Sizing your Pool Heat Recovery Ventilator

Determining ventilation requirements for Indoor Pool enclosures

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.

Moisture removal capabilities

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 amount of moisture evaporated from a pool is effected by:

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

These short rules will help in understanding how these factors will effect moisture generation

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.

Detailed Calculation of Total

Ventilation Requirements

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.

1200DDPOOL, 700DDPOOL, 1000RHCAC, 1000RHC specifications

Lifebreath is a brand renowned for its commitment to energy-efficient indoor air quality solutions. Among their offerings, the Lifebreath 700DDPOOL, 1200DDPOOL, 1000RHCAC, and 1000RHC stand out as exemplary products designed for various residential and commercial settings. These units leverage cutting-edge technologies to provide superior ventilation, heat recovery, and air quality management.

The Lifebreath 700DDPOOL is specifically designed for indoor pools and similar environments. This model boasts dual-flow ventilation, which simultaneously circulates fresh air into the space while expelling stale air. The 700DDPOOL features a built-in dehumidistat, ensuring optimal humidity levels are maintained, which is vital for preventing mold and preserving air quality. Its energy recovery capabilities make it an eco-friendly choice, reclaiming heat from exhaust air to pre-condition incoming air, thus significantly reducing heating costs.

The Lifebreath 1200DDPOOL offers similar benefits but on a larger scale. With a higher airflow capacity, the 1200DDPOOL is ideal for larger pool areas or heavily used commercial spaces. It also incorporates advanced filtration technologies that trap allergens, dust, and pollutants, resulting in cleaner air. Both the 700DDPOOL and 1200DDPOOL are engineered for easy installation and maintenance, with features like removable filters and accessible components.

The Lifebreath 1000RHCAC and 1000RHC models shift focus towards whole-home ventilation and air conditioning solutions. The 1000RHCAC combines heat recovery with air conditioning capabilities, allowing for year-round climate control. The unit’s heat exchanger efficiently recovers heat from the outgoing air and transfers it to the incoming air, ensuring that energy is conserved even during cooling seasons.

In contrast, the Lifebreath 1000RHC emphasizes effective heat recovery without an integrated air conditioning system, making it an excellent choice for areas where cooling is not a priority. Both models boast a quiet operation, ensuring no disruption to daily living, along with energy-efficient certifications that appeal to eco-conscious consumers.

Overall, Lifebreath’s 700DDPOOL, 1200DDPOOL, 1000RHCAC, and 1000RHC models provide exceptional performance, versatility, and user-friendly features. These air management systems represent the future of sustainable indoor air quality solutions, meeting diverse ventilation needs while prioritizing energy efficiency and comfort. With Lifebreath, users can breathe easier knowing they have invested in cutting-edge technology designed for health and efficiency.