Thermodynamic Modelling and Performance Assessment of a Solar Driven Ammonia Water Absorption Chiller
Abstract
A thermodynamic modelling of an ammonia-water absorption chiller has been carried out using the EES (engineering equation solver) environment. The equations governing the thermal and mass transfers in the different chiller components and internal piping have been solved. The model calculates the properties of the binary solution (ammonia-water) at all the state points of the single-effect absorption chiller. The model evaluates the global performance of the system and calculates the amounts of heat absorbed or released by the chiller’s components as well as the total performance coefficient COP. The model has been coupled to TRNSYS (Transient system simulation program) and simulations have been carried out to evaluate the performance of a solar-driven ammonia-water absorption chiller for an office building. The simulation results have shown that such system can reach a COP as high as 0,45. The major results of this study have been published in . In this paper, the absorption chiller model will be explained and the effects of the variation of the machine’s parameters on its performance will be studied. We will also study the possibility of application of the solar-driven absorption chiller in building air conditioning by introducing the results found by our model in a series of dynamic simulations on TRNSYS. Key-words: Absorption chiller, solar cooling, single-effect chiller, ammonia-water, modelling, simulation.