Transcritical carbon dioxide microchannel heat pump water heaters: Part I – validated component simulation modules / Christopher Goodman in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011)  

Transcritical carbon dioxide microchannel heat pump water heaters: Part I – validated component simulation modules = Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique: Partie I – Modules de simulation des composants validés [texte imprimé] / Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 859-869.
Génie Mécanique
Langues : Anglais (eng)
in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 859-869

Mots-clés :	Gas cooler Microchannel Heat pump Transcritical cycle CO2
Index. décimale :	621.5 Energie pneumatique. Machinerie et outils. Réfrigération
Résumé :	An experimental and analytical study on the performance of carbon dioxide heat pumps for water heating was conducted. The performance of compact, microchannel, water-coupled gas coolers, evaporator, and suction line heat exchanger (SLHX) were evaluated in an experimental facility. Analytical heat exchanger models accounting for the flow orientation and changing CO2 thermophysical properties were developed and validated with data. Heat transfer coefficients were predicted with correlations available in the literature and local heat duty calculated using the effectiveness-NTU approach. The gas cooler, evaporator, and SLHX models predicted measured heat duties with an absolute average error of 5.5%, 1.3%, and 3.9%, respectively. Compressor isentropic and volumetric efficiency values were found to range from 56% to 67% and 62%–82%, respectively. Empirical models for compressor efficiency and power were developed from the data. The resulting component models are implemented in a system model in a companion paper (Part II).
DEWEY :	621.5
ISSN :	0140-7007
En ligne :	http://www.sciencedirect.com/science/article/pii/S0140700710002768