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small fraction in portable freezer/refrigerator boxes. These systems provide a comparable performance to mechanical vapour compression at -20 °C temperatures. 12.3.3.4 Vuilleumier heat pump: Development status: emerging Vuilleumier heat pumps are similar to Duplex Stirling engine heat pumps, but utilise two pistons instead of one piston. This emerging technology is reported to have a COP for heating of 1.6 to 2.2 and a COP for cooling of 0.8 to 1.2. The technology that is claimed can provide an energy saving of 26 % for heating over baseline MVC (Munters, 2009; Xie et al., 2008). 12.3.3.5 Ejector heat pump: Development Status: commercially available 244 2018 TOC Refrigeration, A/C and Heat Pumps Assessment ReportPDF Image | Heat Pumps Technical Options
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