EXERGOECONOMIC ANALYSIS ON ENHANCED HEAT TRANSFER SURFACES AT LOW TEMPERATURE

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3500-3502
Author(s):  
DENG-FANG RUAN ◽  
YOU-RONG LI ◽  
SHUANG-YING WU ◽  
BO LAN
Keyword(s):  
Heat Transfer ◽  
Performance Evaluation ◽  
Low Temperature ◽  
Evaluation Criteria ◽  
Enhanced Heat Transfer ◽  
Second Law Analysis ◽  
Augmentation Techniques ◽  
Transfer Cost ◽  
Exergoeconomic Analysis ◽  
New Criterion

The exergoeconomic analysis is carried out on enhanced heat transfer surfaces at low temperature. A new criterion for evaluating the performance of enhanced heat transfer surfaces at low temperature is proposed. It can be applied to various augmentation techniques and generalizes the performance evaluation criteria obtained by means of the first and second law analysis. The validity of the new performance evaluation criterion is illustrated by the analysis of heat transfer characteristics at low temperature and assessment of the heat transfer cost of two types of enhanced heat transfer surfaces.

Exergy Transfer Criteria on Enhanced Heat Transfer Performance Evaluation

2006 ◽  
Author(s):  
Shuang-Ying Wu ◽  
Yan Chen ◽  
You-Rong Li ◽  
Wen-Zhi Cui ◽  
Liao Quan
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Performance Evaluation ◽  
Wall Temperature ◽  
Evaluation Criteria ◽  
Constant Heat Flux ◽  
Transfer Performance ◽  
Enhanced Heat Transfer ◽  
Constant Wall Temperature ◽  
Exergy Transfer

Based on the exergy transfer performance analysis of forced convective heat transfer through a tube with constant heat flux/ constant wall temperature for thermally and hydrodynamic fully developed turbulent flow, extended performance evaluation criteria for enhanced heat transfer surfaces based on the exergy transfer theorem have been developed. An exergy transfer performance evaluation criterion ΔNue or ΔE, which is defined as the difference of exergy-transfer Nusselt number or exergy transfer rate before and after enhanced heat transfer, is put forward. By reference to spirally grooved tube, the effect of Reynolds number, structure parameters of tube, dimensionless wall temperature difference and heat flux on the exergy transfer process is discussed. The results show that the exergy transfer performance of enhanced heat transfer with constant wall temperature is quite different from that with constant wall heat flux. An effective approach for exergy transfer performance evaluation and the optimal process parameters and configuration choice of enhanced heat transfer tube are provided.

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