Heating this Building up With Cool Technology Mark T. Weber May 9th, 2013
Baseboard Heaters • Advantages: • Easy to install • Easy to maintain or replace • Heat only areas needed • Disadvantages: • Least efficient type of heat available • Dangerous • Uses natural convection to circulate heat
Mini-splits • Advantages: • Easy to install • Easy to maintain or replace • Heat only areas needed • Use ¼ to 1/3 electricity of baseboard heaters • Uses fan to circulate heat • Disadvantages: • More expensive to purchase and install
Mini-splits Typical indoor unit
Phase one: • Inventorying the existing heating system. This includes location, wattage, and space use, i.e. office, conference room, and hallway. With this data we can estimate the amount of time each unit is in use and from that, estimate the current and projected annual cost and savings of heating the College Center. • Design an efficient, new heating system using mini-splits. Data from the inventory (location, wattage, and use) will be used. • Locating possible sources of funding from Federal, State, and Local sources. • Writing a final report of findings and gaining approval and buy-in from Sustainability, Capital Projects, and College Council committees and presenting to the E-team for final approval.
Mark’s SWAG estimate • With baseboard heaters • 75 baseboard heaters @ 2KW each • On 12 hours per day, 25 days per month for 8 months = 360,000 KW/h per year • At 8 cents per KW/H = $28,800 per year to heat College Center • Using Mini-splits (Using a COP of 3) • On 12 hours per day, 25 days per month for 8 months = 120,000 KW/h per year • At 8 cents per KW/H = $9,504 • Using Mini-splits (Using a COP of 4) • On 12 hours per day, 25 days per month for 8 months = 90,000 KW/h per year • At 8 cents per KW/H = $7,200
Mark’s SWAG estimate Savings (with COP of 3): Baseboard heaters - $28,800 – 360,000 KW/H Min-splits - $9,504 – 120,000 KW/H Savings of $19,300 – 240,000 KW/H Capital cost to provide comparable heat using mini-splits = $150,000 7.7 year payback period City of Seattle average home uses 18,500 KW/H per year 40% higher than national average 240,000 KW/H / 18,500 KW/H = 13 average homes