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VAV System’s Air Duct Anari
1390/08/12
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ﻣﺨﺘﺼﺮﻱ ﺩﺭﺑﺎﺭﻩ ﺳﻴﺴﺘﻢ ﻫﺎﻱ :VAV ﺍﻳﻦ ﻣﻘﺎﻟﻪ ﺷﺎﻣﻞ: •
ﻣﺤﺎﺳﺒﻪ ) CFMﻓﻮﺕ ﻣﻜﻌﺐ ﺩﺭ ﺩﻗﻴﻘﻪ( ﺩﺭ ﻛﺎﻧﺎﻝ ﻫﻮﺍ
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ﺗﻌﻴﻴﻦ CFM ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﻟﻮﻟﻪ ﭘﻴﺘﻮﺕ ﺑﻪ ﺻﻮﺭﺕ ﻋﺮﺿﻲ. ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ Flow Hoodﺩﺭ ﺩﺭﻳﭽﻪ. ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺳﺮﻋﺖ ﺑﻪ ﺻﻮﺭﺕ ﻋﺮﺿﻲ ﺩﺭ ﺍﺟﺰﺍء ﺳﻴﺴﺘﻢ.
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ﻓﺸﺎﺭ ﺩﺭ ﻛﺎﻧﺎﻝ ﻫﻮﺍ ).(VP,SP,TP
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ﺗﺒﺪﻳﻞ ) VPﻓﺸﺎﺭ ﺳﺮﻋﺘﻲ( ﺑﻪ ﺳﺮﻋﺖ ﺑﺮ ﺣﺴﺐ ) FPMﻓﻮﺕ ﺑﺮ ﺩﻗﻴﻘﻪ( ﺩﺭ ﺳﻄﺢ ﺩﺭﻳﺎ: ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺭﺍﺑﻄﻪ. ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺟﺪﻭﻝ.
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ﻣﺤﺎﺳﺒﻪ ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﻳﻚ ﻓﻀﺎ.
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ﻣﺤﺎﺳﺒﻪ ﻫﻮﺍﻱ ﺧﺎﺭﺝ ﻭ ﻫﻮﺍﻱ ﻣﺨﻠﻮﻁ ﺷﺪﻩ.
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ﻣﺤﺎﺳﺒﻪ BHPﻓﻦ ﻭ RPMﻓﻦ.
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ﺳﺎﻳﺰﺯﻧﻲ ﻓﻦ ﻫﺎﻱ ﺳﺎﻧﺘﺮﻳﻔﻴﻮژ ﺑﺎ ﻧﻤﺎﻱ ﺗﻴﻐﻪ ﺑﻪ ﺳﻤﺖ ﻋﻘﺐ ﻭﻓﻦ ﻫﺎﻱ ﺳﺎﻧﺘﺮﻳﻔﻮژ ﺍﻳﺮﻓﻮﻳﻞ.
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ﻃﺮﺍﺣﻲ ﻣﺘﺪﺍﻭﻝ ﺑﺮ ﺍﺳﺎﺱ ﺳﺮﻋﺖ ﺩﺭ ﺍﺟﺰﺍﻱ ﺳﻴﺴﺘﻢ ﻫﺎﻱ ﺗﻬﻮﻳﻪ ﻣﻄﺒﻮﻉ.
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CFMﺗﻮﺻﻴﻪ ﺷﺪﻩ ﺑﺮﺍﻱ ﺩﻳﻔﻴﻮﺯﺭﻫﺎﻱ ﺳﻘﻔﻲ.
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ﺿﺨﺎﻣﺖ ﻭﺭﻕ ) (Gageﺑﺮﺍﻱ ﻛﺎﻧﺎﻝ ﺳﺮﻋﺖ ﭘﺎﺋﻴﻦ.
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ﺳﺎﻳﺰ ﺯﻧﻲ ﻛﺎﻧﺎﻝ ﺑﺮﺍﻱ ﺳﺮﻋﺖ ﭘﺎﻳﻴﻦ.
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ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺷﺮﺍﻳﻄﻲ ﻏﻴﺮ ﺍﺯ ﺣﺎﻟﺖ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ.
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ﻣﺤﺎﺳﺒﻪ ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺷﺮﺍﻳﻄﻲ ﻏﻴﺮﺍﺯ ﺣﺎﻟﺖ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ.
