PDF Publication Title:
Text from PDF Page: 135
The function testing revealed that the one litre LPR was too small, since it was impossible to avoid droplets from the receiver at 7.5 MPa high-side pressure and with the same CO2 charge achieve sufficient liquid feed to the evaporator at 11 MPa high-side pressure. The wet suction reduced the suction gas temperature considerably, while insufficient liquid feed resulted in a lower evaporation temperature and excessive superheating of the suction gas. The receiver was therefore replaced by a 4 litre vessel. 5.1.2 Preliminary Testing The following tasks were performed prior to the experimental period: ♦ Testing and validation of the measuring equipment. ♦ Comprehensive preliminary testing of the CO2 heat pump unit and the secondary systems in order to gain experience with the test rig, the control system and the data acquisition system. ♦ Repeatability testing, i.e. comparison of measurements from inde- pendent experiments carried out under identical operating conditions. ♦ Testing of energy balances, i.e. comparison of the heating capacities of the gas cooler units based on measurements in the secondary (water) circuits and the CO2 circuit. The repeatability tests documented negligible variations in the measure- ment values. The calculated deviation between the gas cooler heating capacities measured in the water circuits and the CO2 circuit is presented and discussed in Section 5.1.3.9. 5.1.3 Experimental Results 5.1.3.1 Introduction With reference to Section 3.2.4.2, Operational Characteristics, the inte- grated CO2 heat pump unit was run in three different modes during the experimental period; space heating only (SH mode), hot water heating only (DHW mode) and simultaneous space heating and hot water heating (combined mode). The compressor was always operated at 6000 rpm (100 Hz), and virtually all tests were carried out at an evaporation temperature of -5oC, since this represents a typical temperature level for a ground- coupled heat pump operating in a cold climate. The heat pump unit gave off heat to a low-temperature floor heating system where the supply 5 – Experimental Results 113PDF 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 (Standard Web Page)