PDF Publication Title:
Text from PDF Page: 046
required is on the order of 2 W/m2 K. The 0.5 kW capacity line shows the reduction in airflow that would be required to maintain the same SHR for a fixed area heat exchanger. In heating mode, the airflow rate is fixed by the comfort constraint and the heat exchanger area required is a function of the pressure and mass flow rate of the refrigerant. Because the temperature difference goes to zero at the pinch points, the area required to accommodate heat transfer in this region accounts for the majority of the overall heat exchanger size. This is illustrated in Figure 4.16 which shows the air and refrigerant temperature profiles for an R744 counterflow gas cooler having 1 kW of capacity, supplying air at 60oC with approach and pinch point temperature differences of 0.2oC. 0.30 0.25 0.20 0.15 0.10 0.05 0.00 Sensible heat ratio = 0.75 Air inlet temperature = 27 C Relative humidity = 50% h=90 W/m 2 K 01234 Indoor coil airside area (m2) Figure 4.15 Controlling air-side capacity in cooling mode by adjusting air flow rate over evaporator coil 100 90 80 70 60 50 40 30 20 Figure 4.16 Temperature profile in gas cooler Refrigerant temperature Interior pinch point Air temperature Approach pinch point 0 2 4 6 8 10 12 Cumulative Air Side Area per kW (sq m) R410A, 1 kW Capacity R744, 1 kW Capacity R410A, 0.5 kW Capacity R744, 0.5 kW Capacity 35 Temperature (C) Air flow rate (kg/s)PDF Image | Comparison of R744 and R410A
PDF Search Title:
Comparison of R744 and R410AOriginal File Name Searched:
CR039.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |