Heat Recovery Exchanger Sizing
The exchanger is the most costly item for this waste heat recovery project. The manufacturer’s price for the heat exchange equipment can be estimated as shown in Figure 3200-1.
From the Cost Estimating Book, two low pressure exchangers, with 1852 square feet of surface area each, would be about 24 inches in diameter; and the purchase price would be $30,000 each from the manufacturer.
Even for low fuel values, this type of waste heat recovery project could have a payout in less than a year, depending on the fuel savings.