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D APPENDIX D: TECHNOLOGY SOLUTIONS FOR ENERGY RECOVERY circulates fresh water producing chilled water for either direct cooling of electronic equipment or air conditioning. The hot-side exchanger pulls the heat out of the stack, which can be dumped to the other appropriate heat sinks or used for heating other parts of the system. A thermoacoustic engine can be used to generate sound from heat. By combining two acoustic engines, it is possible to generate cooling from waste heat. Gas turbine exhaust and/or waste heat could power this heat-driven thermoacoustic chiller and then be used to provide supplemental cooling wherever it is needed. B. Thermoelectric Devices The thermoelectric effect operates by the direct application of electrical energy to create a temperature difference across a thermoelectric couple (see figure below). This phenomenon was discovered by Peltier in 1834 and is sometimes referred to as Peltier cooling. The search for better thermoelectric materials continues today. Thermoelectric performance is determined by the material properties figure of merit, a dimensionless number, defined by the equation: ZT = " 2T (1) #! where: α is the Seebeck coefficient, ρ is electrical resistivity, T is absolute temperature, and K is thermal conductivity. Hot side (“Waste Heat”) Cold side Figure D.1: Thermoelectric device principle. Many individual thermoelectric couples can be packaged together into a module arranged so that one side becomes cold and the other becomes hot when a current is applied. The thermoelectric module is, in essence, a solid-state cheat pump with no moving parts. The advantages of such a cooling system are very low noise, low vibration, and adaptability to many configurations. The amount and direction of the current applied across the thermo electric junction control the direction and the magnitude of cooling. 100PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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