Net Zero Energy Building at CEPT University


    • Owner
    • CEPT University
    • Occupied In
    • 2015
    • Location
    • Ahmedabad
    • Building Type
    • Institutional
    • Occupancy
    • 20
    • Operating Hours
    • 10 hrs/day
    • Total Floor Area Unit
    • SQ. FT.
    • Air-conditioned Area
    • 416 sq.m
    • Grid Connectivity
    • Grid Connected and Solar PV
    • Building Name
    • Net Zero Energy Building at CEPT University

Project Team

    • HVAC Engineer
    • Pankaj Dharkar and Associates
    • Architect
    • B.V. Doshi

Building Design

    • Orientation
    • North-South direction
    • Window
    • UPVC frame with insulated double glazed unit (DGU) having 6mm low-e glass (VLT = 0.39)
    • Wall
    • 110mm thick exposed brick on outermost layer followed by 50mm XPS insulation and 230mm thick cement plastered brick masonry wall inside. U-value of wall = 0.42 W/sq.m.K
    • Roof
    • In-situ Reinforced Cement Concrete roof with 32% flyash content has a 45mm thick 50 kg/m3 rigid urethane foam insulation on top with 50mm concrete screed and white paint. U-value = 0.38 W/sq.m.K, Solar Reflectance of Rooftop Finish - 103
    • WWR
    • Overall WWR is 26%. Maximum opening is provided on the north direction having WWR of 90% and south direction has WWR of 10%.
    • Daylighting
    • South facing 30° inclined roof with 450mm high operable clerestories at two levels provide an opportunity for daylighting. The NZE building is designed to maximize daylight inside the building throughout the day/year to ensure minimal dependence on artificial lighting.


      Naturally daylit area of NZE Building, CEPT University


    • Artificial Lighting System
    • All lighting fixtures are energy efficient LEDs. A combination of ambient and task lighting provides the required illuminance for all the spaces. Task lights can be continuously dimmed (10-100%) as well as provide a change in correlated color temperature (CCT) of light.

    • Passive Cooling System
    • Radiant cooling is the primary cooling system. An air-cooled scroll chiller of 8.2 TR supplies chilled water to the radiant system.

    • Active Cooling System
    • The basement floor is supplemented by a Dedicated Outdoor Air System (DOAS) with a Heat Recovery Wheel and Digital Scroll Cooling for providing conditioned fresh air for peak cooling periods and latent loads.

      The first and second floors have 8 supplementary Variable Refrigerant Flow (VRF) units for peak cooling periods and latent loads. The VRF units are of 8TR.



    • Shading
    • Glass U-value = 1.7 W/sq.m.K

      Glass SHGC = 0.29

Building Performance

    • Renewables
    • Solar Photovoltaic system of 30 kWp capacity is installed on the south facing sloping roof.

      Solar PV installed on the south facing sloping roof.


Lessons Learned

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