Abstract
Industrial exhausted heat can be used as the heat source of central heating for higher energy efficiency. To recover more industrial exhausted heat, a new low-temperature central heating system integrated with industrial exhausted heat using distributed electric compression heat pumps is put forward and analyzed from the aspect of thermodynamics and economics. The roles played by the distributed electric compression heat pumps in improving both thermal performance and financial benefit of the central heating system integrated with industrial exhausted heat are greater than those by the centralized electric compression heat pumps. The proposed low-temperature central heating system has higher energy efficiency, better financial benefit, and longer economical distance of transmitting exhausted heat, and thus, its configuration is optimal. For the proposed low-temperature central heating system, the annual coefficient of performance, annual product exergy efficiency, heating cost, and payback period are about 22.2, 59.4%, 42.83 ¥/GJ, and 6.2 years, respectively, when the distance of transmitting exhausted heat and the price of exhausted heat are 15 km and 15 ¥/GJ, respectively. The economical distance of transmitting exhausted heat of the proposed low-temperature central heating system could approach 25.1 km.
Highlights
The rapid development of China’s urbanization results in the insufficiency of the heating capacity of existing central heating sources [1]
To clearly clarify the performance of the central heating system, the annual coefficient of performance (ACOP) is presented, and it is defined to be the ratio of annual heat provision to annual electricity consumption, as follows: R
The proposed low-temperature central heating systems integrated with industrial exhausted heat using distributed electric compression heat pumps is studied from the aspect of thermal performance and economic benefit, and conclusions are listed as follows: (1)
Summary
The rapid development of China’s urbanization results in the insufficiency of the heating capacity of existing central heating sources [1]. The longer economical distance of transporting exhausted heat helps to solve the above problem of space mismatch between industry plants and urban districts [11], and contributes to constructing the heating network of central heating systems based on multi-source energy [5]. Decreasing the return water temperature of the primary network contributes to increasing the economical distance of transporting exhausted heat, and helps to recover exhausted heat efficiently [25]. Both the absorption heat exchanger [26] and the ejector heat exchanger [27] can greatly decrease the return water temperature of the primary network in substations, but they need higher-temperature supply water as the driving heat source, which is not lower than 120 ◦ C. To solve the above problem, a new low-temperature central heating system integrated with industrial exhausted heat using distributed electric compression heat pumps (CH-DHP) is proposed
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