The Technique Of Applying Waste Heat Of Refrigerating System To Distilled Water Machine

It is a key factor for energy-saving to reuse the waste heat generated byrefrigeration system. Distilled water is widely demanded in many fields, The purposeof my research is to use the waste heat of the refrigeration system and to producedistilled water. My research will be very meaningful to social progress anddevelopment.Ejector is the key to the preparation of distilled water, In the paper, three kinds ofejectors were studied, using the FLUENT software to simulate the characteristics ofejector parameters, including the distributions of temperature, pressure, velocity, andcomponents. The simulation results showed that a vacuum formed in the ejector throat.The higher the vacuum degree is formed, the lower boiling point the water will get,and the faster the evaporation speed will be. According to theoretical calculations, theratio between the area of the throat and that of the mixing section can be obtained.Thus, the ratios of the three ejectors are0.0156,0.0532,0.0946. The ejector with theratio0.0156can be used to prepare distilled water. However, the other two ejectorswith the ratios0.0532and0.0946can’t be used in the preparation, because during thetwo processes, inverse suction phenomenon will emerge.Experimental research and analysis, tested and verified the simulation andcalculation results, and proved that the two conclusions are unanimous. And experimental results indicate that, the ejector with the ratio0.0156can get a vacuum degree of0.085MPa, the ejector with the ratio0.0532can get a vacuumdegree of0.032MPa, but then there will be inverse suction, however, the ejector with the ratio of0.0946even cannot get a vacuum, inverse suction emergedright there. All these experiment results keep consistent with the simulation results.Experimental results showed that the outlet temperature trend of the ejector withthe ratio0.0156was upward, the throat temperature trend was slowly rising aftergoing down, while the pressure of the inlet and outlet of the ejector throat showed aslow downward trend; the inlet and outlet temperatures and throat temperature of theejector with the ratio0.0532showed an upward trend, while the ejector’s inlet andoutlet pressures kept almost constant firstly then declined rapidly, In the throat, thepressure showed a downward then rising trend; the inlet and outlet temperatures andthroat temperature of the ejector with the ratio0.0946showed an upward trend after the first drop, while the ejector’s inlet and outlet pressures showed a first increasing,then kept constant and declined rapidly at last.When the vacuum degree of the ejector with the ratio0.0156reached0.07MPa,the pressure drop between the inlet and the throat reached its maximum value,0.69MPa. In the meantime, the amount of produced steam got to the top, which meansthis vacuum degree is optimal. Though the pressure drop of the ejector with the ratio0.0156got its maximum0.114MPa when the vacuum degree was0.025MPa, inversesuction emerged there instantly which made the ejector won’t work. The ejector withthe ratio0.0946didn’t generate a vacuum, so it is not qualified for this research. Insummary, the ejector with the lowest ratio meets the requirements. Also the presentexperiment platform has its inadequacies, some suggestions to improve the platformhave been made.