一种大空间分层空调逐时冷负荷设计计算方法
Design calculation method for stratified air conditioning hourly cooling load in large-space buildings
摘要：
根据热平衡原理分析了分层空调冷负荷的构成,提出了一种大空间分层空调逐时冷负荷计算方法。以上海某大空间热环境实验建筑的2种分层空调形式为研究对象进行了实验和计算,结果表明:中部喷口送风分层空调的3种工况冷负荷计算值与实验供冷量的平均绝对百分比误差为6.6%;下送风分层空调3种工况的平均绝对百分比误差为4.6%。验证后结合这2种分层空调形式的2个计算案例求解了该大空间的分层空调逐时冷负荷,在相同设计条件下,中部喷口送风分层空调冷负荷指标为108 W/m2,下送风分层空调冷负荷指标为76 W/m2,下送风峰值负荷仅为中部喷口送风的70.4%。本文所提出的分层空调逐时冷负荷计算方法可供分层空调工程设计参考。
Abstract：
Based on the heat balance principle, this paper analyses the composition of the stratified air conditioning cooling load and develops a calculation method for stratified air conditioning hourly cooling load in large-space buildings. Taking a large-space thermal environment experimental building in Shanghai with two stratified air conditioning forms as the research object, the results show that in three cases of middle nozzle air supply stratified air conditioning system, the mean absolute percentage error (MAPE) between the calculated cooling load and the experimental cooling capacity is 6.6%. In three cases of low-sidewall air supply stratified air conditioning system, the MAPE is 4.6%. After verification, combined with two calculation cases of these two stratified air conditioning forms, the stratified air conditioning hourly cooling load is solved. Under the same design conditions, the cooling load index of the middle nozzle air supply system is 108 W/m2, and that of the low-sidewall air supply system is 76 W/m2. It can be seen that the peak load of the low-sidewall air supply system is only 70.4% of that of the middle nozzle air supply system. The proposed calculation method for stratified air conditioning hourly cooling load can be used as a reference for the engineering design of stratified air conditioning system.
Keywords:large-space building; stratified air conditioning; hourly cooling load; design calculation method; middle nozzle air supply; low-sidewall air supply