What guidelines should be used for district thermal energy systems in v4 when using option 1, specifically combined heat and power systems?

The 90.1-2010 User's Manual states: "In some cases, a complete HVAC system already exists (...) the proposed building and baseline building models are the same and are based on the existing HVAC sy

Since the energy model is based off of an existing building.

Markus, thanks again. Since the English is not my mother tonge, sometimes I'm geting confused by enterpreting some explanation although I'm already 37 years in the HVAC branch.

I may have helped you, now its your turn to help us all. The USGBC is seeking input and information related to the modeling of naturally ventilated and naturally conditioned buildings.

Does anyone have a link to a concise list of the differences between 90.1-2007 and 90.1-2010?

Greetings, In the IEQp1 calculation form, provided by USGBC for using in LEED v4, in the Occupancy Category pull-down menu, there is nothing related to equipment rooms, non-occupied stores and sim

For chillers in EnergyPlus I have to provide the data “Minimum Unloading Ratio”.

I am modeling a new building(Laboratory/office) on a university campus following LEED v4 Option 1, Whole Building Energy Simulation. New Building is 3 story and 69,500 sq.ft .

Is there any new guidance or published changes for modeling district energy loops in LEED v4?