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首页> 外文期刊>Energy and Buildings >Comprehensive analysis of the performance and intrinsic energy losses of centralized Domestic Hot Water (DHW) systems in commercial (educational) buildings
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Comprehensive analysis of the performance and intrinsic energy losses of centralized Domestic Hot Water (DHW) systems in commercial (educational) buildings

机译：商业（教育）建筑中集中性热水（DHW）系统性能和内在能源损失综合分析

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The energy demand for supplying Domestic Hot Water (DHW) has an important share in the overall thermal energy consumption of commercial buildings. The aim of this paper is to analyze the performance of DHW production in commercial public service, i.e., educational buildings, to subsequently identify frequent inherent shortcomings of centralised DHW installations and to provide measures for optimization or economically more viable solutions. Several buildings of the University of Natural Resources and Life Sciences in Vienna have been investigated in terms of DHW consumption and performance of the installed centralised systems.Referring to the investigated university buildings, it can be stated, that in cases of low to medium consumption figures, typical centralized DHW installations with a hot water circulation pipework achieve only poor efficiencies in the range of 2-12%. As for one particular centralized DHW system in operation, focusing on demand controlled DHW supply through adapted flow control, e.g., reducing the runtime of the circulating pumps at specific time intervals, and, if applicable and feasible, decreasing hot water flow- and storage capacities can reduce annual energy consumption for DHW by 15-25% and improve the overall system efficiency significantly as could be evaluated in a detailed case study.A seemingly economical yet ecologically controversial option for improving centralised DHW systems is the partial or complete conversion to electric point-of-use water heaters. This reduces thermal energy losses almost completely, hereby significantly increasing the efficiency of a DHW supply system. Nevertheless, existing hot water supply systems, energized by district heating, usually consume less primary energy and most likely generate fewer CO2 emissions compared to electric DHW heaters. (C) 2019 Elsevier B.V. All rights reserved.
机译：供应国内热水（DHW）的能源需求在商业建筑的总热能消耗中具有重要份额。本文的目的是分析商业公共服务中DHW生产的表现，即教育建筑，随后识别集中式DHW装置的常见内在缺点，并提供优化或经济更具可行的解决方案的措施。在DHW消费和安装集中系统的表现方面，在维也纳进行了几大建筑物的自然资源和生命科学。有助于调查大学建筑，可以说明，在低至中等消费数据的情况下，具有热水循环管道的典型集中式DHW安装在2-12％的范围内只能造成差的效率。对于操作中的一个特定的集中式DHW系统，通过调整的流量控制，专注于需求控制的DHW供应，例如，以特定的时间间隔减少循环泵的运行时间，并且如果适用和可行，可以降低热水流量和存储容量可以将DHW的年能消耗降低15-25％，并在详细案例研究中可以评估，提高整体系统效率。看似经济的尚未生态上的改善集中式DHW系统的争议选择是对电点的部分或完全转换 - 使用热水器。这几乎完全降低了热能损失，从而显着提高了DHW供应系统的效率。然而，现有的热水供应系统由区供暖，通常消耗较少的主要能量，并且与电动DHW加热器相比，最有可能产生较少的二氧化碳排放。 （c）2019 Elsevier B.v.保留所有权利。

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