TY  - JOUR
EP  - 1021
SN  - 09601481
PB  - Elsevier Ltd
TI  - Influence of canopy condensate film on the performance of solar chimney power plant
SP  - 1012
N1  - cited By 15
AV  - none
VL  - 136
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060924909&doi=10.1016%2fj.renene.2019.01.067&partnerID=40&md5=34cf2d8798e262f8e864d02cefb99c94
A1  - Al-Kayeim, H.H.
A1  - Aurybi, M.A.
A1  - Gilani, S.I.U.
JF  - Renewable Energy
Y1  - 2019///
KW  - Chimneys; Energy conversion; Solar radiation; Water vapor
KW  -  Canopy condensate; Condensate films; Conversion process; Experimental investigations; Presence of water; Radiation transmittances; Solar chimney power plant; Solar updraft
KW  -  Solar chimneys
KW  -  air temperature; condensate; equipment; experimental study; heat source; numerical model; performance assessment; power plant; solar power; solar radiation; temperature effect; water vapor
ID  - scholars11572
N2  - Presence of dust and/or condensate film affects the transmissivity of solar radiation through the transparent canopy/cover of solar collectors. This paper presents experimental investigation results of water vapor film condensate on the upper and lower surfaces of the canopy and how it affects solar chimney performance. The experimental measurements were carried out utilizing the solar chimney model, which has a collector of 7.0 m diameter and chimney of 6.5 m height above the collector. After 10 days of measurements and observation, radiation transmittance was considerably reduced from 7:30 a.m. until 10:30 a.m. due to the presence of condensate. Consequently, collector and solar chimney performance were influenced. A 9â??10 variation in solar radiation transmittance was found between dry and wet canopy. The condensate film required 2.0â??3.0 h to evaporate. During the evaporation time (7:30 a.m. to 10:30 a.m.), the increase in the collector air temperature under wet canopy was 3.0 °Câ??5.0 °C less compared with that under dry canopy. Solar radiation from the sun until 10:30 a.m. was absorbed by the condensate film to evaporate. A delay was observed in the energy conversion processes from solar to thermal to kinetic, thereby delaying power generation. The presence of water condensate film reduced the hydrothermal performance of the solar chimney by two ways: by reducing the transmittance of solar radiation and by absorbing solar radiation from the water vapor particles to evaporate. An auxiliary heat source that supplies heat before sunrise is necessary to evaporate the condensate film and allow the solar chimney to operate early. © 2019
ER  -