ABSTRACT

The solar absorption-subcooled compression hybrid cooling system (SASCHCS), in which the cooling capacity of absorption subsystem serves as the subcooling power of compression subsystem, is energy-efficient for high-rise buildings. Because the existing design guideline of system is based on the conventional exergy theory and the advanced exergy analysis of absorption and vapor compression chillers is from the endogenous avoidable portion instead of the sum of the avoidable exergy destruction, it is incapable to design the SASCHCS exactly by such findings. As a result, the systematical advanced exergy analysis of SASCHCS is performed. The advanced exergy model of facilities is built at first. Subsequently, various exergy destructions for different conditions are analyzed. Finally, the improvement potential of components is assessed based on the sum of the avoidable exergy destruction, defined as the sum of endogenous avoidable portion of k-th component and exogenous one of remaining components led by irreversibilities of k-th component. Though the compressor concentrates the most exergy destruction of SASCHCS, 62% of its exogenous exergy destruction is caused by the irreversibilities of the condenser of the compression subsystem, making the condenser the most important component of SASCHCS. The paper is helpful to promote the design of SASCHCS.

摘要

太阳能吸收-过冷压缩混合冷却系统（SASCHCS），其中吸收子系统的冷却能力作为压缩子系统的过冷功率，对于高层建筑是节能的。由于现有的系统设计指南是基于传统的火用理论，并且吸收式和蒸汽压缩式制冷机的高级火用分析是从内生可避免部分而不是可避免的火用破坏的总和，因此无法准确地设计 SASCHCS这样的发现。因此，对 SASCHCS 进行了系统的高级火用分析。首先建立先进的设施火用模型。随后，分析了不同条件下的各种火用破坏。最后，第k个分量和由第k个分量的不可逆性导致的外源性剩余分量之一。虽然压缩机集中了 SASCHCS 的大部分火用破坏，但其 62% 的外源火用破坏是由压缩子系统冷凝器的不可逆性造成的，使冷凝器成为 SASCHCS 最重要的组成部分。该论文有助于推动SASCHCS的设计。