Airing room drying system with solar energy coupled with air energy

Abstract

The utility model discloses an air-curing barn drying system with solar energy coupled with air energy. The air-curing barn drying system comprises a solar heat collector, an air source heat pump, a heat storage water tank, a drying chamber, a control center, a connecting valve and a dryer. A first water outlet of the heat storage water tank communicates with the solar heat collector, a second water outlet communicates with the air source heat pump, and a third water outlet communicates with the dryer. The first water inlet communicates with a water outlet of the solar heat collector, the second water inlet communicates with a water outlet of the air source heat pump, the third water inlet communicates with a water outlet of the dryer, and the fourth water inlet communicates with an external water source. A solar circulating pump is arranged on a passage for communicating the first water outlet with a water inlet of the solar heat collector; a hot water supply pump is arranged on a passage for communicating the third water outlet with a water supply inlet of the dryer; the control center is electrically communicated with the solar heat collector, the air source heat pump, the control valve, the solar circulating pump and the heat supply water pump. The melon and fruit drying device solves the problems that a traditional melon and fruit drying method is high in drying energy consumption, long in drying time, large in pollution and uncontrollable.

Description

TECHNICAL FIELD

[0001] The utility model relates to drying system technical field, specifically belong to a kind of solar coupling air drying system of airing room. BACKGROUND

[0002] With the development of modern agriculture in China, the yield of crops is also increasing, and the demand for drying melons and fruits is increasing, and the requirements for drying equipment are also increasing. Xinjiang is rich in melons and fruits, and has high nutritional value, which is loved by more and more people, and the demand for dried fruits is also increasing. The quality of dried fruits and the cost required during the drying process have a great impact. The conventional drying method mainly uses natural drying and hot drying. Natural drying is usually done after the crops are mature, and they are hung on the tree for drying, or hung in a special drying room. However, this drying method requires a long drying period, and during the drying process, some crops cannot be dried in time and will rot, which not only breeds bacteria, but also is not good for the health of consumers. At the same time, the crops are hung on the branches for drying, which will attract birds to eat, which will also waste some crops. Traditional hot drying uses coal for heating, but as people realize that coal is a non-renewable energy source and its burning pollutes the environment, this method has been gradually abandoned. Then, with the advent of natural gas as a substitute for coal, natural gas is gradually used for drying in the market. Although it has high combustion efficiency and produces a lot of heat, it produces a large amount of toxic gas during combustion, and its service life is short, so it is abandoned. Most of the drying methods are changed to electric heating, but electric heating cannot better control the required heat, which often results in the waste of some generated heat. Therefore, the shortcomings of these methods are obvious. The traditional drying method has high energy consumption and long time, and is not sanitary and does not meet the standards. The use of coal and natural gas also causes great pollution. The use of electricity cannot be intelligently controlled, and some energy cannot be completely utilized during use. At the same time, electric heating has a certain risk of electric leakage, and the service life is short.

[0003] In view of the above, it is necessary to develop a more continuous, efficient, energy-saving and controllable drying system to provide a more economical and convenient drying process for farmers. UTILITY MODEL CONTENT

[0004] The utility model provides a novel airing room drying system coupled with solar energy and air energy, which solves the problems of high energy consumption, long time, large pollution and uncontrollability of the traditional melon and fruit drying method.

[0005] In order to solve the above technical problems, the utility model provides a kind of drying system of airing room with solar energy coupling air energy, comprising: solar collector, air source heat pump, heat storage water tank, drying chamber, control center, connecting valve and with the drying chamber communication dryer;

[0006] The heat storage water tank includes first water outlet, second water outlet, third water outlet, first water inlet, second water inlet, third water inlet and fourth water inlet, the first water outlet is communicated with the water inlet of the solar collector by valve, the second water outlet is communicated with the water inlet of the air source heat pump, and the third water outlet is communicated with the water inlet of the dryer;

[0007] The first water inlet is communicated with the water outlet of the solar collector, the second water inlet is communicated with the water outlet of the air source heat pump, the third water inlet is communicated with the water outlet of the dryer, and the fourth water inlet is communicated with external water source;

[0008] The above each communication passage is provided with control valve, the passage that the first water outlet is communicated with the water inlet of the solar collector is provided with solar circulation pump, and the passage that the third water outlet is communicated with the water inlet of the dryer is provided with hot water supply pump;

[0009] The control center is electrically communicated with the solar collector, the air source heat pump, the control valve, the solar circulation pump and the hot water supply pump.

