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不同控制策略下变风量空调系统夏季运行工况

2018-05-23丁帅孟庆龙常赛南

土木建筑与环境工程 2018年2期

丁帅 孟庆龙 常赛南

摘要:針对变风量空调实际运行中出现的冷热不均问题,通过运行两种变静压、一种定静压控制策略下的变风量系统,对比分析室温、风量、风机频率、最大阀位、设定静压值与风机能耗的关系。实验结果表明:变风量箱在设计控制阀门的算法中除设定温度之外还需要考虑IAQ、相对湿度等因素;使用变风量空调之前应将室温降至设定温度后再打开自动控制系统,避免受到算法的延迟影响;定静压输送单位冷负荷需要消耗的电量,比测点靠近风机的变静压控制策略多7.8%,且降温效果较差;外界环境几乎相同的情况下,变静压策略中,静压基础点远离风机的控制策略较靠近风机的控制策略降温效果好,速度至少快14%,消耗电量几乎相同。

关键词:变风量系统;变静压;定静压;能耗;温度

中图分类号:TU831.3 文献标志码:A文章编号:16744764(2018)02012408

收稿日期:20170610

基金项目:国家自然科学基金(51208059); 陕西省自然科学基础研究计划自然科学基金(2016JM5076)

作者简介:丁帅(1992),女,主要从事建筑设备自动化的研究,Email:rz_ds@qq.com。

孟庆龙(通信作者),男,副教授,硕士生导师,Email:mengqinglong@chd.edu.cn。

Received:20170610

Foundation item: Foundation item: National Natural Science Foundation of China (NSFC)(No. 51208059); Natural science foundationresearch project of Shanxi province (No. 2016JM5076)

Author brief:Ding Shuai(1992), main research interest: building automation, Email:rz_ds@qq.com.

Meng Qinglong(corresponding author), associate professor, graduate supervisor, Email: mengqinglong@chd.edu.cn.Analysis of cooling system in summer for VAV air conditioning

system under different control strategies

Ding Shuai1a, 2, Meng Qinglong1a, 1b, Chang Sainan1a

(1a. School of Environmental Science and Engineering, 1b. School of Civil Engineering; Changan University, Xian 710061,

P.R.China;2. Rizhao Donggang District Steel Supporting Industrial Park Service Center, Rizhao 276800, P.R.China)

Abstract:For solving the uneven cooling problem of VAV (variable air volume) air conditioning operation, two kinds of variable static pressure and one kind of constant pressure control strategies of VAV system were operated. The relationship of room temperature、air volume、fan frequency、maximum value position、setting pressure valve with fan power consumption respectively were analyzed and compared. Experimental results show that in addition to the set temperature, the IAQ、relative humidity and other factors should be considered in the design of valve control algorithm for variable air volume box; When using the variable air volume air conditioning system, the room temperature should be reduced to the set temperature, then the automatic control system is opened to avoid being affected by the delay of the algorithm. As to transporting unit cooling load, the electrical consumption under constant static strategy is more 7.8% than it under variable pressure strategy which static pressure measuring point is nearing the fan. And the cooling effect of constant static strategy is poor. Under the same outside conditions, compared to variable pressure strategy with static pressure measuring point nearing the fan, the cooling effect under the variable pressure strategy with static pressure measurement point far away from the fan is better. The cooling rate is at least 14% faster. And the consumption of electricity is almost the same.

Keywords:VAV; variable static pressure; constant static pressure; energy consumption; temperature

变风量(VAV, variable air volume)空调以其节省能耗、智能化[12]等优点在中国得到了越来越广泛的推广,但目前的工程应用中,变风量系统并没有达到预期的效果。现在的研究当中,一个方向是利用软件,如Matlab、Trnsys等预测负荷、室外温度或利用优化算法[35]来计算系统能耗,或对比变风量系统与其他空调系统能耗消耗情况[67],另外一个方向是对组合空调机组与系统进行故障诊断[89]。……

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