Krakosky
Tank Ass
I was working an HVAC mixture problem and got it wrong. Very discouraging bc I was sure I knew how to do these types of problems. I'll list the problem and my approach below.
"An air handler that is equipped with a cooling coil receives 2,000 cu. ft/min of outdoor air that is maintained at 71 deg F and 50% relative humidity. The air is mixed with 4,000 cu. ft/min of outdoor air at 95 deg F dry bulb having a humidity ratio of 0.012 lb of moisture per lb of dry air prior to entering the cooling coil. The enthalpy of the mixture entering the cooling coil (Btu/lb dry air) is most nearly?
I found the enthalpy from the psych chart for the 2 conditions listed and then tried to use Eq. 38.21. Is this equation incorrect to use to find the change in enthalpy? I thought it could be used to find all the properties of a mixture as long as the mass or volumetric flow rates are known. Thanks for any input.
"An air handler that is equipped with a cooling coil receives 2,000 cu. ft/min of outdoor air that is maintained at 71 deg F and 50% relative humidity. The air is mixed with 4,000 cu. ft/min of outdoor air at 95 deg F dry bulb having a humidity ratio of 0.012 lb of moisture per lb of dry air prior to entering the cooling coil. The enthalpy of the mixture entering the cooling coil (Btu/lb dry air) is most nearly?
I found the enthalpy from the psych chart for the 2 conditions listed and then tried to use Eq. 38.21. Is this equation incorrect to use to find the change in enthalpy? I thought it could be used to find all the properties of a mixture as long as the mass or volumetric flow rates are known. Thanks for any input.