Page 298 - Defrosting for Air Source Heat Pump

292 Defrosting for Air Source Heat Pump

Fig. 9.34 Measured fin surface temperature at the center of each circuit of the outdoor coil.

Fig. 9.35 Measured temperatures of compressor suction and discharge during defrosting.

transfer process delay from the refrigerant to the tube, and then to the fins. Second, the
curve of Circuit 3 is not always the lowest in Fig. 9.34, which is different from that
shown in Fig. 9.33. This is because of the disturbing effects of the downward-flowing
melted frost, which will cool the temperature sensors by taking latent heat from them.
As listed in Table 9.9, the fin surface temperature differences at the first five divided