With the increasing of mining depth and exothermic function and diffusion progress of every kinds of heat source and so on, the heat damage of mines is becoming serious.
随着矿井开采深度的增加，由于各种热源的放热作用、扩散过程和其它原因，矿井热害日趋严重。
According to the characteristics of technology and economy of city untreated sewage source heat pump system, the mathematical models of annual cost object function are established.
根据现有城市原生污水源热泵的技术经济特点，以系统的费用年值为目标函数，建立了系统综合优化的数学模型。
According to the characteristics of technology and economy of city untreated sewage source heat pump system, the mathematical models of annual cost object function are established.
根据现有城市原生污水源热泵的技术经济特点，以系统的费用年值为目标函数，建立了系统综合优化的数学模型。
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