Experiment Study On The Properties Of The Solid Desiccant Bed Regenerated With Solar Directly

Countries building energy consumption accounts for the proportion of the total energy consumption up to25～28%. Heating, ventilation and air conditioning system energy consumption accounts for50%of the total building energy consumption, and carbon emission accounts for the proportion of the total emission up to38～40%.Therefore, decrease fossil fuel consumption of air-conditioning system and application of renewable energy sources (such as solar energy) is important for building energy saving. Using traditional vapor compression refrigeration for cooling and dehumidification, air must be cooled below the dew point temperature, which will consume large amounts of high grade energy. This paper designs a new kind of solid desiccant bed which use solar energy directly as a renewable energy, and explores the dehumidification and regeneration performance research to provide experiment basis for the engineering application. Through literature study, the reason why the whole system is not high is that traditional desiccant bed which use solar heating system to convert energy into regeneration desiccant materials have secondary conversion of energy and relatively low efficiency. In this paper, direct use of solar radiation is an effective way of using the low grade energy to achieve the effect of energy saving. Dehumidification system using conventional, cheap, corrosion pores of the silica gel as adsorbent dehumidification, and choosing appropriate melting point of phase change materials as a cooling material, will release the latent heat of vaporization of water vapor desiccant into phase change storage energy, in order to reduce the rise of temperature of the system after dehumidification effect, and air conditioning refrigerating capacity.The desiccant bed thickness is50mm according to the experimental test results, and the effective dehumidification time of desiccantbed is95min by dehumidifying test.Based on different material desiccant dehumidification performance test,dehumidification quantity of the5cm silica gel desiccant bed is0.89kg,and average temperature rise was only0.89℃because of the system leakage air volume which lead to adsorption heat loss is big. The dehumidification quantity and average temperature rise of silica gel added phase change PK52desiccant bed is0.80kg and-0.67℃. The dehumidification quantity and average temperature rise of silica gel added phase unchange PK52desiccant bed is0.82kg and1.90℃The dehumidification quantity and average temperature rise of silica gel added phase change GR50desiccant bed is0.63kg and1.78℃. The average temperature of phase change desiccant bed is1.47℃lower than the pure silica gel desiccant bed, is2.57℃lower than the silicone added phase unchange PK52desiccant bed, is2.45℃lower than the silicone added phase change GR50desiccant bed.The test show that the effective regeneration time of5cm desiccant bed is3h, regeneration temperature is higher than70℃. Regeneration amount is a logarithmic growth curve of renewable time,&=6.5765In t-1.544, R2=0.9789; regeneration amount is a logarithmic growth curve of the solar radiation intensity,&=16.496In x-88.861, R2=0.9541; regeneration temperature is a logarithmic growth curve of the regeneration time, T=5.177In t+35.0711, R2=0.9415.