Design and Development of a Pressure Sensitive Hvac Unbalanced Pressurization Controller (hupq System for Minimizing Indoor Radon Concentrations in Slab-on-grade Structures
نویسندگان
چکیده
The highest time-averaged indoor radon concentrations for a slab-on-grade structure occur when the structure experience neutral pressure conditions. Experimental evidence was provided throughout the utilization of the University of Florida Radon Research House (UFRRH) showing that semi-diurnal atmospheric pressure variations are responsible for continuous pumping of radon-rich soil gas into the structure which elevates indoor radon concentrations. A pressure sensitive HVAC controller system was designed to minimize the indoor radon concentrations. The HVAC Unbalanced Pressurization Controller (HUPC) system accommodates for the semidiurnal pumping of radon and the transient changes in barometric pressure. The system is capable of initiating HVAC unit ventilation during the OFT thermostat position of the HVAC operating cycle. The system is designed to operate with two basic features: performing variable-in-time triggering functions and creating controlled HVAC positive ventilation. This HUCP concept may utilize to reduce indoor Rn concentrations from 2000 Bq m'3 to less than 120 Bq m"3 that have observed with continuous fan ventilation at the UFRRH . Two HUPC system designs were developed including one with a simple mechanical system alteration to the HVAC duct system. The 1993 International Radon Conference
منابع مشابه
Assessment of Temperature-driven Pressure Differences with Regard to Radon Entry and Indoor Radon Concentration
A heavily instrumented and unoccupied research house is used to continuously monitor the temperature in each room, the supply and return ducts, HVAC thermostat location, attic and outdoors. Simultaneous measurements of the differential pressures have been performed across the house walls, indoorfattic zones, the house slab and the indoor zones. Indoor radon concentrations and meteorological con...
متن کاملA Computer Program for Asd System Design Applications
Many practical applications for reducing elevated indoor radon concentrations depends on the utilization of active soil depressurization (ASD) systems such as the Sub-Slab Depressuirzation system. Applications of these systems for radon mitigation in large structures such as schools, hospitals and commercial offices are significantly more complicated than applications in residential structures ...
متن کاملDesign and operation optimization of an air conditioning system through simulation: an hour-by-hour simulation study
In the present research, performance validation of a Heating, Ventilation, and Air Conditioning (HVAC) system operating in a library building was conducted. The operating HVAC system was studied in terms of the provided indoor air conditions and energy consumption level. The fieldwork measurements showed that the HVAC system is not capable of providing the desired indoor air conditions based on...
متن کاملObservations of Pressure Differentials and Air Flow Rates Associated with Indoor Radon from Two Passive Radon Mitigation Vents in an Extended Gravel-bed Foundation-type Large Building
Discrete and continuous measurement of indoor radon concentrations, air flow rates, and pressure differentials for passive and active operational configurations of a passive radon control system were performed at the Biotechnology Research and Development Facility of the University of Florida, in Alachua County, Florida. The system was installed during construction and incorporated an extended ...
متن کاملIndoor radon survey in Shiraz-Iran using developed passive measurement method
Background: While in the open air the amount of radon gas is very small and does not pose a health risk, in confined spaces, radon can accumulate to relatively high levels and become a health hazard. Exposure to high levels of radon has been associated with an increased risk of lung cancer, depending on the time length of exposure. Radon level in dwelling of Shiraz with 1,200,000 popul...
متن کامل