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eml 3100homework 1 2010

eml 3100homework 1 2010 - EML 3100 Homework No 1 Due Friday...

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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 50 indoor design conditions 95 78 Gainesville outdoor design 32 30 winter outdoor design 85 65 mixed air conditions typical 75 56 55 53 cooling coil leaving cond. 105 50 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? 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. Find the following mixed air conditions:

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eml 3100homework 1 2010 - EML 3100 Homework No 1 Due Friday...

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