a certain amount of outdoor air is exchanged naturally with indoor air. Every home has a certain amount of ACHn, e.i. Therefore in our calculations, we will use the natural ACH or ACHn. To calculate the ACH, the volume of air exchanged per hour is divided by the volume of the house:įor example, if 75 cubic meters of air enters and leaves a building every hour (75 m 3/h) and the building has an interior volume of 250 cubic meters (80 square meter building with 3-meter ceilings), the Air Exchange rate is:Īpart from northern Europe, the dominating European ventilation system is natural ventilation. The ACH is a dimensionless term used to quantify the amount of air exchanged naturally or with the help of a mechanical ventilator. In specific, we will see how to calculate the volume of air needed from an HRV system to reduce Radon concentration to a certain level and eventually choose a correct HRV size.īefore start, we need to know what the Air Changes per Hour or ACH is. In this number of RadonMarket Mag we will examine the effect of HRVs on the indoor Radon concentration. Typical efficiencies range of HRVs are from 55% to 75%, but some highly efficient models are rated as high as 93% efficiency. This technique reduces the energy required to bring outside air up to ambient room temperature therefore, it saves money on heating bills. HRV is a system that uses the heat in the stale exhaust air to preheat incoming fresh air. Mechanical ventilation systems such as Heat Recovery Ventilators (HRV) can increase the house’s current natural ventilation rate besides saving energy. In many cases, the indoor air quality could be improved by improving the current air exchange rate. The interest in indoor air quality has been increased in recent years. Reza Hosseini, PhD – Managing Director at RadonMarket, R&D Manager & NRPP MFM Certified Radon Professional at Niton srl
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