NU-1500 High Efficiency HRV Pool Unit For Small Natatoriums
NU-1500 High Efficiency HRV Pool Unit for small pools The NU-1500 HRV Pool Unit is a high efficiency energy recovery pool dehumidification system which is field erected on-site. All of the components fir thru a 36" wide standard door. It has been designed with the latest state-of-the-art materials. Each component has been selectively designed to work to enhance the maximum energy performance as required for small indoor natatoriums.
Until now, it has been very expensive to bring into the pool room large amounts of outside air to detoxify the environment. Indoor natatoriums typically require the use of very expensive HVAC equipment to operate the pool environment within humidity levels that can reduce building damage and create a safe environment for the swimmers. Pool air temperatures are required to be elevated 1 to 2 degrees above the pool water temperature to achieve this objective. The evaporation rates off the pool surface vary up and down with the pool activity level. Outside air is a great oxidant and is a helpful deodorant for use in an indoor natatorium.
Standard designs of the past used a refrigerant compressor to cool down the return air from the pool and condense out the moisture within the space. The pool room temperatures require that the room be held at 82 degrees or more to maintain a lower evaporation rate across the pool surface. In order to get the temperature of the air up to 82 degrees a heating or reheat style post heating coil is required to be running all of the time. If the DX compressor system has hot gas reheat to achieve this function the compressor needs to run 100% of the time to produce this reheat. A refrigerant pool dehumidification system uses very expensive electricity to heat the air in lieu of less expensive natural gas or Cogeneration concepts to heat the air and water in the pool room environment.
For example, let's look at a 30x16 hotel pool requiring a 1,500 CFM refrigerant dehumidifier that would require 43,000 BTUH of capacity via the on board DX compressor and outdoor condenser hot air rejecter. The DX designed system would normally consume up to 3.8 kilowatts of electricity to dehumidify the pool room. The DX unit would remove up to 18 lbs. of moisture per hour as long as the pool room space temperature were maintained at 82 degrees at 60% relative humidity. However, the unit could only handle up to 700 CFM of outdoor air into the pool space. If larger amount of outside air were introduced into the unit the 18 lbs. per hour would be reduced. At $.10 per KWH energy costs for this DX system running 24 hours a day, 7 days a week all year long would cost the owner $3,328 per year to operate. In order to control energy costs this style of system only introduces 700 CFM of outside air, thus indoor air quality is poor and chloramine levels are high.
A typical pool room environment at 82 degrees, 60% relative humidity that has a moisture content of 98.43 grains of moisture per pound of air is a design standard. When using the NU-1500 the small pool described above would maintain the discharge air grain level at 98.44 grains per pound even when outside air reached 95 degrees dry bulb/75 degrees wet bulb. The NU-1500 would only require 1.2 kilowatts electrical energy to meet the design criteria and would be using 1,500 CFM of clean oxidized air. The operating cost of the NU-1500 would be $1,051 per year, at $.10 per KWH to operate. The temperature of the supply air in the winter based on a 10 degree day would be 76 degrees, therefore only a 10 degree rise of BTUH would be required to maintain the 82 degree air temperature of the space.
A small boiler loop can be utilized at 160-180 degrees at 16,200 BTUH. The cost to run the heat is only $.16 per hour when the cost of natural gas is $1 per 100,000 BTUH or $3.84 per day to operate. A typical winter month has a heating cost for the NU-1500 incoming outside air of $92.16 per month. The Nu-1500 runs 50% more efficiently and maintains a healthier environment than the DX refrigerant system at like airflows and capacities.
Why is the NU-1500 better?
- Highly competitive on first cost
- Significantly reduced operating and energy cost
- The outside Air is exchanged by utilizing a special counter flow polymer energy exchanger, with no moving parts.
- Polymer Micro-tube exchanger has 91% thermal efficiency and 34% latent efficiency and requires no maintenance.
- Each counter flow exchanger contains 960 square feet of surface area for supply air to come in contact with high temperature pool exhaust air.
- Totally sealed and fabricated with high-grade industrial polymer plastic with no chemical additives.
- Exchanger will not rust or degrade over time.
- Exchanger performance certified by ETL.
- Field erected on-site.
- All components fit through a standard 36" door.
- Highly efficient supply and exhaust blowers designed to operate at the lowest possible KWH rate.
- Blowers operate with a micro drive inverter controller.
- Micro drive receives input control signal from a duct mounted return air temperature and humidity sensor.
- Micro drives maintain proper airflow speeds to guarantee a negative pressure in the pool area at all times.