Development of the cooling system in cyclotron roof

As 50% of the heat load in a building is transmitted through the roof during summer season for hot climate regions. Solar energy is difficult to be controlled to prevent roof overheating. Several studies were carried out for reducing the heat gain through the roof mainly in tropical or hot countries.In this study, the heat pipes are proposed as a new passive system for cooling the cyclotron roof. This idea has not been used practically before in the field of cooling ceilings of buildings. The heat pipe or two-phase thermosyphon is a device, which is able to conduct very large heat fluxes through small cross sections because heat transfer within the pipe comes from the latent heat of boiling liquid and condensing vapor. Both processes are two-phase flow which has inherently high heat transfer coefficients.The objective of this study is to achieve a thermal moderation inside the buildings by reducing the heat energy transferred through roofs due to the action of incident solar radiation, using the cranked thermosyphons. In this configuration the heat pipe acts as a ”thermal diode”, where energy can be transferred in one direction only from the roof to the surrounding air for cooling purposes in summer and from the surrounding air into the roof through the heat pipe for heating purposes in winter.