| With the continual improvement in people's living standard, demands to living environment are much higher, however, the traditional refrigerant-Freon, generates increasingly serious damage to the ozone layer, so ammonia refrigeration has become the research focus.The goal of this paper is:we take the research on Ammonia-water Desorption and Absorption Compression Refrigeration Cycle (ADAR Cycle) based on the theoretical analysis of ammonia refrigeration;designed and established an experiment prototype;take the key technologies experiments of ADAR Cycle;then we verify the feasibility of this refrigeration method through the whole machine test.The contents of this paper:done the rise film experiment of Ammonia-water in the normal pressure and the climbing film technology be applied to the generator. Two different test programs, isothermal-variable pressure and constant pressure-variable temperature, are conducted with the ammonia under low temperature-low pressure, then these unite refrigerating capacities generated from the two programs will be compared,so that we can confirm the feasible and efficient programs in the future refrigeration cycle system.Also, the throttle experiment is carried on with ammonia under high temperature and high pressure, which lays the foundation for the successful operation of the refrigeration system.Finally, ammonia absorber, low pressure generator, ammonia condenser, oil separator and gas-liquid separator are designed and manufactured, at the same time the whole machine test for this system is conducted and a large amount of test data are accumulated.Through a series of experiments, we find that:in the state of 1.1 Mpa and 40℃, ammonia locates the throttle positive effect, and the decreasing pressure and temperature can be acheived through throttling process.Under the same initial pressure, the higher the initial temperature of ammonia, the higher the pressure and the temperature after the throttling.While, with the higher initial pressure, the lower throttling temperature with the same initial temperature and the pressure after throttling. the higher temperature difference has the better effect of climbing film because ammonia can be fromed stable climbing film in the metal wire mesh under normal pressure.Moreover, the unite refrigerating capacity produced by ammonia is 1242 kJ/ kg under isothermal-variable pressure, while the capacity is 1442 kJ/kg under constant pressure-variable temperature, therefore, the effect is better under constant pressure-variable temperature respectively. Take the overall Performance test find:although the COP is lower,with optimization measures will have great prospect.The research of this paper provided a lot of data for future product, and it is very significant. |
