A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Transcritical carbon dioxide microchannel heat pump water heaters: Part II - System simulation and optimization
This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improve ments of 16 5% for the once through and 4% for the recirculatmg systems. This study can be used to improve the design of microchannel based transcntical CO2 heat pumps, evaluate the impact of varying water inlet temperature desired outlet temperature and evaporation temperature on system performance, and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.
Transcritical carbon dioxide microchannel heat pump water heaters: Part II - System simulation and optimization
This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improve ments of 16 5% for the once through and 4% for the recirculatmg systems. This study can be used to improve the design of microchannel based transcntical CO2 heat pumps, evaluate the impact of varying water inlet temperature desired outlet temperature and evaporation temperature on system performance, and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.
Transcritical carbon dioxide microchannel heat pump water heaters: Part II - System simulation and optimization
Warmwasserbereiter mit transkritischem Kohlendioxid und Mikrokanal-Wärmepumpe: Teil II - Systemsimulation und Systemoptimierung
Goodman, Christopher (author) / Fronk, Brian M. (author) / Garimella, S. (author)
International Journal of Refrigeration ; 34 ; 870-880
2011
11 Seiten, 12 Bilder, 1 Tabelle, 12 Quellen
Article (Journal)
English
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