ﻣﺤﺎﺳﺒﻪ ) CFMﻣﻘﺪﺍﺭ ﺟﺮﻳﺎﻥ ﻫﻮﺍ( ﺩﺭ ﻳﻚ ﻛﺎﻧﺎﻝ: ﺑﺮﺍﻱ ﻣﺤﺎﺳﺒﻪ ،CFMﺍﺯ ﺍﻳﻦ ﺭﺍﺑﻄﻪ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ:
CFM=Area×FPM =Areaﻣﺴﺎﺣﺖ ﺳﻄﺢ ﻣﻘﻄﻊ ﻛﺎﻧﺎﻝ ﺑﺮ ﺣﺴﺐ ﻓﻮﺕ ﻣﺮﺑﻊ =FPMﺳﺮﻋﺖ ﻫﻮﺍ ﺑﺮ ﺣﺴﺐ ﻓﻮﺕ ﺑﺮ ﺩﻗﻴﻘﻪ
ﺗﻌﻴﻴﻦ ) CFMﻣﻘﺪﺍﺭ ﺟﺮﻳﺎﻥ ﻫﻮﺍ(: ﺭﻭﺵ ﺍﻭﻝ:ﺗﻌﻴﻴﻦ CFMﺩﺭ ﻛﺎﻧﺎﻝ ﺑﺎ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﻋﺒﻮﺭ ﻳﻚ ﻟﻮﻟﻪ ﭘﻴﺘﻮﺕ ﺑﻪ ﺻﻮﺭﺕ ﻋﺮﺿﻲ: ) VPﻓﺸﺎﺭ ﺳﺮﻋﺘﻲ( ﺧﻮﺍﻧﺪﻩ ﺷﺪﻩ ﺭﺍ ﺑﻪ ﺳﺮﻋﺖ ﺑﺮ ﺣﺴﺐ FPMﺗﺒﺪﻳﻞ ﻛﻨﻴﺪ )ﺻﻔﺤﺎﺕ 2ﻭ 3ﺭﺍ ﺑﺒﻴﻨﻴﺪ( ﻣﻴﺎﻧﮕﻴﻦ ﺳﺮﻋﺖ ﻫﺎ ﺭﺍ ﺑﺮ ﺣﺴﺐ FPMﺑﺪﺳﺖ ﺁﻭﺭﻳﺪ. ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ:
CFM=AreaxFPM
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ﺭﻭﺵ ﺩﻭﻡ :ﺗﻌﻴﻴﻦ CFMﺑﺎ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ Flow Hoodﺩﺭ ﺩﺭﻳﭽﻪ ﻫﺎ Flow Hood،ﻣﺴﺘﻘﻴﻤﺎ ﻣﻘﺪﺍﺭ CFMﺧﻮﺍﻧﺪﻩ ﺷﺪﻩ ﺭﺍ ﻣﻲ ﺩﻫﺪ. ﺭﻭﺵ ﺳﻮﻡ :ﺗﻌﻴﻴﻦ CFMﺑﺎ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺳﺮﻋﺖ ﺑﻪ ﺻﻮﺭﺕ ﻋﺮﺿﻲ ﻛﻪ ﺳﺮﻋﺖ ﻣﺘﻮﺳﻂ ﺭﺍ ﺩﺭ ﻫﺮ ﻋﻀﻮ ﺍﺯ ﺳﻴﺴﺘﻢ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﻣﻲ ﻛﻨﺪ. ﺍﺯ ﻭﺳﻴﻠﻪ ﺍﻱ ﻣﺎﻧﻨﺪ ﺳﺮﻋﺖ ﺳﻨﺞ ﻛﻪ ﺳﺮﻋﺖ ﺭﺍ ﺑﺮ ﺣﺴﺐ
FPMﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﻣﻲ ﻛﻨﺪ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ.ﺳﭙﺲ ﭼﻨﺪﻳﻦ ﻗﺮﺍﺋﺖ ﺩﺭ ﻛﻮﻳﻞ،ﻣﺨﺰﻥ
ﻓﻴﻠﺘﺮ،ﺩﺭﻳﭽﻪ ﻳﺎ ﺳﺎﻳﺮ ﺍﺟﺰﺍء ﺍﻧﺠﺎﻡ ﺩﻫﻴﺪ ﺗﺎ ﺳﺮﻋﺖ ﻣﺘﻮﺳﻂ ﻣﺸﺨﺺ ﺷﻮﺩ.ﺍﻳﻦ ﻗﺮﺍﺋﺖ ﻫﺎ ﺑﺎﻳﺪ ﺩﺭ ﺳﻄﺢ ﻣﻘﻄﻊ ﻣﺴﺎﻭﻱ ﻭ ﺑﺮﺍﺑﺮ ﺍﻧﺠﺎﻡ ﮔﻴﺮﺩ.ﻣﺎﻧﻨﺪ ﻣﺮﻛﺰ ﻫﺮ ﺳﻠﻮﻝ ﻓﻴﻠﺘﺮ ﺩﺭ ﻣﺨﺰﻥ ﻓﻴﻠﺘﺮ ﺳﭙﺲ ﻣﻴﺎﻧﮕﻴﻦ ﻗﺮﺍﺋﺖ ﻫﺎ ﺭﺍ ﺑﺪﺳﺖ ﺁﻭﺭﻳﺪ ﻭ CFMﺭﺍ ﺍﺯ ﺭﺍﺑﻄﻪ CFM=AreaxFPMﻣﺤﺎﺳﺒﻪ ﻛﻨﻴﺪ. ﻓﺸﺎﺭ ﺩﺭ ﻛﺎﻧﺎﻝ ﻓﺸﺎﺭ ﻛﻞ ) (TPﺩﺭ ﻳﻚ ﻛﺎﻧﺎﻝ ﺷﺎﻣﻞ ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ ) ( SPﻭ ﻓﺸﺎﺭ ﺳﺮﻋﺘﻲ ) (VPﻭ ﺭﻭﺍﺑﻂ ﺯﻳﺮ ﺍﺭﺗﺒﺎﻁ ﺑﻴﻦ ﺁﻧﻬﺎ ﺭﺍ ﺑﻴﺎﻥ ﻣﻲ ﻛﻨﺪ:
