The Research On Building Outsude Surface Convective Heat Transfer Measurement Using Naphthalene Sublimation

With the development of economy, energy problem is becoming more and more important. Building energy exhaust takes bigger proportion in the total energy exhaust with more heating and air condition equipments used, so counting the building heat load exactly takes more important role to buildings'desigh. Outside convective heat transfer counting, especially outside convective heat transfer coefficient which is the most important factor to convective heat transfer, uses the experience value in the wind tunnel experiment, which must brings warp in counting energy exhaust.The paper gives out the experiment method researching outside convective heat transfer characteristic using naphthalene sublimation experiment, sums up the experiment theory, experiment scheme, measurement method and so on. The paper gives out the integrated experiment scheme fit for outdoor actual measurement when it overcomes the difficulties in the outdoor naphthalene sublimation experiment. We validate naphthalene sublimation experiment method's accuracy by comparing the results of eddy correlation method and naphthalene sublimation experiment. Then we analyze the effect of climate factors to outside convective heat transfer coefficient and get the new calculating formula of vertical surface and horizontal surface based on the outdoor actual measurement on the HIT teaching building's roof and students'rooming house. The paper does research on convectional heat exchanging characteristic of a building in Guangzhou by using energy exhaust analysis and environment assessment software AUSSSM. It is analyzed that the changing of convectional heat exchanging and effect to the heat environment of heat extraction change of the air condition. The paper analyses the difference and the reason compared with the conditional method, and gives out the dada analysis method fit to the practical situation.The paper gives out the method of analyzing buildings'outside surface convective heat exactly, plays instructional role in buildings'energy exhaust and outside heat environment assessment, and supplies scientific data to air condition system design.