This webinar focuses on the challenges and best practices in designing HVAC systems for indoor pool spaces (natatoriums). These unique environments require careful consideration due to the presence of water, humidity, and chemicals like chloramines, which can significantly impact air quality and building integrity.
They start by explaining the key differences between indoor pool spaces and typical office environments. Indoor pools usually operate at higher temperatures, between 82 and 86 degrees Fahrenheit, and maintain higher humidity levels, around 60%, compared to office spaces, which are generally 72 to 75 degrees with much lower humidity. The evaporation of pool water and the presence of chloramines, a byproduct of chlorine used to disinfect the water, add complexity to the design. Chloramines not only cause discomfort, such as eye irritation but can also lead to the corrosion of building materials if not properly managed.
Three main challenges in natatorium design are discussed: dehumidification, ventilation, and maintaining appropriate air pressure. Dehumidification is critical to prevent condensation, which can lead to corrosion. There are two primary methods for dehumidification: mechanical dehumidifiers, which use refrigeration cycles to condense moisture, and outdoor air dehumidification, which leverages dry outdoor air to control humidity levels. In regions like Denver, with a dry climate, outdoor air dehumidification can be particularly effective, reducing the need for mechanical systems.
Ventilation is another critical aspect, ensuring that enough fresh air is brought into the space to remove harmful chloramines and maintain air quality. ASHRAE 62.1 provides guidelines on the minimum amount of outdoor air required, but for high-occupancy pools, more outdoor air may be necessary. Innovent’s approach often involves increasing the amount of outdoor air by up to 50% compared to the ASHRAE minimums, which improves air quality and reduces the need for mechanical dehumidification.
Maintaining slight negative pressure in the pool area is also important to prevent humid, chloramine-laden air from spreading to other parts of the building, where it could cause damage or discomfort. Control systems that monitor humidity, temperature, and pressure are essential for keeping the environment safe and comfortable for both swimmers and spectators.
A case study at the University of Minnesota illustrates the effectiveness of these design strategies. The university had issues with poor air quality in their pool area, which led to the NCAA banning competitions in the space. By installing Innovent’s system, which included increased outdoor air ventilation and proper dehumidification, the chloramine levels in the pool area were reduced by 70%, allowing the facility to resume hosting competitions.
In conclusion, the webinar emphasizes the importance of designing HVAC systems that prioritize air quality, dehumidification, and energy efficiency in indoor pool spaces. By using advanced technologies like energy recovery systems and ensuring proper ventilation, facilities can maintain healthy environments while minimizing operational costs.