TP=SP+VP ﺗﺒﺪﻳﻞ VPﺑﻪ ﺳﺮﻋﺖ ﺑﺮ ﺣﺴﺐ FPMﺩﺭ ﺳﻄﺢ ﺩﺭﻳﺎ: ﺑﻪ ﻣﻨﻈﻮﺭ ﻣﺤﺎﺳﺒﻪ ﺟﺮﻳﺎﻥ ﻫﻮﺍ ﺑﺮ ﺣﺴﺐ ،CFMﻓﺸﺎﺭ ﺳﺮﻋﺘﻲ ) (VPﺑﻪ ﺳﺮﻋﺖ ﺑﺮ ﺣﺴﺐ ) (FPMﺗﺒﺪﻳﻞ ﻣﻲ ﺷﻮﺩ. ﺭﻭﺵ ﺍﻭﻝ:ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﻳﻚ ﺭﺍﺑﻄﻪ ﺑﺮﺍﻱ ﺗﺒﺪﻳﻞ VPﺑﻪ FPMﺩﺭ ﺳﻄﺢ ﺩﺭﻳﺎ:
𝑉𝑉𝑉𝑉√=4005Xﺳﺮﻋﺖ ﺭﻭﺵ ﺩﻭﻡ:ﺑﺎ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺟﺪﺍﻭﻝ )ﺑﺮﺍﻱ ﺳﻄﺢ ﺩﺭﻳﺎ( ﺑﻪ ﻣﻨﻈﻮﺭ ﺗﺒﺪﻳﻞ VPﺑﻪ ﺳﺮﻋﺖ ﺑﺮ ﺣﺴﺐ : FPM )VP(“wg 0.7637 0.8079 0.8534 0.9002 0.9482 0.9975 1.0480 1.0997 1.1527 1.2069 1.2624 1.3191 1.3771 1.4364 1.4968 1.5586 1.6215 1.6857 1.7512 1.8179 1.8859 1.9551 2.0256 2.0972 2.1701 2.2443 2.3198 2.3965 2.4744 2.5536 2.6340 2.7157
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FPM 3500 3600 3700 3800 3900 4000 4100 4200 4300 4400 4500 4600 4700 4800 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 5900 6000 6100 6200 6300 6400 6500 6600
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)VP(“wg 0.0056 0.0097 0.0155 0.0224 0.0305 0.0399 0.0504 0.0623 0.0754 0.0897 0.1053 0.1221 0.1402 0.1596 0.1801 0.2019 0.2250 0.2493 0.2749 0.3017 0.3297 0.3591 0.3896 0.4214 0.4544 0.4887 0.5243 0.5610 0.5991 0.6384 0.6789 0.7206
FPM 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 3200 3300 3400
ﻣﺤﺎﺳﺒﻪ ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﻳﻚ ﻣﻜﺎﻥ: ﺑﻪ ﻣﻨﻈﻮﺭ ﻣﺤﺎﺳﺒﻪ ﺗﻌﺪﺍﺩ ﺩﻓﻌﺎﺕ ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﻳﻚ ﺍﺗﺎﻕ،ﺍﺯ ﺭﺍﺑﻄﻪ ﺫﻳﻞ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ:
ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﺳﺎﻋﺖ=
ﺑﺮﺍﻱ ﻣﺸﺨﺺ ﻛﺮﺩﻥ ﺯﻣﺎﻥ ﻣﻮﺭﺩ ﻧﻴﺎﺯ ﺑﺮ ﺣﺴﺐ ﺩﻗﻴﻘﻪ ﻛﻪ ﻫﻮﺍﻱ ﺍﺗﺎﻕ ﺑﻪ ﻃﻮﺭ ﻛﺎﻣﻞ ﺗﻌﻮﻳﺾ ﺷﻮﺩ ﺩﺭ ﺣﺎﻟﻲ ﻛﻪ
𝟔𝟔𝟔𝟔×𝐂𝐂𝐂𝐂𝐂𝐂
ﺣﺠﻢ ﺍﺗﺎﻕ )ﻓﻮﺕ ﻣﻜﻌﺐ(
CFMﻣﺸﺨﺺ ﺍﺳﺖ،ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ
ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ: ﺯﻣﺎﻥ ﻣﻮﺭﺩ ﻧﻴﺎﺯ )ﺑﺮ ﺣﺴﺐ ﺩﻗﻴﻘﻪ( =
ﺣﺠﻢ ﺍﺗﺎﻕ )ﻓﻮﺕ ﻣﻜﻌﺐ( 𝑪𝑪𝑪𝑪𝑪𝑪
ﺟﻬﺖ ﺗﻌﻴﻴﻦ CFMﻣﻮﺭﺩ ﻧﻴﺎﺯ ﺑﺮﺍﻱ ﺗﻌﺪﺍﺩ ﺩﻓﻌﺎﺕ ﻣﻌﻴﻦ ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﺳﺎﻋﺖ ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ: =CFMﺣﺠﻢ ﺍﺗﺎﻕ )ﻓﻮﺕ ﻣﻜﻌﺐ(X
ﺗﻌﻮﻳﺾ ﻫﻮﺍ ﺩﺭ ﺳﺎﻋﺖ 𝟔𝟔𝟔𝟔
ﻣﺤﺎﺳﺒﻪ ﻫﻮﺍﻱ ﺧﺎﺭﺝ ﻭ ﻫﻮﺍﻱ ﻣﺨﻠﻮﻁ ﺷﺪﻩ:
ﺑﻪ ﻣﻨﻈﻮﺭ ﻣﺤﺎﺳﺒﻪ ﺩﺭﺻﺪ ﻫﻮﺍﻱ ﺧﺎﺭﺝ ) (OAﻣﻮﺭﺩ ﻧﻴﺎﺯ ﻳﻚ ﺳﻴﺴﺘﻢ ﺗﻬﻮﻳﻪ ﻣﻄﺒﻮﻉ،ﺩﺭ ﺣﺎﻟﻲ ﻛﻪ ﺩﻣﺎﻫﺎﻱ ﻫﻮﺍ ﻣﺸﺨﺺ ﺍﺳﺖ ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ: )X100 =%OAﺩﺭﺻﺪ ﻫﻮﺍﻱ ﺧﺎﺭﺝ
RAT −MAT RAT −OAT
(=%OA
=RATﺩﻣﺎﻱ ﻫﻮﺍﻱ ﺑﺮﮔﺸﺘﻲ =MATﺩﻣﺎﻱ ﻫﻮﺍﻱ ﻣﺨﻠﻮﻁ ﺷﺪﻩ. =OATﺩﻣﺎﻱ ﻫﻮﺍﻱ ﺧﺎﺭﺝ ﻧﻜﺘﻪ :ﺍﮔﺮ ﺩﻣﺎﻱ ﻫﻮﺍﻱ ﻣﺨﻠﻮﻁ ﺷﺪﻩ ﺑﻌﺪ ﺍﺯ ﻓﻦ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺷﺪﻩ ﺑﺎﺷﺪ،ﺑﻪ ﺍﺯﺍﻱ ﻫﺮ ﺍﻳﻨﭻ ﺍﻓﺰﺍﻳﺶ ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ ﺩﺭ ﻓﻦ 0.5⁰Fﺍﺯ ﺩﻣﺎﻱ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺷﺪﻩ ﻛﻢ ﻛﻨﻴﺪ ﺗﺎ ﺩﻣﺎﻱ ﻫﻮﺍﻱ ﻣﺨﻠﻮﻁ ﺷﺪﻩ ﺑﺮﺍﻱ ﻣﺤﺎﺳﺒﻪ ﺣﺠﻢ ﻫﻮﺍﻱ ﺧﺎﺭﺝ ﺑﺪﺳﺖ ﺁﻳﺪ. ﻣﺤﺎﺳﺒﻪ BHPﻭ RPMﻓﻦ: ﺟﻬﺖ ﺗﻌﻴﻴﻦ BHPﻓﻦ ﺑﺮ ﭘﺎﻳﻪ ﺭﺍﻧﺪﻣﺎﻥ ﺍﺳﺘﺎﺗﻴﻚ ﻓﻦ)(SEﻭﺍﻓﺰﺍﻳﺶ ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺷﺪﻩ )(SPﺩﺭ ﻓﻦ ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ: ×100ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ×CFM
