Numerical study of wind effects on combined convective heat loss from an upward-facing cylindrical cavity

Solar Energy ◽  
2016 ◽  
Vol 132 ◽  
pp. 294-309 ◽  
Author(s):  
Zu-Guo Shen ◽  
Shuang-Ying Wu ◽  
Lan Xiao
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Cylindrical Cavity ◽  
Numerical Study ◽  
Wind Effects ◽  
Convective Heat Loss

scholarly journals Numerical study of Flow patterns and performance of a coupled cavity-dish system under different focal lengths

2021 ◽  
Author(s):  
Muhammad Uzair ◽  
Mubashir Ali Siddiqui ◽  
Usman Allauddin
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Numerical Study ◽  
Focal Length ◽  
Heat Losses ◽  
Operating Conditions ◽  
Convective Heat Loss ◽  
Parabolic Dish ◽  
And Performance ◽  
Coupled Cavity

The effectiveness of the parabolic dish system (PDS) is greatly affected by the heat losses associated with high temperatures. The complexity of flow and temperature patterns in and around the cavity receiver makes it a challenging task to determine the convective heat loss from the cavity. Various studies have been carried out to determine the convection heat losses from isolated cavities of different shapes. In the presence of dish structure, the free stream wind may affect the stability of structure and the heat losses from the PDS. In this study, effect of focal length on the performance of the coupled cavity-dish system was analyzed using numerical simulations. The loading and the convective heat loss from the cavity were examined with three different cavity positions and different operating conditions in the presence of the dish. The results showed that the shallow dish experienced higher local air velocities near the cavity receiver than in the case of the deep dish. It was concluded that the heat loss is a stronger function of tilt angle rather than focal length, and in essence, the heat losses due to variation of this are negligible.

An air curtain surrounding the solar tower receiver for effective reduction of convective heat loss

2021 ◽  
pp. 103007
Author(s):  
Qiliang Wang ◽  
Yao Yao ◽  
Mingke Hu ◽  
Jingyu Cao ◽  
Yu Qiu ◽  
...  
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Air Curtain ◽  
Convective Heat Loss ◽  
Effective Reduction

Modeling of convective heat loss from a cavity receiver coupled to a dish concentrator

Solar Energy ◽  
2018 ◽  
Vol 176 ◽  
pp. 496-505 ◽  
Author(s):  
Muhammad Uzair ◽  
Timothy N. Anderson ◽  
Roy J. Nates
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Convective Heat Loss

Assessment of Convective Heat Loss From Humans in Cold Water

1978 ◽  
Vol 100 (1) ◽  
pp. 7-13 ◽  
Author(s):  
L. A. Kuehn
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Cold Water ◽  
Water Immersion ◽  
Physiological Data ◽  
Direct Calorimetry ◽  
Biophysical Models ◽  
Convective Heat Loss ◽  
Different Temperatures ◽  
Body Heat

Convective heat loss is a primary cause of hypothermia in humans undergoing water immersion, particularly for swimmers and divers at relatively shallow depths. Various biophysical models have been advanced to account for body heat loss in water of different temperatures and cold stress, most of which have made use of physiological data obtained with easily applied classical thermometry techniques. Explicit techniques for the determination of body heat loss must involve direct calorimetry or the use of heat flow transducers, techniques which are difficult to apply in realistic simulations of actual cold water exposure. This paper describes these latter two techniques in some detail, concentrating on the accuracy to be attained and the calibration necessitated with each method. Results obtained with each method specific to heat loss determination at surface and both dry and wet hyperbaric exposures are shown, illustrating the types of data that can be attained.

Wind Chill*

1948 ◽  
Vol 29 (10) ◽  
pp. 487-493 ◽  
Author(s):  
Arnold Court
Keyword(s):  
Low Temperature ◽  
Heat Loss ◽  
Convective Heat ◽  
Human Body ◽  
Empirical Formula ◽  
Heat Removal ◽  
The Body ◽  
Total Heat ◽  
Wind Chill ◽  
Convective Heat Loss

The rate of heat removal from the human body by wind and low temperature was termed Wind Chill by Siple and expressed by an empirical formula. This paper discusses the formula critically, pointing out that this measure of the convective heat loss may be less than three-quarters of the total heat lost by the body. Siple's formula is compared with those of others, and the use of the formula is discussed.

scholarly journals Convective heat loss from a bladed solar receiver

2019 ◽  
Author(s):  
Juan F. Torres ◽  
Farzin Ghanadi ◽  
Maziar Arjomandi ◽  
John Pye
Keyword(s):  
Heat Loss ◽  
Convective Heat ◽  
Convective Heat Loss ◽  
Solar Receiver
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