Research On Coupling Mode Of Multi-energy Complementary Heating System Of Bulk Curing Barn Of Solar Energy, Heat Pump,and Waste Heat Of Humid Air

The tobacco flue-curing is the process to dry the fresh tobacco leaves with a moisture content of80%～90%to10%moisture under the premise of guaranteeing the intrinsic physical properties, chemical composition, appearance and quality and so on of the tobacco leaves. Bulk curing barn has the characteristics of huge density for containing the tobacco, high degree of automation, simple operation, adapt to the production and development of large-scale and low operating costs etc., thereby getting a great deal of promotion and application. Currently, the heating of domestic bulk curing barn is mainly for coal, and the effective energy consumption accounts for only20%-35%of low calorific value of coals. The invalid energy consumption of bulk curing barn in China is too high, and it is with huge energy-saving potential.In order to ensure tobacco color, content of its active ingredient etc., there are strict requirements of indoor thermal environment in baking room at various stages of flue-cured tobacco barn. Heat load refers to the supply of required heat to the room within unit time to maintain hot and humid environment of the building. The heat load during flue-cured tobacco process of bulk curing barn mainly includes two parts of the heat load generated by the external protection structure outside the baking room, and the heat load produced by dehydration of tobacco leaves. In this paper, the author will analyze the distribution law of heat load of the bulk curing barn through the actual measurement and mathematical calculation.Solar energy is the world’s richest permanent clean energy, it is available at anywhere without any need for corresponding exploitation and transportation, or without any state monopoly. China has abundant solar energy resources, especially in Yunnan, the amount of solar radiation is very large and suitable for development and utilization. The heat pump is composed by a compressor, expansion valve, an evaporator and a condenser etc. The condenser is used to measure the cooling system releasing heat for heating, its COP is constant greater than1, it has a highly efficient in energy-saving device. The volume of moisture exhausting airflow for heat loss in bulk curing barn is of about10%, or may even be of25%. Therefore, reasonable recycling of humidity and waste heat in bulk curing barn has important significance for energy conservation of tobacco flue-curing. Since the21st century, the recycling of solar energy, heat pump technology, humidity and waste heat of bulk curing barn have been in wide research and application, and the corresponding energy efficiency has been verified accordingly. In order to achieve better energy efficiency, this paper proposes the multi-energy complementary heating system such as bulk curing barn’s solar energy, air source heat pump, humidity and waste heat of the baking room etc., and builds various coupling modes. This paper makes thermal analysis of the heating system of solar energy, air source heat pump, barn humidity and waste heat through the establishment of a mathematical model, and compare with economy of multi-energy complementary heating mode of solar energy, air source heat pump, barn humidity and waste heat and conventional heating mode for bulk curing barn. The results show that multi-energy complementary heating system of solar energy, air source heat pump, barn humidity and waste heat has better energy conservation and economic benefit for tobacco flue-curing.