[0010] Preferably, a liquid level detector is arranged in the heat storage water tank, and the control center is electrically connected to the liquid level detector.

[0011] Preferably, the water outlet of the solar collector and the water outlet of the air source heat pump are respectively connected to temperature sensors, and a temperature sensor is also arranged in the heat storage water tank, and the temperature sensors are signal-connected to the control center.

[0012] Preferably, the solar collector is a direct heat exchange flat plate type solar collector, the air source heat pump includes a liquid accumulator, the outlet of the liquid accumulator is communicated with an evaporator, the evaporator is communicated with a compressor, the compressor is communicated with a condenser, the water inlet of a water supply channel connected to the condenser is communicated with the second water outlet, and the water outlet of the water supply channel is communicated with the second water inlet.

[0013] Preferably, the control center includes a PLC controller, and the basic unit of the PLC controller includes a central processing unit, a power supply and a digital input and output module

[0014] Compared with the prior art, the beneficial effects of the utility model lie in: the utility model uses solar energy as heat source, which can not only reduce energy consumption, but also realize energy saving and emission reduction. Meanwhile, considering that solar energy is unstable to a great extent due to the influence of day and night, season, climate and other factors, the utility model uses solar energy and air energy in coupling, converts the heat energy in air into the heat energy of water in the heat storage water tank through the air source heat pump, and then provides the heat energy of hot water to the dryer for drying melons and fruits in the drying room. The air source heat pump heat exchange system of the utility model is not affected by rainy and snowy weather and night, and can be used all the year round. Therefore, the intelligent complementary use of the solar energy collector and the air source heat pump in drying not only does not produce pollution, but also does not waste too much energy, and can also speed up the drying efficiency, and further improve the energy utilization rate. The utility model designs the control center, which is convenient for intelligently controlling the solar heat exchange system and the air source heat pump heat exchange system in an optimal mode to ensure the drying temperature and the energy saving and continuity of energy utilization, and provides a more economical and convenient drying system for farmers. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is the structure schematic diagram of the drying room drying system of the utility model in this embodiment by coupling solar energy and air energy;

[0017] Figure 2 It is the drying system structure diagram of the solar energy collector independent operation of the utility model in this embodiment;

[0018] Figure 3 It is the drying system structure diagram of the air source heat pump independent operation of the utility model in this embodiment;

[0019] Figure 4 It is the main circuit diagram of the drying control system of the utility model in this embodiment. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model will be further described in combination with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the utility model, and cannot limit the protection scope of the utility model.

[0021] As Figure 1As shown, this embodiment provides a drying room system that couples solar energy with air energy, including: a solar collector 1, an air source heat pump 2, a hot water storage tank 3, a drying chamber 4, a control center 5, a connecting valve 6, and a dryer 7 connected to the drying chamber;

[0022] The hot water storage tank 3 includes a first water outlet 301, a second water outlet 302, a third water outlet 303, a first water inlet 304, a second water inlet 305, a third water inlet 306, and a fourth water inlet 307. The first water outlet 301 is connected to the water inlet of the solar collector 1 through a valve. The second water outlet 302 is connected to the water inlet of the air source heat pump 2. The third water outlet 303 is connected to the water supply inlet of the dryer 7.

[0023] The first water inlet 304 is connected to the water outlet of the solar collector 1, the second water inlet 305 is connected to the water outlet of the air source heat pump 2, the third water inlet 306 is connected to the water outlet of the dryer 7, and the fourth water inlet 307 is connected to an external water source.

[0024] Each of the above connecting passages is equipped with a control valve. A solar circulation pump 8 is installed in the passage connecting the first outlet 301 to the inlet of the solar collector 1. A hot water pump 9 is installed in the passage connecting the third outlet 303 to the water supply inlet of the dryer 7. A level sensor is installed inside the hot water storage tank 3, and the control center 5 is electrically connected to the level sensor. Temperature sensors are connected to the outlets of the solar collector 1 and the air source heat pump 2, respectively. A temperature sensor is also installed inside the hot water storage tank 3. The control center 5 includes a PLC controller, whose basic units include a central processing unit, a power supply, and digital input / output modules. The PLC controller is electrically or signal-connected to the solar collector, the air source heat pump, the control valves, the temperature sensors, and other water pumps.

