COLUMN ENGINEER'S NOTEBOOK Use Single-Zone Variable Volume Strategy Using a single-zone, variable volume approach increases the ability to condition the space at reduced load. It also helps with dehumidification and saves fan energy. This is easier to accomplish with multiple and variable speed compressors. ASHRAE Guideline 36-2018, High-Performance Sequences of Operation for HVAC Systems, includes a sequence for single-zone VAV systems. Communicate With the Owner A school district's preference for packaged equipment may not allow the design to strictly meet the Maple Flooring Manufacturers Association's recommendation for temperature and humidity control. School gym HVAC systems do not typically include humidification. Also, the temperature and humidity may be high for short durations at peak cooling conditions. Thousands of existing gyms with wood floors operate successfully at lower humidity than recommended. There are also many gyms without cooling with very high summer humidity that do not have problems with the floor. It is important that the owner be informed and consent to a design outside of optimum conditions. If they object, the opportunity exists for a dialogue about first cost, risk and longterm operation. Conclusion Designing HVAC for gymnasiums in K - 12 applications is not as simple as one might think. Many factors create challenges. Understanding and addressing the challenges will result in a successful design that meets the diverse needs of the building occupants. References 1. ICC. 2018. "2018 International Building Code," Ch. 4, 423.4. International Code Council. 2. Maple Flooring Manufacturers Association Inc. 2005. "Humidity and Environmental Recommendations." https://tinyurl.com/ y9eexehs. https://bit.ly/2Z2fFn7 Rate this Column ASHRAE eLearning The Complete HVAC&R Learning Experience * No Travel Required * Learn When Convenient * Access When Needed * Track Performance CORPORATE PROGRAMS AVAILABLE For the complete course catalog visit ashrae.org/elearning or contact elearning@ashrae.org AU G UST 2020 ashrae.org ASHRAE JOURNAL 53https://www.bit.ly/2Z2fFn7 https://www.tinyurl.com/y9eexehs https://www.tinyurl.com/y9eexehs http://www.ashrae.org/elearning https://www.ashrae.org/