-driven solar heat pump dryer, characterized by comprising:
a solar photovoltaic section comprising a solar module (1), a power and voltage regulator (2) and a control module (3);
the heat pump part comprises a direct-current speed regulation compressor (4), an evaporator (5), an electronic expansion valve (6) and a condenser (7);
the drying part comprises a drying box (8), a pipeline fan (9), a plate-fin type air-air heat exchanger (10), a first temperature and humidity sensor (11), a second temperature and humidity sensor (12), a third temperature and humidity sensor (13), a heat dissipation fan (14), a plate-fin type air-air heat regenerator (15) and a variable air channel valve (16),
a plate-fin type air-air heat exchanger (10) and a plate-fin type air-air heat regenerator (15),
wherein:
a first temperature and humidity sensor (11) is arranged at the inlet of the air inlet condenser,
a second temperature and humidity sensor (12) is arranged at the inlet of the drying box,
a third temperature and humidity sensor (13) is arranged at the outlet of the drying box,
the first temperature and humidity sensor, the second temperature and humidity sensor and the third temperature and humidity sensor are all connected with the control module (3).
The outlet of the drying box (8) is connected with the hot side inlet of the plate-fin type air-air heat regenerator (15) through an air pipeline, a pipeline fan (9) is arranged in the pipeline,
through the hot side outlet of the air pipeline connecting plate fin type air-air heat regenerator (15) and the hot side inlet of the plate fin type air-air heat exchanger (10),
through the hot side outlet of the air pipeline connecting plate fin type air-air heat exchanger (10) and the inlet of the heat pump evaporator (5),
a variable air passage valve (16) is arranged between the outlet of the evaporator (5) and the cold side inlet of the plate-fin type air-space heat regenerator (15),
through the air pipeline connecting plate fin type air-air heat regenerator (15) cold side outlet and the heat pump condenser (7) inlet,
the outlet of the condenser (7) is connected with the inlet of the drying box (8) through an air pipeline,
a heat radiation fan (14) is arranged at the inlet of the cold side of the plate-fin air-air heat exchanger (10),
the hot side of the plate-fin type air-air heat exchanger (10) flows through the air flowing out of the hot side of the plate-fin type air-air heat regenerator (15),
the cold side of the plate-fin air-air heat exchanger (10) flows through ambient air,
the plate-fin type air-air heat exchanger (10) dissipates a part of heat of the circulating air into the ambient air to maintain the energy balance of the closed drying cycle,
the hot side of the plate-fin type air-air regenerator (15) flows through the air flowing out of the drying box (8),
the cold side of the plate-fin type air-air regenerator (15) flows through the air flowing out of the evaporator (5),
the plate-fin type air-conditioning regenerator (15) recovers and utilizes waste heat of exhaust gas,
the solar cell module (1) provides electric energy for a power and voltage regulator (2), a control module (3), a direct current speed regulation compressor (4), an electronic expansion valve (6), a pipeline fan (9), a heat dissipation fan (14) and a variable air passage valve (16).
2. The photovoltaic-driven solar heat pump dryer of claim 1 wherein,
the detachable air pipeline and the drying box (8) are both wrapped by nontoxic heat insulation materials, and a condensed water outlet is arranged at the lower part of the evaporator (5) so that condensed water can be collected.
3. The photovoltaic-driven solar heat pump dryer of claim 1 wherein,
the solar cell module (1) is sequentially connected with the power and voltage regulator (2) and the control module (3) through insulated wires;
the output ends of the control module (3) are respectively connected to the direct-current speed regulation compressor (4), the electronic expansion valve (6), the pipeline fan (9), the heat dissipation fan (14) and the variable air passage valve (16) through insulated wires.
