Research On Trough - Type Solar Energy Absorption Air Conditioning System

The increasing large consumption of fossil fuels has not only caused seriousfossil fuels shortage, but also has caused critical environmental pollution problems.Recently, a great number of researchers and scholars have paid more and moreattention to a widely used renewable energy in both production and daily life-solarenergy resource, which is one of the best alternatives to fossil fuel for its tremendousreserves, widely distributed, renewable and non-polluting advantages. At present,building energy consumption is the "huge consumer" among the regular energies,while solar energy air conditioning system plays an important role in relieving thesummer electricity tension and in optimizing energy structure for its good seasonmatch and environment friendliness. What’s more, the application of solar energyair conditioning system will alleviate environment pollution and reduce the fossilenergies consumption, which has importance strategic significance. Even thoughsolar energy is quite abundant in most areas of Yunnan province, solar air conditioneris still in blank applying stage in the areas where summer is hotter or winter is colderthan others in Yunnan province. On the basis of the current situation, the developmentof a solar air conditioning system in Yunnan region will have a great significance andbroad application prospects. In this paper, absorption cooling system, which driven byparabolic trough concentrating collector and adopts hot water single-effect lithiumbromide absorption chiller, has been analyzed from theoretical and experimentalaspects. The main works of the research were summarized as follows:1. Based on the weather condition in Kunming and palisade structureparameters, to simulate and calculate the cooling&heating load of a conference room.The maximum cooling load of air conditioning is92.99W/m2in summer, and themaximum heating load is64.72W/m2in winter.2. Carry out researching works on collectors and absorption air conditioningunits matching parameters, as well as select equipment for solar air conditioningsystems. Choose hot water single-effect lithium bromide absorption chiller with thecorresponding power in accordance with the simulation results of cooling and heatingload. Calculate the area of parabolic trough concentrating collector combined with cooling efficiency of air conditioning units. The system mainly consists of23kWsingle-effect lithium bromide absorption air conditioning unit and a60m2troughconcentrating collector.3. Introduce the working principles of solar parabolic trough concentratingsystem and hot water single-effect lithium bromide absorption air conditioningparabolic trough type concentrating collector, respectively. At the same time carry outthe theoretical researching works on thermal performance.4. Study on the solar absorption air conditioning system experimentally underthe climate conditions in Kunming. The results showed that, for the solar parabolictrough concentrating system, the mean heat loss coefficient is about90W/(m·s), heatcollecting efficiency is0.285, and the instantaneous efficiency is15.6-23.5kW.Moreover when it is under the cooling mode and heat water’s temperature is75-90℃,the average cooling efficiency of the air conditioning system is0.445, the highestcooling efficiency is0.5, and the efficiency is0.923when it is in heating mode.5. Optimize and design the solar absorption air conditioning system, and thenput forward some improvement measures.