For your project you will calculate the peak heat loss, the balance point temperature, and estimate the building annual heating costs, using methods outlined in Sun Wind & Light.
- Using Method #15 from Sun, Wind and Light, calculate the skin heat flow in BTU / (hr – sf – deg F)
- Using Method #17 from Sun, Wind and Light, calculate the ventilation or infiltration gain/loss in BTU / (hr – sf – deg F)
- Determine your total conductive heat flow in BTU / (hr – deg F). To do this, add the results from #1 and #2 above together, and multiply by your building floor area.
- Using your peak winter design conditions, estimate the maximum heat loss in Btu/hr. To do this:
Q= #3 x (Ti-To)
- Estimate your heat gains from occupants, lights, and equipment, using Methods #12, #13, #14 from Sun, Wind and Light. Your result should be in BTU/(hr-sf)
- Using Method #22 in Sun, Wind and Light, calculate your balance point temperature in deg F. Explain what your result tells you.
- Find the number of heating degree days for your project. (Use the appendix of SWL, or information you have already gathered.) If your heating system has an AFUE of 85%, and natural gas costs $1.50 per 100,000 BTU, find the total annual heating cost for the building, using the equation:
Cost = ($ x K x HDD x 24 )/ efficiency
Where K = total heat flow in BTU/ (hr – deg F) (i.e. the answer to #3 above)
2 comments:
Am I correct in following the assignment when I disregard heat gains from occupants, lighting, equipment and solar in order to estimate the total heating costs for the building for the year?
Yes
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