The thermal performance of the underground airpipe air conditioning system constructed at the Non-Conventional Energy Research Institute, Ghosi has been studied. The heat exchanger is used in recirculation mode to aircondition eight rooms in a guest house at the Institute. The temperature and relative humidity of a conditioned and non-conditioned room are measured every two hours. The cooling potential of the system is estimated. It is observed that reasonably good thermal comfort conditions can be created in the building with such a system.

This latest addition to the University of East Anglia Campus cost 20 per cent less to build than a conventional building of similar proportions and uses 80 per cent less energy.

The fan pressurization method produces a result that characterizes the airtightness of the building envelope or parts thereof.