CN114877630A - Self-powered heat pump system applied to grain drying - Google Patents
Self-powered heat pump system applied to grain drying Download PDFInfo
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- CN114877630A CN114877630A CN202210368052.9A CN202210368052A CN114877630A CN 114877630 A CN114877630 A CN 114877630A CN 202210368052 A CN202210368052 A CN 202210368052A CN 114877630 A CN114877630 A CN 114877630A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
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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
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to the improvement of grain drying treatment technology, in particular to a self-powered heat pump system applied to grain drying, which optimizes the energy distribution proportion in different cold and hot modules, optimizes the special proportion of energy during self-powered operation, realizes the automatic start and stop of a unit under different load requirements, and realizes a system operation mode taking years as a cycle, and comprises a heat collector, a heat pump unit, a combined air conditioner and a drying bin, wherein the drying bin comprises a plurality of drying sections, a plurality of tempering sections and a cooling section; the heat collector is communicated with the upper part of the drying bin through a heat pump unit and a combined air conditioner, the heat collector is also communicated with the lower part of the drying bin through another heat pump unit and a combined air conditioner, the heat collector is respectively connected with the two heat pump units through a heat storage water tank, and an impurity and waste gas separation window is additionally arranged between each drying section and each cooling section; the energy source reformation and the high-efficiency energy source utilization of grain drying equipment are realized; the annual matching between the heat pump system and different grades of energy sources is realized; the energy-saving potential is large.
Description
Technical Field
The invention relates to improvement of grain drying treatment technology, in particular to a self-powered heat pump system applied to grain drying.
Background
China is a big agricultural country and a big country for grain production and consumption, grain safety problems are always related to national civilian life and social stability, and are the basis of coordinated development of economy and society in China. The grain drying in time can not only improve the benefit of the grain quality, but also effectively ensure the grain safety.
In the 80 s of the 20 th century, in the aspects of grain production and processing, China largely depends on a manual airing mode to dry grains, the method only can solve the problem of drying a small part of wet grains, the manual airing is time-consuming and labor-consuming, and meanwhile, the method is limited by conditions such as climate, airing fields and the like, so the original grain drying method has certain defects.
The dryer can improve the grain quality and increase the added value. The reasonable drying can keep the quality of the grains and is beneficial to prolonging the storage period of the grains. Various factors such as initial water content of grains, moisture content of drying gas, drying temperature, drying speed and the like in the grain drying process can influence the drying quality of the grains. Insufficient drying of the grain will result in moisture condensation or accelerated mold growth; the grains are broken due to excessive drying or uneven heat distribution of the grains, and the grain quality is seriously affected, so that the grain loss can account for more than 5 percent of the total grain yield because the moisture content is overhigh in the grain storage process every year in China.
The polished rice rate (HRY) can be used as an important index for the grain drying result, and compared with the primary drying, the two-stage or three-stage drying can improve the HRY. Compared with the method without tempering, the HRY can be improved by tempering in the drying process or after the drying process is finished. Therefore, in the grain drying process, a tempering process is generally added, and the tempering can reduce the influence of the drying on the HRY. Tempering conditions and drying conditions have a close relationship, and in order to achieve higher HRY, some scholars think that tempering practice for 40min is more effective when the drying temperature is 60 ℃.
Generally speaking, a dryer is most important to pay attention to a heating system, and only a good heating effect is achieved, so that the drying operation of the dryer can be enabled to play a stronger role, and for a grain dryer, only the heat supply efficiency of a unit needs to be discussed, and meanwhile, the device and the function in the aspect of refrigeration need to be paid attention to. The refrigerator is added in the dryer to cool the key parts of the dryer, so as to avoid the deformation or damage of parts caused by overhigh temperature, which is of great significance.
Disclosure of Invention
Aiming at the problems mentioned in the background technology, the invention aims to provide a self-powered heat pump system applied to grain drying, the energy distribution proportion in different cold and hot modules is optimized, the special proportion of the self-powered operation on energy is optimized, the automatic start and stop of a unit under different load requirements are realized, and the system operation mode taking the year as the cycle is realized.
The technical purpose of the invention is realized by the following technical scheme: a self-powered heat pump system applied to grain drying comprises a heat collector, a heat pump unit, a combined air conditioner and a drying bin, wherein the drying bin comprises a plurality of drying sections, a plurality of tempering sections and a cooling section; the heat collector is communicated with the upper part of the drying bin through the heat pump unit and the combined air conditioner, the heat collector is communicated with the lower part of the drying bin through the other heat pump unit and the combined air conditioner, the heat collector is respectively connected with the two heat pump units through the heat storage water tank, and an impurity and waste gas separation window is additionally arranged between each drying section and each cooling section.
