Conference Year
2018
Keywords
booster, ejector, COP, compressor, experiment
Abstract
The decrease of electricity consumption by refrigerators at least by 10% reduces the load on the power plant by 1.5%, which is a very significant magnitude in the scale of the planetary balance. The calculated-theoretical research of new schemes of combined refrigerating machines with booster and compressive ejector stage showed the reduction of energy consumption, depending on the operating mode, from 10 to 40%. The ejector stage is produced for new systems and for operating compression refrigerating machines, while the price of the additional equipment does not exceed 10% of the cost of the compressor. For the experiment, the basic schematic with booster ejector was considered, where the ballast vapor is used as the motive flow, separated after the first throttling to an intermediate pressure. The purpose of the experiment is to determine the exact value of the optimal intermediate pressure, which ensures the maximum energy values of the entire installation. The decrease of the intermediate pressure, on the one hand, leads to an increase of ballast steam rate, but, on the other hand, the motive steam, the pressure and the temperature are decreased. The entrainment ratio is set by the ratio of the vapor consumption from the evaporator to ballast vapor consumption and is determined by the flow parameters after the first throttling. The main parameter in the system is the compressed vapor pressure behind the ejector, which determines the energy and volume parameters of the compressor. As a result of the experiments, all characteristics of the ejector stage, the compressor and the installation as a whole were obtained. The experimental characteristics of the system prove the results of calculations and simulation of the ejector. The effect of the presence of oil on the operation of the ejector was insignificant, about 1-3%. However, the requirements for separating the oil after the compressor remain rigid. The research has shown both high power plant parameters and stable performance characteristics.