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Cooling – Heat pipe heat exchanger pre-cools the building makeup air in the summer and thus reduces the total tonnes of refrigeration, apart from the operational saving of the cooling system. Thermal energy is recovered from the cool exhaust and transferred to the hot supply makeup air. Heating –The above process is reversed during winter to preheat the makeup air. Following are other applications of heat pipes in industry: Preheating of boiler combustion air Recovery of waste heat from furnaces Reheating of fresh air for hot air driers Recovery of waste heat from catalytic deodorizing equipment Reuse of furnace waste heat as heat source for other oven Cooling of closed rooms with outside air Preheating of boiler feed water with waste heat recovery from flue gases in the heat pipe economizers. Drying, curing, and baking ovens Waste steam reclamation Brick kilns (secondary recovery) Reverberatory furnaces (secondary recovery) Heating, ventilating, and air-conditioning systems Economizers An economizer can be used with a boiler system to pre-heat the boiler feedwater with the flue gas heat or, in an air pre-heater, to pre-heat the combustion air. In both the cases, there is a corresponding reduction in the fuel requirements of the boiler. For every 428°F (220°C) reduction in flue gas temperature by passing through an economizer or a pre-heater, there is a 1% saving of fuel in the boiler. In other words, for every 140°F (60°C) rise in feedwater temperature through an economizer, or 392°F (200°C) rise in combustion air temperature through an air pre-heater, there is 1% saving of fuel in the boiler. Exhibit A-9: Feedwater Economizer – Typical Unit and Installation on a Boiler Industrial Waste Heat Recovery Page 51PDF Image | Industrial Waste Heat Recovery: Potential
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