Heat Transfer Handbook part 90. The Heat Transfer Handbook provides succinct hard data, formulas, and specifications for the critical aspects of heat transfer, offering a reliable, hands-on resource for solving day-to-day issues across a variety of applications. | PLATE AND FRAME HEAT EXCHANGER 885 where jh is a heat transfer parameter and ro jh ChRe h where Ch and y have been determined by Kumar 1984 . Both of fliese values are listed in Table as a function of the chevron angle P and the Reynolds number. Thus jhkPr1 3 0 17 h jn------v---- de The channel pressure loss is the sum of the friction loss A pch and the port pressure loss Apport which accounts for the entrance and exit losses AP Apch Apport In eq. 4fchNpLpG2 AP h 4 1W6 where Np is the number of passes Lp is indicated in Fig. and where K fa p Rez TABLE Kumar s 1984 Constants for Single-Phase Heat Transfer and Pressure Loss in Plate and Frame Heat Exchangers Chevron Angle deg Reynolds Number Ch y Reynolds Number kp z 30 10 10 10 10-100 100 45 10 15 10-100 15-300 100 300 50 20 20 20-300 20-300 300 300 60 20 40 20-400 40-400 400 400 65 20 50 20-500 50-500 500 500 Source After Saunders 1988 . 886 HEAT EXCHANGERS According to Kumar 1984 the port pressure loss may be taken as Apport - 2p so that the exchanger pressure loss as required by eq. will be Ap 4 Ch NpLpG2 2pde 0 17 2p The Kumar 1984 constants depend on the chevron angle and the channel Reynolds number. They are displayed in Table . REGENERATORS Introduction The regenerator represents a class of heat exchangers in which heat is alternately stored and removed from a surface. This heat transfer surface is usually referred to as the matrix of flie regenerator. For coniiriuous operation flie matte must be moved into and out of the fixed hot and cold fluid dreams hi tins .
