Page 134 - Defrosting for Air Source Heat Pump
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Investigation of effect on uneven defrosting performance 127
Fig. 5.7 Airside surface conditions of the outdoor coil during defrosting in Case 2 and Case 3
(eight photographs).
It can be seen from Fig. 5.8 that, in Case 1, the tube surface temperatures of the
three circuits remained around 0°C during the first 100 s, and started to rise steadily
thereafter. Temperatures reached 24°C at 172 s, 182 s, and 186 s, respectively [11].It
is demonstrated that the negative effects of downward-flowing melted frost due to
