Swimming pools
![Indoor pool Air Relative Humidity, Water Vapor Pressure, sensible contributions by convection, swimming pool](../ima_ther/piscine.gif)
Evaporation in the swimming pools in normal activity in kg/h
m2
The rate of evaporation in kg/h m2 can be estimated for the swimming
pool in normal activity, integrating splashing due to the bathes
on the accesses of a limited zone (Smith, et al., 1993) (ASHRAE,
1995), according to the following formula:
- W = Rate of evaporation at the surface of the water level (kg/h
m2)
- Pw = Vapor pressure at saturation taken at the temperature of
surface of water, in kPa
- Pa = Vapor pressure at the dew point according to the temperature
of the ambient air of the room, in kPa
- V = Air velocity above at the surface of water, in m/s
- Y = Latent heat necessary according to the change of state of
the water vapor at the temperature of surface of water, in kJ/kg
Function = Pool_evap1(ts1, ts, Hr, Saw, Z)
- ts = Dry temperature in °C of the ambient air of the swimming
pool
- ts1 = Temperature in °C at the water level
- Hr = relative Humidity in %
- Vit = Air velocity in m/s at the level of water
- Z = Altitude in m
Evaporation in swimming polls in kg/h m2 according to the
type of activity in the covered swimming pools
For a latent heat (Y) of a value of 2330 kJ/kg and with a speed
of air (V) at 0,10 m/s and while multiplying by a factor of activity
(Fa) to reduce the rate of evaporation estimated according to the
corresponding level of activity, the equation is reduced to the
following expression:
![Water Tank Open Area, sensible contributions by convection](../images/for_eva1.gif)
- W = Rate of evaporation at the surface of the water level (kg/h
m2)
- Pw = Vapor pressure at saturation taken at the temperature of
surface of water, in kPa
- Pa = Vapor pressure at the dew point according to the temperature
of the ambient air of the room, in kPa
Type of swimming pools |
Factor of activity (Fa) |
Residential swimming pools |
0.5 |
Condominium |
0.65 |
Thermal baths |
0.65 |
Hotel |
0.8 |
Public swimming pools or Schools |
1 |
Whirlpools, spas |
1.5 |
Wave pools, water slides |
1.5 (minimum) |
Evaporation at the level of water in kg/h m2
- ts = Dry temperature in °C of the ambient air of the swimming
pool
- ts1 = Temperature in °C at the level of water
- Hr = Relative humidity in %
Function = Pool_evap2(ts1, ts, Hr)
Evaporation at the level of water in kg/h m2 (another formula)
Evaporation at the water level in kg/h m2
![reheating of the basin, Water Vapor Pressure, Wet bulb & Dry bulb temperature](../images/for_eva2.gif)
- W = Rate of evaporation at the surface of the water level (kg/h
m2)
- We = water content of the air at the temperature of the water
level (kg/kg of dry air)
- Wa = water content of the air of the room (kg/kg of dry air)
- V = Specific volume of the air in the room (m3/kg of dry air)
- Vµ = Specific volume of the air at the level of water
(m3/kg of dry air)
Function = Pool_evap(ts1, ts, Hr, Z)
- ts = Dry temperature in °C of the ambient air of the swimming
pool
- ts1 = Temperature in °C of the water level
- Hr = Relative humidity in %
- Z = Altitude in m
For this type of formula, it is necessary in theory to add projections
of water and the latent gains caused by the bathers
Sensible contributions by radiation
![swimming, pool, calculation, evaporation, water, thermal, temperature, humidity](../images/for_rayo.gif)
- T water = temperature of the water of the basin
- Ts = Ambient temperature of the swimming pool
Function = Pool_rayon(ts1, ts)
- ts = Dry temperature in °C of the ambient air of the swimming
pool
- ts1 = Temperature in °C of the water level
Sensible contributions by convection
![](../images/for_conv.gif)
T water = temperature of the water of the pool
Ts = Ambient temperature of the swimming pool.
![reheating, Water Tank Open Area, Wet bulb temperature, Dry bulb temperature](../ima_prog/piscine.gif)
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