1. Comparing the advantages and disadvantages of the drying cost: as far as the drying cost is concerned, it includes the electricity fee, labor cost, damage rate of drying materials, failure rate of the dryer, purchase cost and so on.
2. the advantages of freeze-drying and vacuum drying are: strong technology, but obvious disadvantages: at present, the equipment has not been mass-produced, and it is only promoted in a small amount in the market, and the price is relatively high. However, electric heating is converted into heat energy by electric power, so the high electricity cost has become the biggest disadvantage of electric heating.
3. The disadvantages of drying in the shade and drying in the sun are that it requires labor cost to turn over, which is time-consuming and laborious. The heat pump dryer applies the inverse Carnot principle, which can efficiently transfer the heat in the air to the drying room for "free" drying of materials. Its advantages are naturally power saving, environmental protection and high energy efficiency, but its disadvantage is that it needs to build an air energy heat pump drying room, which is more suitable for large-scale batch drying.
4. Comparison of advantages and disadvantages of drying range of materials: The drying materials mainly include seafood with high water content in protein, fruits and vegetables with high sugar content, perishable fruits and vegetables, and rhizomes with strong water retention, etc. The advantages of vacuum and freeze-drying are that they can dry materials that are not heat-resistant and afraid of oxidation, while some fruits and vegetables can't be dried because they are afraid of cold, such as banana slices that are damaged by drying. The disadvantage of sun-drying and shade-drying is that it can only be used for roots with low water content and is not easy to rot. Uneven sun-drying of seafood is easy to cause internal rot and deterioration.
5. The heat pump dryer can dry almost all materials. As far as the materials dried by Zhengxu are concerned, they include seafood such as sea cucumber, starfish, squid and abalone, fruits such as persimmons, bananas, apples and lychees, chemical coatings such as helmet paint drying, and fuels such as coal and sludge drying. The advantages of heat pump drying are wide drying range and strong adaptability.
6. Comparison of advantages and disadvantages of drying effect: The drying of Chinese medicinal materials is the most important requirement for drying effect, because too high temperature will easily lead to changes in medicinal properties or effective components. Obviously, the control of temperature is the most critical. The disadvantage of sun drying is that the temperature can't be controlled naturally, and the sun drying temperature is high at noon, sometimes it is cloudy or sunny, which leads to the failure of the sun drying process of Chinese herbal medicines to ensure the efficacy. Secondly, the drying of medicinal materials has not been heard of vacuum drying or freeze drying. The disadvantage of freeze-drying is that it is inconvenient to store the water of medicinal materials into ice, and it is also uncomfortable for doctors to prescribe drugs according to the standard of 1g of dried medicinal materials.
7. In order to meet the temperature and humidity control of Chinese medicinal materials, the heat pump dryer adopts the PLC control system (including the control panel) designed by Zhengxu R&D team, which is equipped with the advantages of Zhengxu modular drying mode and drying temperature setting. The advantage of heat pump dryer is that it allows Chinese herbal medicine to evaporate water at the best drying temperature without destroying its chemical composition.
8. To sum up, the heat pump dryer has many advantages but few disadvantages, which is recognized by the drying market. The heat source of air energy is free air, and there is no pollution like Hainan boiler drying betel nut. Non-toxic and sealed environmental protection refrigerant is more helpful to reduce the drying cost, which is conducive to the promotion of materials in the market and benefit more people.