Microclimate Conditions in the SS. Salvatore Church of Bologna.

This paper analyses the microclimate conditions in the Church of Santissimo Salvatore in Bologna and their influ ence on the acoustics of the Church and the sound of the pipe organ. It is commonly acknowledged that the varia tion of air temperature, median radiant temperature, rela tive and absolute humidity could provoke thermal expan sions of metals which are used for the organ pipes. This paper analyses a monitoring campaign which lasted one year in which temperature and relative humidity were stored with a data logger. Moreover, the paper shows the effect in the variation of the microclimate conditions in the church by simulating different numbers of people in the church and different thermal conditions outdoor. Finally, the paper reports the variations of the acoustic parameters simulating the new values of temperature, relative humid ity and air velocity.