How Can You Calculate Daily Water Loss in a Heated Indoor Spa?

[Dan Shenk]

I am interested in finding how to calculate daily water loss for a heated water spa located in a temperature-controlled pool room. The water volume and surface area are constant. I want to determine the amount of daily water loss as spa water temperature, ambient air temperature, and relative humidity of the pool room fluctuate.

The calculation only needs to be accurate enough to determine if evaporation can account for daily water loss , or if the spa may be leaking.

Thanks for any help or references you can give me on this point.

Dan

 

[member 553083]

The most accurate way to calculate the daily water loss for a heated water spa located in a temperature-controlled pool room would be to measure the water level before and after a 24-hour period and subtract the difference. This will give you the exact amount of water lost in the given time frame and will take into account any fluctuations in spa water temperature, ambient air temperature, and relative humidity. If you do not have access to such measurements, you can also estimate the daily water loss due to evaporation. This can be done by using the formula: Evaporation Rate = (0.46 x Air Temperature (°C)) + (0.0012 x Relative Humidity) + (0.0006 x Spa Water Temperature (°C)) This formula will give you the rate of evaporation over a 24-hour period in liters per hour. You can then multiply this figure by 24 to get the total amount of water lost due to evaporation in a given period of time. If the calculated evaporation rate is lower than the actual water loss, then there may be another source of water loss, such as a leak, that should be investigated.