ﺍﺳﺐ ﺑﺨﺎﺭ ﺗﺮﻣﺰﻱ ﻓﻦ)=(BHP ﺟﻬﺖ ﻣﺤﺎﺳﺒﻪ RPMﻓﻦ ﺑﺮ ﭘﺎﻳﻪ ﻗﻄﺮ ﭘﻮﻟﻲ ﻣﻮﺗﻮﺭ )،(dﻗﻄﺮ ﭘﻮﻟﻲ ﻓﻦ ) (Dﻭ RPMﻣﻮﺗﻮﺭ،ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ:
ﺭﺍﻧﺪﻣﺎﻥ ﺍﺳﺘﺎﺗﻴﻚ ﻓﻦ×6356
d×Motor RPM 𝐷𝐷
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=Fan Rpm
ﺳﺎﻳﺰ ﺯﻧﻲ ﻓﻦ ﻫﺎﻱ ﺳﺎﻧﺘﺮﻳﻔﻮژ ﺑﺎ ﺍﻧﺤﻨﺎﻱ ﺗﻴﻐﻪ ﺑﻪ ﺳﻤﺖ ﻋﻘﺐ ﻭ ﻓﻦ ﻫﺎﻱ ﺳﺎﻧﺘﺮﻳﻔﻮژ ﺍﻳﺮ ﻓﻮﻳﻞ: ﺍﮔﺮ ﻣﻲ ﺧﻮﺍﻫﻴﺪ ﻓﻨﻲ ﺭﺍ ﺟﺎﻳﮕﺰﻳﻦ ﻛﻨﻴﺪ ﺍﺯ ﺍﻃﻼﻋﺎﺕ ﺯﻳﺮ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ. ﻓﻦ ﻫﺎ ﺑﻬﺘﺮﻳﻦ ﻋﻤﻠﻜﺮﺩ ﺭﺍ ﺍﺯ ﻟﺤﺎﻅ ﺻﺪﺍ ﻭ ﺑﻴﺸﺘﺮﻳﻦ ﺭﺍﻧﺪﻣﺎﻥ ﺭﺍ ﺩﺭ ﺍﻳﻦ ﻣﺤﺪﻭﺩﻩ ﺧﻮﺍﻫﻨﺪ ﺩﺍﺷﺖ: ﺳﺮﻋﺖ ﺧﺮﻭﺟﻲ )(FPM
ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ)("wg
800 to 1000 800 to 1150 900 to 1300 1000 to 1400 1200 to 1600 1400 to 1800 1600 to 2000 1600 to 2200 1800 to 2400 2000 to 2600 2200 to 2800
0.5 and less 0.75 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
ﻣﺜﺎﻝ: ﻳﻚ ﻓﻦ ﺑﺎﻳﺪ 25,000 CFMﺭﺍ ﺩﺭ ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ 2.5ﺍﻳﻨﭻ ﺍﻳﺠﺎﺩ ﻛﻨﺪ.ﺑﺮ ﺍﺳﺎﺱ ﺟﺪﻭﻝ ﺳﺮﻋﺖ ﺧﺮﻭﺟﻲ ﺑﺎﻳﺪ 1400ﺗﺎ FPM 1800ﺑﺎﺷﺪ.ﺑﺎ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺍﻳﻦ ﺍﻃﻼﻋﺎﺕ ﺳﻄﺢ ﻣﻘﻄﻊ ﺧﺮﻭﺟﻲ ﺑﻪ ﺩﺳﺖ ﻣﻲ ﺁﻳﺪ: 25000 1400 25000 1800
= 17.9 𝑓𝑓𝑓𝑓²
= 13.9 𝑓𝑓𝑓𝑓²
ﺍﺯ ﻛﺎﺗﺎﻟﻮگ ﺳﺎﺯﻧﺪﻩ ،ﻓﻨﻲ ﺍﻧﺘﺨﺎﺏ ﻣﻲ ﺷﻮﺩ ﻛﻪ ﺳﻄﺢ ﻣﻘﻄﻊ ﺧﺮﻭﺟﻲ ﺁﻥ ﺑﻴﻦ 13.9 ft²ﻭ 17.9 ft²ﺑﺎﺷﺪ ﻭ 25000 CFMﺭﺍ ﺩﺭ ﻓﺸﺎﺭ ﺍﺳﺘﺎﺗﻴﻚ 2.5ﺍﻳﻨﭻ ﺍﻳﺠﺎﺩ ﻛﻨﺪ.
ﻃﺮﺍﺣﻲ ﻣﺘﺪﺍﻭﺍﻝ ﺑﺮ ﺍﺳﺎﺱ ﺳﺮﻋﺖ ﺩﺭ ﺍﺟﺰﺍﻱ ﺳﻴﺴﺘﻢ ﻫﺎﻱ ﺗﻬﻮﻳﻪ ﻣﻄﺒﻮﻉ: ﻋﻀﻮ
ﺳﺮﻋﺖFPM
