Influence of air inlet/outlet arrangement of displacement ventilation on local environment control for unearthed relics within site museum

Displacement ventilation system is a proven way to save energy by controlling the local preservation environment for the unearthed relics in site museums. In this study, the influences of air inlet/outlet arrangement as well as the earthen site temperature on the performance of the local environment control system were investigated. The results demonstrate that, in addition to achieving a significant reduction in energy consumption, the displacement ventilation system can also achieve local environmental control within the preservation area of a large exhibition hall, while establishing an equilibrium of the soil-air environment. Moreover, by reducing the height of the return air inlet and the effective height of the environmental control area, energy savings of 47.7-65.9% can be achieved. Moving the position of the air supply outlet to the bottom of the pit has little effect on overall environmental control, while adjusting the air supply temperature to match that of the soil at the bottom of the relic preservation area can effectively reduce environmental disturbance, achieving uniformity and environmental stability. These research results provide not only an effective solution for local environmental control of the relics in site museums, but also a basis for the functioning of the displacement ventilation system within the site exhibition hall. (c) 2021 Elsevier B.V. All rights reserved.