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remaining energy. The plate-and-frame heat exchanger is chosen for this application due to its higher liquid-to-liquid heat transfer characteristics as discussed in Chapter 3 This feed-water preheating heat exchanger will be located prior to the location where the recovered condensed water is returned to the feed-water source to insure the maximum amount of energy can be recovered in the system. Fluid Selection, Temperature and Flow Rates Design For the example system developed, the second and third design options discussed in the previous section are selected and a waste heat source was chosen. The flow rate and temperature requirements for the system must then be determined. For the main loop, the maximum temperature required in the system is 285°F by the glue baths. To ensure that the fluid is delivered to the glue baths at a high enough temperature, taking into account the heat losses through the piping network, the temperature is set at 300°F. From this temperature setpoint, the mass flow rate of the main loop can then be calculated using the first law of thermodynamics. The energy available in the system was previously calculated by the energy recovered from the initial heat exchanger and the average densities and specific heats are known. For this loop, DOWTHERM G is used as the thermal fluid, and over the temperature range the average density is 61.2 lbm/ft3 and the specific heat is 0.44 Btu/lbm-°F. The return temperature and flow rate can then be estimated to be 225°F and 30 gpm based on the energy consumption in the process. For the absorption chiller loop the flow rate can be calculated a similar way however the absorption chiller requires a minimum flow rate and temperature to operate effectively. The operating fluid for this loop is chosen to be UCON HTF 500 because of its better low temperature heat storage performance. By taking the thermodynamic analysis and the minimum requirements of the 98PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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