ﻛﻮﻳﻞ ﺳﺮﺩ ﻛﻨﻨﺪﻩ
500
ﻛﻮﻳﻞ ﮔﺮﻡ ﻛﻨﻨﺪﻩ
500
ﻓﻴﻠﺘﺮ ﻫﺎ ﺭﺍﺗﺪﻣﺎﻥ ﭘﺎﺋﻴﻦ
500
ﺭﺍﻧﺪﻣﺎﻥ ﻣﺘﻮﺳﻂ
500
ﺭﺍﻧﺪﻣﺎﻥ ﺑﺎﻻ
500
ﻫﭙﺎ
250
CFMﺗﻮﺻﻴﻪ ﺷﺪﻩ ﺑﺮﺍﻱ ﺩﻳﻔﻴﻮﺯﺭ ﻫﺎﻱ ﺳﻘﻔﻲ: CFMﺗﻮﺻﻴﻪ ﺷﺪﻩ ﺑﺮﺍﻱ ﺩﻳﻔﻴﻮﺯﺭ ﻫﺎﻱ ﺳﻘﻔﻲ ﮔﻠﻮ ﮔﺮﺩ ﺑﺎ ﺳﺴﻄﺢ ”24”x24 CFM 75 to 150 100 to 200 150 to 250 200 to 350 300 to 450 400 to 575 5
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ﻗﻄﺮ ﮔﻠﻮﻳﻲ ”6 ”7 ”8 ”10 ”12 ”14
ﺿﺨﺎﻣﺖ ﻭﺭﻕ ) (Gageﺑﺮﺍﻱ ﻛﺎﻧﺎﻝ ﺳﺮﻋﺖ ﭘﺎﻳﻴﻦ: ﻛﺎﻧﺎﻝ ﭼﻬﺎﺭ ﮔﻮﺵ ﻭﺍﺣﺪ ﮔﻴﺞ
ﺑﺰﺭﮔﺘﺮﻳﻦ ﺑﻌﺪ
ﻭﺍﺣﺪ ﮔﻴﺞ
ﻗﻄﺮ
26 24 22 20 18 16
”UP to 12 ”13” to 30 ”31” to 54 ”55” to 84 ”85” to 96 96” and larger
26 24 22 20 18
”3” to 26 ”27” to 36 ”37” to 50 ”51” to 60 ”60” to 84
ﺍﻧﺪﺍﺯﻩ ﮔﺰﺍﺭﻱ ﻛﺎﻧﺎﻝ ﺳﺮﻋﺖ ﭘﺎﺋﻴﻦ: 6
ﻛﺎﻧﺎﻝ ﻣﺪﻭﺭ
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ﺍﺑﻌﺎﺩ ﻛﺎﻧﺎﻝ ﭼﻬﺎﺭ ﮔﻮﺵ 24
22
20
18
16
14
ﻛﺎﻧﺎﻝ ﻣﺪﻭﺭ 4
)ﺍﻳﻨﭻ(
6
5
50
6
8
6
100
8
12
7
150
8
14
8
200
10
16
8
250
8
12
20
9
300
10
14
24
10
350
10
12
16
26
10
400
10
12
16
11
450
10
14
18
11
500
12
14
20
11
550
12
14
22
12
600
12
18
24
12
650
12
16
24
12
700
12
14
18
28
14
800
12
10
8
8
24
7
CFM
6
14
16
20
14
900
14
18
24
14
1000
14
16
18
24
14
1100
14
16
20
26
16
1200
16
18
20
28
16
1300
16
18
22
30
16
1400
16
20
24
32
16
1500
16
18
20
26
34
16
1600
16
18
20
26
36
18
1700
16
18
22
28
38
18
1800
18
20
24
28
18
1900
18
20
24
30
18
2000
18
20
22
26
32
20
2200
18
20
24
28
34
20
2400
20
22
24
30
36
20
2600
20
22
26
32
40
20
2800
20
22
24
28
34
22
3000
20
22
26
30
36
22
3200
20
22
26
30
36
22
3400
22
24
28
32
40
24
3600
