Terhan Meryem
Department of Mechanical Engineering, Engineering and Natural Sciences Faculty, 162318Gumushane University, 29100, Gumushane, Turkey.
Sci Prog. 2022 Jul-Sep;105(3):368504221122287. doi: 10.1177/00368504221122287.
District heating systems are provided solutions for the increasing energy problems in high-population cities. Energy costs go up depending on increasing heat loss in DHS's distribution network. Heat loss from the network consists of 5-20% of transferred energy, and this loss is higher than the other losses in the heating system. In the study, heat losses from the pipes such as supply-return pipes, hot water and circulation pipes into heat canals are investigated based on energy, exergy, economic and environmental. Optimum insulation thicknesses, energy savings, reduction of CO emissions, the first investment costs and payback periods of the pipes in the network of all-generation district heating systems are investigated by using Life Cycle Cost Analysis (LCCA) method for fuel types like natural gas, fuel oil and coal. Optimum insulation thicknesses are calculated for different nominal sizes of pipes and various insulation materials such as glass wool, and rock wool for the different climatic zones. According to the results of the study, the heat losses from pipes in the 4th generation DHS network are decreased between 38.19% and 33.33% from the warmest climate zone to the coldest climate zone according to the 3rd generation. Energy savings, reduction of CO emissions, payback periods and optimum insulation thickness values of supply and return pipes in the network are respectively changed between 7.80-98.86 $/m, 39.61-322.32 kg CO/year, 0.028-0.38 years and 0.025-0.0105 m depending on various fuel types, insulation materials, nominal size pipes, climatic zones and all generation types.
区域供热系统为人口密集城市日益增长的能源问题提供了解决方案。能源成本会随着区域供热系统（DHS）配电网热损失的增加而上升。网络中的热损失占传输能量的5%-20%，且这一损失高于供热系统中的其他损失。在该研究中，基于能量、火用、经济和环境因素，对诸如供回水管、热水管以及进入热渠道的循环管等管道的热损失进行了研究。通过使用生命周期成本分析（LCCA）方法，针对天然气、燃油和煤炭等燃料类型，研究了全发电区域供热系统网络中管道的最佳保温厚度、节能情况、二氧化碳排放量的减少、初始投资成本以及投资回收期。针对不同管径的管道以及玻璃棉、岩棉等各种保温材料，计算了不同气候区的最佳保温厚度。根据研究结果，与第三代区域供热系统网络相比，第四代区域供热系统网络中管道的热损失在最温暖气候区到最寒冷气候区之间减少了38.19%至33.33%。网络中供回水管的节能情况、二氧化碳排放量的减少、投资回收期以及最佳保温厚度值，分别因各种燃料类型、保温材料、管径、气候区和全发电类型的不同，在7.80 - 98.86美元/米、39.61 - 322.32千克二氧化碳/年、0.028 - 0.38年以及0.025 - 0.0105米之间变化。
