Distric Energy System

Dear all, Currently we are working on an industrial facility pursuing LEED 2009 NC – Major Renovation certification. The building consists of 3 levels. The top 2 will be completely refitted (envelope and systems), whereas the ground level with not be altered. The project building is supplied by a Central Plant, which also supplies a second building. As the plant is not located in the project building, it needs to be considered as a DES plant. The team decided to use the performance path (energy modeling) and DES Option 1 (stand-alone scenario) to achieve compliance under EAp2 and EAc1. A Waste Heat Recovery System will be part of the project building’s thermal conditioning strategy. This system recovers heat from the industrial process machines (located in 2nd and 3th level of the project building) and brings it back to the Central Plant, where is used to cover the building´s heating demand. The recovered heat has been taken into account for the dimensioning of heating and cooling ventilation rates and power requirements in the project building. 1. Should the Waste Heat Recovery System be considered as Downstream or Upstream? If this is considered as Upstream, how should the Removed Heat be taken into account? Could the equipment loads, which are removed by the Waste Heat Recovery System, simply be deducted from the total equipment loads when inputting internal gains? 2. In the project building, a new AHU supplies the 2nd and 3th levels, but the 1st level is supplied by an existing AHU which also partly supplies the second building. How should the already existing AHU be taken into account? Should only the relevant partial capacity be considered? Thanks