sustainable home

climate control
definitions
Quantity
CFM: cubic feet per minute, flow rate
Energy
Watt-hour (Wh): a measure of electrical energy equivalent to a power consumption of one watt for one hour
British Thermal Units (BTU): amount of energy necessary to raise the temperature of one amount of water from 60F to 61F
MBH: thousands BTU’s per hour
Efficiency:
Coefficient of Performance (COP): ratio of thermal output (heating or cooling) to energy input
energy modeling
Yearly weather profile
Operating schedules
Building envelope conditions
% savings=1-SEERcurrentSEERcurrent*100%
*only applies if rated cooling output and operating schedules remain the same after upgrade, otherwise energy consumption in kWh must be calculated separately for existing and projected running conditions
air conditioning
types
Coolant
R-410a: new standard, more efficient, no ozone damage, higher pressures (requires tougher, more durable parts, increasing life of system)
R-22 (freon): old standard, illegal in any system manufactured after 2010, no longer imported or manufactured after 2020. Less energy efficient (heat transfer), contributes to depletion of ozone, rising prices.
Metrics
Efficiency: ratio of cooling output (BTU) to heating input (watt-hours) (unit = BTU/Wh)
Energy Efficiency Ratio (EER): fixed set of operating conditions (Tindoor = 80F, Toutdoor = 95F, relative humidity = 50%)
Seasonal Energy Efficiency Ratio (SEER): averages performance across a range of outdoor temperatures typical of the cooling season.

Degradation
Estimated Capacity: BTU/Hr
US DOE: 3% degradation for unmaintained, 1% for completely maintained systems
Florida Test: median 5.2%
degradation=-0.0454+0.00269(Age)+0.030(Tons)-0.00127(SEER)
Degradation = -0.0454
heating
Metrics
Efficiency:
Heating Seasonal Performance Factor (HSPF): analogous to SEER, applies for heat pumps in heating mode only
SEER: describes heat pumps during cooling season
Annual Fuel Utilization Efficiency (AFUE): used for combustion-based appliances (boilers, furnaces), ratio of effective heating output to total energy contained in the fuel consumed

recycling
plastic film
composting
can pick up your compost for you (residential or commercial), $30-45 per month
Sources
home air conditioning.xlsx
12.3 kB
home cooling infographic.png

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