Talking about a VRF HVAC system. Is it a mandatory requirement that the VRF condenser and evaporative units must be ARI Certified, according with the Standard 90.1-2007?

Hi All, I am modelling a VRF system using ApacheHVAC in IES. But have no idea which prototype to choose.

Hello I'm working in a energy simulation of a medical clinic, where it is possible to make some types of exams and diagnoses, but it doesn't have spaces like intensive care or surgical areas.

I recently received LEED review comments regarding the treatment of incomplete space in an energy model for a proposed new construction building.

ASHRAE 90.1-2007 mentions that for the Proposed case automatically controlled fenestration devices or shades may be modeled, but manually controlled shades should not be modeled.

My read on ASHRAE-90.1 and numerous forums, is that USGBC may allow for an exceptional calculation to be performed for elevator energy savings, provided that; 1) Schedule of operation remains the s

Dear all, I have a suspended ceiling with a 60 cm air gap between the panels and the reinforced concrete slab where all the electro-mechanical lies, but it doesn't act as plenum zone si

I have a project that is considering using the Core Performance Guide option for compliance with this credit.

If a new building will be served by an existing chiller plant that already serves an existing building, does the Plant design for the Proposed Alternative need to model the full chiller size, even