Experimental studies on bubble pump operated diffusion absorption machine based on light hydrocarbons for solar cooling

Low-source-temperature diffusion absorption refrigeration. Part II: Experiments and model assessment

“…The refrigeration system achieved stable performance at target operating conditions. Elevated cooling temperature COP was comparable to that reported for another passive low-sourcetemperature DAR system reported in the literature (Ben Ezzine et al, 2010). The present investigation highlighted a number of pathways to improve system performance.…”

“…In the accompanying paper (Rattner and Garimella, 2015b), fully passive low-sourcetemperature (T source ≤ 130°C) diffusion absorption refrigeration (DAR) at T cool ˆ 5°C was identified to have considerable potential for a wide range of applications, such as solar-thermalenergy driven vaccine preservation in developing countries and off-grid refrigeration using engine waste heat. Some experimental low-source-temperature DAR systems have been demonstrated (Ben Ezzine et al, 2010;Jakob et al, 2008;Wang, 2012). However, most have required forced liquid flow for absorber and condenser cooling, employed mechanically pumped internal fluid circulation, or operated at elevated evaporator temperatures that are not suitable for refrigeration.…”

Detailed thermodynamic analysis of a diffusion-absorption refrigeration cycle

“…Ben Ezzine et al [17] reported that the R124eDMAC mixture could yield higher COP at lower driving heat temperatures in comparison with the NH 3 eH 2 O system. They also experimentally investigated a DAR using C 4 H 10 eC 9 H 20 as working fluid in association with helium [18], and demonstrated the feasibility of solar cooling with this system.…”

Experimental investigations on the pumping performance of bubble pumps with organic solutions

“…Compared with ammonia/ water/hydrogen system, it was found lower COP, higher evaporator temperature and lower condenser temperature for all systems. Ben Ezzine et al [20] experimentally studied a bubble pump with a binary light hydrocarbon mixture (C 4 H 10 /C 9 H 20 ) as working fluids to be used in a solar driven diffusion absorption cooling machine for air-conditioning.…”