firing machine meaning in English

点火设备
放炮器

By means of engineering examples , a comparison is made on the economy and environmental protection for four cooling and heat sources , including gas direct - fired machine , centralized heat - supply plus electric refrigerating , gas boiler plus electric refrigerating and air source heat pump plus gas peak - shaving boiler
通过工程实例，对以燃气直燃机、集中供热电制冷、燃气锅炉电制冷、空气源热泵燃气调峰锅炉4种冷热源的经济、环保性进行了比较。