Analytical and Experimental Heat Transfer Studies in a Spiral Plate Heat Exchanger

Operational characteristics of a double-spiral heat exchanger for the catalytic incineration of contaminated air

“…Tangri and Jayaraman (1962) made similar measurements with water in a double spiral with unequally sized channels for Re > 3000 and obtained values exceeding the predicted values for a straight channel by approximately 60%. Buonopane and Troupe (1970) correlated their own data for Nu for water in both sides of a double-spiral heat exchanger at Re from 4000 to 91000 with an expression which differs negligibly from a widely accepted one for straight channels. More recently, Morimoto and Hotta (1986) measured heattransfer coefficients for Re from 2.5 X 103 to 104 in several double-spiral heat exchangers with different radii of curvature and different angular locations of the inlet and outlet at the periphery.…”

Solutions in closed form for a double-spiral heat exchanger

“…The numerical solutions of Strenger et al (1990) predict a maximum in E (and therefore in e) with increasing N and a possible but undetermined finite value of E (and therefore of e) for asymptotically large N. These two important characteristics were not identified in any of the prior experimental and theoretical work, although a plot of the computed values of Buonopane and Troupe (1970) suggests a possible maximum in e beyond the range of their calculations and one of the corresponding curves of Jones et al (1978) appears to go through a maximum. Bes (1987) inferred from numerical solutions for exchangers with both inlets and outlets at the same angular location that e (and therefore E) approaches a maximum value asymptotically as N increases.…”

Multi-objective optimization of a biomass microCHP-ORC system under supercritical conditions

“…The exchanger surface is calculated with the mean Logarithmic Mean Temperature Difference method (LMTD). According to this method, the exchanged heat can be expressed as follows: (60) The logarithmic mean temperature difference can be calculated by: (61) In the case of a counter-flow exchanger, the temperature differences ΔT a and ΔT b are defined:…”