燃气快速热水器的热效率评价方法

Research on Method of Evaluating Thermal Efficiency of Instantaneous Gas Water Heater

目前燃气快速热水器的热效率是在单一试验条件下进行测试和定义的,但实际的情况是热水器处于不同的使用条件下,热效率参数的改变是必然的。因此,燃气快速热水器的热效率评价不能用单一条件下的热效率指标进行,应该采用全年平均热效率进行评价。文中对不同运行工况下的燃气快速热水器的热效率变化规律进行了大量的实验研究和科学的理论分析,提出了采用全年平均热效率进行评价的新的热效率评价方法,并对全年平均热效率的计算方法进行了详细的介绍。

The thermal efficiency of the fast gas water heaters is an important index sign to reflect the efficiency of its utilization for energy resources,the executing of the signs and standers of utilization for energy resources of gas equipments will put forward some very high request with the objectivity to it. This index sign is tested and defined under the single experimental condition.But that is different in practice.The water heaters work under the various conditions and the changes of the thermal efficiency parameters are inevitable.Therefore the thermal efficiency evaluation for the fast gas water heaters can not carry through with the thermal efficiency which is tested under the single condition and the all-year average thermal efficiency should be adopted.Aiming at the orderliness about the changeful thermal efficiency of the fast gas water heaters which work under the different conditions,we do a flood of experiment research and scientific theoretic analysis ,and bring forward a new evaluation means for the thermal efficiency,that is the all-year average thermal efficiency should be adopted in evaluation.This paper also introduces the calculational methods of the all-year average thermal efficiency detailedly.