| Long-term since, people have tried to make the radiation heating into radiation cooling, but as the system designed largely due to condensate problems exist system failed, the phenomenon of leaking and pipeline rupture, and related technical problems are resolved, so people had to give up this air conditioning mode.But in recent years, with the radiant floor heating technology developed rapidly, the domestic floor heating technology has matures at present, but will the same set of equipment used in the summer of cooling to the canal is still tiny, if the pipes filling freezing water, in summer radiation and cooling, such not only reduced the equipment investment cost, but also provides a kind of brand-new air terminal mode.This paper respectively by means of a room of displacement ventilation and floor radiant cooling/displacement ventilation system, established the physical model, by RNG turbulent model and DO radiation model and combining with wall function method, the indoor gas flow chamber is described. Using the commercial software Fluent air conditioning mode of two different under the thermal environment inside the room was simulated, through different positions of defined by measuring the analyzed and contrasted two kind of room temperature gradient and the velocity gradient.Simulation results show that:â‘ the room air-conditioning systems in two different temperature and velocity distribution showed some similarities, but a separate room with displacement ventilation high temperature zone scattered, compound air conditioning system room near outer wall and high temperature zone concentration of external Windows to ceiling position, indicating that although the air temperature is low, the case of large velocity, displacement ventilation cooling effect of room air-conditioning system as complex room.â‘¡ composite air conditioning system of cold floor room for a lot of cold load, but did not change the airflow organization characteristics of displacement ventilation.â‘¢, people work area satisfies human body temperature gradient thermal comfort requirements, not appear worrying "cool" head of hot feet in floor radiant cooling/displacement ventilation system.â‘£optimization of hybrid air conditioning system found that increasing the air velocity did not improve the thermal comfort of people, but there will be hair feeling.This paper numerical simulation research and related data show that in good design conditions, the floor radiant cooling/displacement ventilation air-conditioning system can be better than common air conditioning system of thermal comfort of environment, it is a kind of ideal air conditioning mode, worth promoting . |
