Difference between using traditional drying & Modern drying techniques using Dehydrators

Drying has been widely used in various fields of social production and life as an ancient process unit. However, drying consumes a significant amount of energy in social production. According to statistics, the drying process consumes at least 15% of the world’s energy. Even in the United Kingdom, drying consumes 13-15 percent of total energy. In the sphere of wood production, drying accounts for 70% of energy consumption, whereas drying accounts for 50% and 60% of energy consumption in the textile and grain processing industries, respectively. As a result, efforts have been made to increase the energy efficiency of drying.

In addition, the requirements for product quality and production efficiency have also prompted people to continuously improve the quality of drying products and shorten the working cycle of drying systems. The world’s first patent on the application of heat pumps in drying was born relatively early. In China, the case of heat pump drying system appeared relatively early, but its rise is in recent years. In recent years, the heat pump drying system has attracted the attention of the market with its high thermal efficiency and better drying quality, and has been gradually applied in recent years.

air dry egg tray dryer

What is a heat pump made of?

A typical heat pump drying system comprises of a drying chamber, an evaporator, a condenser, a compressor, and a throttle valve, as illustrated in the diagram. The drying medium (air) circuit and the heat pump working fluid circuit are formed by these components.

In recent years, the drying system with a heat pump at its center has gotten a lot of attention. The heat pump drying system has become a more popular topic in research, and its application and transaction value in industry have also increased. This is due to its own merits, which are worthy of consideration and implementation.

paper tray drying

Higher Production Effeciency

As we know, a heat pump has a more efficient heating capacity than direct energy supply, which is manifested in that its heating energy consumption ratio (COP) is always higher than 1. Energy is always conserved, and excess energy does not increase for no reason. However, in common heat pump applications, in addition to the electrical energy supplied by the compressor, other energy sources mainly come from the external heat energy absorbed by the evaporator, such as heat energy absorbed from the surrounding air, that is, air energy .


In a heat pump drying system, the thermal energy of the drying hot air originates from the thermal energy contained in the drying exhaust gas absorbed by the evaporator, in addition to the electric energy from the compressor. The calorific value of dry exhaust gas is particularly high because the heat energy is often high in temperature and contains a big amount of latent heat, and as an endothermic source, it can have a higher heating impact and high energy utilization efficiency than conventional heat pump air.

Because of this, no matter what type of heat pump drying system, it has the ability to recover the latent heat of drying exhaust gas, and at the same time, the heat pump drying system can achieve higher energy utilization efficiency. The researchers found that compared with steam drying, the energy saving rate can still reach about 40%-70% .


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