[0025] like Figure 1 and 4 As shown, the drying system described above in this embodiment forms three thermal cycles. Most of the heat required by the hot water storage tank 3 comes from the solar collector 1 of the first thermal cycle. The air source heat pump 2 of the second thermal cycle is mainly responsible for auxiliary heating of the entire system when the solar collector 1 cannot provide the heat required by the system. The control center 5 controls the opening or closing of the first and second thermal cycles to ensure and regulate the water temperature of the third thermal cycle to meet the drying temperature requirements in the drying room.

[0026] In other specific embodiments, the solar collector 1 adopts a direct heat exchange flat-plate solar collector. It is simple to install, low in cost, and has high reliability and pressure resistance. The direct heat exchange of the flat-plate solar collector means that the energy absorbed by the collector is directly stored in the water tank, resulting in a higher energy conversion rate, greater energy efficiency, and overall cost reduction.

[0027] In other specific embodiments, the air source heat pump 2 is a model BKGR03D air source heat pump with a rated water temperature of 75℃ and a maximum of 80℃. Specifically, it includes a liquid receiver 201, the outlet of which is connected to an evaporator 203, the evaporator 203 to a compressor 204, and the compressor 204 to a condenser 202. The inlet of the water supply channel of the air source heat pump 2, connected to the condenser 202, is connected to the second outlet 302, and the outlet of its water supply channel is connected to the second inlet 305. In this embodiment, the air source heat pump 2 serves as the second heat source for the system. When the solar collector 1 cannot provide the heat required for the system's operation, the control system will activate the air source heat pump to ensure a constant temperature during the drying process. When the internal temperature of the hot water storage tank 3 reaches the set temperature, the system will shut down the air source heat pump 2, keeping it in a dormant state.

[0028] In other specific embodiments, the PLC controller of control center 5 adopts a Siemens S7-200 as the controller for the entire system, and the central processing unit adopts the CPU226 specification, with 24 input / 16 output digital I / O ports to meet the system's I / O requirements. The digital input / output module adopts the EM235 AI4 / AQ1 analog input / output module, which has four analog input modules and one output module, using DC24V power supply. It can be powered by the CPU module's sensor power supply (DC24V / 400mA) or by a user-provided power supply. The main circuit diagram of the drying control system in this embodiment is as follows. Figure 4As shown, FU is a fuse, mainly used for short-circuit protection to prevent severe overload of electrical equipment. QF1 is the main control air switch for the entire system circuit, protecting the entire main circuit and quickly disconnecting it in case of a fault. QF2 is the air switch for the solar circulating pump, responsible for undervoltage and short-circuit protection. QF3 is the air switch for the air source heat pump, responsible for the stable operation of the air source heat pump system, providing undervoltage and short-circuit protection. QF4 and QF5 are the air switches for the frequency converter and the hot water pump M, respectively, ensuring the stable operation of the frequency converter and the hot water pump M. Thermal relays are used for protection of all electrical components in the circuit, providing overload protection for the solar circulating pump, air source heat pump, and hot water pump M. KM1 to KM4 are contactors, electrical components used for frequent switching, with remote operation and undervoltage protection functions, used to control the solar circulating pump, air source heat pump, and hot water pump M.

[0029] The drying system in this embodiment operates as follows:

[0030] like Figure 2 As shown, under good weather conditions or with sufficient sunshine during the day, if the temperature of the water outlet of the solar collector 1 and the temperature of the hot water storage tank 3 exceed the set temperature threshold, the control center 5 will control the solar collector 1 to operate independently. Water flowing through the solar collector 1 absorbs heat and enters the hot water storage tank 3. When the temperature inside the hot water storage tank 3 reaches the drying requirement, the control center 5 will transfer the hot water from the storage tank 3 to the drying chamber 4 and simultaneously start the fan to blow hot air into the drying chamber 4 for circulating heating. At this time, the solar collector 1 has already met the heating requirements by operating independently, so the air source heat pump 2 heating unit is not activated, and the solar collector 1 provides heat independently, utilizing sunlight entirely to achieve complete energy savings.