22
26
28
34
40
24
3800
22
24
26
30
36
42
24
4000
22
24
28
32
38
46
24
4200
24
26
28
32
40
48
24
4400
24
26
28
32
40
48
24
4600
24
28
30
34
42
26
4800
26
28
32
36
44
26
5000
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ﻣﺜﺎﻝ: ﺟﺮﻳﺎﻥ ﻫﻮﺍﻱ ﻣﻮﺭﺩ ﻧﻴﺎﺯ=2000 CFM ﻗﻄﺮ ﻣﻌﺎﺩﻝ ﻛﺎﻧﺎﻝ ﻣﺪﻭﺭ=”18 ﻛﺎﻧﺎﻝ ﭼﻬﺎﺭ ﮔﻮﺵ ﺑﺎ ﻣﻘﺎﻭﻣﺘﻲ ﻣﻌﺎﺩﻝ ﻛﺎﻧﺎﻝ ﻗﻄﺮ ” 18ﻣﻲ ﺗﻮﺍﻧﺪ ﺍﺑﻌﺎﺩ 30x10,24x12,20x14,18x16ﺑﺎﺷﺪ. ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺷﺮﺍﻳﻂ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ: ﺷﺮﺍﻳﻂ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ ﻋﺒﺎﺭﺕ ﺍﺳﺖ ﺍﺯ ﺩﻣﺎﻱ 70ﺩﺭﺟﻪ ﻓﺎﺭﻧﻬﺎﻳﺖ ﺩﺭ ﺳﻄﺢ ﺩﺭﻳﺎ.ﺩﺭ ﺷﺮﺍﻳﻂ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ ﭼﮕﺎﻟﻲ ﻫﻮﺍ 0.075lb/ftᶟﺍﺳﺖ. ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺷﺮﺍﻳﻂ ﻏﻴﺮ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ: ﻣﺜﺎﻝ: ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺍﺭﺗﻔﺎﻉ 5200ﻓﻮﺕ ﻭ ﺩﻣﺎﻱ 200ﺩﺭﺟﻪ ﻓﺎﺭﻧﻬﺎﻳﺖ ﭼﻘﺪﺭ ﺍﺳﺖ؟ = Ct
ﭼﮕﺎﻟﻲ = CE × Ct ×0.075
ﭼﮕﺎﻟﻲ=0.050 lb/ftᶟ
30
→
8000 0.067 0.064 0.061 0.058 0.056 0.055 0.054 0.052 0.050 0.049 0.048 0.046 0.044 0.043 0.042 0.041 0.040 0.038
8
7000 0.070 0.067 0.064 0.061 0.059 0.058 0.057 0.055 0.053 0.051 0.050 0.048 0.047 0.045 0.044 0.043 0.042 0.040
6000 0.072 0.069 0.066 0.063 0.061 0.060 0.059 0.057 0.054 0.053 0.051 0.050 0.048 0.046 0.045 0.044 0.043 0.042
5000 0.075 0.072 0.069 0.066 0.063 0.062 0.061 0.059 0.057 0.055 0.053 0.052 0.050 0.048 0.047 0.046 0.045 0.043
