变负荷工况区域供冷管网冷损失分析*
Cooling loss of district cooling pipe network under variable load conditions
摘要：
介绍了区域供冷管网的冷损失计算方法，并对典型项目在不同敷设方式、不同负荷率下的管网冷损失进行了计算。结果表明：直埋敷设方式的管网冷损失最小；设计工况下，二次管网冷损失在总输送冷量中占比较小，可控制在1%以下，其中二级泵造成的冷损失占比可达78%以上，是管网冷损失的主要因素。不同负荷工况下，二级泵与管道冷损失比例变化明显：负荷率为80%时，二级泵造成的冷损失占比为75%左右；负荷率为30%时，二者所占比例接近，各占总冷损失的50%；负荷率为10%时，管道冷损失占比达到70%以上，成为系统冷损失的主要部分。
Abstract：
Presents the calculation method of cooling loss for district cooling pipe network and calculates the cooling loss of pipe network under different laying ways and load rates for a typical project. The result shows that directly buried pipe network can keep a minimum cooling loss. The cooling loss of the secondary pipe network accounts for a small part of its total transport cooling capacity, which can be controlled less than 1%, and the cooling loss of the secondary pump is the key factor and can account for more than 78% under design condition. Cooling loss rates of secondary pump and pipe change significantly under different load rates. The cooling loss of secondary pump accounts for 75% under 80% load rate, and the cooling loss of pipe and secondary pump each accounts for 50% under 30% load rate. However, the cooling loss of pipe accounts for 70% under 10% load rate, which becomes the main part of system cooling loss.
Keywords:districtcooling,coolingloss,secondarypump,directburiedpipe,in-ductpipe