PDF Publication Title:
Text from PDF Page: 014
Chapter 2: Experimental Results of RAC1 System in Heat Pump Mode 2.1 Comparison of RAC1-R744 and baseline R410A systems The original R744/R410A air conditioning experiments initially used a commercially available R410A A/C-only system as the baseline, because an R410A heat pump system had not yet become commercially available (Beaver et al., 1999). The heat exchangers in the R744 system were designed to match the geometry of the original R410A A/C-only system as closely as practical. As a result, they were not designed to fully capitalize on the properties of R744, nor were they designed for reversible (heating mode) operation. A detailed description of the experimental set-up can be found in Appendix A, while a comparison of the critical components of all three systems is shown in Table 2.1. Importantly, as compared to the R410A combined heat pump -A/C system used as the baseline for this comparison, the R744 system’s outdoor coil has larger face area and refrigerant side area but less air side heat transfer surface. Similarly, its indoor coil has larger refrigerant side area but smaller face area and less air side heat transfer surface area. The baseline system uses a hermetic scroll compressor. The R744 system uses a prototype semi-hermetic reciprocating compressor manufactured by Dorin. The compressor motor is rated at 3 kW at 380V/50 Hz, and the displacement of the compressor is rated at 2.7 m3/h at 1450 rpm. This is a different compressor than the open compressor used by Beaver et al. (1999a). The R744 compressor is controlled by a variable frequency drive so that the capacity can be adjusted. Three manual expansion valves, one for each slab on the outdoor coil, are used so that distribution between the slabs can be controlled. A suction line heat exchanger is used in the R744 system to obtain refrigerant- and cycle-specific performance improvements that are not available with R410A (Boewe et al., 1999). 3PDF 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 |