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Additional resources for Building Energy and Environmental Modelling
It is important to note that differences in program predictions only become critical if they would result in different design decisions. High quality validation datasets for thermal simulation programs Type of test Description Name and reference Analytical verification Variation of temperatures and heat fluxes in opaque constructions due to simple changes in boundary conditions are compared with expected evolution of these quantities EMC analytical tests (6) Empirical validation Hourly heating energy demands and internal temperatures in intermittently heated and unheated single-zone spaces monitored for 10 days.
6 Spaces in a building can be grouped together into one zone if, for example: — they are likely to perform similarly without environmental controls — they have similar heating and cooling equipment and set-points — the internal gains from occupants, lighting and equipment are similar — the solar gains are similar. If the partitions separating spaces grouped in this manner have significant thermal mass, this should be included within the modelled zone. 8). For thermal models, it is recommended that modellers begin with idealised representations of possible flow regimes (specified air change rates), moving to the more explicit network and CFD representations where pressure or buoyancy-driven airflows dominate performance.
In large practices, the client may be a project manager from a different group. In either case, the role of the simulation manager will be broadly the same. 6 Role of the program user Area Work to be undertaken Devise simulation strategy Advise on program capabilities Advise on need for supporting software Agree sequence of simulations Agree assumptions to be made Agree use of databases Conduct simulations Assemble input data Exchange information with other program users Set up input files Check input data and results Analysing the output Discuss preliminary results Present results in a suitable form Recommend additional simulations needed Managing resources Recommend software and hardware upgrades Maintain archive of simulation results Build archive of in-house databases A program user, therefore, should possess: — the ability to interpret the manager’s brief as a sequence of simulations the ability to estimate costs and duration of modelling studies — experience in using computers — the ability to use the simulation program correctly the experience to anticipate the broad outcome of simulations.
Building Energy and Environmental Modelling by CIBSE