Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization / Christopher Goodman in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011)  

Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization = Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique : Partie II – Simulation et optimisation du système [texte imprimé] / Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 870-880.
Génie Mécanique
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 870-880

Mots-clés :	Gas cooler Microchannel Heat pump Transcritical Cycle Carbon dioxide
Index. décimale :	621.5 Energie pneumatique. Machinerie et outils. Réfrigération
Résumé :	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 improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical 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.
DEWEY :	621.5
ISSN :	0140-7007
En ligne :	http://www.sciencedirect.com/science/article/pii/S0140700710002756