[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-662354-105":3,"detail-sidebar-cat-0-en-105":80,"doc-detail-662354-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","swimming-pool-load-calculations-condensation-problems-with-humidity-control","Swimming Pool Load Calculations - Condensation Problems with Humidity Control","","Swimming pool load calculations for poolroom enclosures focus on the origin and consequences of indoor moisture. The document identifies moisture sources including evaporation from pool water, outdoor ventilation air, and people, then explains how temperature-driven changes in air moisture capacity lead to condensation. It details dew point concepts, provides a method to estimate surface temperature, discusses U-value impacts for windows, and recommends surface temperatures to prevent visible condensation. It also outlines recommended relative humidity ranges and humidity-control methods such as make-up air/exhaust.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/swimming-pool-load-calculations-condensation-problems-with-humidity-control/662354/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/swimming-pool-load-calculations-condensation-problems-with-humidity-control/662354.png","ImageObject",300,407,{"name":42,"@type":43},"Anna Hans","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":52,"interactionType":53,"userInteractionCount":30},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What are the primary sources of moisture load in indoor pools?","Question",{"text":62,"@type":63},"Indoor pools have three main sources of moisture: evaporation from pool water surfaces, outdoor ventilation air, and people. Each contributes moisture through vapor generation and introduction into the enclosure.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How does condensation damage an indoor pool environment?",{"text":67,"@type":63},"When condensation forms on surfaces, it can damage the materials it contacts. It also provides conditions that support growth of fungi and bacteria.",{"name":69,"@type":60,"acceptedAnswer":70},"What relative humidity range is recommended for indoor pool environments?",{"text":71,"@type":63},"The ASHRAE guidance provided recommends maintaining between 50% and 60% relative humidity. Values above 60% are uncomfortable and increase biological growth and condensation risk, while values below 50% increase evaporative cooling and water and chemical usage.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},662354,1793212750,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,105,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Exam",70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},6,"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":107,"slug":108},7,40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":96,"slug":129},19,"General","general",{"code":4,"msg":81,"data":131},{"doc_id":78,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":106,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":30,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":33,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":79,"read_time":123},5909892332657,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","Application  \nNote 10  \nSwimming Pool Load Calculations  \nI NTRODUCTION C ONDENSATION  \nThis application note highlights the source of moisture loads in poolroom enclosures and its potential harmful effects if left uncontrolled.  \nS OURCES OF MOISTURE LOAD  \nIndoor pools have three main sources of moisture:  \n1. Evaporation from pool water surfaces  \n2. Outdoor ventilation air  \n3. People  \nThe vapor pressure difference between pool water and the air causes continuous evaporation. The vapor pressure of both water and air will change based upon each one’s temperature and the differences in their temperatures. The evaporation rate increases the higher the water temperature is in relationship to the air temperature. The activity level at the water surface will also either increase or decrease the evaporation rate. Activity factors as defined by the ASHRAE Applications Handbook are shown in Table 2 of this bulletin.  \nDuring the summer months, outdoor ventilation air that is being introduced into the space to meet local code requirements may also be contributing to the moisture load of the space depending on the climate location.  \nThe presence of spectators also adds to the moisture load of the space. This load is typically minimal in residential pools but can be fairly substantial when bleacher spectator areas are present.  \nP ROBLEMS WITH HUMIDITY  \nAir is a gas. Like most gases, it expands in volume when heated and contracts in volume when cooled. This expansion or contraction that occurs with changing temperatures increases or decreases the percentage of moisture that the air can hold. In other words, as air expands, its ability to hold moisture increases. For a given moisture content, the percentage of moisture to air volume (relative humidity) is reduced when air is heated.  \nCondensation is one of the major enemies to an indoor pool environment. When condensation develops on surfaces, it can damage the material it forms on and also provides food for fungi and bacteria to grow.  \nVisible condensation will appear when the surface temperature is below the indoor dew point of the space. (See Figure 1.) In most pool environments, this dew point is in the range of 58° F to 66° F. The surface temperature can be calculated using the formula:  \nTs = Ti –(K x (1/R) x (Ti – To))  \nTs = Surface Temperature Ti = Indoor Temperature  \nK = Constant of 0.68 for Vertical Surface R = R Value of Structural Panel  \nTo = Outdoor Temperature  \nSince windows are the major contributor to condensation in this environment, we will only look at this building component. However, the same process can be used for any building component. Windows typically do not have an R value but are rated with U values. The U value is the reciprocal of the R value, R = 1/U.  \nThe U values published for windows are for the entire window assembly and do not reflect the U value for each component of the window. For this reason we recommend that you add 5° F to the actual calculated surface temperature and use this value for your dew point. This would mean that all surfaces in an indoor pool environment should be kept above 63° F to 71° F to prevent visible condensation.  \nIf you’re more comfortable referencing percent relative humidity, Graph’s 1, 2 and 3 show what percent relative humidity that surface condensation will appear for different U values at indoor space temperatures of 76° F, 82° F and 86° F with outdoor temperatures of 25° F, 0° F, and -25° F.  \n% RH Condensation Will Form  \n75  \n70  \n65  \n60  \n55  \n50  \n45  \n40  \n35  \n30  \n25 Degree Outside Temperature  \n0.7 U Value  \n0.6 U Value  \n0.5 U 0.4 U  \nValue Value  \nWindow U Values  \n0.3 U Value  \n% RH Condensation Will Form  \n65  \n60  \n55  \n50  \n45  \n40  \n35  \n30  \n25  \n20  \n0 Degree Outside Temperature  \n0.7 U Value  \n0.6 U Value  \n0.5 U 0.4 U  \nValue Value  \nWindow U Values  \n0.3 U Value  \n% RH Condensation Will Form  \n55  \n50  \n45  \n40  \n35  \n30  \n25  \n20  \n15  \n10  \n-25 Degree Outside Temperature  \n\n|  |  | ","cbCaicrnm1cqGbTR","https://ap.wps.com/l/cbCaicrnm1cqGbTR","pdf",438679,"English","# Introduction - Condensation\n# Sources of Moisture Load\n# Problems with Humidity\n## Condensation and Dew Point\n## Window U Values and Surface Temperature\n# Humidity Range\n# Methods of Humidity Control","[{\"question\":\"What are the primary sources of moisture load in indoor pools?\",\"answer\":\"Indoor pools have three main sources of moisture: evaporation from pool water surfaces, outdoor ventilation air, and people. Each contributes moisture through vapor generation and introduction into the enclosure.\"},{\"question\":\"How does condensation damage an indoor pool environment?\",\"answer\":\"When condensation forms on surfaces, it can damage the materials it contacts. It also provides conditions that support growth of fungi and bacteria.\"},{\"question\":\"What relative humidity range is recommended for indoor pool environments?\",\"answer\":\"The ASHRAE guidance provided recommends maintaining between 50% and 60% relative humidity. Values above 60% are uncomfortable and increase biological growth and condensation risk, while values below 50% increase evaporative cooling and water and chemical usage.\"}]","Swimming Pool Load Calculations - Condensation Problems with Humidity Control | PDF"]