Study on LiBr-Liquid Desiccant System Driven by Heat Pump

摘要

Humidity is one of the most important factors for human thermal comfort,and the liquid desiccant system is an effective dehumidification mode,especially for solar energy or waste heat acting as the driving heat.The excellent system performance depend on high absorption (or desorption) of water vapour in absorption (or desorption) process within limited temperature range.Therefore,the cooling and heating energy should apply to absorption and desorption process respectively since the latent heat of water vapour transferred between air and liquid desiccant solution.However,in a real system,cooling and heating energy are always independent and matching imperfectly; and for a specific working solution such as lithium bromide solution,the regenerative temperature is higher for traditional heating source,as a result,the whole system performance is lower.In this study,heat pump is applied in a liquid desiccant system as the cooling and heating energy which is used thoroughly,and an auxiliary heat source is added to fetch up the unbalanced energy.Moreover,lithium bromide is acted as the working solution and is focused on experimentally test.Furthermore,different operating conditions including air temperature,air humidity,air flow,in absorber and in generator et al are measured in the experiment test.Consequently,the experimental results is given and analysed.