Energy & CO2

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Energy and CO2

  1. What is the difference between CoP (Coefficient of Performance) and SPF (Seasonal Performance Factor - known sometimes as Seasonal Efficiency)?

    • CoP - Relevant Standards BSEN14511-2
      (CoP is Know as Coefficient of Performance)

      CoP is efficiency of a heat pump at set conditions and = Energy Output divided by Total Energy Input.

      BSEN14511-2 sets two levels for Air source (air-to-water) heat pumps:

      • Floor Heating or Similar (Fan Coils/Convectors) T. ambient DB/WB 7°C/6°C - LW 35°C (DT = 5°C).
      • Standard Conditions T. ambient DB/WB 7°C/6°C - LW 45°C (DT = 5°C).

      Daikin Altherma CoP's at these conditions: (CoP's can be expressed in Factor or % [Factor x 100])

      • At LW 35°C - CoP = 4.05 to 4.56 (or 405% to 456%)
      • At LW 45°C - CoP = 3.00 to 3.38 (or 300% to 338%) [Fossil fuel boilers max. 90%]

      LW = Leaving Water temperature, DT = Leaving - Return water temperature

      Important: You need to obtain confirmation that the product you use complies to BSEN14511.

      SPF - Relevant Standards BSEN15316-2-4
      (SPF is Know as Seasonal Performance Factor)

      SPF is the efficiency over a period (can be yearly, monthly or quarterly) and = period Energy Output divided by period Total Energy Input.

      This is based on daily or hourly energy output to match daily/hourly energy requirement measured at average daily/hourly ambient temperatures.

      Note: The daily/hourly average ambient temperature can vary depending on location e.g. Glasgow, Manchester, and Southampton. Therefore, it is wrong to generalise the seasonal performance efficiencies.

      Daikin Altherma simulation software from Space Air calculates the correct SPF based on location through available daily/hourly ambient data for over 73 postcodes throughout the UK.

      The Daikin Altherma with its inverter capacity control of up to 27 steps enables the accurate calculation of the energy consumption.

      Daikin Altherma typical SPF for heating can range between 300% to 440%.

      Calculation for the hot water requirements is a separate calculation, which is added to the energy consumption based on BSEN:15450.

  2. How much carbon footprint can I save by using Daikin Altherma?

    • Carbon footprint is a measure of carbon emissions based on energy consumption per kWhr and fuel type used ie, direct electric/oil/lpg/gas or electric heat pump. Daikin Altherma air source heat pump can save more than 46% of your average yearly CO2 depending on the fuel you use. Direct Electric 46%, Gas 12%, Oil 31%, LPG 24.4% CO2/kWhr.

      The emission of CO2 relates to the type of fuel used:

      • Mains gas (natural) emits 0.234 kg CO2/kWhr consumed
      • Oil emits 0.319 kg CO2/kWhr consumed
      • LPG emits 0.282 kg CO2/kWhr consumed
      • Electricity is generated in power stations that use gas, oil, nuclear and coal to drive the turbines hence it is calculated to be 0.422kg CO2/kWhr consumed. If electricity is generated by Nuclear (as in France) or Hydro (as in Norway) the emission from generation would be in the region of 0.032 to 0.003 kg CO2/kWhr.

  3. How much energy (kWhr consumed) can I save by using Daikin Altherma?

    • You can save over 46% of your average yearly household energy consumption (kWhr) by using Daikin Altherma for both your heating and hot water. (based on the UK average energy consumption from BRE/DTI 2003).

  4. How can I reduce my running costs further with Daikin Altherma?

    • By asking your electricity provider to supply you with an economy 7 or economy 10 meter. Economy 7 provides you with cheap rates at off peak times. (7hrs) Economy 10 provides you with 10 hours cheaper electricity. With this you can re-organise your other electrical consumption ie: your dishwasher, washing machine and/or tumble dryer to take even further advantage of running cost savings. Daikin Altherma will also operate more efficiently when paired with solar or UPV panels.