Study On Key Technology Of Residence Under The Condition Of Compound Heating Of Underfloor Air Distribution And Low Temperature Radiant Floor Heating

With the development of economy and society,the problems with regard to energy,health and environment are growing rapidly in the world nowadays,people pay more and more attention to indoor air quality in the pursuit of beautiful and comfortable living space at the same time.Ventilation is a kind of effective means to improve indoor air quality,In developed countries such as the United States,Japan and the European Union,primary air system has been popularized,however,in our country,the popularity rate of primary air system is very low.For purpose of satisfy the energy demand of building heating or cooling,demand for primary air system will gradually increase.At present,the study of ventilation technology and low temperature floor radiant heating is more,low temperature floor radiant heating has been widely used due to the advantages of energy conservation,comfort and space saving,but the research on radiant heating and air composite system is less.Therefore,compound of underfloor air distribution and low temperature radiant floor heating is an air conditioning system possessing great potential and application value,in favor of the further development and improvement to new residential unite heating technology for giving consideration to comfort and energy demand.This issue takes the room applying of low temperature radiant floor heating and underfloor air distribution compound system as research object,discusses influence mechanism of compound system to indoor thermal environment.First of all,design and calculation theory basis of compound heating system is put forward with concept of temperature and humidity independent control.Secondly,experimental platform combining radiant cooling(hot)with primary air system and with the function of heat recovery is set up.On basis of the experimental platform,the interior flow field of compound system characteristic has carried on the experimental study under different working conditions.Finally,with the measured data as boundary conditions,this paper makes the numerical simulation calculation on the room application of compound heating room,analyzes the indoor temperature,velocity profile,PMV-PPD index and indoor vertical temperature gradient,and contrasts part of the simulation values and measured values.The results show that,when the amount of blast is constant,the floor surface temperature range is 25 ~ 27 ?,the scope of air supply temperature change is 18 ~ 20 ? and the air supply velocity is approximately 0.4 m/s,the indoor temperature,velocity profile,PMV-PPD index and indoor vertical temperature gradient are controlled within a given range,thus ensuring indoor thermal comfortableness.