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Heat‐pump‐assisted dryer part 1: Mathematical model
Author(s) -
Pendyala V. R.,
S. Devotta,
V. S. Patwardhan
Publication year - 1990
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440140502
Subject(s) - heat pump , evaporator , polytropic process , gas compressor , heat exchanger , heat transfer , mechanics , thermodynamics , superheating , hybrid heat , air source heat pumps , mechanical engineering , suction , engineering , physics
A mathematical model for an integrated heat‐pump‐assisted dryer has been developed. The dryer has been modelled considering the heat transfer and simultaneous heat and mass transfer zones. The heat‐pump heat exchangers have been modelled by writing the enthalpy balance for differential lengths considering the various zones on the air and working‐fluid sides. The compressor has been described by the polytropic compression equation. The model has been used for simulating an existing system using R11 to study the effect of approach velocity of air to the evaporator and of the suction superheat on the specific energy consumption of the heat pump assisted dryer.