| The open-cycle absorption refrigeration system has many advantages, such as saving energy and environment protection etc. Open-generator and dehumidifier are all the important parts of open-cycle absorption. The regeneration and dehumidification process, which involve simultaneous heat and mass transfer, are complex. The performance of regeneration and dehumidification process greatly influences the overall system performance. In this paper, on the basic of the result of open-cycle solar energy absorption cooling/heat pump system driven by hot air, the performances of open-generator which runs under two different system structures and dehumidifier are discussed. For the present study, the packed tower is used for regeneration and dehumidification purposes, employing hot moist air as heat source of open-generator and LiBr solution as working liquid. In order to predict the tower performance, a steady state model which considers the heat and mass transfer resistance of the gas phase and the mass transfer resistance of the liquid phase is developed. And the governing equations of the model are solved on a digital computer. So the effects of variables such as solution concentration and temperature and flow rate, air temperature and humidity and flow rate, and the type and height of the packing on performance of open-generation and dehumidification process are investigated.By researching, it is found that open-generator and dehumidifier can meet the requirement of the open-cycle system. LiBr solution preheated by gas-solution heat exchanger greatly enhances effectiveness of the open-generator. Also, dehumidifier results predicted in this paper show a good agreement with the experimental findings reported in the literature. In addition, based on the results of numerical analysis, the key variables that greatly impact on the performance of open-generator and dehumidifier are found out. The results will supply theoretical fundament for product design and development.
|
PDF Full Text Request