A computational fluid dynamics (CFD) program based on a zero-equation turbulence model is used to simulate the microclimate in a model office ventilated by desk displacement ventilation (DDV). DDV is a new ventilation concept that intends to combine the positive features of displacement ventilation and local task ventilation. The CFD model correctly predicts both the thermal plume and temperature stratification, and the calculated air temperature distributions agree with the measured data. The pollutant concentration distribution is further simulated to evaluate the microclimate of DDV. Results show that despite rather large discrepancies between simulated velocity distributions and experimental data, the zero-equation turbulence model may simulate the main characteristics (thermal plume, temperature, and qualitative velocity tendency) of DDV more quickly than other commonly used models, for instance, the k-ε model, and thus may be applied to similar cases in indoor environment design.

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