Combined heating & cooling - Heat pump - Air-source - House

Template assignment

Base case

• Heated and cooled floor area for building is 150 m²
  
• Heating exclusively by oil furnace with efficiency of 75%
• Cooling fuel type is electricity
• Heating load for building is 60 W/m²
• Cooling load for building is 35 W/m²
• Air conditioners have a seasonal COP of 3.0
• Heating oil #2 (diesel) rate is $0.85/L; electricity rate is $0.07/kWh

Proposed case

• Dual source heating: air-source heat pump and oil furnace, resulting in a lower electricity tariff
• Better controls included with the new system results in a 10% energy saving for both heating and cooling
• Central cooling by air-source heat pump with seasonal COP of 4.0
• A 2 ton (7 kW) air-source heat pump costs $4,200 installed
• Heat pump heating capacity is 3.2 kW
• Air-source heat pump seasonal COP of 2.0 for heating
• Base load heating is provided by the heat pump, and electricity rate is $0.05/kWh
• Peak load heating is provided by the oil furnace
• As a first approximation, one can assume that around 20% of the annual heating is provided by the furnace
• Operation and maintenance costs essentially the same as in base case

Solution

The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.