Single-refrigeration water-source heat pump grain cooling unit

Abstract

The invention relates to a single-refrigeration water-source heat pump grain cooling unit, which comprises a unit case. The unit is characterized in that an air mixing box is mounted at the front end of the unit case; an return air connecting pipe is mounted at a first inlet end of the air mixing case; a second inlet end of the air mixing box serves as a fresh air inlet end; a filter is mounted at an outlet end of the air mixing box; the coarse filter is connected with an inlet end of a cooler; an outlet end of the cooler is connected with an inlet end of an air collecting pipe; an outlet end of the air collecting pipe is connected with an inlet of a fan; an outlet of the fan is connected with an air supply connecting pipe and port; a refrigerating system is mounted at the back end of the unit case and comprises a compressor and a water-cooled condenser; the water-cooled condenser is provided with a water inlet interface and a water outlet interface; and a refrigerant outlet of the cooler is connected with an inlet of the compressor; an outlet of the condenser is connected with an inlet of the water-cooled condenser; and a refrigerant outlet of the water-cooled condenser is connected with a refrigerant inlet of the cooler. The single-refrigeration water-source heat pump grain cooling unit is energy-saving and efficient and stable in operation, and has the beneficial effects that the cost is lowered, continuous operation can be achieved, and the service efficiency is improved.

Description

technical field [0001] The invention relates to a single-cooling water source heat pump grain cooling unit and a low-temperature cooling system for granaries, in particular to a cooling unit and a low-temperature cooling system mainly used for cooling grain stored in bulk granaries to keep the quality of bulk grains stable. Background technique [0002] Keeping the average grain temperature below 15°C is called low-temperature storage in the grain industry, and the average grain temperature between 15°C and 20°C is called quasi-low temperature storage. The low-temperature storage of grain is recognized as a green, environmentally friendly, safe, and fresh-keeping method for grain storage. With the improvement of people's living standards, the requirements for food security and green pollution-free are getting higher and higher. The grain cooler can ensure the cooling function of bulk grain, has the advantages of keeping fresh and reducing the use of pesticides, and is used ...

AI Technical Summary

Problems solved by technology

[0006] (3) When the external temperature of the air-cooled grain cooler is high, the condensing temperature is high. If it is necessary to cool down to a lower temperature, the output of the unit is very reluctant, the unit is prone to overpressure protection, and the working efficiency is significantly reduced;

[0007] (4) Air-cooled grain cooler refrigeration compressors are generally equipped with 2-3 sets. Under automatic control and working conditions without return air, the number of operating compressors is controlled according to the outlet air temperature of the unit. The state will change greatly with the outdoor air, which will cause the compressor to start and stop frequently, not only the outlet air temperature should not be stable, but also reduce the cooling efficiency;

[0008] (5) The original grain cooler is equipped with a fluorine heater and an electric heater, which are used to reduce the relative humidity of the air after the evaporator. The purpose is to prevent the relative humidity from being too high; the moisture in the air is absorbed by the grain in the warehouse, causing the grain High moisture will affect the safe storage of grains; generally, the relative humidity of the air behind the evaporator is >95%, and the relative humidity is required to be reduced to 75%. The relative humidity is reduced to 75%, so that the temperature rises to 13°C; the installation of fluorine heaters and electric heaters not only reduces the cooling efficiency, but also increases the flow resistance of the air side, which greatly improves the overall energy consumption of the unit; Temperature to reduce relative humidity does not change the partial pressure of water vapor in the air, and has no effect on changing the adsorption of water vapor in grains. Many experiments have shown that the relative humidity of the air after the evaporator is reduced by temperature rise has no effect on changing the adsorption of grains. Adsorptive effect is not obvious;

[0009] (6) There is only one air inlet for the original air-cooled grain cooler, and the return air intake method is generally used for low-temperature operations in bulk flat warehouses, but the enthalpy of the fresh air outside the warehouse will be lower than the enthalpy of the return air in the warehouse during operation, which increases the operating energy consumption;

[0010] (7) The original grain cooler is air-cooled, and the condensation heat removed by the cooler during operation heats the air environment near the cooler, which is not conducive to the operation of the equipment, especially the fresh air has a greater impact as the incoming air

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