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Capstone Turbine Corporationn21211 Nordhoff StreetnChatsworthnCA 91311 Application Guide: Hot Water CHP Use with the Capstone MicroTurbine microturbines be used only for the purposes listed in CTC’s technical specifications. Under no circumstances should microturbines be used for purposes other than those recommended by CTC, and in no event should microturbine exhaust be used to directly heat spaces. CTC is not liable for any harm or injury that results from uses not recommended by CTC. Condensation and corrosion Using very cold water in heat exchangers can result in condensation. The cold water will be effective in recovering Capstone MicroTurbine exhaust energy to the extent that the final exhaust temperature may drop below dew point. Unifin heat exchangers include drip pans that allow for the safe removal of any condensation. However, should sulfur-laden fuels such as biogas and diesel be used, the exhaust will contain sulfur dioxide (SO2). SO2 combined with water will eventually generation sulfuric acid(H2SO4), and will eventually corrode carbon steel components. Capstone recommends the use of stainless steel in exhaust streams where sulfur-laden fuels are used to operate the microturbine. This includes stainless steel heat exchanger internal components and any exhaust ducting. 5. Low Pressure Steam Generation Microturbine exhaust can be used to generate small amounts of low pressure saturated steam ONLY. The temperature of the exhaust is generally not high enough to provide a . strong vaporizing force. Using the following method to calculate the mass flow, m , of steam generation with one C60 for the possible example of inlet water and outlet steam conditions: Q. = m. ( C p ? T + h f g ) where: Inlet water temperature, T1 = 150°F Desired outlet steam conditions (from steam tables) T2 = 65 psig, P2 = 300°F saturated steam hfg = 900 Btu/lb Total available exhaust energy = 541,000 Btu/hr Fraction of usable exhaust energy = 50% Specific heat of water, Cp = 1 Btu/lbm-°F . Plugging in, you find that m = 4.5 lb/min. Clearly, Capstone exhaust is more effective in heating water than generating steam. Applications Guide - Hot Water.doc Page 15 of 16 April 19, 2002PDF Image | Capstone App Guide CHP
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