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首页> 外文会议>AES-vol.46; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >ROLE OF INDOOR AIR DISTRIBUTION IN PERFORMANCE OF HEAT PUMP SYSTEMS IN ENERGY-EFFICIENT RESIDENTIAL BUILDINGS
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ROLE OF INDOOR AIR DISTRIBUTION IN PERFORMANCE OF HEAT PUMP SYSTEMS IN ENERGY-EFFICIENT RESIDENTIAL BUILDINGS

机译：室内空气分配在节能住宅建筑中的热泵系统性能中的作用

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摘要

This paper demonstrates the potential impact of indoor air distribution on the energy consumption of central HVAC systems with cognizance of human thermal comfort. The study focuses on a hypothetical high-performance house incorporating a split heat pump system. The air distribution of this building incorporates high sidewall supply-air registers and near-floor, wall-mounted return-air grilles. Heating-mode stratification resulting from this prevalent configuration is a prime example of situations in which challenges regarding energy efficiency, comfort, and ventilation effectiveness emerge. These challenges underline the importance of adopting a comprehensive design strategy for high-performance buildings. Two indoor air distribution scenarios were analyzed: (1) theoretically well mixed and (2) poorly mixed, representing a realistic case. The former scenario was evaluated using an analytical approach, whereas the latter was investigated through computational fluid dynamics (CFD) simulations. For heating mode, the results indicated the presence of a pronounced thermal stratification resulting from poor air mixing. At 50% of the design heating load, for the well-mixed case, the HVAC system energy consumption was significantly higher. Considerably better air distribution performance was observed with cooling mode, in which the relative energy penalty for the well-mixed scenario was noticeably less. In real-world applications where measures must be taken to achieve near perfectly mixed indoor conditions for better comfort, the energy use is expected to be even higher. However, in the absence of such measures, the thermostat setpoint is likely to be readjusted, leading to a higher energy use without necessarily improving the overall comfort level, as demonstrated in this paper. The limitation of increasing the supply-air flow rate to enhance air mixing and diffusion is also discussed in terms of the system moisture removal capability.
机译：本文证明了室内空气分配对中央HVAC系统能耗的潜在影响，并具有人类热舒适性。这项研究的重点是假想的高性能房屋，其中装有分体式热泵系统。该建筑物的空气分配包括高侧壁供气通风器和近地面，壁挂式回风格栅。由这种普遍配置导致的加热模式分层是出现有关能源效率，舒适性和通风效率的挑战的典型示例。这些挑战强调了对高性能建筑采用全面设计策略的重要性。分析了两种室内空气分配方案：（1）理论上混合良好，（2）混合不良，代表了实际情况。前一种情况是使用分析方法进行评估的，而后一种情况是通过计算流体动力学（CFD）模拟进行研究的。对于加热模式，结果表明由于空气混合不良而存在明显的热分层。在设计供暖负荷为50％的情况下，对于充分混合的情况，HVAC系统的能耗要高得多。在冷却模式下观察到了明显更好的空气分配性能，在这种模式下，充分混合的情况下的相对能量损失明显更少。在实际应用中，必须采取措施达到接近完美混合的室内条件，以获得更好的舒适度，预计能源消耗会更高。但是，如无本文所述，在没有此类措施的情况下，很可能会重新调整恒温器的设定点，从而导致更高的能耗，而不必提高整体舒适度。还从系统除湿能力的角度讨论了增加送风量以增强空气混合和扩散的限制。

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