eml 3100homework 1 2010 solution

# eml 3100homework 1 2010 solution - EML 3100 Homework No 1...

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EML 3100 Homework No. 1 Due Friday May 28, 2010 1. Complete the following table: Tdb Twb %rh v w h Tdp deg F deg F ft3ma grain s btu deg F lbmda lbmda lbmda 75 62.55 50 13.68 64.65 28.11 55.2 indoor design conditions 95 78 47.3 14.36 117.4 41.3 71.8 Gainesville outdoor design 32 30 79.4 12.45 20.95 10.89 26.3 winter outdoor design 85 65 33.6 13.92 60.2 29.85 53.3 mixed air conditions typical 75 62.8 51 13.68 65.97 28.3 56 55 53.8 93 13.15 59.8 22.47 53 cooling coil leaving cond. 105 87.38 50 14.79 169.7 52.06 82.6 heating coil leaving cond. db = dry bulb dp = dew point wb = wet bulb ma= moist air da = dry air 2. Outdoor air at 35 deg Fdb and 28 deg F wb enters a heating coil at a rate of 6500cfm. The air is to be heated to 105 deg F. What is the rate at which heat must be added to the air by an electric heating coil to achieve this condition (btu/h)? Usually electric heating coils are rated by their heating capacity in kW. What would be the rating for this coil? 6500 cfm * 1.08 *(105-35) = 491,400 btu/h or 491,400/3,412= 144 kW 3. An air handling unit is used to condition a mixture of air. 3000 cfm of air at 97 deg F db and 78 deg Fwb are mixed with 20,000 cfm of air at 78deg Fdb and 50% rh.

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