Drying heat pump system adopting air energy open type humidity-eliminating mode and closed type dehumidifying mode

Abstract

The invention provides a drying heat pump system adopting an air energy open type humidity-eliminating mode and a closed type dehumidifying mode. The drying heat pump system comprises a first heat exchange region with an evaporator, a second heat exchange region with a condenser, a third heat exchange region, a compressor region and an air return region, wherein a first air flue for enabling the compressor region to communicate with the second heat exchange region and a second air flue for enabling the first heat exchange region to communicate with the air return region are arranged in the third heat exchange region; the first heat exchange region is equipped with a fresh air door and an air outlet; a hot air outlet is formed in the second heat exchange region; an air return hole is formed in the air return region; a first switching door capable of opening a channel between the two regions and the air outlet is arranged between the first heat exchange region and the compressor region; and a second switching valve capable of opening a channel between the two regions and the second air flue is arranged between the second heat exchange region and the air return region. With the adoption of the drying heat pump system, switching between the air energy open type humidity-eliminating mode and the closed type dehumidifying mode can be realized at different time quantum for material drying, defects of single-mode drying are avoided; and the drying heat pump system has wider drying process adaptation and realizes efficient energy-saving and drying performances.

Description

technical field [0001] The present invention relates to a drying equipment, more specifically, to a drying heat pump system with dual modes of air-energy open dehumidification and closed dehumidification. Background technique [0002] Drying is an important process in the production process of industry, agricultural and sideline products and food processing industries. The drying process is a process of high energy consumption. The drying device and its drying process control are closely related to the quality of the dried processed products, and are also related to production efficiency, cost, are closely related to energy consumption. [0003] A heat pump is a device that consumes part of the electric energy to transfer heat from a low-temperature heat source to a high-temperature heat source. Compared with the traditional drying method, the heating coefficient of performance (COP) of the heat pump can reach more than 4.0. The heat pump drying has high efficiency, energy s...

AI Technical Summary

Problems solved by technology

However, when the air-energy high-temperature heat pump system is drying materials, the waste heat and moisture in the system will become larger and larger. Generally, the waste heat and moisture need to be discharged directly to achieve the purpose of dehumidification. At the same time, the heat in the waste heat and moisture is taken away, wasting energy

The closed dehumidification heat pump system uses the principle of freezing and dehumidification, uses the evaporator to cool the humid air below the dew point temperature, and after the moisture is precipitated, the condenser is used to heat the cooled dry air to achieve the purpose of dehumidification; In the later stage, the moisture in the circulating air will become smaller and smaller, and the water latent heat obtained by the evaporator from the return air will also become smaller and smaller, making it harder for the circulating air to heat up. Heating to meet the temperature requirements of the drying process, it can be seen that this system consumes a lot of electricity

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