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Heat loss calculations, looking for some help here.

  • 02-07-2017 10:14am
    #1
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,888 ✭✭✭✭


    Doing some heat related pipe run calculations so would like someone to check my maths please: am on probation in a new job so more than LC points at stake!.

    Details
    100m run
    nominal pipe diameter 50mm which will do so no need for ID calcs
    Use 3.1417 as "Pie"
    Part A
    So how many litres of water does that hold: my answer 0.196356 m3
    or 196.3 litres or 193.6 kg [ 1:1 is close enough]
    Part B
    What is the energy required to heat this volume of water from 20 degrees C to 85 degrees C.
    Use SHC 4.184 kJ/kg
    My answer in kJ is 53,401 kJ or 14.834 kWh, ignoring heat losses during heating.

    Thanks as always

    “I can’t pay my staff or mortgage with instagram likes”.



Comments

  • #2
    corglass
    Registered Users, Registered Users 2 Posts: 1,113 ✭✭✭corglass


    A is correct.

    B is 53.401 kJ not 53,401 kJ

    The kWh figure is incorrect as units of time not referenced in question do leave that out.

    On a technicality the SHC should include a /C symbol.


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