PDF Publication Title:
Text from PDF Page: 095
CHAPTER 3: PUMP SIMULATION MODEL 83 3.5 Characterizing of the CO2 System The final step in the process is to characterize the system into two equations in terms of the system's heating capacity and COP. This will enable us to compare the CO2 system with the R-22 system for which a characterization already exists in terms of heating capacity and COP. For the CO2 system to be compared with an R-22 system a reasonable condition had to be chosen at which to run the CO2 system. It was chosen to run the compressor at a constant discharge pressure of 10000kPa, this is possible with the expansion valve implemented in the system, correct refrigerant charge and with a variable speed pump determining the mass flow of the water. A discharge pressure of 1OOOOkPa was chosen because of the following reasons: • The water heating profile will not cross the gliding gas cooler outlet temperatures profile. • It is well within the boundaries within which the polynomials were determined and will give an accurate result. • It is within the running boundaries of the compressor chart and within the capabilities of the compressor chosen. • It is a feasible discharge pressure for inlet weter temperatures of up to 30°C. • It is an optimum running pressure considering COP and heating capacity. • It is a high enough pressure to ensure that a high evaporating temperature will not be higher than the gas cooler outlet temperature which is also connected to a pressure. To characterize the CO2 system, equations for the system in terms of COP and heating capacity had to be determined. The equations also have to be in terms of gas cooler outlet temperatures and evaporating temperatures since these variables will determine at which conditions the system is running and in turn will determine the COP and heating capacity of the system. Therefore it was assumed that for a certain inlet water temperature, the gas cooler outlet temperature must be 5K higher than the inlet water temperature. It is known that the delta temperature between the refrigerant and medium could be lower but 5K is a reasonable and easily achievable delta. The delta temperature is implemented A Techno-Economical Analysis of a CO2 Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
PDF Search Title:
CO2 HEAT PUMP AnalysisOriginal File Name Searched:
co2-heat-pump-techno-analysis.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 |