|
|
Low
|
High
|
Average
|
Cold Water Temperature (F)
|
|
Ground Water or Delivered to House
(Round to nearest number in chart)
|
40
|
60
|
50
|
| |
Hot Water Temperature (F)
|
120
|
160
|
140
|
|
At Water Heater
(Round to nearest number in chart)
|
|
|
Btu/Gallon
|
|
|
Smallest Temperature Difference
|
500
|
(Low Hot, High Cold)
|
|
Largest Temperature Difference
|
1,000
|
(Low Cold, High Hot)
|
|
Average Temperature Difference
|
750
|
(Average Cold, Average Hot)
|
|
|
Energy Costs
|
Natural Gas
|
Propane
|
Electricity
|
|
Cost
($/therm, $/kWh, $/gallon)
|
$1.00
|
$1.20
|
$0.10
|
|
Energy Content
(1Th = 100,000 Btu)
(1 kWh = 3412 Btu)
(1 Gal = 91,547 Btu)
|
100,000
|
91,547
|
3,412
|
|
Water Heater Efficiency
|
0.7
|
0.7
|
0.95
|
|
|
Water Costs
($/1000 gallons)
(748 gallons = 1 CCF) |
$5.00
|
Sewer Costs
($/1000 gallons)
(748 gallons = 1 CCF)
|
$5.00
|
|
|
Water Delivery System
|
|
Energy Savings
|
0.00091
|
kWh per gallon
|
|
|
$0.0000910
|
per gallon
|
|
Chemical Savings
|
$0.0000008
|
per gallon
|
|
|
Wastewater Treatment System
|
|
Energy Savings
|
0.002157
|
kWh per gallon
|
|
|
$0.00022
|
per gallon
|
|
Chemical Savings
|
$0.00003
|
per gallon
|
|
|
|
The energy savings are based on the Average Temperature
Difference. Energy and chemical savings for water delivery
and wastewater treatment are based on the Sacramento
area.
|
