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metric conversion help

  • 04-03-2013 12:43pm
    #1
    cobrajetken
    Registered Users, Registered Users 2 Posts: 1 ✭


    Air flowing in a duct has dry and wet bulb temperatures of 78F (25.6C) and 65F (18.3C), respectively. Use Psychrometric charts in English units (chart 1a) and SI unirs (1b) attached to find enthalpy,specific volume, humidity ratio and relative humidity in English and SI units. I found these points on the attached charts. I found these points on the two charts and the corresponding values asked for. The enthalpy for 78Fdb and 65F wb is found to be 30 BTU/lb and on chart (b) enthalpy for 25.6Cdb and 18.3Cwb as 52 kj/kg. When I convert specific volume from English to SI I find 13.56 cubic feet per pound equals o.86 cubic meters per kilogram. However, when I convert enthalpy in English units (30 Btu/lb) to SI I get 68 kj/kg which is way off from what I got on the SI chart 52 kj/kg). I racked by brain but I'm stumped. I'm missing something here and I'm not seeing it. Could you help me with this dilemma? Thank's. Ken
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