Experimental and theoretical investigation about the effect of nano-coating on heating load


Building insulators reducing the natural gas required for interior heating or heating load reduction, have a positive impact on energy saving. Paints containing nano-silica aerogel can be applied as façade coatings and building insulators. In this study, the heating load was assessed for a building in a Mediterranean climate. Acrylic paint containing nano-silica aerogel was used as façade coating. The purpose was obtaining the performance of nano-paint on the reduction of heating load for the building. A model was developed to evaluate the amount of building heating load with and without the nano-paint. Nano-coated façade showed reductions in heating load compared to that façade without nano-coating. In addition, a stable heating load requirement was obtained after applying nano-paint, despite changes in the climatic conditions. Thermal insulation and water repellent properties of the paint containing nano-silica aerogel were important to reduce heating load requirement. Therefore, nano-paint containing silica aerogel was a cost-effective modification for façade which introduced a promising passive method to reduce heating load requirement in the buildings.

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A w :

Exterior wall surfaces (m2)

A g :

Window surface area (m2)

A f :

Floor surface area (m2)

c pa :

Air thermal capacity (J/kg K)

h o :

Ambient convective heat transfer coefficient (W/m2 K)


Heating degree days (°C)


Heating load (kWh)

I :

Solar Radiation (W/m2)

k :

Thermal conductivity (W/m K)

L :

Thickness (m)


Net calorific value of gas (Tj/kg)





P f :

Perimeter of floor (m)

Q el :

Excess losses (Wh)

Q fla :

Heat loss from floor to the underground water (Wh)

Q flb :

Heat loss from floor to the ambient (Wh)

Q gl :

Heat loss from windows (Wh)

Q il :

Heat loss trough infiltration (Wh)

Q ol :

Other estimated losses (Wh)

Q T :

Total heat loss during a day (Wh)

R :

Thermal resistance (m2 K/W)





T co :

Comfort temperature (K)

T a :

Ambient temperature (K)

T am :

Average ambient temperature in a month (°C)

T sur :

Surrounding temperature (K)

t :

Time (h)

U :

Coefficient of transmission(W/m2 K)


Volume of consumed gas (m3)




Calculated value






Gypsum plaster




Practical value



α :

Absorption coefficient

η :

Boiler efficiency

ε :

Emissivity factor

ω o :

Wind velocity (m/s)

ρ a :

Air density (kg/m3)


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Correspondence to Bizhan Honarvar.

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Farahmand, S., Honarvar, B., Mowla, D. et al. Experimental and theoretical investigation about the effect of nano-coating on heating load. Int J Ind Chem 11, 147–159 (2020). https://doi.org/10.1007/s40090-020-00209-x

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  • Heating load
  • Nano-paint
  • Silica aerogel
  • Modelling
  • Building complex
  • Acrylic paint