基于医院用能的天然气分布式能源站综合效益分析*
Comprehensive benefit analysis of natural gas distributed energy station based on hospital energy consumption
摘要：
以医院天然气分布式能源站为例，采用单位面积法估算冷热负荷，按以冷热定电的方式确定发电设备容量。对比常规分供系统，经济上通过财务净现值、动态投资回收期、财务内部收益率，节能上通过能量当量法，对医院建设天然气分布式能源站进行了效益分析。结果表明：分布式能源系统比常规分供系统初投资高585万元，年运行费用低519.58万元，财务净现值为887.12万元，动态投资回收期为7.86 a，财务内部收益率为17%，年节约标准煤2 954 t。
Abstract：
Taking the natural gas distributed energy station in a hospital as an example, estimates the heating and cooling load by the unit area method, and determines the capacity of power generation equipment according to the electricity consumption of heating and cooling. Comparing the new energy supply system with the conventional electricity-gas supply system, analyses the benefit of the natural gas distributed energy station in the hospital from financial net present value, dynamic investment pay back period and financial internal rate of return in economy and by means of energy equivalent method in energy saving. The results show that the initial investment of the distributed energy system is 5.85 million yuan higher than that of the conventional sub supply system, the annual operation cost is 5.1958 million yuan lower, the financial net present value is 8.8712 million yuan, the dynamic investment payback period is 7.86 years, the financial internal rate is 17%, and the annual saved standard coal is 2 954 tons.
Keywords:natural gas distributed energy system, hospital building, heat-to-electric ratio, cost- benefit approach, energy saving