Experimental investigation of a combined ejector-absorption refrigerator

Abstract

SUMMARYThis paper describes an experimental study of a novel heat-operated refrigeration cycle, 'combined ejector-absorption refrigeration cycle'. In this novel cycle, an ejector was placed between a generator and a condenser of a conventional single-effect absorption refrigerator. The high-pressure vapour refrigerant produced in the generator section was used as the motive fluid for the ejector which entrained low-pressure refrigerant vapour from the evaporator and discharged it to the condenser. This was shown to significantly increase the cooling capacity and COP of the novel refrigerator above that of a conventional absorption unit with little increase in system complexity.

Multidimensional modeling of condensing two-phase ejector flow

“…The authors [12] state that this is an unrealistic assumption, but it has been shown before that the ideal gas model can produce similar results to a real gas model [36]. The CFD calculations of the entrainment ratio, the ratio of the mass flow rate of the secondary fluid to the mass flow rate of the primary fluid, and critical back pressure were close in comparison to experimental results for numerous nozzle geometries and inlet temperatures.…”

A theoretical and experimental study of a novel recompression absorption refrigeration cycle

“…1. In this case, since the ejector is used to enhance the concentration process rather than the evaporation process, as in the combined ejector-absorption cycle found in a previous study [2], this cycle has some unique features which allow it to be driven by high temperature heat sources without the problems found in conventional single-or double-effect absorption cycles. Figure 1 shows a schematic drawing of the novel recompression-absorption cycle.…”

“…2 in the process 2-3 should equal that required to evaporate the refrigerant, m . 8,T , from its solution at the concentrator.…”

Numerical Simulation of Performance of Steam Ejector Influenced by the Distance between Nozzle Outlet and Mixing Chamber Inlet

“…Water vapor was selected as the working fluid of the model and it was treated as the assumption of an ideal-gas. The operating pressure is relatively low for the ejector, this assumption was proved by some researchers [4]. The properties of water vapor are provided in FLUENT database and the density of water vapor is evaluated using the ideal-gas.…”