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Capstone Turbine Corporationn21211 Nordhoff StreetnChatsworthnCA 91311 Application Guide: Hot Water CHP Use with the Capstone MicroTurbine • IPSC-2, double wall stainless steel with 2” ceramic fiber insulation (recommended) • IPSC-4, double wall stainless steel with 4” ceramic fiber insulation Local distributors also sell the appropriate manufacturer hardware to properly connect and seal the ducting components. Many heat exchangers can potentially be used to recover Capstone MicroTurbine exhaust. Unifin International, in particular, supplies an insulated duct that is designed for pre-specified configurations of Model 330s and C60s. Duct Sizing Various factors go into calculating system backpressure, including: • anticipated length of the run; • the diameter of the ducting; • number of bends in the ducting; • type of material used (roughness and friction factors). The Darcy Equation can be used to estimate friction loss as a function of duct diameter, duct length, and exhaust velocity.1 LV () H f = f D + C 4,005 2 where: Hf = head loss due to friction, in H2O f = non-dimensional friction coefficient = 0.2 for clean round metal ducting L = length of duct, ft D = diameter of duct, ft C = dynamic loss constant = 0.16 for each 90° elbow (r/D=1.5), = 0.57 for each backflow damper V = velocity of exhaust, ft/min In practice, however, Figure 2 is commonly used chart for determining friction loss per 100 feet of straight clean round duct. Based on this chart, the MicroTurbines will normally experience backpressure under ISO conditions as follows: MicroTurbine Model 330 C60 friction loss, in H2O per 100 ft 5.0 1.3 1 Mark’s Standard Handbook for Mechanical Engineers, adapted from “ASHRAE Handbook of Fundamentals,” 1981. Applications Guide - Hot Water.doc April 19, 2002 Page 7 of 16PDF Image | Capstone App Guide CHP
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