风管计算表
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一、通风管道流量阻力表1、缩伸软管摩擦阻力表2、镀锌板风管摩擦阻力表说明(1).软管采用荷兰数据时,上述数据乘以下系数:Φ150x2;Φ200x1.8;Φ250x1.5;Φ300x1.3 (2).局部摩擦阻力:(3)与散流器的摩擦阻力:(4).保持风速必须的动压:当v=2m/s时, ΔP=2.4Pa;当v=3m/s时, ΔP=5.4Pa当v=4m/s时, ΔP=9.6Pa;当v=5m/s时, ΔP=15Pa当v=6m/s时, ΔP=21PaV2(5).其他局部阻力的计算按下式:2gΔP=ζ─γ二、室内送回风口尺寸表1、风口风量冷量对应表2、不同送风方式的风量指标和室内平均流速ASHRAE三、室内风管风速选择表1、低速风管系统的推荐和最大流速m/s2、低速风管系统的最大允许速m/s3、通风系统之流速m/s注:民用住宅≤35dB(A),商务办公≤45dB(A)。
四、室内风口风速选择表1、送风口风速2、以噪音标准控制的允许送风流速m/s3、推荐的送风口流速m/s4、送风口之最大允许流速m/s5、回风口风速6、回风格栅的推荐流速m/s7、百叶窗的推荐流速m/s8、逗留区流速与人体感觉的关系9、顶棚散流器送风量10、侧送风口送风量五、通风系统设计1、送风口布置间距回风口应根据具体情况布置一般原则:(1)人不经常停留的地方; (2)房间的边和角; (3)有利于气流的组织。
2、标准型号风盘所接散流器的尺寸表-办公室风盘型号风量方散尺寸FP m3/h mm3.5 350 200*2005 500 200*2006.3 630 250*2508 800 250*25010 1000 300*30012.5 1250 300*30016 1600 350*35020 2500 450*45025 2500 450*450 注:办公室推荐送风口流速:2.5-4.0m/s风机盘管接风管的风速:通常为1.5—2.0m/s之间,不能大于2.5m/s,否则会将冷凝水带出来。