科研之友
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摘要
In northern China, urban heating energy consumption accounts for about 40% of the total building energy consumption and emits a lot of pollutants to atmosphere environment, while tremendous low grade industrial waste heat is discharged into the environment. Utilizing these industrial waste heat for central heating in winter is of great importance in energy saving and atmosphere environment protection. Hence, it raised more concerns during recent years. However, in traditional systems, such waste heat is used to produce relatively low temperature supply water through heat exchangers. It leads to large mass flow rate in the primary network, which results in huge pumping energy consumption after long distance delivery, since the heating users are often far away from the industrial waste heat sources. In this paper, applying the concept of heat adaptor put forward in our previous paper, an ideal central heating system using such industrial waste heat is determined. It is composed of two heat adaptors at heat source and substations respectively. The optimal return water temperature in the primary network of the ideal central heating system is derived to be the ambient air temperature. Compared with a conventional central heating system including heat exchanger system or absorption heat exchanger system, the return water temperature, mass flow rate and delivery pumping energy consumption of an ideal central heating system can be decreased greatly. In the illustrative example, the delivery pumping energy consumption is reduced by 82%, by using the proposed ideal central heating system. It is hoped that the method developed in the present paper is helpful for optimization design of practical central heating systems using industrial waste heat.
