With the linear increase in living standards, people have higher requirements for the health of food. It is recognized that pickled and canned agricultural products that can be stored for a long time have the disadvantages of carcinogenic factors or nutrient loss, and semi-finished products like marine fish also need to reduce the moisture content in the air or brought by the seafood itself at a certain temperature. Maintain the freshness storage period of seafood within a certain period of time. Product drying, as an important method of agricultural product processing, is to reduce the moisture in agricultural products to a certain level, extend the shelf life, and obtain dried products.

1. Drying method of agricultural products:

At present, there are many drying technologies on the market. According to different drying principles, drying is divided into heat pump drying, vacuum freeze drying, variable temperature and pressure difference puffing drying, microwave drying, and combined microwave and hot air drying. The dehumidification of the rotor, as a kind of drying, has also attracted much attention.

2. Desiccant rotor drying VS Heat pump drying VS Freeze-drying

	Desiccant Rotor dry	Heat pump dry	Freeze-drying
Advantage	Strong dehumidification ability	Low energy consumption	Low dehumidification efficiency
Disadvantage	High energy consumption	Limited dehumidification capacity	High energy consumption

The result shows:

In a high-humidity environment, the rotary heat pump coupled with dehumidification and drying can realize deep dehumidification and save energy consumption, especially for the drying of heat-sensitive materials, which has great application prospects.

In order to solve a series of material dehumidification and drying problems in heat pump drying, Puresci specially launched the low-temperature drying series rotor- PSL to help heat pump drying improve efficiency, reduce energy consumption, and improve material quality。

PSL is combined with different refrigeration methods for low-temperature drying

The dehumidificationof the rotor is actually a process in which two hot and cold fluids pass through the runner medium to achieve heat and mass transfer.For systems with different requirements for temperature reduction (30-45°C or 15-30°C), single (double) indirect evaporative cooling can be used, and solar energy, hot water, waste heat, condensation heat or electric heating can be used for regeneration.

Keywords:#Desiccant rotor #Energy consumption #Desiccant rotor drying # Heatpump drying #PSL