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Eco-Duplex for Pearson Maraj


Where:

Edmonton, Alberta, Canada

What:

Power Ecosystems was approached to provide a highly energy efficient heating and power unit for an eco-rrrendly duplex development, featuring state-of-the-art equipment that would ensure the duplex was green aspossible The cogenerating / CHPsystem produces over 32,000 BTU of heat per hour, while simultaneously producing SkWof electricity to power the home.

The Home:

The Eco-Duplex features state of the art systems including the CHPsystem. passive solar design, solar thermal and photovoltaic ready components, high density, airtight foam insulation, glazed quad pane fiberglass windows. concrete floors with in-floor heating. LED lighting throughout, low flow faucets and toilets, rainwater collection tank, grey water ready components and three energy return ventilators to ensure fresh,clean air throughout the house.

Purpose:

The builders focus for the Eco-Duplex was energy efficiency while not detracting from the comforts of luxury living. The CHP system provides agreen source of electricity, decreasing green house gasemissions by approximately 20 tormes per year, the equivalent of removing four cars from the road. However, the system does more than just reduce the carbon footprint of the home, it will also save the owners nearly 68% on their space and hot water heating costs (compared to aconventional systems three year average).

Primary reason for choosing Power Ecosystems:

No larger than aconventional home furnace. The Cummins/Power Ecosystems CHP system was the ideal size for the Eco-Duplex. Forover 11years, these CHP systems have solved heating and electrical generation needs with a proven track record and very low maintenance costs. Over 4000 locations nationwide have used this CHP system.


The Case Study

How It Works

At the heart of the combined heat and power cogeneration system isa natural-gas electric generator connected to the homes energy grid. When heat is required for domestic hot water or space heating, the generator comes on and creates electricity. Heat. as a by-product of electrical generation, is collected and used to warm the house and water. If the house needs electricity when the generator is not running, then it buys power from the grid.

Located in the garage, the generator remains out of the way ensuring the best use of livable space. When heat is needed, hot collection fluids are piped underground in a super-insulated pipe to the house, where they are stored in a collection tank. This collection tank stores the heated liquid until heat is needed in the house. In-floor radiant heat coils distribute the heat throughout the house.

With the large thermal mass of the Eco-Duplex, radiant solar heat is combined with heat generated by the CHP system and stored in the concrete floors to ensure maximum energy efficiency. Super insulation and quad pane windows keep the heat in place and reduce demand on the CHP system.

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ECONOMICS

Economic Benefit Calculations

Current Customer Energy Costs:
Electricty:$.14/kWh
Natural gas:$8/GJ
@ 5 year fixed price contract



Output
Electricity output of CHP:5 kW/h
Heat output:9.6 kW/h



Capital Cost of the Project
Total Cost:$37,034.00
Maintenance:$0.18 kW/h
Estimated Current Hot Water heater and boiler efficiency:60%

Conventional Cost:

Value of electricity:

5 kW @ $.14/kWh = $0.70

Heat Displaced:

9.6 kW/hr = 0.036 GJ @ 60% efficiency

Value of heat:

0.06 @ $8.00/GJ = $0.48

Total: $1.18

CHP Cost:

Fuel for CHP:

0.06 GJ @ $8/GJ = $0.29

Maintenance:

5 kW/h @ $.018/kWh = $0.45

Total: $0.38/hour

Total savings: $0.80/hour

(GHG) potential:

20 tonnes/year @ $18/tonne = $360.00/year

Total savings per year:

$0.8 X 7,884 operating hours (Sept to June)

plus GHG = $6,322.97

Simple payback on a unit purchase: 5.86 years