at concentrations that do not exceed Public Health Standards, ozone has little potential to remove indoor air contaminants. • If used at concentrations that do not exceed public health standards, ozone applied to indoor air does not effectively remove viruses, bacteria, mold or other biological pollutants. Hydro-air applications Hydro-air installations use an air handler to provide air flow to an indoor coil for cooling and a hydronic coil for heating. A boiler supplies hot water to a coil encased in an air handler; the air handler provides the supply air to distribute through the home. Some of the key features are venting, zoning, boiler versatility and air flow. With a hydro-air system, venting is only necessary at the boiler. Combustion doesn’t take place at the air handler, thus eliminating the need for a heat exchanger, venting, fuel supply, and combustion air for each air handler or zone. Zoning is accomplished by installing on each system a thermostat, duct system and an outdoor unit. Zone valves at the boiler control the input to the hydronic coil. The boiler can have many functions besides providing hot water to the hydronic coil. The boiler can heat domestic hot water, provide hot water for a baseboard loop or for a radiant system in the garage or a loop for snow melt. 26 National Oilheat Research Alliance Air flow can be designed for a particular zone. Hydro-air systems normally run with a lower CFM than a hot air system, allowing lower temperature rises and longer run times. Installing one complete duct system in an existing home can be quite intrusive while hydro systems can consist of a number of small duct systems throughout the home. Please remember all duct design rules for supply ducts and returns apply to hydro systems as well. IMPORTANT FORMULAS Fan rpm = diameter of motor pulley x motor rpm diameter of fan pulley New cfm = (new rpm x existing cfm) divided by existing rpm New rpm = (new cfm x existing rpm) divided by existing cfm New s.p. = existing s.p. x (new rpm divided by existing rpm)2 New hp = existing hp x (new rpm divided by existing rpm)3 BTU/Hr(required) CFM = 1.08 X TD Heating Factor (HF) = building heat CFM sensible heat loss Cooling Factor (CF) = building cooling CFM sensible heat gain Cooling Factor (CF) = building cooling CFM sensible heat gain CFM = OUTPUT BTU 1.08 X TD CFM = AREA X VELOCITY
NORA Advanced Air Flow
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