Study On The Performance Of Thermal Storage Kang With Paraffin And Water As Storage Medium Under Zero Coal Consumption

With the increase of the living level in the rural areas,the indoor environment comfort is put forward to a higher demanded.The traditional Kang heating methods are inadequate in comfort,safety,environmental pollution and health.The purpose of this paper is to improve the traditional heating way,and design a energy storage Kang which uses solar energy or electric energy as heat source,paraffin and water as energy storage medium to realize the"no coal heating"in the countryside.First,a solar energy storage Kang system is designed in this paper.Using No.35paraffin as phase change material?PCM?energy storage medium,the actual melting and solidification temperature and enthalpy value are determined through DSC test,and the amount of paraffin needed for the experiment is calculated.The experimental system is established,and the experimental conditions are designed and the measuring points are arranged.Secondly,the comparative analysis method is used to measure the temperature of Kang surface and sleeping environment of water-heating Kang and paraffin-heating Kang.When the water supply temperature is at 40.00?,45.00?and 50.00?,the thermal parameters such as temperature,temperature rising,cooling rate and temperature unevenness of the two kinds of heated Kang are analyzed.The optimal water supply temperatures of the water-heating Kang and the paraffin-heating Kang are 45.00?and40.00?respectively.A comparison between heating Kang and traditional Kang shows that traditional Kang surface temperature unevenness is 49.50?,while the water-heating Kang is only 0.14?.Water-heating Kang effectively reduce the traditional Kang surface temperature unevenness.And water and PCM heating storage Kang in terms of safety and environmental protection compared to the traditional Kang has greatly improved.Compared with the traditional Kang,the PCM heating storage Kang can reduce CO₂emissions by 74.10t,SO₂ by 0.60t,and smoke and dust by 0.30t,respectively.Thirdly,combining water and paraffin as energy storage medium,the properties of energy storage Kang under different proportions of water and paraffin are studied.The higher the proportion of water in the thermal storage Kang,the higher the temperature of the Kang surface is,the faster the heating rate,the better the economy is,but the greater the temperature fluctuation of the Kang surface during the whole stage will be.By the proportions of Water and paraffin at 3:1 and 1:3,maximum temperature differences in heating Kang sleeping stage are 5.49?and 1.54?.The higher the paraffin ratio,the lower the temperature fluctuation of the Kang surface is.In particular,the sleep stage can reach the latent heat release stage earlier and the sleep environment is more comfortable.The thermal storage and exothermic process of water-coupled-paraffin heating Kang are simulated by using Fluent Software.The results show that water accelerates heat transfer compared with paraffin-heating Kang.Finally,by changing the operating strategy,the optimization has been made to improve the performance of heat storage Kang.Raising the water supply temperature and tube flow rate,direct sunlight can speed up the heating rate of Kang,but if the water supply temperature is too high,it will lead to inadequate utilization of paraffin latent heat.The temperature of water supply is 5?higher than that of the melting point of paraffin,and the latent heat of paraffin is fully utilized.Reducing heating time can reduce energy consumption,costs and make full use of latent heat of paraffin.Combined regulation of water supply temperature can speed up heating rate.The sleep thermal comfort can be improved by heating the Kang body with the"valley price"at night,and it can further reduce costs.