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现行 LV-17-C012
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Sensitivity of Energy and Exergy Performances of Heating and Cooling Systems to Auxiliary Components 加热和冷却系统的能量和火用性能对辅助部件的敏感性
建筑供暖和制冷系统由三个主要子系统组成:供暖/制冷设备、配电系统和室内终端设备。室内终端设备的选择决定了配电系统和可使用的加热和冷却设备的特性。供暖和制冷系统使用不同形式的能源(电和热),因此,需要对系统设计和分析采用整体方法。特别是,配电系统使用电力作为泵和风扇以及其他部件的直接输入。因此,除了能量分析外,整个供暖和制冷系统的设计和分析还应使用火用概念。在这项研究中,水基(地板加热和冷却,以及散热器加热)和空气基(空气加热和冷却)加热和冷却系统在辅助部件(泵和风扇)的能耗和火用消耗方面进行了比较。 确定了辅助部件对整个系统能量和火用性能的影响。水基供暖系统所需的辅助(火用)输入比带热回收的暖风供暖系统低68%,地板冷却系统所需的辅助(火用)输入比空气冷却系统低53%,这表明水基系统明显优于空气基系统。不同系统的辅助能量和火用输入是整个系统性能的重要参数。它的影响变得更加明显,可以从火用而不是能量的角度更好地进行研究。用于空间加热和冷却的发电厂所需的火用输入与辅助部件所需的火用输入相当。应尽量减少辅助部件的火用输入,以充分受益于水- 基于低温供暖和高温制冷系统,以及一般的供暖和制冷系统,并将可再生能源有效地整合到建筑供暖和制冷系统中。引文:2017年冬季会议,内华达州拉斯维加斯,会议论文
Heating and cooling systems in buildings consist of three main subsystems: heating/cooling plant, distribution system, and indoor terminal unit. The choice of indoor terminal unit determines the characteristics of the distribution system and the heating and cooling plants that can be used.Different forms of energy (electricity and heat) are used in heating and cooling systems, and therefore, a holistic approach to system design and analysis is needed. In particular, distribution systems use electricity as a direct input to pumps and fans, and to other components. Therefore, exergy concept should be used in design and analysis of the whole heating and cooling systems, in addition to the energy analysis. In this study, water-based (floor heating and cooling, and radiator heating) and air-based (air heating and cooling) heating and cooling systems were compared in terms of their energy use and exergy consumption for auxiliary components (pumps and fans). The effects of the auxiliary components on whole system energy and exergy performance were identified.Water-based heating systems required 68% lower auxiliary exergy input than the warm-air heating system with heat recovery, and floor cooling system required 53% lower auxiliary exergy input than the air cooling system, showing a clear benefit for the water-based systems over the air-based systems.The auxiliary energy and exergy input to different systems is an important parameter for the whole system performance. Its effects become more pronounced and can be studied better in terms of exergy than energy. The required exergy input to the power plant for space heating and cooling purposes are comparable to the required exergy input for auxiliary components. The exergy input to auxiliary components should be minimized to fully benefit from the water-based low temperature heating and high temperature cooling systems, and in general in heating and cooling systems, and to integrate effectively the renewable energy resources to building heating and cooling systems.
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