Theoretical and Experimental Investigation of Hoar-Frost Generation and Thaw Off Process on a Compact Energy-Absorber

Economic feasibility of wind convectors as heat pump evaporators

“…before defrosting). Bradke, Krumm and Fett (1987) state that, for energy absorbers based on flat plates, a deterioration in performance of between 0 and 16% occurs during the first 2 h of operation, but for the remaining 24 h heat transfer performance remains fairly steady. Chung and Algren (1959) report that, for heat transfer to cooled circular tubes, a deterioration of about 10% was evident during the first 60 to 100 min of testing, but, for the remainder of a 3 h period, heat transfer remained steady.…”

“…Previous research work on wind convectors is confined to a few researchers including Marchio and Greider (Marchio et af., 19851, Nilsson (Nilsson, 1986), Moller and Monrad (Moller et al, 1987), Bradke, Krumm and Fett (Bradke et al, 1987). Monaghan convector research project, the following has already been achieved: (a) four different brine-based wind convectors have been extensively tested; (b) a new direct expansion wind evaporator has been designed; (c) computer simulation programs for wind convector heat transfer with and without frosting have been developed and (d) initial field tests of a prototype commercial-scale heat pump with a wind evaporator have been completed.…”