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Nowadays, in the whole world, energy supply has become tighter, and theenvironmental pollution has become increasingly urgent, meanwhile, thepenetration of the heating system is increasing, and the scale is also growing. Aswe all known, in the entire heating system, the energy consumption of themedium transmission accounts for a large proportion, however, when we choosethe pressure head of circulating pump in design process of heating system, isusually to meet the most unfavorable user’s pressure head, this will result in arich pressure phenomenon in heating users near the heat source, in order toconsume the "rich pressure", we often use throttle valve to deplete the richpressure in vain on normal heating network design, this paper aims to utilize therich pressure through the water injector to achieve energy saving purposes.To improve water injector efficiency in the heating system, this paper havedeveloped four kinds of water injector characteristic curves. Through thecharacteristic curves we determine the operating point of the water injector,which ensures the water injector running in efficient zone.To determine the optimum heat regulation method of the water ejectorheating system, this paper researches on several heat regulation curves, andcalculates energy consumption of the heating circulation pump in the wholeheating period. Through it, conclusion is that phased volume adjustment andquality adjustment is the optimal heat regulation method.As the water injector special working principle, operating water pressure ofthe water injector directly affects its working performance, set the indoortemperature at-1℃~+2℃range of variation to calculate the operating waterpressure range of the water injector, and analysis its influencing factors.Finally, through the example of Harbin Medical University district heatingnetwork, study on energy efficiency and economy of water jet heating systemcomparatively.
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