Free-Convection Heat Transfer in Screened Greenhouses |
| |
| Institution: | 1. Department of Physics, Évora University, Colégio Luis António Verney, Rua Romão Ramalho 59, 7000, Évora, Portugal;2. IMAG-DLO, Mansholtlaan 10-12 Postbus 43, 6700 AA, Wageningen, The Netherlands;3. Department of Agricultural Engineering and Physics, Wageningen Agricultural University, Bomenweg 4, 6703 HD, Wageningen, The Netherlands;1. Department of Chemical Engineering, Indian Institute of Technology Guwahati, Assam 781039, India;2. Isotope Production and Applications Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;1. State Key laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. Institute of Structural Engineering, Zhejiang University, Hangzhou, PR China;4. School of Marine Science and Engineering, University of Plymouth, PL4 8AA, UK;5. School of Civil Engineering, University of Birmingham, B15 2TT, UK |
| |
| Abstract: | Free-convection heat transfer between heating pipes and air, horizontal screen and air and inner roof surface and air was studied experimentally in twin-span glasshouses, under constant heat flux conditions. Among other results, equation coefficients between Nusselt and Rayleigh numbers are presented for the inner surface of the greenhouse roof, screen surfaces and heating pipes. Special attention is given to the influence of the location of the heating pipes relative to the screen, as well as the presence of a crop, upon the convective heat transfer between different surfaces and air. The equation coefficients obtained in this work are between 2 and 75% greater than the equivalent equation coefficients found for smooth plates and cylinders by other authors. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