Preferably, the heat collector can be a solar heat collector, and the design requirements of the heat collector are as follows:
in the formula, Q w -daily average hot water usage; rho w -water density; c w -water heat specific heat capacity; t is t end -t 0 -temperature difference of supply and return water; f-solar guarantee rate; j. the design is a square T The annual average daily radiant quantity of the lighting surface of the heat collector; eta cd -annual average heat collection efficiency of the collector based on total area; eta L -heat loss rate of the solar water heating system;
the heat exchanger can adopt a buried pipe type design, and the design requirements are as follows:
considering the vertical pipe burying mode, the pipe length and the spacing of the buried pipes can be determined by the following formulas:
by
Determining the length of a vertical shaft pipe burying pipe;
in the formula: l is the heat discharged to the soil in summer, and Q' is the total length of the vertical shaft buried pipe;
by
Determining the number and the spacing of the vertical shafts;
in the formula: n is the total number of the vertical shafts, L is the total length of the buried pipes of the vertical shafts, and H is the depth of the vertical shafts.
Preferably, the heat pump unit can adopt a water-water heat pump unit, and the system adopts
Q eh ＝25.555+0.5547T hpei -0.302T hpci 、
W comh ＝4.294-0.065T hpei +0.041T hpci 、
Q cc ＝31.298+0.298T hpei -0.187T hpci 、
W comc ＝3.569+0.006725T hpei +0.05T hpci 、
Fitting unit energy efficiency ratio, Q, under different operation modes eh Heat absorption capacity of evaporator in heating, W comh The power of the compressor during heating; q cc For the heat release of the condenser during cooling, W comc For compressor power, T, during refrigeration hpei The temperature of water inlet of evaporator of heat pump set, T hpci The temperature of the inlet water of the condenser of the heat pump unit.
Preferably, the combined air conditioner is provided with a heat regenerator and a humidistat, and is additionally provided with an impurity recovery part positioned at the periphery of the drying chamber, and an air source is additionally added.
Preferably, the heat pump unit comprises a heating module and a refrigerating module, and the specific condition analysis is as follows:
the heating module can be divided into the following four different operation modes aiming at grain drying according to the change of outdoor environment:
the first method is as follows: when the temperature of the solar heat storage water tank reaches above 50 ℃, only the solar heat supply mode is started, and a heat pump unit and an air source do not need to be started;
the second method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 50 ℃ but higher than 30 ℃, an electric heater in the heat storage water tank is started to perform appropriate heat supplement, and a heat pump unit and an air source are not started;
the third method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 30 ℃ but higher than 15 ℃, a heat pump unit is started to increase the temperature of hot water at the tail end and ensure sufficient heat source;
the method is as follows: when the temperature of the solar heat storage water tank is lower than 15 ℃, solar energy and geothermal energy are simultaneously used through the heat pump unit.
The refrigeration module, according to the change of outdoor environment, different energy collocation combination refrigeration can be divided into following three kinds of different operational modes:
the first method is as follows: when the external environment temperature is higher than 0 ℃ but lower than 15 ℃, the heat pump does not need to be additionally started for refrigeration;
the second method comprises the following steps: when the external environment temperature is higher than 15 ℃ but lower than 30 ℃, starting a heat pump unit, and refrigerating through a ground source heat pump;
the third method comprises the following steps: when the external environment temperature is higher than 30 ℃, the heat pump unit is started to be communicated with the heating module, part of heat is recycled in the heating module, and the other part of heat is discharged to underground soil through soil heat exchange.
In summary, the invention mainly has the following beneficial effects: the self-powered heat pump system applied to grain drying realizes energy source reformation and energy source efficient utilization of grain drying equipment.
The system takes the heat pump unit as a carrier, comprehensively utilizes solar energy, shallow geothermal energy and air energy all year round, provides stable cold and heat sources, has high overall performance and realizes high-efficiency utilization of energy.
The annual matching between the heat pump system and different grade energy sources is realized. The rationality that solar energy is used as high-grade energy to provide heat energy through a steam compression type heat pump unit is considered in the design of the system, meanwhile, shallow geothermal energy and air energy are used as auxiliary energy, and the function that the heat pump system is matched with three types of energy sources all year round can be achieved.
The energy-saving potential is large, self-energy supply is applied to coordinate heat distribution, the heat supply amount and the heat supply efficiency of the system are far larger than those of an electric drive mode of a pure air source heat pump, and the heat supply efficiency is improved by 40% compared with that of a traditional system.
