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Zero Energy House

  • Establishment of an energy-saving building introduction roadmap(6th Green Growth Korea, 2009.11)* 15% reduction compared to ‘09 (’12)  →  30% reduction (’17)  →  60% reduction (’20)  →  Zero Energy Mandatory (’25)
  • Establishment of zero-energy target for new buildings in 2025
  • 2009
  • 2012
  • 2017
  • 2025
제로에너지 하우스 사진
  • Regular house
    as of 2009
    70mm Thermal insulation
    Double layered windows
    High efficiency boiler
  • Low energy
    consumption house(50% reduction)
    150mm Thermal insulation
    Triple layered window
    Heat exchange ventilation
  • Passive house(90% reduction)
    250mm Thermal insulation
    Ultra-efficiency window
    LED lights
  • Zero energy house(Zero energy consum)
    250mm thermal insulation
    Vacuum insulation
    LED lights
    Renewable energy

Heating and cooling load characteristics of zero energy houses

Heating and cooling load characteristics of zero energy house
  • Improvement of thermal insulation and air-tightness to reduce energy loss
  • Mechanical ventilation required due to improved air-tightness
  • If heat is not recovered, the ventilation thermal load occupies 50% or more among the total load
  • When the temperature effectiveness is 80% and the humidity effectiveness is 20%, the total energy recovery effectiveness in the heating condition becomes 65%, whereas in the cooling condition, it becomes only 49%
  • Increase of latent heat load among the total cooling load (SHR is decreased from the typical value 0.8 to less than 0.6)
  • Significant decrease in external thermal load to 1/5 or less
  • Suitable treatment of ventilation thermal load becomes more important due to the reduction in the portion of external load
  • With conventional plate type exchangers the energy recovery effectiveness is low especially in summer when the portion of latent heat is high due to the inefficiency in the moisture recovery
  • Due to the poor recovery of moisture in summer, the room is humidified and thus becomes damp with the ventilation
  • Increase in the latent load involves the dehumidification demand
  • To increase dehumidification, the surface temperature of the cooling part of air conditioner must be lowered.
  • Air conditioner efficiency decreases by more than 30% due to the temperature drop of the cooling part
  • Excessive temperature drop causes the room to become uncomfortably cold
  • Same effect can be observed during rainy season