制冷机房课程设计说明书.doc

--------------------------校验:_____________-----------------------日期:_____________制冷机房课程设计说明书摘要工程概况:该机房制冷系统为四管制系统,即冷却水供/回水管、冷冻水供/回水管系统。经冷水机组制冷后的7℃的冷冻水通过冷冻水供水管到达分水器,再通过分水器分别送往旅馆的各个区域,经过空调机组后的12℃的冷冻水回水经集水器再由冷冻水回水管返回冷水机组,通过冷水机组中的蒸发器与制冷剂换热实现降温过程。从冷水机组出来的37℃的冷却水经冷却水供水管到达冷却塔,经冷却塔冷却后降温后再返回冷水机组冷却制冷剂,如此循环往复。考虑到系统的稳定安全高效地运行,系统中配备补水系统,软化水系统,全程水处理系统等附属系统。关键词:住宅、制冷机房、设计目录第1章原始资料··································1第2章方案设计······························2·····························2····························2····························2第3章制冷循环系统热力计算···························3第4章冷水机组的选择···························5第5章管径的确定···························6第6章水泵的选择···························7······························7······························7······························7第7章其它设备的选型···························8······························9························9······························9······························9设计小结································10主要参考文献·····························11第1章原始资料一、设计题目民安药厂低温空调系统冷源设计二、原始资料1、建筑物修建地区:长春2、气象资料:查阅《规范》及相关手册3、空调负荷总计:2500KW4、要求供应的载冷剂温度:冷冻水供水温度7℃;5、制冷剂种类:R22;。6、冷却介质:采用循环水(补充自来水);7、冷冻站平面图(见附图另发,层高6米)。第2章方案设计该机房制冷系统为四管制系统,即冷却水供/回水管、冷冻水供/回水管系统。经冷水机组制冷后的7℃的冷冻水通过冷冻水供水管到达分水器,再通过分水器分别送往旅馆的各个区域,经过空调机组后的12℃的冷冻水回水经集水器再由冷冻水回水管返回冷水机组,通过冷水机组中的蒸发器与制冷剂换热实现降温过程。从冷水机组出来的37℃的冷却水经冷却水供水管到达冷却塔,经冷却塔冷却后降温后再返回冷水机组冷却制冷剂,如此循环往复。考虑到系统的稳定安全高效地运行,系统中配备补水系统,软化水系统,全程水处理系统等附属系统。本设计采用落地式膨胀水箱来实现冷冻水系统的补水和定压。管材的选择与防腐空调系统的供回水管采用碳素钢管,公称直径DN≥50mm,采用无缝钢管,DN≤50mm,采用普通焊接钢管,DN≥100时,采用卡箍式连接。冷冻水管保温材料类型为B型,对于水管,DN200-DN300厚度20mm。冷冻水和冷却水都刷双层镀锌层,每层2mm厚。第3章
制冷循环系统热力计算制冷循环系统的热力计算是根据确定的蒸发温度,冷凝温度,液态制冷剂的再冷度和压缩机的吸气温度等已知条件,通过压焓图,求出各状态点的参数以及相关数值。℃,冷却水与空气充分接触,冷却水进口温度t1比空气湿球温度高3-6℃,冷却水进口温度t1定为32℃。蒸发温度比冷冻水供水温度低2-3℃,冷冻水供水温度7℃,蒸发温度定为4℃。对于水冷式冷凝器,冷凝温度与冷却水进口温度差取10℃,冷却水进出口温差取5℃,冷凝温度tk=40℃,冷却水出口温度t2=37℃。定制冷理论循环的热力计算压焓图如下图所示:T=40℃T=4℃即φo=2700kw单位质量制冷能力qo=h1-h4=kj/kg单位容积制冷能力qv=qo/v1=kj/m3制冷剂质量流量Mr=φo/qo=2700/1/s制冷剂体积流量Vr=Mrv13/s冷凝负荷φk=Mrqk=Mr(h2-h3压缩机理论功率Pth=Mr(h2-h1理论制冷系数εth=φ