Heat pump control method for dehumidification and drying

Abstract

The invention relates to a heat pump control method for dehumidification and drying. A heat pump drying system, a heat pump dehumidification system and a ventilation system are established according to three factors of drying, dehumidification and ventilation, and according to the process requirements of current products, the heat pump control method for dehumidification and drying based on the heat pump drying system, the heat pump dehumidification system and the ventilation system is established. The heat pump control method for dehumidification and drying includes the steps that air sourcemulti-dimensional treatment type dehumidification and drying control is established, and according to the requirements of different process working conditions, air from a drying room can be simultaneously dehumidified and heated to meet the requirement of dehumidification; heat can be also absorbed from the external environment space, the heat is transferred to the drying room, and the requirementof the high temperature environment is met; and when the humidity of a unit is high, dehumidification and fresh air entering are conducted, total heat recovery is conducted on fresh air and dehumidification , and the heat loss during dehumidification is effectively avoided. Not only is the requirement of dehumidification under the low temperature working condition met, but also the requirements of dehumidification and drying at high temperature are ensured, the drying effect of the products is ensured, and the operating costs of the products are reduced.

Description

technical field [0001] The invention belongs to the field of hot air drying, and in particular relates to a heat pump control method for dehumidification and drying. Background technique [0002] At present, there are more and more places that need hot air drying in the market, such as tobacco drying, grain drying, medicinal materials drying, fruit and vegetable drying and other drying places. Coal furnaces, gas furnaces and electric furnaces are mainly used for drying. Coal and gas are non-renewable strategic energy sources, which are not the direction of national promotion. Electric furnaces are not suitable for mass promotion because of their high energy consumption and high operating costs. Due to the many reasons mentioned above, heat pump dryers are now gradually being accepted by the market because of their many advantages such as energy saving, environmental protection, and high drying quality. There are two main types of drying heat pumps on the market, one is hot ...

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Problems solved by technology

[0006] The invention application with the application number 201610094280.6 discloses a drying dehumidifier, including a compressor, an indoor condenser, an outdoor evaporator, a first throttle valve, an outdoor heat exchanger and a control system. The dehumidification circulation pipeline and the low-temperature dehumidification circulation pipeline, the controller controls the circulation of the refrigerant in the corresponding circulation pipeline, and can heat up or cool down the dehumidification of the material, thereby overcoming the drying and dehumidification heat pump unit in the prior art that only has the function of heating and dehumidification Mode, but not the defect of low temperature dehumidification of materials

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