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2000 0.084 0.080 0.077 0.074 0.071 0.070 0.069 0.066 0.063 0.061 0.060 0.058 0.056 0.054 0.053 0.051 0.050 0.048
�
= CE
CE =0.827
ﭼﮕﺎﻟﻲ= 0.075 × 0.803 ×0.827
ﺍﺭﺗﻔﺎﻉ ﺍﺯ ﺳﻄﺢ ﺩﺭﻳﺎ )(ft 4000 0.078 0.074 0.072 0.068 0.066 0.065 0.064 0.061 0.059 0.057 0.055 0.054 0.052 0.050 0.049 0.048 0.047 0.045
0.803= Ct
1000 �−30 500
ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺩﻣﺎﻫﺎ ﻭ ﺍﺭﺗﻔﺎﻉ ﻫﺎﻱ ﻣﺘﻔﺎﻭﺕ:
3000 0.081 0.077 0.074 0.071 0.068 0.067 0.066 0.064 0.061 0.059 0.057 0.056 0.054 0.052 0.051 0.049 0.049 0.046
530
)(460+200
1000 0.087 0.083 0.080 0.076 0.073 0.072 0.071 0.068 0.066 0.064 0.062 0.060 0.058 0.056 0.055 0.053 0.052 0.050
0 0.090 0.086 0.083 0.079 0.076 0.075 0.074 0.071 0.068 0.066 0.064 0.062 0.060 0.058 0.057 0.055 0.054 0.052
ﺩﻣﺎﻱ ﻫﻮﺍ )(˚F -20 0 20 40 60 70 80 100 120 140 160 180 200 220 240 260 280 300
ﻣﺤﺎﺳﺒﻪ ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺩﺭ ﺷﺮﺍﻳﻄﻲ ﻏﻴﺮ ﺍﺯ ﺷﺮﺍﻳﻂ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ: ﺍﮔﺮ ﺟﺪﻭﻝ ﻓﻮﻕ ﺩﺭ ﺩﺳﺘﺮﺱ ﻧﺒﻮﺩ،ﻣﻲ ﺗﻮﺍﻧﻴﺪ ﭼﮕﺎﻟﻲ ﻫﻮﺍ ﺭﺍ ﺩﺭ ﺍﺭﺗﻔﺎﻋﺎﺕ ﺑﺎﻻﺗﺮ ﻳﺎ ﺩﻣﺎﻫﺎﻱ ﺧﻴﻠﻲ ﺯﻳﺎﺩ ﻣﺤﺎﺳﺒﻪ ﻛﻨﻴﺪ. ﺍﺯ ﺭﺍﺑﻄﻪ ﺯﻳﺮ ﺑﺮ ﭘﺎﻳﻪ ﭼﮕﺎﻟﻲ ﺍﺳﺘﺎﻧﺪﺍﺭﺩ ﻫﻮﺍ ) (0.075 lb/ftᶟﻭ ﺿﺮﺍﻳﺐ ﺗﺼﺤﻴﺢ ﺑﺮﺍﻱ ﺩﻣﺎ ﻭ ﺍﺭﺗﻔﺎﻉ ﺍﺳﺘﻔﺎﺩﻩ ﻛﻨﻴﺪ: 𝑇𝑇𝐶𝐶=ﺿﺮﻳﺐ ﺗﺼﺤﻴﺢ ﺩﻣﺎ ) (˚Fﺩﻣﺎ 𝐸𝐸𝐶𝐶=ﺿﺮﻳﺐ ﺗﺼﺤﻴﺢ ﺍﺭﺗﻔﺎﻉ)(ft
ﭼﮕﺎﻟﻲ = CE × CT ×0.075 530
(˚𝐹𝐹)+460ﺩﻣﺎ 1000 �−30 500
30
ﺑﺎ ﺗﺸﻜﺮ ﺍﺯ ﻣﺠﻠﻪ ﺍﺭﻭﻧﺪ33-
9
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= CT
�
= CE