The application scene is not limited, and the grain bin of this design is not restricted to one, connects a plurality of grain bins according to demand and place thereof in parallel, and the grain quantity of drying as required when using adjusts.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A self-powered heat pump system applied to grain drying comprises a heat collector, a heat pump unit, a combined air conditioner and a drying bin, wherein the drying bin comprises a plurality of drying sections, a plurality of tempering sections and a cooling section; the heat collector is communicated with the upper part of the drying bin through the heat pump unit and the combined air conditioner, the heat collector is communicated with the lower part of the drying bin through the other heat pump unit and the combined air conditioner, the heat collector is respectively connected with the two heat pump units through the heat storage water tank, and an impurity and waste gas separation window is additionally arranged between each drying section and each cooling section.
The heat collector can be a solar heat collector, and the design requirements are as follows:
in the formula, Q w -daily average hot water usage; rho w -water density; c w -water heat specific heat capacity; t is t end -t 0 -temperature difference of supply and return water; f-solar guarantee rate; j. the design is a square T The annual average daily radiant quantity of the lighting surface of the heat collector; eta cd -annual average heat collection efficiency of the collector based on total area; eta L -heat loss rate of the solar water heating system;
the heat exchanger can adopt a buried pipe type design, and the design requirements are as follows:
considering the vertical pipe burying mode, the pipe length and the spacing of the buried pipes can be determined by the following formulas:
by
Determining the length of a vertical shaft pipe burying pipe;
in the formula: l is the heat quantity discharged to the soil in summer, and Q' is the total length of the vertical shaft buried pipe;
by
Determining the number and the spacing of the vertical shafts;
in the formula: n is the total number of the vertical shafts, L is the total length of the buried pipes of the vertical shafts, and H is the depth of the vertical shafts.
The heat pump unit can adopt a water-water heat pump unit, and the system adopts
Q eh ＝25.555+0.5547T hpei -0.302T hpci 、
W comh ＝4.294-0.065T hpei +0.041T hpci 、
Q cc ＝31.298+0.298T hpei -0.187T hpci 、
W comc ＝3.569+0.006725T hpei +0.05T hpci 、
Fitting unit energy efficiency ratio, Q, under different operation modes eh Heat absorption capacity of evaporator in heating, W comh The power of the compressor during heating; q cc For the heat release of the condenser during cooling, W comc For compressor power, T, during refrigeration hpei The temperature of water inlet of evaporator of heat pump set, T hpci The temperature of the inlet water of the condenser of the heat pump unit.
The combined air conditioner is provided with a heat regenerator and a humidistat, and is additionally provided with an impurity recovery part positioned at the periphery of the drying bin, and an air source is additionally added.
The heat pump unit comprises a heating module and a refrigerating module, and the specific condition analysis is as follows:
the heating module can be divided into the following four different operation modes aiming at grain drying according to the change of outdoor environment:
the first method is as follows: when the temperature of the solar heat storage water tank reaches above 50 ℃, only the solar heat supply mode is started without starting a heat pump unit and an air source;
the second method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 50 ℃ but higher than 30 ℃, an electric heater in the heat storage water tank is started to perform appropriate heat supplement, and a heat pump unit and an air source are not started;
the third method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 30 ℃ but higher than 15 ℃, a heat pump unit is started to increase the temperature of hot water at the tail end and ensure sufficient heat source;
the method is as follows: when the temperature of the solar heat storage water tank is lower than 15 ℃, solar energy and geothermal energy are simultaneously used through the heat pump unit.
The refrigeration module, according to the change of outdoor environment, different energy collocation combination refrigeration can be divided into following three kinds of different operational modes:
the first method is as follows: when the external environment temperature is higher than 0 ℃ but lower than 15 ℃, the heat pump does not need to be additionally started for refrigeration;
the second method comprises the following steps: when the external environment temperature is higher than 15 ℃ but lower than 30 ℃, starting a heat pump unit, and refrigerating through a ground source heat pump;
the third method comprises the following steps: when the external environment temperature is higher than 30 ℃, the heat pump unit is started to be communicated with the heating module, part of heat is recycled in the heating module, and the other part of heat is discharged to underground soil through soil heat exchange.
The grain drying usually adopts a circulating drying or continuous drying method, wherein the continuous drying method adopted by the system is to continuously inject crops into the grain storage layer at the topmost layer from the top of the dryer, stir and continuously move downwards under the mechanical action, then the crops sequentially drop downwards from the first layer, and the whole grain drying process is completed after twice drying, twice tempering and once cooling.
