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Calculation and evaluation basis for the dynamic operation of ventilation systems, consisting of air handling units (conditioning) and duct network (distribution) for increasing energy efficiency in part-load operation

Project details
Project term
December 2018 to November 2022
Funding code
BMWi 03ET1606A
Project management
Karsten Tawackolian

The overall objective of the project is the creation of calculation and evaluation bases for the dynamic operation of ventilation systems consisting of ventilation systems (air handling unit, air conditioning system) and the duct network (air distribution system). In partial load operation of ventilation systems, the following two effects must be investigated in this context:

  • On the one hand, the operating point of the AHU is shifted. This has an influence on the efficiency of the fan.
  • On the other hand, the pressure loss of the duct system changes. It is already known from the EnEff:Luft project (promotional reference 03ET1223) that resistance coefficients of duct network components depend on the velocity.

These two points are currently not taken into account in practice. Usually, the ventilation systems are designed and optimized for the full load operating point. As most ventilation systems operate for most of the time at partial load, this procedure leads to unfavorable operating behavior in terms of energy use, since firstly the pressure loss of the duct network is unknown and secondly the fan and the components of the ventilation system do not run at the optimum operating point. Therefore, both the air conditioning system and the air distribution system are to be examined for optimal operation under partial load boundary conditions.

In a first subproject, the individual components are optimized for partial load behavior in order to enable energy-efficient operation, especially in the partial load range. Using the further developed individual components, energy and economic overall system considerations with different user behavior and location conditions are conducted on an annual basis under dynamic boundary conditions in the second subproject. A web-based planning tool with the results is made available to the general public. Finally, in the third subproject, all findings are combined in a demonstration system, whereby a comparison between standard ventilation systems and part-load-optimized ventilation systems is established using cloud-based monitoring and control concepts and additionally, new possibilities for operational monitoring, maintenance, commissioning and optimization are researched.






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