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What is the development and application of duplex dryer?

What is the development and application of duplex dryer?

Solar drying is another main form of solar thermal utilization. There are generally two drying methods: one is direct suction type, also known as open type; the other is indirect absorption type, also called convection drying type. The former is the traditional sun exposure, which requires direct sunlight and a large area of ​​drying platform, […]