Research On Dynamic Simulation And Control System Of Capillary Plane Radiation Air-conditioning

At present, the air-conditioning systems remove indoor heat and humidity load mainly by convection heat transfer, and use the same low temperature sources; sensible heat load could have been eliminated by high temperature sources, yet uses the same temperature sources with dehumidification, making energy sources waste in grade. Capillary plane air-conditioning system can make temperature and humidity independent control, indoor latent and sensible heat load are undertaken by dedicated outdoor air system and capillary radiation plane respectively. It is a cozy, energy-efficient air-conditioning system, and could maintain good indoor air quality.Based on the research and development in both domestic and overseas on radiation air-conditioning, in this paper studied fresh air system, load calculation and control system of capillary plane air-conditioning. Obtained a method of load calculation that was suitable for this air-conditioning system, this provided a theoretical basis for its practical application.Firstly, discussed liquid desiccant dehumidification and heat recovery, obtained that it applied for capillary plane air-conditioning fresh air system, can get higher heat recovery efficiency and any fresh air parameters. Analysis the space moisture load sources of capillary plane air-conditioning, get that it was mainly from human, open-wide water and plants in general office buildings.Secondly, analyzed Indoor humidity ratio and temperature dynamic change in fresh air set-up period, and proposed the conception of fresh air pre-dehumidification time. Taking Jinan city as an example, calculated that if pre-dehumidification time was limited in 30 minutes, the volume of fresh air was the 1.3 times of the requirement of personnel and sanitary; in the normal period, the minimum fresh air volume could meet the requirement of room dehumidification.Thirdly, established the capillary plane radiation dynamic model, simulated and studied the heat transfer process of air conditioning room and outdoor environment with CFD in unsteady state, when capillary panel laid on the ceiling, part on west wall, part on north wall, on the wall. Based on simulation results found the heat flux through the exterior wall and window was lowest, it could save 25% energy, when capillary panel laid on the ceiling; it also could save more than 20% energy, when parts laid on the wall. According to the numerical calculation results, obtained the capillary plane air-conditioning load correction coefficient was 0.75-0.8 in summer. The correction coefficient was 0.75, when capillary panel laid on the ceiling; it was 0.75-0.8, when parts laid on the wall, this providing a theoretical basis for its design.Finally, analyzed advantages and disadvantages of general control strategy, obtained capillary radiation panel with intermittent flow control was simple, practicable and energy conservation. Provided control diagram of the fresh air system, capillary radiation panel cooling system and capillary radiation panel cooling system plus fresh air system.