PDF Publication Title:
Text from PDF Page: 301
The calculation of the density and the specific heat capacity of water were based on the average water temperature for each system, i.e. (Tout+Tin)/2. The uncertainty in the temperature measurements was ±0.085°C, and the uncertainty in the volume flow rates was 0.5% of the measured value. Table D2 shows the absolute and relative uncertainty in the total heating capacity of the CO2 heat pump during operation in the three different operating modes, when the compressor was running at 6000 rpm (100 Hz), the set-point for the hot water temperature was 70°C and the supply, and return temperatures in the space heating system were 35/30°C. Table D2 δQ [W] αQ [%] SH=Space heating mode Appendix D – Uncertainty Analysis The absolute and relative uncertainty in the total heating capacity for the CO2 heat pump unit based on measurements from the water circuits. SH ±155 ±2.5 DHW ±65 ±1.0 SH + DHW ±80 ±1.3 SH+DHW=combined mode ) (D7) DHW=hot water heating mode D3.2 CO2 Circuit Measurements The total heating capacity of the CO2 heat pump is: Q =m ⋅(h −h & GC & CO2 CO2−in co2−out where V& is the CO2 mass flow rate [kg/s], and hCO2-in and hCO2-out the specific enthalpy [kJ/kg] of the CO2 at the gas cooler inlet and outlet, respectively. Since the specific enthalpy h of the supercritical gas is a function of the pressure and the temperature, the uncertainty in the specific enthalpy according to Eq. D2 is: ⎡⎛∂h ⎞2 ⎛∂h ⎞2⎤0.5 δh=⎢⎜∂p⋅δp⎟ +⎜∂T⋅δT⎟ ⎥ (D8) The uncertainty in the total heating capacity is: &2 & 2 & 20.5 (D9) δQ=[((h −h)⋅δm)+(m⋅δh)+(m⋅δh)] & 2121 ⎢⎝ ⎠⎝ ⎠⎥ ⎣⎦ D3PDF Image | Residential CO2 Heat Pump System for Combined
PDF Search Title:
Residential CO2 Heat Pump System for CombinedOriginal File Name Searched:
20559406.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 |