Dynamic Models ＆ Experimental Study On Capillary Grating Plane Air-conditioning System

With the advent of a new century and the rapid economic growth in China, energy problem has become the biggest obstacle in the development of our country, and the corresponding environmental problem limits our growth rate. Traditional air conditioning system based on the processing technique of coupling between temperature and humidity, it's need more than 20℃chilled water to meet indoor environmental requirements, but in order to dehumidify, the chilled water must decline to 7℃, and most indoor heat exchange adopt convection heat transfer, those don't accommodate the modern air conditioning request for energy saving, emission reduction and improving indoor comfortableness.Capillary grating plane air-conditioning system uses the low-temperature radiant technology, its temperature and humidity independent control, achieving grading utilization of energy and making natural cold source, evaporation source in the dry areas, industrial waste heat and solar energy apply to air conditioning engineering. Capillary grating plane is an air conditioning system terminal of energy conservation, comfort, space saving and remarkable economical benefits.In this paper, based on thermal process of capillary grating plane air-conditioning system, established its dynamical mathematical model, studied the influencing factors of its heat transfer, indoor airflow distribution, load calculation, indoor design parameters, fresh air volume and design parameters, air conditioning heat recovery theory and configuration. In the last, verified the reliability of theoretical analysis by experiment, providing reliable theory and practice evidences for the application of this air conditioning system. The contents include:(1) Beginning with studying factors of influencing comfortableness and comfort index, based on Professor Fanger thermal comfort index and in the same conditions on comfort and relative humidity, come to a conclusion that capillary grating plane air-conditioning system indoor design temperature is lower 1.6℃than traditional air conditioning system's heating in winter and on the contrary in summer.(2) From the beginning with analyzing capillary grating plane heat-transfer process, established a dynamical mathematical model, simplified and studied its thermal process.(3) Based on theoretical research, found out the factors of influencing capillary grating plane heat transfer; indoor temperature, velocity and contaminant concentration distribution and the calculation method of capillary grating plane air conditioning load by MATLAB programming and CFD simulation.(4) Established indoor humidity equilibrium equation, analyzed the calculation method of indoor humidity and provided the method of ensuing the volume and parameters of fresh air of capillary grating plane air-conditioning system and its operation strategy.(5) Analyzed the heat-transfer process of air conditioning heat recovery, established the mathematical model of indirect evaporation plate heat recovery equipment and obtained its reasonable structural parameters by CFD simulation.(6)Above theories and simulated result were verified by experiment, capillary plane heat elimination, indoor temperature, velocity and contaminant concentration distribution all can be satisfied the comfortable request very well and came to the designing standard. By setting up laboratory furniture, tested indirect evaporation plate heat recovery equipment and manifested that its heat recovery efficiency could be more than 70% in summer and above 60% in winter, though it is only in the condition of sensible heat recovery. Optimized heat recovery equipment parameters of number of heat transfer unit, fresh air and exhaust air radio by experiment.