Experiments are carried out separately under horizontal condensation tube arrangement and vertical condensation tube arrangement to examine energy efficiency ratio of hot-wall refrigerator. Theoretical calculations are made to analyze in-tube condensation heat transfer coefficients of horizontal and vertical tubes under the experimental conditions. The results show that: although the theoretical calculations of the in-tube condensation heat transfer coefficients of horizontal tubes are much higher than that of vertical tubes

but the experiment results indicate that there is a smaller difference on the whole heat transfer performance. Generally speaking

the energy efficiency ratio of horizontal tube arrangement is just about 2% higher

the outside air’s heat resistance plays a main role in hot-wall condenser

and the in-tube heat exchange difference caused by two tube arrangements has a small effect on the general heat transfer performance for hot-wall refrigerator.