Optimizing environmental insulation thickness of buildings with CHP-based district heating system based on amount of ene
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RESEARCH ARTICLE
Yumei ZHANG, Pengfei JIE, Chunhua LIU, Jing LI
Optimizing environmental insulation thickness of buildings with CHP-based district heating system based on amount of energy and energy grade
© Higher Education Press 2020
Abstract The increase of insulation thickness (IT) results in the decrease of the heat demand and heat medium temperature. A mathematical model on the optimum environmental insulation thickness (OEIT) for minimizing the annual total environmental impact was established based on the amount of energy and energy grade reduction. Besides, a case study was conducted based on a residential community with a combined heat and power (CHP)-based district heating system (DHS) in Tianjin, China. Moreover, the effect of IT on heat demand, heat medium temperature, exhaust heat, extracted heat, coal consumption, carbon dioxide (CO2) emissions and sulfur dioxide (SO2) emissions as well as the effect of three types of insulation materials (i.e., expanded polystyrene, rock wool and glass wool) on the OEIT and minimum annual total environmental impact were studied. The results reveal that the optimization model can be used to determine the OEIT. When the OEIT of expanded polystyrene, rock wool and glass wool is used, the annual total environmental impact can be reduced by 84.563%, 83.211%, and 86.104%, respectively. It can be found that glass wool is more beneficial to the environment compared with expanded polystyrene and rock wool. Keywords optimum environmental insulation thickness, Received Feb. 2, 2020; accepted Jun. 11, 2020; online Oct. 15, 2020
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Yumei ZHANG, Pengfei JIE ( ) School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China E-mail: [email protected] Chunhua LIU Engineering and Technology R&D Center of Clean Air Conditioning in Colleges of Shandong, Shandong Huayu University of Technology, Dezhou 253000, China Jing LI China Environmental Resources Technology Co., Ltd, Beijing 100012, China
heat medium temperature, energy grade, extracted heat, exhaust heat
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Introduction
The transition to new energy systems with less pollutant emissions requires new district heating technologies. The energy consumption and pollutant emissions of the 4th generation district heating system (DHS) can be greatly reduced by using the heat pump technique and the integration of renewable energy technologies [1]. On the other hand, combined heat and power (CHP) can raise the overall energy efficiency compared to individually electricity and heat production in conventional systems [2]. Therefore, the application of CHP-based DHS is considered to be the key measure for sustainable development [3]. Currently, there are about 80000 DHS in the world [4], the majority of which are located in the northern hemisphere [5], especially in Europe [1]. Due to the exploitation of national geothermal resources, DHSs have a market share of nearly 90% in Iceland [5]. In Finland, DHS are widely used in about 200 cities [6]. In Sweden, DHS are used to provide approximately 91% o
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