1. Two identical fans are used in parallel with the dust collection system shown. Fan performance...
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1. Two identical fans are used in parallel with the dust collection system shown. Fan performance data are given below. The duct roughness is the same as cast iron. You may assume fully turbulent flow in each duct. If needed, the exhaust area of each fan is 2 ft2. Each of the two ducts shown is 100 ft long with turns giving K = 3.6 and a collection hood with K = 0.5. One of them is 14 in. x 24 in. The other is round with D = 20 in. The filter manufacturer nameplate says the pressure drop is 1.8 in. WG at the rated flow of 11,000 cfm. a) Find the total flow, flow in each duct, and horsepower for each fan. A curve fit of the FSP vs Q data shown is FSP= -4.375E-8Q2 + 1.475E-4Q + 2.905, and the efficiency fit is hs = 5.21E-11Q³ - 3.46E-06Q² +3.39E-02Q - 25.2. What is the pressure at the fan inlet, in. WG? b) c) What is the pressure at the fan outlet, in. WG? d) How must fan speed be changed to reduce flow by 15%? How will the values in (a), (b) and (c) change? Fan Data Q- cfm FSP - in. WG hs-% 0 2000 4000 6000 8000 10000 2.9 2.7 2.8 filter 2,2 1.3 0 29 59 64 52 20 1. Two identical fans are used in parallel with the dust collection system shown. Fan performance data are given below. The duct roughness is the same as cast iron. You may assume fully turbulent flow in each duct. If needed, the exhaust area of each fan is 2 ft2. Each of the two ducts shown is 100 ft long with turns giving K = 3.6 and a collection hood with K = 0.5. One of them is 14 in. x 24 in. The other is round with D = 20 in. The filter manufacturer nameplate says the pressure drop is 1.8 in. WG at the rated flow of 11,000 cfm. a) Find the total flow, flow in each duct, and horsepower for each fan. A curve fit of the FSP vs Q data shown is FSP= -4.375E-8Q2 + 1.475E-4Q + 2.905, and the efficiency fit is hs = 5.21E-11Q³ - 3.46E-06Q² +3.39E-02Q - 25.2. What is the pressure at the fan inlet, in. WG? b) c) What is the pressure at the fan outlet, in. WG? d) How must fan speed be changed to reduce flow by 15%? How will the values in (a), (b) and (c) change? Fan Data Q- cfm FSP - in. WG hs-% 0 2000 4000 6000 8000 10000 2.9 2.7 2.8 filter 2,2 1.3 0 29 59 64 52 20
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Related Book For
Accounting Information Systems
ISBN: 9780132871938
11th Edition
Authors: George H. Bodnar, William S. Hopwood
Posted Date:
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