using the taco_hydronics_step_by_step.pdf document online to do a heat loss calculation on my house.
i figured i'd do a rough estimate first and it comes out way low. I thought it would be a worst case scenario since i'm over-estimating. tell me what you think and what i'm missing.
house is colonial-style, a 34' x 24' rectangle inside overall. two living floors, the bottom/basement floor is a half finished basement then utility room then 2-car garage. 8 foot ceilings. i re-sided house couple years ago with all new vinyl energy-efficient windows.
U = 1 / R ( R = rated value of insulation)
infiltration loss (BTUH) = (cubic feet) x (DTD deg F) x (infiltration_factor).
conductance heat loss (BTUH) = area x DTD x U
32' x 24' x 8' = 6144 ft^3 for each floor , 12288 total ft^3
four outside walls per floor total area = 896 ft^2
total outside wall area = 1792 ft^2
total window area = 187 ft^2
front/back door area = 40 ft^2
ceiling/floor area = 768 ft^2
infiltration loss = 12288 * 70 * .3 = 26000 btuh
conductance total wall = 1800 * 70 * .08 = 10000 btuh (didn't subtract window area)
ceiling/floor = 800 * 70 * .1 = 5600 btuh
window loss = 200 * 70 * .4 = 5600 btuh
front/back door = 40 * 70 * .4 = 1120 btuh
sum < 50,000 btuh
is this correct?
that's for calculating based on having inside temp at 70 degrees F with outside at 0.
winter temps are generally 20-40 F.
thinks its worth buying a new boiler since my 20 year old one is rated at 103k btuh d.o.e. ?
i figured i'd do a rough estimate first and it comes out way low. I thought it would be a worst case scenario since i'm over-estimating. tell me what you think and what i'm missing.
house is colonial-style, a 34' x 24' rectangle inside overall. two living floors, the bottom/basement floor is a half finished basement then utility room then 2-car garage. 8 foot ceilings. i re-sided house couple years ago with all new vinyl energy-efficient windows.
U = 1 / R ( R = rated value of insulation)
infiltration loss (BTUH) = (cubic feet) x (DTD deg F) x (infiltration_factor).
conductance heat loss (BTUH) = area x DTD x U
32' x 24' x 8' = 6144 ft^3 for each floor , 12288 total ft^3
four outside walls per floor total area = 896 ft^2
total outside wall area = 1792 ft^2
total window area = 187 ft^2
front/back door area = 40 ft^2
ceiling/floor area = 768 ft^2
infiltration loss = 12288 * 70 * .3 = 26000 btuh
conductance total wall = 1800 * 70 * .08 = 10000 btuh (didn't subtract window area)
ceiling/floor = 800 * 70 * .1 = 5600 btuh
window loss = 200 * 70 * .4 = 5600 btuh
front/back door = 40 * 70 * .4 = 1120 btuh
sum < 50,000 btuh
is this correct?
that's for calculating based on having inside temp at 70 degrees F with outside at 0.
winter temps are generally 20-40 F.
thinks its worth buying a new boiler since my 20 year old one is rated at 103k btuh d.o.e. ?
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