热量变化，就会产生风和雨。
在热水供暖系统中，调节阀是改变热媒流动阻力、传热量变化及控制系统的调节装置。调节阀的选型、使用涉及多方面知识。
A governing valve is the instrument for changing flow resistance and heat transfer flux of hot water, controlling pressure and temperature of heating system.
建立了钻井单位井深换热量与钻井深度、流量变化关系的计算模型。
A mathematic model for the relationship between the rate of heat transfer per meter borehole and the depth of borehole as well as the flow rate was built.
从一年的热流量变化看，块石护坡路基冷季的放热量大于吸热量，路基储存冷能有利于保护冻土。
The annual released heat in cold reason is larger than the absorbed heat in warm season, which is helpful for protecting permafrost.
分析了燃煤发热量和炉渣含碳量变化对锅炉固体不完全燃烧热损失的影响，推导出在其他热损失不变的前提下固体不完全燃烧热损失对锅炉热平衡效率的影响。
The influence of calorific value of coal and carbon-content of cinder on the heat loss from solid incomplete combustion of the boiler were analysed in the paper.
分析了燃煤发热量和炉渣含碳量变化对锅炉固体不完全燃烧热损失的影响，推导出在其他热损失不变的前提下固体不完全燃烧热损失对锅炉热平衡效率的影响。
The influence of calorific value of coal and carbon-content of cinder on the heat loss from solid incomplete combustion of the boiler were analysed in the paper.
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