Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Dynamic modelling and comparison between transient step response of capacitive hygrometers and chilled mirrors for delay compensation

Ettore Zanetti, Rossano Scoccia, Marcello Aprile, Mario Motta
Politecnico di Milano, Italy

Abstract: This manuscript presents the results of an experimental study carried out to evaluate the delay of the transient responses of five capacitive hygrometers with respect to four chilled mirrors. Several experiments were carried out changing the values of air flow rate, temperature, and relative humidity in the test chambers in the RELAB research group facility. The results were used to derive different models of the sensors, that can be used to check and eventually reconstruct data from transient operation of desiccant evaporative cooling heat exchangers. The results show that the chilled mirrors are faster for coupled temperature and relative humidity step changes, while for just a relative humidity change the two instruments perform in a similar fashion. This is due to the inherit dependence of relative humidity from dry bulb temperature.
Keywords: dynamic response, capacitive hygrometer, chilled mirror, dessicant system
Pages: 1773 - 1780