The use of FEMLAB models to protect a monumental church organ in case of hot air church heating

Schellen, H.L., van Aarle, M.A.P., van Schijndel, A.W.M.J.
Technische Universiteit Eindhoven

The Walloon Church in Delft is an important monumental church in the Netherlands. The monumental interior parts consist of a monumental pulpit, monumental pews, monumental escutcheons and an important burial monument. The monumental Bätz/Witte organ in the church dates back to 1869 and was last restored in 2000. The heating system in the building was originally a direct hot air system, Mark Fohn type 115RH of Mark Heating Systems. The heat capacity of the heating system was 115/77 kW (high/low). The hot air was brought into the church by a re-circulation system with an airflow rate of 7400/5000 m3/h (high/low). The warm air inlet consisted of a single grille at about 3 m above floor level. The outlet was a single grille in the floor. The air was re-circulated for 100 %. The thermostatic device in the church was located near the pulpit at a height of about 3 meters.