Low delta-T syndrome is known to decrease the energy efficiency of chilled water systems and jeopardize human thermal comfort. Many studies have addressed low delta-T syndrome, suggesting possible measures to solve or mitigate its symptoms. However, while numerous measures have been proposed, a connection to the fundamental causes and the potential side effects that could cause low delta-T syndrome is lacking. This systematic literature review aims to identify measures to address low delta-T syndrome in various parts of chilled water systems and classify the 25 identified measures for the four subclasses of low delta-T syndrome as treatments or fixes. For the subclass of low delta-T syndrome without increased flow, fifteen measures were classified as a treatment; five were classified as a fix and five could not be classified. For the three subclasses of low delta-T syndrome with increased flow, 11 were classified as fixes, nine as a treatment and five could not be classified. The main reason four of the six measures could not be classified is due the disputed cause of laminar or transitional flow condition inside the cooling coil tubes. Despite the reported positive effects in existing chilled water systems, many measures are considered fixes because they do not address the fundamental causes of low delta-T syndrome but merely mitigate its signs and symptoms.

中文翻译：

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冷却系统中低 delta-T 综合征的治疗和修复的系统评价


众所周知，低 delta-T 综合征会降低冷冻水系统的能源效率并危及人体热舒适度。许多研究都解决了低 delta-T 综合征，提出了解决或减轻其症状的可能措施。然而，虽然已经提出了许多措施，但缺乏与可能导致低 delta-T 综合征的根本原因和潜在副作用的联系。本系统文献综述旨在确定解决冷冻水系统各个部分低 delta-T 综合征的措施，并将针对低 delta-T 综合征的四个亚类的 25 种已确定的措施分类为治疗或修复。对于没有流量增加的低 delta-T 综合征亚类，15 项措施被归类为治疗;5 项被归类为 FIX，5 项无法分类。对于流量增加的低 delta-T 综合征的 3 个亚类，11 个被归类为 fix，9 个被归类为治疗，5 个无法归类。六项措施中有四项无法分类的主要原因是由于冷却盘管内部层流或过渡流条件的争议原因。尽管据报道对现有冷冻水系统产生了积极影响，但许多措施被认为是修复方法，因为它们没有解决低 delta-T 综合征的根本原因，而只是缓解其体征和症状。