4. The photovoltaic-driven solar heat pump dryer of claim 1, wherein:
the variable air passage valve (16) is controlled by the control module (3), so that:
when the variable air duct valve (16) is opened, the outlet of the evaporator (5) and the cold side inlet of the plate-fin type air-to-air heat regenerator (15) are respectively communicated with the external environment, the heat dissipation fan (14) is closed, the photovoltaic-driven solar heat pump dryer is in open circulation,
when the variable air passage valve (16) is closed, the outlet of the evaporator (5) is communicated with the inlet of the cold side of the plate-fin type air-to-air heat regenerator (15), the heat radiation fan (14) is opened, the photovoltaic driving solar heat pump dryer is in closed circulation,
when the closed drying cycle is operated initially, the variable air passage valve (16) is opened for a period of time to supplement the circulating air, and then closed,
when the ambient temperature is higher and the humidity is lower, the variable air duct valve (16) is opened, so that the photovoltaic-driven solar heat pump dryer operates in an open circulation state.
5. The photovoltaic-driven solar heat pump dryer of claim 1 wherein,
the rotating speed of the direct current speed regulation compressor (4) and the opening degree of the electronic expansion valve (6) can be regulated according to different external environments and the requirements of regulating and drying through the control module, so that the evaporating pressure, the condensing pressure, the evaporating temperature, the condensing temperature and the refrigerant flow of the refrigerant circulation can be regulated.
6. A photovoltaic driven solar heat pump drying method based on a photovoltaic driven solar heat pump dryer according to claim 1, characterized in that:
by controlling the variable airway valve (16) with the control module (3), thereby:
when the variable air duct valve (16) is opened, the outlet of the evaporator (5) and the cold side inlet of the plate-fin type air-to-air heat regenerator (15) are respectively communicated with the external environment, the heat dissipation fan (14) is closed, the photovoltaic-driven solar heat pump dryer is in open circulation,
when the variable air passage valve (16) is closed, the outlet of the evaporator (5) is communicated with the inlet of the cold side of the plate-fin type air-to-air heat regenerator (15), the heat radiation fan (14) is opened, the photovoltaic driving solar heat pump dryer is in closed circulation,
when the closed drying cycle is operated initially, the variable air passage valve (16) is opened for a period of time to supplement the circulating air, and then closed,
when the ambient temperature is higher and the humidity is lower, the variable air duct valve (16) is opened, so that the photovoltaic-driven solar heat pump dryer operates in an open circulation state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN201811005722.0A CN110873517A (en) | 2018-08-30 | 2018-08-30 | Photovoltaic drive solar heat pump dryer |
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| EP4121707B1 (en) * | 2020-03-20 | 2024-03-13 | Samster Ab | Method and system for supplying drying air |
| CN113124648A (en) * | 2021-04-12 | 2021-07-16 | 北京航空航天大学 | Drying system and method |
| CN113245052A (en) * | 2021-05-31 | 2021-08-13 | 伯特利(山东)工业设备有限公司 | Closed air system and method for dry separation of coal |
| FI20225544A1 (en) * | 2022-06-17 | 2023-12-18 | Spinnova Oyj | Method for recovering thermal energy in a material drying process, heat recovery system, and arrangement for drying material |
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| CN101769675A (en) * | 2009-01-07 | 2010-07-07 | 广东省农业机械研究所 | Paddy dryer with heat return type heat pump |
| KR20120055260A (en) * | 2010-11-23 | 2012-05-31 | 모아기연 주식회사 | Drier assembly |
| CN102767937B (en) * | 2011-05-04 | 2015-04-15 | 中国科学院理化技术研究所 | Greenhouse-type solar heat pump combination drying device and method thereof |
| CN103644724B (en) * | 2013-12-04 | 2015-04-01 | 烟台大学 | Novel heat pump drying device |
| CN105021021A (en) * | 2015-07-31 | 2015-11-04 | 苏州宏展信息科技有限公司 | Solar drying room real-time monitoring and control system with power supply optimizing function |
| CN107152856B (en) * | 2017-07-05 | 2019-05-17 | 哈尔滨工业大学 | A kind of heat pump sludge drier of evaporator pre-cooling |
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