PDF Publication Title:
Text from PDF Page: 007
5. Heat pumps mR – refrigerant mass flow rate (kg/s), qc – specific condenser output (kJ/kg). The compressed, superheated refrigerant vapour supplies the condenser with the temperature t2 and the condensation pressure pc. The refrigerant then passes through three stages: 1. Heat dissipation zone – the discharged heat flow is absorbed by the surroundings or by a cooling fluid. In this zone the refrigerant is cooled until it reaches the dew point; the zone accounts for 5-15% of the total heat transfer of the condenser. 2. The condensation zone accounts for around 85-90% of the total heat transfer of the condenser. 3. In the supercoiling zone, the completely condensed refrigerant is super cooled in the temperature of 5°C. Supercooling guarantees that there is no gas before the expansion valve, increases the capacity on the evaporator side and improves the coefficient of the heat pump performance. 5.3.3. Third stage – Isenthalpic throttling p 3 4 h Fig. 5.7. Heat pump throttling in a p-h diagram (Source: own elaboration) Completely condensed refrigerant must be supplied to the evaporator at low pressure. This occurs during an isenthalpic change of state during throttling (Fig. 5.7). ‘Isenthalpic’ means that neither heat nor work is exchanged with the environment. In a real process, entropy increases as the energy is dissipated inside the throttle during the process. A certain proportion of the refrigerant is evaporated during the throttling process. The value of this proportion can be identified from p-h diagrams. They contain lines that show the constant vapour content x in the wet steam area. This basically depends on the evaporation temperature and the supercooling of the refrigerant in the condenser. 151PDF Image | Heat Pumps 978-83-65596-73-4
PDF Search Title:
Heat Pumps 978-83-65596-73-4Original File Name Searched:
Buildings-2020-part2-rozdz5.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)