Experimental investigation of a high-temperature heat pump for industrial steam production

Evaporating crystallization effect of ammonium sulfate at atmospheric pressure under the action of ultrasound

“…Evaporating crystallization is heated by the steam waste heat of industrial steam with temperatures of 120–140 °C [20] , [21] ; therefore, the temperature of the oil bath pot, which is the heat source, is fixed at 135 °C in our experiment. In each experiment, 75 mL of ammonium sulfate solution was transferred to a 150 mL beaker, and an ultrasonic horn was inserted to ensure that the bottom of the horn was 35 mm below the liquid surface.…”

State of the art of heat pumps for heating above 150 °C

“…Zhang et al [21] analysed the three-stage air-source hybrid heat pump and achieved the best COP of 2.1-1.3 under the temperature lift of 70-151 °C from when air temperature equaled 15 to 30 °C. On the other hand, Liu et al [22] prototyped an experimental 70 kW system for the process steam with a temperature above 150 °C.…”

Research on Thermodynamic Characteristics of the Saturated Flue Gas Waste Heat Recovery to Reduce Turbine Extraction Steam

“…Following the basic law of energy conservation, the sum of the driving heat source and the recovering saturated flue gas waste heat is equal to the medium-grade heat produced in the absorption heat pump . As shown in eq , the COP is used as the key indicator for evaluating operation performance of the absorption heat pump, ,, and the value is the ratio of the medium-grade heat to the high-grade heat. normalC normalO normalP = Q normalm Q normalh = 1 + Q normall Q normalh …”