Lifebreath 1000RHC Benutzerhandbuch

There are two primary reasons to ventilate an indoor
pool enclosure. One is to provide effective and 
efficient control of harmful humidity levels. The other
reason is to control the Indoor Air Quality (IAQ) in
the pool room enclosure. When an HRV system is
adequately sized to control humidity, 
the IAQ will automatically be controlled for most 
situations. Therefore this HRV sizing guide will focus
on the amount of moisture introduced into 
the air from the pool and the moisture removing
capabilities of an HRV at various flow rates.

1. Surface area of the pool
2. The water temperature
3. Indoor air temperature 
4. Indoor relative humidity (R.H.)
5. The amount of activity in the pool room

1. Larger areas of water will evaporate greater 

amounts of water.  
(By using a pool cover the surface area of the
pool will be reduced and will substantially reduce
water evaporation.)

2. Higher water temperatures will increase water

evaporation.

3. Lower indoor air temperatures will increase water

evaporation.

4. Lower indoor relative humidity will increase water

evaporation.

5. Activities in the pool will increase the water 

surface area, therefore water evaporation will
increase.

In addition to the amount of air being exchanged,
moisture removal depends largely on the moisture
content of both the inside and outside air. The
trends below outline these principles.

•

The higher the indoor relative humidity, the 

larger the moisture removing capabilities.

•

The higher the indoor temperature, the larger 

the moisture removing capabilities

•

The lower the outdoor temperature, the 

larger the moisture removing capabilities.

The following charts and equations can be used 
to accurately size the HRV for a indoor pool 
application. At this time some decisions should be
made with regards to:

•

Pool water temperature

•

Indoor air temperature

•

Relative humidity

It should be noted that the construction and quality of
materials used in the construction of the pool room will
influence the size of HRV required. High quality 
windows such as triple glazed, argon filled will allow a
higher indoor humidity level before condensation will
occur. A pool room built with loose construction 
techniques will have a higher natural ventilation rate
than that of a room built to higher standards. It is 
recommended for all applications it is assumed there is
no natural ventilation. 

The first table contains the evaporation rate of
water based on the water temperature, room 
temperature, and room relative humidity.

The second table contains the flowrate factor
based on the indoor temperature, outdoor 
temperature, and room relative humidity.

The total ventilation rate per square foot of water
surface area is the result of these calculations. The
total ventilation rate is this product multiplied by the
water surface area.