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New simulation tools usable in the energy audit of HVAC systems

Publication Date
  • Engineering
  • Computing & Technology :: Energy [C07]
  • Ingénierie
  • Informatique & Technologie :: Energie [C07]
  • Design
  • Engineering


BPS2008_PaperULG_SBJL080904 New simulation tools usable in the energy audit of HVAC systems Jean Lebrun1* and Stephane Bertagnolio1 (1) Thermodynamics Laboratory University of Liège Sart Tilman Campus B49 (P33) 4000 Liège, Belgium *corresponding author: [email protected] Keywords: Benchmarking, audit, simulation 1. INTRODUCTION Early developments of simulation tools were mostly oriented towards supporting system design, i.e. mainly the selection and sizing of HVAC components. The usefulness of simulation tools in further stages of the building life cycle appeared later, among others with the apparition of friendly engineering equation solvers and of reliable simulation models. Energy simulation may help all along the building life cycle, from early design until last audit and retrofit actions. Building and HVAC simulation models should therefore be continuously available, but in different forms, according to what is expected from the simulation and according to the information actually available. Today, the simulation bottleneck is no more the computer, but the understanding of the user. Simulation models have therefore to be designed in such away to make easier this understanding. Hopefully the equation solvers presently available (Klein and Alvarado, 2002) open the way to the development of fully transparent and fully adaptable simulation models, with all equations written as in a text book. This means that a simulation program, its user guide and its reference guide can be combined into only one file, fully readable and directly executable. 2. USE OF SIMULATION TOOLS FOR ENERGY AUDITING Everybody agrees on the urgent necessity to submit existing HVAC systems to a careful energy audit, but nobody has yet a clear idea of how this task might achieved. Audit is required, among others, to identify the most efficient and cost-effective Energy Conservation Opportunities (ECOs), consisting in more efficient use or in (partial or global

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