01 Heat Recovery Ventilation (HRV)
02 Sustainable heating systems
03 Sustainable cooling systems

01 Heat Recovery Ventilation (HRV)

index

double flow ventilation

Common to install when:
- Extreme climate zones (arctic, cool, very warm)
- Noise pollution areas
- Air pollution areas
- Allergic people

System choose criteria

source:ClenFilter

minimum F7 for fresh outdoor air inlet
minimum G4 for exhaust air from local

hygiene

confort

0 °C = 273,15 K

Source: Gjennestad, Magnus & Aursand, Eskil & Magnanelli, Elisa & Pharoah, J.G.. (2018). Second-law energy efficiency as performance indicator for heat and energy recovery ventilators.

Requirements
- Min. Outdoor temperature 16,5ºC a -10ºC
- Simultaneity (30%-70%-100%-130%)
- Noise control. Max. 35 dB(A) inhabited rooms

efficiency

- efficiency coefficient, η≥75%
- energy demand≤0,45 Wh/m3
- energy saving mode max. 1W
- airtight and insulation
- air balance between fresh outdoor air and exhaust air

frost protection

membrane HRV

what if HRV is insufficient?
we need to install supplementary heating and/or cooling systems

02 Sustainable heating systems

03 Sustainable cooling systems

cooling demand< 150 Wh/m2d

cooling demand < 250 Wh/m2d -> aerothermal, geothermal

cooling demand > 250 Wh/m2d -> chilled ceiling/beams, cooling towers

depends of the demand, and combine it with passive strategies (shading, solar protections)

do you already know any of them?

Comparison of delivered energy in conventional house and in house built to Passivhaus Standard.
Source: Passivhaus Institut. http://www.passiv.de.

Source: Building Energy Exchange

traditional heat pump

aerothermal heat pump

geothermal heat pump

biomass

also provides cooling

ventilation is enough

traditional air conditioned machines contain high pollutant refrigerant

Always try to find refrigerants with lower Global Warming Potential (GWP)

GWP is a relative way to measure the amount of greenhouse gases that traps in the atmosphere

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gas radiator (uncertain prices in the future)

cooling tower