Running Model Research On Capillary Floor Radiation Cooling Systems In Residential Building Of Chongqing

With the social and economic development,the improvement of people's living standards,the requirements of indoor comfort is also getting higher and higher.Capillary network is a new type of high-temperature cold water heating and cooling radiation end,compared to other air conditioning ends,with high comfort,health,environmental protection,energy saving and many other advantages.For hot summer and cold winter areas,the need for heating in winter and the need for cooling in summer,if only the floor radiation as a heating use,the summer will need to add a set of air conditioning system,which for most households is not economical,if will be integrated heating-cooling,we can make full use of floor radiation resources,but also can reduce the initial investment.In China,the floor heating technology has been quite mature,so this paper mainly studies experiment and analysis energy-saving on the capillary network radiation cooling.In this paper,the theoretical analysis,experimental data and simulation methods are used to study and analyze the air source heat pump and floor capillary network radiation cooling system.First of all,the heat transfer analysis of the convective heat transfer between the tube and the wall,the heat transfer of the wall and the filling layer,the leveling layer and the facing layer,the thermal convection of the floor surface and the heat transfer and the heat radiation are carried out.Secondly,the experimental study on the temperature of 20 ?,18 ?,16 ? and 14 ? water supply in continuous operation and intermittent operation is carried out.The cooling characteristics of capillary cooling are analyzed in detail by using the experimental data.The experimental results show that the outdoor temperature is 26.03 ~ 38.52 ?,the water temperature is 14 ~ 20 ?,the indoor hot and humid environment can meet the room temperature 24 ~ 28 ?,relative humidity ? 70% comfort requirements,capillary network floor cooling room vertical maximum temperature difference of 1.01 ?,the maximum temperature difference in the horizontal direction is 0.85 ?,the indoor temperature distribution is uniform and the comfort is better.When the water supply temperature is 14 ~ 20 ?,the effective heat dissipation per unit area is 29.74 ~ 44.52 W /m~2,in which the proportion of radiation heat transfer is about 80%,the proportion of convective heat transfer is about 20%,and the corresponding comprehensive heat transfer the coefficient is 6.45 ~ 6.72 W /(?.K).When the water temperature ? 14 ?,the floor structure layer is 50 mm bean sand concrete and 12 mm wood flooring to prevent the surface of the surface condensation.Finally,according to the experimental results of continuous cooling,duty cooling,intermittent cooling three operating modes,select a two-bedroom residential buildings in Chongqing,the use of DeST-h simulation of these three modes of operation of the building season and the energy efficiency model of the air source heat pump unit is established.The energy efficiency calculation formula of the heat pump unit is analyzed and the energy saving analysis and environmental protection analysis of the air source heat pump + capillary network floor radiation system under the condition of 18 ? water supply are carried out.The results show that the seasonal power consumption of the system is 1003.58 kW · h in the continuous cooling mode,and the seasonal power consumption of the system is 816.84 k W · h in the standby cooling mode.The intermittent operation mode system has 643.32 kW · h of seasonal power consumption,duty cooling rate of 18.61%,intermittent cooling rate of 35.90%.