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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve used the following method in modeling indoor
swimming pools/natatoriums in eQuest:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>For a Hotel Pool, ASHRAE guidelines call for pool water
temperature to be between 82-86F and the air temperature to be 82-85F (but also
2-deg F greater than the pool water temp) and a RH range of 50-60%. I’ve
used a water temp of 82F and an air temp of 84F. I’ve also seen pool
drawings with a water temp of 80F in which I used an air temp of 82F. This design
seems to be more prevalent actually, so I’ll use the 80F pool & 82F
(50%RH) air.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The RATE OF EVAPORATION can be calculated by the following
equation:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Wp = 0.1 x AREA OF POOL (sq ft) x (Pw – Pa) x Activity
Factor (2007 ASHRAE Handbook – HVAC Applications 4.6 Eq 2)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Wp is the evaporation of water lb/h<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Pw is the saturation vapor pressure taken at surface water
temp (in Hg)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Pa is the saturation pressure at room dew point (in Hg)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Activity Factor for a Hotel Pool is 0.8 (Residential pool is
0.5)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>When you find your evaporation rate you can then multiply it
by the Enthalpy of saturated water vapor, or hg, which is in units of BTU/lb to
find your heat gain (BTU/hr).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In eQuest this heat gain can be added under the Building
Shell for the Pool space. In your Pool Space, under the Equipment tab, add an
Internal Energy Source. This is a Process source type and your Input Power is
the calculated heat gain (BTU/hr). I’ve been using a Latent HG ratio of
1.0. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Input this energy source and set the Heating/Cooling
Thermostat control on the space to 82/76 & Maximum Humidity control to 50
or 60%.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Verify your compressor load in the Detailed Simulation
Output file.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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