• CIBSE Gain Queries

    I have turned off infiltration, ventilation, occupants and casual gains from my model to test the solar load portion only. However I still see loads attributed with "Convective" and "Latent" (albeit small). Should these loads exist in my calculation…

  • CIBSE Gain calculation - Importance of accurate input data

    Product(s): Hevacomp Version(s): V8i Environment: N/A Area: Design Database Subarea: Results Overview Unusual results are likely to occur if Building model data is inadequate. Method Comprehensive…

  • RE: Window glazing properties, CIBSE Gain

    Hi Kenny, The different standards used by each Hevacomp calculation prescribe their own equations, each requiring their own particular variables. In the case of the CIBSE Gain calc the most important variables are the Solar Gain Factors. SHGC is not…

  • Limitations, assumptions and approximations of Hevacomp, particularly CIBSE Gain

    I am wondering if you could help point me in the right direction. I am wanting to better understand what are the limitations of Hevacomp in terms of the underlying assumptions and approximations that the software uses. I am mostly interested in the…

  • Very high CIBSE Solar Gains

    I modelled a simple 5mx5m glass box with no heat transfer across the floor or ceiling and I created a custom glass to replicate a Pilkington glass (U-Value of 0.6 and g-factor of 0.55). When I checked the solar gains using CIBSE Gains they were 10.8kW…

  • RE: CIBSE Gain - Results Breakdown

    Matthew, you have probably turned on Temperature Rise in the Design Data tab. When you use Temperature Rise the individual loads are combined in the underlying equations and cannot be accurately split out afterwards.

  • CIBSE Gain calculation - Solar gains at night

    Product(s): Hevacomp Mechanical Designer Version(s): V8i (N/A) Environment: N/A Area: N/A Subarea: N/A Overview CIBSE Gain results can often display Solar Gains at night, for example: Explanation…
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