PDF Publication Title:
Text from PDF Page: 044
R1234ze(E) entails a lower VHC than R1234yf, while its COP was higher. Their performance can thus be balanced out at this point. It is evident that the higher the VHC, the smaller compressor can be used to provide similar heating effect. Within the options considered, R32 is the only one resulting in such a possibility 6000 5000 4000 3000 2000 1000 0 25 27 29 31 33 35 37 Condensation temperature [°C] R410A R32 R152a R290 R1270 R1234yf R1234ze(E) Figure 4.3. Volumetric heating capacity vs. condensation temperature (floor heating) The trend and relationships between the different refrigerants observed in the radiator heating case, can be found in the floor heating case as well, represented in Figure 4.3. 4.3. Coefficient of performance (COP) In this section the coefficient of performance for the heat pump application will be considered (COP1 as calculated in equation (3.8)), similarly to the previous case, in relation to the outdoor temperature. The results can be observed in Figure 4.4, in case of radiator heating and in Figure 4.5 in case of floor heating. The general trend of the COP is common to every refrigerant, and consists of its increase with increasing outdoor temperature, thus increased heating capacity. The rates of growth though, are different within the options thus making the identification of their relationships not straightforward. Generally, it can be remarked that R32 outperforms every other substance from outdoor temperature of -17 °C. It reaches the maximum increase compared to R410 at the lowest and highest temperatures of the range, respectively of 8.2% and 7.7%. The divergence is reduced in the central values of the range. It can be observed that below -17 °C, the best performance is offered by R152a. -35- VHC [kJ/m3]PDF Image | Next generation of refrigerants for residential heat pump systems
PDF Search Title:
Next generation of refrigerants for residential heat pump systemsOriginal File Name Searched:
MartinaLonghini_ThesisReport.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 |