A heat pump drying system

Abstract

The invention provides a heat pump drying system. The heat pump drying system comprises a drying chamber, a fan, a first evaporator, a second evaporator, a compressor, a condenser, a throttle valve, afirst outside air damper, a second outside air damper, a first air filter, a second air filter, a heat exchanger, a three-way valve, a controller and a temperature and humidity sensor. The first evaporator and the second evaporator arranged in parallel, and the first evaporator and a coiled pipe of the condenser are connected in series; the fan is arranged between the first evaporator and the second evaporator; and an air outlet of the fan directly faces an air inlet of the condenser and communicates with the air inlet of the condenser, so that large-flow dry air is supplied. A bypass pipeline is arranged on a connecting pipeline between the compressor and the condenser, the bypass pipeline enters the condenser at a predetermined distance H from an inlet point of the coiled pipe of the condenser and communicates with the coiled pipe, and a three-way valve is arranged at the intersection between the bypass pipeline and the connecting pipeline. By driving the three-way valve, the heat dissipation performance of the condenser can be changed, and the heat balance can be conveniently controlled.

Description

technical field [0001] The invention belongs to the field of drying, and in particular relates to a heat pump drying system. Background technique [0002] The heat pump can effectively recover the latent and sensible heat in the humid air, significantly improving energy utilization. The drying medium flow rate, temperature and humidity required by different products to be dried are not the same. When the product to be dried at one time in the drying room is large, it is usually necessary to increase the supply of drying medium per unit time, otherwise it will be necessary to extend the drying time. The unit drying time will reduce the production efficiency. Moreover, the product and quantity to be dried may be different each time, so the supply of drying medium and temperature and humidity must be adjusted accordingly each time. However, the heat transfer performance of the condenser in the existing heat pump drying system is not easy to adjust, and a single evaporator con...

AI Technical Summary

Problems solved by technology

However, the heat transfer performance of the condenser in the existing heat pump drying system is not easy to adjust, and a single evaporator and condenser connected in series cannot meet the technological requirements of large flow drying media

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