An energy efficient approach for radon management. Part III: Radon management.

This paper describes the management of radon concentrations at the Hong Kong University of Science and Technology (HKUST). Applying our derived specific modification factor in the radon concentration predictive mathematical models, we were able to accurately estimate radon concentrations under different conditions of Heating, Ventilating and Air conditioning (HV AC) operations. Various combinations of HV AC operating schemes were tested mathematically. Many possible combinations demonstrate optimal effects. Examples include maintaining a minimal air exchange rate without operating the full HV AC systems to address the other comfort factors during the off work hours, the early actuation of the HV AC system at the beginning of the work day together with the early shut down of the system towards the end of the regular work day, etc. In addition to this, small climate chamber studies were conducted to evaluate the radon emission reduction effect of using p-u based paint covering on various building materials used at HKUST. The results confirmed the Polyurethane-based paint is a good wall treatment material, which can effectively reduce radon emission from the room walls by approximately 50%. This mitigation approach of treatment can also minimize the daily HV AC operational hours while achieving low radon levels at minimal energy consumption.