heat recovery from R744 based refrigeration system

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heat recovery from R744 based refrigeration system ( heat-recovery-from-r744-based-refrigeration-system )

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Table 1 Comparative results from previous experimental studies Gas cooler & evaporator configuration Operating conditions (Water temperatures ) for tap water heating Space heating conditions Evaporation temperature Nominal heating capacity COP Year Peter Nekså (One Hex as gas cooler) Coaxial HExs 8-60 oC 0 oC 50 kW 4.2 1998 Jørn stene (3 Hexs as gas cooler) Counter flow, tube in tube HExs 6.5-60/70/80 oC 33/28, 35/30, 40/35 oC -5 oC 6.5 kW 3.9 for 60 oC and 80% DHW capacity ratio 2005 Fornasieri (One heat exchanger) Double wall plate Hex 14.7 to 60.2 oC 1.8 oC 20 kW 3.8 2010 KTH (2 HExs in series) Plate HExs 15-60 oC 0 oC 30 kW 3.8/4.3a 2010 a. COP from direct reading/COP from indirect reading With the heat pump facility at energy department of KTH, on average optimum COP value of about 4 was achievable. So, it can be concluded that the system performance is quite comparable with other quoted results. 38

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