Thermal Environment Simulation And Energy Consumption Analysis Of Radiant Floor Cooling Combining With Displacement Ventilation In The Air Conditioned Room

Displacement ventilation with floor radiation cooling/heating (complex air-conditioning for short) is a rather perfect air-conditioning way, which uses low temperature hot water (no higher than 60℃for heating) or mild temperature (for cooling) as heat medium, it heats or cools the floor equably by the heat exchange pipes buried under the floor and radiate energy to the indoor environment equably, and accordingly, indoor air temperature is accommodated. Besides, the displacement ventilation system sends warm or cool fresh air to indoor environment to avoid condensation and also provides some quantity of heat. The complex air-conditioning is energy saving, can exchange heat equably, provides fresh air, occupies no space and handsome, what's more, human thermal comfort is well satisfied with this air-conditioning system, which make it become a new comfortable air-conditioning way. It's widely used in residential buildings of some occident's, and it suited not only for residential buildings and villas but also for public buildings with big space and large span, such as hotels, exhibition halls, swimming pools, dancing rooms and gymnasiums.The complex air-conditioning concentrates the floor heating, cooling, fresh air and living hot water as an aggregation, provides cooling in summer and heating in winter by the same floor radiation pipeline, and meanwhile, it achieves intelligent area control and provides fresh air, simulates the most adjacent air environment with nature, and this is why it's called"natural air-conditioning", it can also achieve free cooling and living hot water. It's widely used in advanced residential buildings, villas and public.The article developed a radiation model of floor radiant cooling and displacement ventilation of an air conditioned room. simulated the indoor thermal-humidity distribution using the software Fluent; simulated the velocity field,thermal field and humidity field at indoor peak cooling load under isothermal and non-isothermal condition with different temperature of floor; Analyzed the PMV-PPD thermal comfort index, and educed the changing rule of air-conditioning system parameters under human thermal comfortable situation, the results provides reference for design.The article set up a model of displacement ventilation with floor radiation cooling/heating system by the energy consumption simulation software EnergyPlus, simulated the energy consumption ratings under different air-conditioning conditions in summer, and compared them with the normal air-conditioning system. The result showed that it consumes more energy than the normal air-conditioning system in summer and less in winter, and take the whole year for consideration, it's more energy saving than normal system.As a new air-conditioning mode, the displacement ventilation with floor radiation cooling/heating system is more comfortable and energy saving, and deserves to be popularized and applied.