China Drying Network Heat pump dryers have high thermal efficiency, low energy consumption, and low drying temperature. They have the characteristics of maintaining the quality and sanitation of dried products. They are often used in food drying processes with high moisture content. However, the mainstream heat pump devices in the market are box-type structures, which have problems such as long drying time, small drying scale, difficulty in temperature change, and the like. How to take advantage of the heat pump dryer and overcome the above problems requires the following comprehensive measures: Measure one: Development of high temperature heat pump Research and application of more heat pump drying device is a low temperature heat pump drying device, which uses the refrigerant mainly R22 and R134a in the drying process, the drying temperature is generally not more than 65 °C. The development and supply of high temperature heat pumps with drying temperatures above 100°C are necessary for production. Carbon dioxide (R744) has unique advantages as a natural environment-friendly refrigerant. Some European countries, Japan, the United States, and other countries have conducted extensive research on CO2 heat pump water heater systems. Heat pump water heaters with CO2 transcritical circulation have appeared in the market. The temperature of hot water provided by heat pump water heaters using traditional refrigerants is generally less than 55°C, while the heat pump water heaters adopting CO2 transcritical cycle can provide high-temperature hot water of 90°C, and at the same time, its COP value can basically reach or even exceed the COP of conventional heat pumps. value. Therefore, the development of a heat pump dryer using a CO2 transcritical cycle has matured technically and has enabled high-temperature drying. Measure 2: Research on drying process Reasonable drying process can achieve high efficiency and energy saving. However, most of the studies have separated the drying system and the internal heat and mass transfer mechanism of the material, and lack systematic research. In order to apply the heat pump drying technology to the processing of agricultural and sideline products, it is necessary to study the drying processes that are suitable for different agricultural and sideline products and heat pumps. This requires the study of the relationship between the quality indicators of dry materials and the relationship between quality indicators and temperature, water content, and drying time. The best heat pump drying process provides the basis for the determination. Measure three: Development of dedicated heat pump There are many types of agricultural and sideline products, but different products have different characteristics. Therefore, through the research on the drying process, special heat pump products with obvious advantages in comprehensive technical and economic indicators can be developed for a specific product or a certain product. Measure four: Use joint drying to increase drying speed Heat pump drying has strong advantages in low-temperature drying, so the heat pump can be combined with other drying methods. The heat pump is used in the initial drying of the material to give full play to the characteristics of rapid dehumidification and energy saving in the low-temperature drying of the heat pump. In the middle and later period of the material drying, other drying methods are used to shorten the drying time during the whole drying process of the material. To achieve the purpose of energy efficiency. Cnc Machining Parts Precision,Cnc Machining Parts Aluminum,Cnc Machining Parts Machined Aluminum,Cnc Turning Parts Ningbo Yinzhou Leisheng Machinery Co.,Ltd , https://www.nblscasting.com