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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >SECONDARY FLUIDS FOR GAX ABSORPTION HEAT PUMP
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SECONDARY FLUIDS FOR GAX ABSORPTION HEAT PUMP

机译：气体吸收热泵的二次流体

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摘要

The gas-fired Generator-Absorber heat eXchanger (GAX) heat pump is being considered for space conditioning in residential and light commercial applications. In order to meet the national building codes for ammonia absorption heat pumps, a secondary fluid is used to interface with the air-coils. Proper choice of a secondary fluid maximizes the economic advantage of the GAX heat pump. The secondary fluid transfers the heating and cooling loads from the absorption heat pump to and from outdoor and indoor air-coils. The physical properties of secondary fluids influence the heat transfer performance in the heat-exchange equipment and hence the effective lift, thereby determining the cycle coefficient of performance (COP). Additionally, the pumping power for each fluid varies depending on the density and viscosity at operating temperatures. The variation in cycle COP and pumping power as a result of fluid properties is ultimately manifested as changes in electric and natural-gas cost. An analysis was carried out to evaluate six secondary fluids for a GAX absorption heat pump. A performance model was developed to simulate the secondary-fluid flow loops and the absorption heat pump. The utility costs for heating and cooling were determined for a typical building. The effects of ambient conditions and local utility rates were determined by modeling the annual utility costs in four cities: Atlanta, Chicago, Los Angeles, and New York. These four cities provided wide variations in heating and cooling requirements, and utility rates for natural gas and electricity. The results from this study provide a basis for selecting secondary fluids for heat pumping in different locations.
机译：燃气发生器-吸收器换热器（GAX）热泵正在考虑用于住宅和轻型商业应用中的空间调节。为了满足国家关于吸收氨的热泵的建筑规范，使用二次流体与气圈接口。正确选择辅助流体可最大化GAX热泵的经济优势。二次流体将吸收和吸收负荷的热负荷和冷负荷传递给室外和室内空气线圈以及从室外和室内空气线圈传递热量。二次流体的物理性质会影响热交换设备中的传热性能，进而影响有效升程，从而决定性能循环系数（COP）。另外，每种流体的泵浦功率取决于工作温度下的密度和粘度。流体特性导致的循环COP和泵送功率的变化最终表现为电力和天然气成本的变化。进行了分析以评估GAX吸收式热泵的六种二次流体。开发了一个性能模型来模拟二次流体流动回路和吸收热泵。确定了典型建筑物的供热和制冷费用。通过模拟四个城市（亚特兰大，芝加哥，洛杉矶和纽约）的年度公用事业成本来确定环境条件和当地公用事业费率的影响。这四个城市在供暖和制冷需求以及天然气和电力的实用率方面差异很大。这项研究的结果为选择用于不同位置热泵的二次流体提供了基础。

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