[0031] like Figure 3As shown, at night, the solar collector 2 cannot absorb heat from sunlight and cannot supply the heat energy required for drying. At this time, the air source heat pump 2 operates independently. When the air source heat pump 2 is running, the working fluid stored in the liquid receiver 201 is transported to the evaporator 203 through a throttling valve. Subsequently, the compressor 205 uses a small amount of electrical energy to absorb heat from the surrounding air and flows through the evaporator 203, where this heat exchanges energy with the working fluid. The working fluid, after absorbing energy, exchanges heat with the flowing water in the condenser 206, becoming a low-temperature gas. After being depressurized by the throttling valve, it becomes a gas-liquid coexistence state and enters the liquid receiver 202. The discharged heat is absorbed by the water and becomes hot water that flows into the hot water storage tank 3. The heat absorbed from the surrounding air heats the hot water storage tank 3. The heated water is then supplied to the drying chamber 4 by the hot water pump 9 and dissipated through the heat sink and heating fan, thus achieving a better heating effect at night.

[0032] like Figure 1 As shown, in practice, due to uncontrollable weather factors, sunlight is easily affected by external factors such as weather and environment. The heat from solar radiation cannot meet the heat required for drying. At this time, the control center 5 will start the air source heat pump 2 for auxiliary heating. When there is sufficient sunshine, the system uses the solar collector 1 for heating, and the air source heat pump 2 is in standby mode, consuming only a small amount of electricity. When the sunshine is insufficient or the sunshine duration is short, the air source heat pump 2 switches to the running state for auxiliary heating. When the temperature in the hot water storage tank 3 reaches the set temperature, the system will automatically switch the air source heat pump 2 to the standby state to achieve energy saving. In addition, if rapid drying is required or a large number of crops need to be dried, the air source heat pump 2 can also be directly set to the running state, using both the air source heat pump 2 and the solar collector 1 for dual heating to achieve rapid drying.

[0033] In this embodiment, the liquid level in the hot water storage tank 3 is adjusted by a liquid level sensor. If the water level in the hot water storage tank 3 is lower than the specified level, the control center 5 will open the fourth water inlet 307 of the hot water storage tank 3 to ensure that the requirements are met.

[0034] This utility model is not limited to the embodiments discussed above. The above description of specific embodiments is intended to describe and illustrate the technical solutions involved in this utility model. Obvious modifications or substitutions based on the teachings of this utility model should also be considered to fall within the protection scope of this utility model. The above specific embodiments are used to disclose the best implementation method of this utility model, so that those skilled in the art can apply various embodiments and alternatives of this utility model to achieve the purpose of this utility model.

Claims

1. A solar coupled air energy drying system for a drying room, characterized in that, The utility model relates to a solar energy collector, air source heat pump, heat storage water tank, drying chamber, control center, connecting valve and dryer which are communicated with the drying chamber. The heat storage water tank comprises a first water outlet, a second water outlet, a third water outlet, a first water inlet, a second water inlet, a third water inlet and a fourth water inlet, the first water outlet is communicated with the water inlet of the solar energy collector through a valve, the second water outlet is communicated with the water inlet of the air source heat pump, and the third water outlet is communicated with the water inlet of the dryer. The first water inlet is communicated with the water outlet of the solar energy collector, the second water inlet is communicated with the water outlet of the air source heat pump, the third water inlet is communicated with the water outlet of the dryer, and the fourth water inlet is communicated with an external water source. The above-mentioned communication channels are provided with control valves, the channel, which is communicated with the water inlet of the solar energy collector, of the first water outlet is provided with a solar energy circulating pump, and the channel, which is communicated with the water inlet of the dryer, of the third water outlet is provided with a hot water supply pump. The control center is electrically communicated with the solar energy collector, the air source heat pump, the control valve, the solar energy circulating pump and the hot water supply pump. A liquid level detector is arranged in the heat storage water tank, and the control center is electrically connected with the liquid level detector.

2. The solar coupled air energy drying system of claim 1, wherein, The water outlet of the solar energy collector and the water outlet of the air source heat pump are respectively connected with temperature sensors, and the inside of the heat storage water tank is also provided with a temperature sensor, and the temperature sensors are signal communicated with the control center.

3. The solar coupled air energy drying system of claim 1, wherein, The solar energy collector is a direct heat exchange flat-plate type solar energy collector, the air source heat pump comprises a liquid accumulator, the outlet of the liquid accumulator is communicated with an evaporator, the evaporator is communicated with a compressor, the compressor is communicated with a condenser, the water inlet of the water supply channel connected with the condenser is communicated with the second water outlet, and the water outlet of the water supply channel is communicated with the second water inlet.

4. The solar coupled air energy drying system of claim 1, wherein, The control center comprises a PLC controller, and the basic unit of the PLC controller comprises a central processing unit, a power supply and a digital input and output module.

5. The solar coupled air energy drying system of claim 1, wherein, ​

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