reducing the size of the pool - not really practical.reducing the air velocity above the water surface - limited effect.The energy loss and required heat supply can be reduced by

The heat supply required to maintain the temperature of the water in the swimming pool can be calculated as The evaporation heat (enthalpy) of water at temperature at 20 oC is 2454 kJ/kg. The evaporation from the surface can be calculated as The area of the swimming pool can be calculated as With air velocity above the water surface 0.5 m/s the evaporation coefficient can be calculated as

With air temperature 25 oC and 50% relative humidity the humidity ratio in the air is 0.0098 kg/kg - check Mollier diagram. The maximum saturation humidity ratio in the air above the water surface is 0.014659 kg/kg. There is a 50 m x 20 m swimming pool with water temperature 20 oC. Required heat to cover evaporation can be calculated asĮxample - Evaporated Water from a Swimming Pool To maintain the water temperature - heat must be supplied to the water. Most of the heat or energy required for the evaporation is taken from the water itself. Note! The units for Θ don't match since the this is an empirical equation - a result of experience and experiments. X = humidity ratio air (kg/kg) (kg H 2O in kg Dry Air) X s = maximum humidity ratio of saturated air at the same temperature as the water surface (kg/kg) (kg H 2O in kg Dry Air) V = velocity of air above the water surface (m/s) Θ = ( 25 + 19 v ) = evaporation coefficient (kg/m 2h) G h = amount of evaporated water per hour (kg/h) G s = amount of evaporated water per second (kg/s) The amount of evaporated water can be expressed as: 'We appreciate what one person or one organization can do to empower another person and help them achieve their dreams, and we look forward to continuing our support of Lane and its students.'Įvery gift makes a difference and brings our students closer to achieving their dreams.Evaporation of water from a water surface - like an open tank, a swimming pool or similar - depends on water temperature, air temperature, air humidity and air velocity above the water surface. 'When students thank us in letters, I feel grateful we can help, and I treasure the heartfelt sentiments I receive from them, because to me it feels like 'mission accomplished.' ' Niles and MaryAnn view Lane, themselves, and the scholarship recipients as the three legs of a stool, all dependent upon each other for success. They feel thankful to be able to offer support and in return develop a sense of gratitude. Niles and MaryAnn say 'It is very rewarding to partner with the LCC Foundation and we believe President Mary Spilde to be quite remarkable, she's always leading by example, and we feel lucky to have someone so strong and clear at the helm.' Remembering their own struggles as young adults increases the joy they feel in alleviating the financial strain students face. Symphonic music speaks to me, it feeds me something I need, so I want to share it with our scholarship awardees.' says Mary Ann. Eugene is an arts-rich community and students benefit from the exposure to such a fine example. 'Many years ago, I felt like we were just writing a check and that was ok, but when we embellished the scholarship with season tickets to the Eugene Symphony, it added a layer of awareness and inspiration to the student recipient's educational experience. Niles taught them that, 'You can always play a duet, trio, or in a band, for your entire lifetime.' Niles has two children who both play trumpet and cornet as did Nile's father and his grandfather. Niles and MaryAnn Hanson's dedication to the arts and their commitment to supporting the community shines through the scholarship gifts they make to students who are involved in music programs at Lane Community College.īoth grew up in homes where music was an integral part of their lives and they passed on their passion for a musical education to their children.

Hansons weather calculator