The main heat source of the traditional heat pump grain drying is air or industrial tail gas, but the method is still electric in a driving mode at the end of the root, the heat pump can absorb heat from a low-temperature heat source, and can release available heat at a higher temperature, so that the method is a novel drying technology with obvious energy-saving effect and feasibility, under the call of energy conservation and emission reduction, the system adopts novel energy sources to replace the driving mode mainly using electric power, and the method utilizes the advantages of low price, simplicity and easiness in obtaining of solar energy to provide heat required for drying, and uses stable geothermal energy as the assistance when the solar energy is insufficient, and meanwhile, the effect of providing cold energy can be achieved by discharging the underground heat, the heat load required in winter is large, the cold load required in summer is large, the geothermal energy is used as the supply of heat and cold energy, and the temperature field imbalance caused by the cold and heat loads of the underground soil can be reduced. In consideration of the coordinated operation of the whole system, an air source heat pump is added as an auxiliary at the position of an air outlet of the combined air conditioner.
In the heat pump system, the temperature of the heated gas outlet is easy to control and regulate the circulating heat transfer medium and is completely isolated from the air used as the drying medium. Only the heat exchanger is used for exchanging heat, so that the grains are prevented from being polluted.
In the combined air conditioner designed by the system, a heat regenerator and a humidistat are also arranged, so that the temperature of air entering a drying chamber is properly reduced and adjusted in the grain drying process, a certain humidity is kept, and the grain drying quality can be ensured. The heat regenerator is used for reducing the temperature of hot air entering a drying chamber to a safe range, can also recycle redundant heat, improve the average temperature of media entering and exiting a condenser, further improve the heat exchange efficiency, keep the drying temperature of the system at about 50 ℃, simultaneously prevent the excessive high drying rate at the initial stage to cause thermal damage such as stress crack expansion on the surface of particles, and control the relative humidity of inlet hot air in the drying process within the range of 5-6%.
This system has still designed impurity waste gas separation and impurity collection to dry storehouse, installs impurity waste gas separation window additional in every dry section and cooling zone that dry storehouse corresponds, and specific porosity carries out effective separation with impurity and damp and hot air on the separation window, when keeping the grain drying effect, has reduced the speed of heat radiation loss in the drying tower, and vegetal impurity in the waste gas is held back in the separation window, changes open-air drying operation mode, and is friendly to the environment. Install impurity collection device additional in impurity waste gas separator bottom, collection device is fought by collecting and is collected the bag and constitute, and the impurity that is held back in impurity waste gas separator relies on gravity to subside the effect and is fought through the impurity collection of desiccator bottom and is gathered in totally closed impurity collection bag to realize the whole retrieves of impurity. The plant impurities generated by grain drying can be recovered to be used as biomass solid clean energy raw materials, and the processed and produced granular fuel can be used in the fields of industrial heat supply such as drying hot blast stove heat sources and heating in cities and towns.
The heat pump system applied to grain drying provides basic requirements for grain drying through cold and heat loads of solar energy, geothermal energy and air energy, and performance and stability of the system are enhanced to a certain extent through the design of a heat regenerator and a humidistat in a combined air conditioner, and the environmental protection performance of the system is greatly improved due to the additional added impurity recovery system.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a but be applied to grain drying from energy supply heat pump system which characterized in that: the drying bin comprises a plurality of drying sections, a plurality of tempering sections and a cooling section; the heat collector is communicated with the upper part of the drying bin through the heat pump unit and the combined air conditioner, the heat collector is communicated with the lower part of the drying bin through the other heat pump unit and the combined air conditioner, the heat collector is respectively connected with the two heat pump units through the heat storage water tank, and an impurity and waste gas separation window is additionally arranged between each drying section and each cooling section.
2. The self-energizable heat pump system for grain drying of claim 1, wherein: the heat collector can be a solar heat collector, and the design requirements are as follows:
in the formula, Q w -daily average hot water usage; rho w -water density; c w -water heat specific heat capacity; t is t end -t 0 -temperature difference of supply and return water; f-)-solar energy assurance rate; j. the design is a square T The annual average daily radiant quantity of the lighting surface of the heat collector; eta cd -annual average heat collection efficiency of the collector based on total area; eta L -heat loss rate of the solar water heating system;
the heat exchanger can adopt a buried pipe type design, and the design requirements are as follows:
considering the vertical pipe burying mode, the pipe length and the spacing of the buried pipes can be determined by the following formulas:
by
Determining the length of a vertical shaft pipe burying pipe;
in the formula: l is the heat quantity discharged to the soil in summer, and Q' is the total length of the vertical shaft buried pipe;
by
Determining the number and the spacing of the vertical shafts;
in the formula: n is the total number of the vertical shafts, L is the total length of the buried pipes of the vertical shafts, and H is the depth of the vertical shafts.
