Abstract
In order to make clear heat transfer between in and out vinyl houses, sensible heat transfer coefficient at the outer surface of vinyl houses as shown in Figs. 1 and 2 were determined from Eqs. 1 and 2. Heat transfer experiments were made in a wind tunnel and in a open field, respectively. The similarity of heat transfer between a model and an actual vinyl houses was also discussed theoretically.
The results obtained can be summarized as follows:
(1) The similarity law for heat transfer was found to be somewhat different from those obtained for model experiments of wind regime behind wind-shelter (Eqs. 3 and 4). The discrepancy in heat transfer coefficients obtained respectively from the model and the actual vinyl houses increased as the ratio LM/LN (where LM and LN are respectively the representative scales of model and actual houses) increased (see Fig. 3).
(2) Under conditions that the similarity law for wind regime was applied into model experiments and that the scale of vinyl houses is in the range used here, the sensible heat transfer coefficients obtained from both the experiments are in good agreement with each other (Fig. 4). The results indicate that the value of heat transfer coefficient obtained from model experiments in a wind tunnel may be applicable to analysis the heat transfer of vinyl houses.
(3) Fig. 5 indicates that the heat transfer coefficient at the outer surface of vinyl houses is remarkably influenced by the surface portion in relation to wind. The heat transfer coefficient is larger for the foreward surface portion than for the leeward surface portion. Especially, the heat transfer coefficient was the highest at the front surface portion of R1.
