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The heat pumps have the ability to upgrade heat to a value more than twice that of the energy consumed by the device. The potential for application of heat pump is growing and number of industries have been benefited by recovering low grade waste heat by upgrading it and using it in the main process stream. Heat pump applications are most promising when both the heating and cooling capabilities can be used in combination. One such example of this is a plastics factory where chilled water from a heat is used to cool injection-moulding machines whilst the heat output from the heat pump is used to provide factory or office heating. Other examples of heat pump installation include product drying, maintaining dry atmosphere for storage and drying compressed air. Thermocompressor : In many cases, very low pressure steam are reused as water after condensation for lack of any better option of reuse. In many cases it becomes feasible to compress this low pressure steam by very high pressure steam and reuse it as a medium pressure steam. The major energy in steam, is in its latent heat value and thus thermocompressing would give a large improvement in waste heat recovery. The thermocompressor is a simple equipment with a nozzle where HP steam is accelerated into a high velocity fluid. This entrains the LP steam by momentum transfer and then recompresses in a divergent venturi. A figure of thermocompressor is shown in Figure 8.13. It is typically used in evaporators where the boiling steam is recompressed and used as heating steam. 8. Waste Heat Recovery MOTIVE STEAM H.P . Case Example DISCHARGE STEAM M.P . SUCTION STEAM LP Figure 8.13 Thermocompressor Exhaust steam from evaporator in a fruit juice concentrator plant was condensed in a precondenser operation on cooling water upstream of a steam jet vaccum ejector Equipment Suggested Cost of thermocompressor Savings of jacket steam due to recompression of vapour Cost of shell &tube exchanger to preheat boiler feed water Savings in fuel cost Direct Contact Heat Exchanger : Alt-1 Thermocompressor Alt-2 shell &tube exchanger Rs.1.5 Lakhs Rs.5.0 Lakhs per annum Rs.75,000/- ~Rs.4.5 Lakhs per annum Bureau of Energy Efficiency 16PDF Image | WASTE HEAT RECOVERY
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