Sayegh Marderos Ara, Ludwińska Agnieszka, Rajski Krzysztof, Dudkiewicz Edyta
Wroclaw University of Science and Technology, Faculty of Environmental Engineering, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Wroclaw University of Science and Technology, Faculty of Environmental Engineering, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Sci Total Environ. 2021 Mar 20;761:143220. doi: 10.1016/j.scitotenv.2020.143220. Epub 2020 Oct 24.
Reducing energy consumption, increasing energy efficiency technologies and solutions, decreasing emissions are very effective tools towards EU environmental policy. The constant demand for domestic hot water (DHW) throughout the year creates great benefits for drain water heat recovery (DWHR) systems in hotels, which is the most promising and significant feature of energy saving potential for the hotel sector in Poland. This paper determines the feasibility of heat recovery in a typical hotel in Poland. The energy analysis was carried out for the installed DWHR system (from washbasins and showers) at the hotel building. To evaluate the energy saving potentiality, daily, monthly and yearly calculation results were performed for an exemplary hotel in Poland. Two types of heat exchangers were adopted for further calculations: vertical (System 1) and horizontal (System 2), this intention aimed to find the most efficient type and relevant solution of energy saving and reduction of CO2 emissions in the analysed hotel. The analysis and calculations were repeated to enhance the saving potentiality of the proposed DWHR systems for various parameters like constant and variable temperature of supply cold water, daily hot water consumption profiles, the efficiency of heat recovery, reduction of annual carbon dioxide emission (CDE), facility standard of operating procedure, the impact of hotel size, etc. The obtained results of the conducted calculations ensure a significant potential of energy savings by implementing the proposed DWHR systems in analysed hotel, which allow to save energy demand and to reduce CO2 emission by 27.3% and improve the efficiency of the DHW preparation system.
降低能源消耗、增加能源效率技术与解决方案、减少排放是实现欧盟环境政策的非常有效的工具。全年对生活热水（DHW）的持续需求为酒店的排水余热回收（DWHR）系统带来了巨大益处，这是波兰酒店业节能潜力最具前景且最为显著的特征。本文确定了波兰一家典型酒店余热回收的可行性。对酒店建筑中已安装的DWHR系统（来自洗脸盆和淋浴）进行了能源分析。为评估节能潜力，对波兰一家示例酒店进行了每日、每月和每年的计算结果。进一步计算采用了两种类型的热交换器：立式（系统1）和卧式（系统2），目的是在分析的酒店中找到最有效的类型以及节能和减少二氧化碳排放的相关解决方案。针对诸如供应冷水的恒定和可变温度、每日热水消耗曲线、热回收效率、年度二氧化碳排放量（CDE）的减少、设施操作程序标准、酒店规模的影响等各种参数，重复进行分析和计算，以提高所提议的DWHR系统的节能潜力。所进行计算的结果表明，在分析的酒店中实施所提议的DWHR系统具有显著的节能潜力，这能够节省能源需求并将二氧化碳排放量减少27.3%，同时提高生活热水制备系统的效率。
