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Cool-Wall Coating: Comparative Energy Study

Two identical EnergyPlus models of a Riyadh office, differing only in wall-finish optics: 33.4 °C off the peak wall temperature and 12,040 kWh of wall heat gain removed a year.

LEED & green buildingMechanical
Chart: peak wall surface temperature by façade, conventional paint against the cool-wall coating.

At a glance

Client
Alhaleef Company
Location
Riyadh, KSA
Climate
Riyadh · TMYx weather file
Engine
EnergyPlus V25.1.0
Reference building
3-storey office · 1,800 m²
Product
JOTEX THERMOWALL PRO (white, A+B system)
Scope
Comparative energy simulation

Outcome

33.4 °C

Lower peak wall surface temperature

West façade, 81.7 → 48.2 °C.

12,040 kWh

Wall heat gain removed per year

+9,457 → −2,582 kWh/yr.

3.65 %

Less cooling electricity

Code-insulated case: the conservative one.

The brief

A manufacturer needed independent, reviewable evidence of what its cool-wall coating does to a building in the Saudi climate, not a brochure claim.

What we delivered

  • JOTEX THERMOWALL PRO (white, A+B system) against conventional exterior paint
  • Two identical models that differ only in wall-finish optics: solar reflectance 0.866 (CEPT-tested) against 0.25
  • 10-minute timestep on an SBC 601-compliant wall (U 0.32 W/m²K)
  • Walls turn from a net heat gain of +9,457 kWh/yr into a net heat sink of −2,582 kWh/yr
  • Zero severe errors on both runs; every figure traceable to the locked inputs register
  • Reported as the conservative case: savings scale up on older, less insulated buildings
Case study · energy simulation

Cool-wall coating: peak wall surface temperature by façade.

Two identical EnergyPlus models of a 3-storey, 1,800 m² office in the Riyadh climate. The only difference is the wall finish: solar reflectance 0.866 (CEPT-tested) against 0.25.

North 56.0 43.4
South 73.3 43.0
East 72.1 43.0
West 81.7 48.2

Walls turn from a net heat gain of +9,457 kWh/yr into a net heat sink of −2,582 kWh/yr on an SBC 601-compliant wall (U 0.32 W/m²K), 10-minute timestep. Reported as the conservative case: savings scale up on older, less insulated buildings.

Quality gates on every study

Nothing in the report has to be taken on trust.

  1. Gate 1 Inputs locked in a client-confirmed register before the first run
  2. Gate 2 Models validated against the engine schema with zero errors
  3. Gate 3 Runs accepted only when they complete with zero severe errors
  4. Gate 4 Independent analytical cross-check of the dynamic result
  5. Gate 5 Every reported figure re-extracted from the output database by script

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