Heat transfer correlations and NTU number for the longitudinal flow spiral recuperators

Condensation phenomena and frost problems in the air heat recuperators

“…Recuperators' test stand has been shown and described in the paper [2]. Measurement results in cases where the condensation was negligible are given in [ Measurement results of the tested recuperators give combined effect of particular types of condensation and hoarfrost layer creation in recuperator channels.…”

“…The efficiency İ is known and can be estimated [1,2], similar İ CF is known from the measurements; hence the function n (į) can be determined.…”

“…The experiments have been conducted for longitudinal flow spiral recuperators [1,2] for different humidity values ij of removed air in range 20 -75% and more. The stand and experimental procedure are described [2] and used to recuperators tests.…”

Performance of a serpentine heat exchanger: Part I – Effectiveness and heat transfer characteristics

“…Dong et al [8] measured the heat transfer and friction data of flat-tube heat exchangers with wavy fins. Adamski [9] experimentally determined the e-Ntu relation and friction data of a spiral recuperator. Xie et al [10] numerically investigated the heat transfer and fluid flow characteristics of plain fin-and-tube heat exchangers.…”

Heat transfer to immiscible liquid mixtures in a spiral plate heat exchanger

“…Minton (1970) and Martin (1992) proposed correlations for heat transfer coefficients, friction factor and pressure drop, and presented algorithms for designing spiral heat exchangers. Picon-Nunez et al (2007;2009) developed a rapid design methodology for spiral plate heat exchangers on the basis of full utilization of pressure drop and heat utilization. Plate width and plate spacing are determined, and the final exchanger dimensions are then matched to standard dimensions.…”