Feasibility Analysis of Building Heating System Based on Thermal-Economical Evaluation

摘要

Building heating energy consumption accounts for about 19.12% of total energy consumption in China in 2014. With the development of building energy-saving technology, renewable energy heating systems, such as GSHP (ground source heat pump), solar energy, air source heat pump, show high energy efficiency and low emissions, which are gradually replacing traditional heating systems. However, due to the restriction of existing productivity and environment conditions, the capital investment of such renewable heating systems is often much higher than traditional ones. As a result, the advantage of renewable heating system is hard to be realized, since its application is highly limited by economic factors. In this paper, traditional thermal-economical evaluation method is modified and improved for feasibility analysis of renewable heating system. Moreover, an illustrative example, which combines solar heating and air-source heat pump together, in Sichuan is given to show the preliminary application of the proposed method. The results indicate that the modified thermal-economical evaluation method can assess the feasibility of renewable heating systems more comprehensively, since it takes the indirect economic effects caused by energy saving and environment protection into consideration, which can balance the huge capital investment of such systems. For the studied case, solar collector combined with air-source heat pump is more preferable than traditional systems. This work is important for feasibility analysis and design optimization of building heating system with renewable energy.