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diameter tubes arranged in a staggered formation. The program is able to calculate an actual heat transfer coefficient for both inside and outside the tubes. This value for each is found to be 6.3 Btu/ft2-hr-F and 14.93 Btu/ft2-hr-F respectively under the design conditions. The heat exchanger is designed to recover the 0.9 MMBtu/hr that is calculated previously and is this accomplished with the previous dimensions and style of heat exchanger with a percent under design of 3.6%. This means that 3.6% of the energy content that is to be recovered will not be absorbed into the heat transfer material or 0.032 MMBtu/hr are still exhausted to the atmosphere. The design performance information for this heat exchanger along with HX1 can be found in the Appendix. After the energy is recovered from the stack it must be transported into the heat storage tanks. To accomplish this heat transfer, a series of piping loops are installed inside the tank that allows the hot fluid to flow through and transfer the energy into the phase change materials which are enclosed inside the tank. This type of heat exchange is chosen because the contents of the thermal storage tank are stationary and heat transfer through a traditional heat exchanger, a plate- and-frame or a shell-in-tube, is virtually impossible. To ensure that the appropriate energy is transferred into the system, a tubular heat transfer analysis can be conducted by knowing thermal properties of the piping materials and the phase change material. For the first heat exchanger loop, a total length of 105 feet must be used to transfer the appropriate amount of energy into the phase change materials. For the second heat exchanger loop, an additional 30 feet must be added. Pumping Selection Once the piping layout and the components of the system are known, the pumps can then be sized. To do this, a head loss analysis was conducted on the system and includes the associated losses from the heat exchanger, piping and valves and fittings. The system will require four 103PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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