STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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chiller into account, the flow rate is found to be 35 gpm at a temperature of 225°F. The analysis was completed for each loop and the design flow rate and temperatures are shown below. Table 8. Design Temperatures and Flow Rates for each Loop. Loop Absorption Chiller HX1 Sensible Heat Loop Main Loop Intermittent Loop Piping Network Design Flow rate (gpm) 35 130 30 25 Operating Supply Temperature (F) 225 400 300 225 Design Return Temperature (F) 90 225 225 90 After the flow rates have been determined, the piping network and layout can be developed. This piping system is shown in Figure 38 and shows the general locations of the hot fluid supply piping (red) and fluid return piping (blue) with the minimum amount of thermostatically controlled valves for each section. These control valves are shown on the picture as a circle around the pipe. All piping shown is 2 inch standard schedule 40 seamless steel piping and should be welded together as recommended by the heat transfer fluid manufacturers [57]. The figure also shows the recommended design components based on the design parameters provided by the thermal heating fluid manufacturers including a thermal expansion tank bypass with a vent to minimize the risk of system pressurization and pump cavitation. This expansion tank will reduce difficulties in start-up and contribute to the system reliability. The system also consists of two thermal storage tanks consisting of phase change materials to store energy and transfer for current or later uses. 99

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