This study describes the fan performances such as the P-Q curve and the maximum flow rate at various environmental conditions where the cooling fan is installed. Especially, this paper focuses on the relationship between the fan performance and the configuration factors such as the electronic enclosure. At the experiments, it was observed that the pressure difference was increased in the enclosure by the effects of a wall. On the other hand, the flow rate by the fan supply was decreased by the existence of the narrow inlet. When an inlet area of the enclosure became smaller than double of the fan flow area, the flow rate was decreased. In addition, it was observed that the maximum flow rate depended on the opening area ratio. Finally, a model for predicting pressure rise and flow rates which was occurred in the enclosure was proposed. In addition, the thermal analysis for the PCB model set in the enclosure is carried out using the proposed prediction model.

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Experiments were conducted to verify whether an Oscillating Heat Pipe (OHP) with reservoir works as a temperature controllable thermal control device in space. We set the reservoir in 3 ways (vertical, horizontal, and vertically inverted directions) and confirmed that the OHP operates as a variable conductance heat pipe in each case. We also put the OHP vertically and confirmed that the OHP works even in the “top heat mode”. It is concluded that the OHP does not lose its temperature control function of reservoir and heat transfer function of OHP by gravity.

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