3. The self-energizable heat pump system for grain drying of claim 1, wherein: the heat pump unit can adopt a water-water heat pump unit, and the system adopts
Q eh ＝25.555+0.5547T hpei -0.302T hpci 、
W comh ＝4.294-0.065T hpei +0.041T hpci 、
Q cc ＝31.298+0.298T hpei -0.187T hpci 、
W comc ＝3.569+0.006725T hpei +0.05T hpci 、
Fitting unit energy efficiency ratio, Q, under different operation modes eh Heat absorption capacity of evaporator in heating, W comh The power of the compressor during heating; q cc For the heat release of the condenser during cooling, W comc For compressor power, T, during refrigeration hpei The temperature of water inlet of evaporator of heat pump set, T hpci The temperature of the inlet water of the condenser of the heat pump unit.
4. The self-energizable heat pump system for grain drying of claim 1, wherein: the combined air conditioner is provided with a heat regenerator and a humidistat, and is additionally provided with an impurity recovery part positioned at the periphery of the drying bin, and an air source is additionally added.
5. The self-energizable heat pump system for grain drying of claim 1, wherein: the heat pump unit comprises a heating module and a refrigerating module, and the specific condition analysis is as follows:
the heating module can be divided into the following four different operation modes aiming at grain drying according to the change of outdoor environment:
the first method is as follows: when the temperature of the solar heat storage water tank reaches above 50 ℃, only the solar heat supply mode is started, and a heat pump unit and an air source do not need to be started;
the second method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 50 ℃ but higher than 30 ℃, an electric heater in the heat storage water tank is started to perform appropriate heat supplement, and a heat pump unit and an air source are not started;
the third method comprises the following steps: when the temperature of the solar heat storage water tank is lower than 30 ℃ but higher than 15 ℃, a heat pump unit is started to increase the temperature of hot water at the tail end and ensure sufficient heat source;
the method is as follows: when the temperature of the solar heat storage water tank is lower than 15 ℃, solar energy and geothermal energy are simultaneously used through the heat pump unit.
The refrigeration module, according to the change of outdoor environment, different energy collocation combination refrigeration can be divided into following three kinds of different operational modes:
the first method is as follows: when the external environment temperature is higher than 0 ℃ but lower than 15 ℃, the heat pump does not need to be additionally started for refrigeration;
the second method comprises the following steps: when the external environment temperature is higher than 15 ℃ but lower than 30 ℃, starting a heat pump unit, and refrigerating through a ground source heat pump;
the third method comprises the following steps: when the external environment temperature is higher than 30 ℃, the heat pump unit is started to be communicated with the heating module, part of heat is recycled in the heating module, and the other part of heat is discharged to underground soil through soil heat exchange.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201919594U (en) * | 2011-01-14 | 2011-08-10 | 天津科技大学 | Multistage direct-flow tempering heat pump drying device |
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| US20130212901A1 (en) * | 2012-02-20 | 2013-08-22 | Emerson Electric Co. | Apparatus and Methods for Drying Material |
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| CN112487527A (en) * | 2020-11-25 | 2021-03-12 | 浙江工业大学 | Design method of solar ground source heat pump heat supply and air conditioning system |
| CN214665639U (en) * | 2020-09-21 | 2021-11-09 | 浙江正泰聚能科技有限公司 | Drying system |
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| CN201919594U (en) * | 2011-01-14 | 2011-08-10 | 天津科技大学 | Multistage direct-flow tempering heat pump drying device |
| CN102445007A (en) * | 2011-12-06 | 2012-05-09 | 上海电力学院 | Hot water system based on solar energy and building integration |
| US20130212901A1 (en) * | 2012-02-20 | 2013-08-22 | Emerson Electric Co. | Apparatus and Methods for Drying Material |
| CN203687442U (en) * | 2013-12-10 | 2014-07-02 | 上海宝路能源科技有限公司 | Multi-source combined heat supply system |
| CN105841472A (en) * | 2016-05-20 | 2016-08-10 | 李洪毅 | Grain variable-temperature vacuum drying equipment and method |
| CN207285034U (en) * | 2017-06-13 | 2018-05-01 | 郑素林 | A kind of energy saving and environment friendly grain drying machine |
| CN214665639U (en) * | 2020-09-21 | 2021-11-09 | 浙江正泰聚能科技有限公司 | Drying system |
| CN112487527A (en) * | 2020-11-25 | 2021-03-12 | 浙江工业大学 | Design method of solar ground source heat pump heat supply and air conditioning system |
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