不同控制策略下变风量空调系统夏季运行工况
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摘要
针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。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。
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,and setting pressure valve with fan power consumption respectively were analyzed and compared.Experimental results show that in addition to the set temperature,the Indoor Aai Quality(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 bereduced 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.
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,and setting pressure valve with fan power consumption respectively were analyzed and compared.Experimental results show that in addition to the set temperature,the Indoor Aai Quality(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 bereduced 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.
引文
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[20]刘健,程时柏,陈友明,等.变风量空调系统不同控制方法下的实测分析[J].流体机械,2013,41(4):65-69.LIU J,CHENG S B,CHEN Y M,et al.Performance measurement of VAV air system with different control methods[J].Fluid Machinery,2013,41(4):65-69.(in Chinese)
[2]ZHANG J,LI X,ZHAO T,et al.A review of static pressure reset control in variable air volume air condition system[J].Procedia Engineering,2015,121:1844-1850.
[3]ALIBABAEI N,FUNG A S,RAAHEMIFAR K.Development of Matlab-TRNSYS co-simulator for applying predictive strategy planning models on residential house HVAC system[J].Energy and Buildings,2016,128(15):81-98.
[4]ASADI E,DA SILVA M G,ANTUNES C H,et al.A multi-objective optimization model for building retrofit strategies using TRNSYS simulations,GenOpt and MATLAB[J].Building and Environment,2012,56(10):370-378.
[5]ZHU Y,JIN X,DU Z,et al.Online optimal control of variable refrigerant flow and variable air volume combined air conditioning system for energy saving[J].Applied Thermal Engineering,2015,80(5):87-96.
[6]AYNUR T N,HWANG Y,RADERMACHER R.Simulation comparison of VAV and VRF air conditioning systems in an existing building for the cooling season[J].Energy&Buildings,2009,41(11):1143-1150.
[7]YU X,YAN D,SUN K,et al.Comparative study of the cooling energy performance of variable refrigerant flow systems and variable air volume systems in office buildings[J].Applied Energy,2016,183(1):725-736.
[8]SONG L,WANG G.Using a hybrid method to construct a computational efficient cooling coil model for an automated single-duct variable air volume system fault detection and diagnosis[J].Energy and Buildings,2015,92(1):363-373.
[9]WANG H,CHEN Y,CHAN C W H,et al.Online model-based fault detection and diagnosis strategy for VAV air handling units[J].Energy and Buildings,2012,55(12):252-263.
[10]金宁,李春旺,胡佳林,等.上海某办公楼变风量空调系统设计运行分析[J].暖通空调,2012,42(4):60-63.JIN N,LI C W,HU J L,et al.VAV air conditioning system design and operation analysis of an office building in Shanghai[J].HV&AC,2012,42(4):60-63.(in Chinese)
[11]KANG S H,KIM H J,CHO Y H.A study on the control method of single duct VAV terminal unit through the determination of proper minimum air flow[J].Energy and Buildings,2014,69(3):464-472.
[12]朱进桃.变风量空调系统的节能运行[J].暖通空调,2014,44(5):97-102.ZHU J T.Energy saving operation of VAV air conditioning system[J].Journal of HV&AC,2014,44(5):97-102.(in Chinese)
[13]武根峰,曹勇.定静压变风量系统静压设定值的确定方法[J].暖通空调,2014,44(7):36-39.WU G F,CAO Y.Static pressure setpoint determination method for the fixed static pressure control VAV system[J].Journal of HV&AC,2014,44(7):36-39.(in Chinese)
[14]ZHANG J,LI X,ZHAO T,et al.Experimental study on a novel fuzzy control method for static pressure reset based on the maximum damper position feedback[J].Energy and Buildings,2015,108(1):215-222.
[15]LORENZENTTI D M,NORFORD L K.Pressure setpoint control of adjustable speed fans[J].Journal of Solar Energy Engineering,1994,116(3):158-163.
[16]SREVEN T,TAYLOR.Increasing efficiency with VAV system static pressure setpoint reset[J].Ashrae Journal,2007,49(6):24-32.
[17]郑慧凡,梁耀华,范晓伟,等.室内动态热舒适的影响因素分析[J].热科学与技术,2015,14(4):259-266.ZHENG H F,LIANG Y H,FAN X W,et al.Analysis of influencing factors of indoor dynamic thermal comfort[J].Journal of Thermal Science and Technology,2015,14(4):259-266.(in Chinese)
[18]邢丽娟,杨世忠.变风量空调系统房间舒适度温度优化设置[J].计算机仿真,2015,32(4):455-459.XING L J,YANG S Z.Room comfort temperature optimization setting of variable air volume air conditioning system[J].Computer Simulation,2015,32(4):455-459.(in Chinese)
[19]王海斌,晋欣桥,孙金龙,等.基于建筑储能的变风量空调系统避峰运行控制策略分析[J].流体机械,2006(3):70-73.WANG H B,JIN X Q,SUN Q L,et al.Analysis of energy storage based strategy of shifting peak operation of HVAC system[J].Fluid Machinery,2006(3):70-73.(in Chinese)
[20]刘健,程时柏,陈友明,等.变风量空调系统不同控制方法下的实测分析[J].流体机械,2013,41(4):65-69.LIU J,CHENG S B,CHEN Y M,et al.Performance measurement of VAV air system with different control methods[J].Fluid Machinery,2013,41(4):65-69.(in Chinese)