Heat exchangers thermal design

R. K. Shah, Nonuniform Heat Transfer Coefficients for Heat Exchanger Thermal Design, in Aerospace Heat Exchanger Technology 1993, R. K. Shah and A. Hashemi (eds.), pp. 417-445, Elsevier Science, Amsterdam, 1993. 

Kakac, S., Bergles, A. E. and Mayinger, F. (eds) Heat Exchangers, thermal-hydraulic fundamentals and design (Hemisphere, 1981). 

Thermal energy of HHP depends on thermodynamic, thermalphysic and chemical properties of metal hydride, and also from the resulted characteristics of hydride beds in a design a sorber (reactor)-heat exchanger. At designing HHP it is... 

S. Kakac, A.E. Bergles, and F. Mayinger (Eds.), Heat Exchangers Thermal-Hydraulic Fundamentals and Design, Hemisphere, New York, 1981. 

R. K. Shah and M. S. Bhatti, Assessment of Correlations for Single-Phase Heat Exchangers, in Two-Phase Flow Heat Exchangers Thermal Hydraulic Fundamentals and Design, S. Kaka(, A. E. Bergles, and E. O. Fernandes (eds.), pp. 81-122, Kluwer Academic Publishers, Dordrecht, Netherlands, 1988. 

Hewitt, G. E, ed. 2008. HEDH Heat Exchanger Design Handbook, rev. ed. New York Begell House. This five-volume set is divided into broad topical areas theory, fluid mechanics, and heat transfer, thermal and hydraulic design of heat exchangers, mechanical design of heat exchangers, and physical properties. This last section is particularly data-focused. 

Basic Thermal Design Methods for Heat Exchangers... 

Effect of Uncertainties in Thermal Design Parameters. The parameters that are used ia the basic siting calculations of a heat exchanger iaclude heat-transfer coefficients tube dimensions, eg, tube diameter and wall thickness and physical properties, eg, thermal conductivity, density, viscosity, and specific heat. Nominal or mean values of these parameters are used ia the basic siting calculations. In reaUty, there are uncertainties ia these nominal values. For example, heat-transfer correlations from which one computes convective heat-transfer coefficients have data spreads around the mean values. Because heat-transfer tubes caimot be produced ia precise dimensions, tube wall thickness varies over a range of the mean value. In addition, the thermal conductivity of tube wall material cannot be measured exactiy, a dding to the uncertainty ia the design and performance calculations. 

If a heat exchanger is sized usiag the mean values of the design parameters, then the probabiUty, or the confidence level, of the exchanger to meet its design thermal duty is only 50%. Therefore, in order to increase the confidence level of the design, a proper uncertainty analysis must be performed for all principal design parameters. 

Entrance andExit SpanXireas. The thermal design methods presented assume that the temperature of the sheUside fluid at the entrance end of aU tubes is uniform and the same as the inlet temperature, except for cross-flow heat exchangers. This phenomenon results from the one-dimensional analysis method used in the development of the design equations. In reaUty, the temperature of the sheUside fluid away from the bundle entrance is different from the inlet temperature because heat transfer takes place between the sheUside and tubeside fluids, as the sheUside fluid flows over the tubes to reach the region away from the bundle entrance in the entrance span of the tube bundle. A similar effect takes place in the exit span of the tube bundle (12). 

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