Nov 14, 2013 · Exhaust gas temperature in coal-fired power plants can reach approximately 120 °C to 140 °C, with the thermal energy accounting for approximately 3% to 8% of the total input energy. Therefore, the heat recovery of exhaust flue gas can improve the thermal efficiency of coal-fired power plants. Currently, the waste heat of flue gas can be recovered by installing an extra heat exchanger, also called low-temperature economizer (LTE), at the end of the boiler flue to heat
Air-to-Water Heat Pump Basics:Most air-to-water heat pumps operate on a vapor compression cycle. This cycle, as it would occur when an air-to-water heat pump operates in heating mode, is shown in Figure 4. Figure 4 Liquid refrigerant at a low temperature passes through a heat exchanger called the evaporator, seen near the top of figure 4. CHAPTER 5 HEATING AND COOLING SYSTEMS20-30 oF to heat indoor air up to 80-100 F. Heat pumps can also be used for water heating:See Chapter 6. Air-to-Air Heat Pumps The most common type of residential heat pump is an "air-to-air" heat pump which uses outdoor air as the heat source. Heat is extracted from the air by an outdoor unit that contains a heat exchanger and fan. The main disadvantage of air-to-air heat pumps is that
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