People in Glass-Enclosed Pools Should See Clearly
It’s not that Strunk’s hvac design or the installation of mechanical and service contractor R.J. Groner, Stroudsburg, PA, mechanical subcontractor Clima-temp Air Conditioning Co., Inc., and pool structure consultant/ contractor, Omega Pool Struc-tures, Toms River, NJ, lacked integrity or ingenuity.
And it wasn’t that Strunk’s dehumidification equipment choice wasn’t first rate, because he specified a custom-manufactured dehumidification system designed especially for the space by Dectron Internationale, Roswell, GA.
Instead, Strunk felt no hvac design and equipment could battle the combined elements of sub-zero weather conditions outside and the quickly evaporating 82Â°F water of a 28,000-gal pool as well as an 1,800-gal, 100Â° spa on the inside of a clear glass and metal enclosure.
“We told the Pocmont owners and the architect up front that we didn’t recommend an enclosure with this much glass because of the condensation and fogging possibilities during extremely cold days in the winter,” said Strunk, a partner at mechanical/electrical consulting engineering firm, Strunk-Albert Engineering, East Stroudsburg, PA. “We’ve designed hvac systems for several enclosed pools in the past, and this was by far the most challenging because of the amount of glass.”
“The most difficult aspect of this project was weather and the time frame,” said Franks, president of Climatemp Air. “Most of the work was done in the winter, in an open area that wasn’t enclosed for construction.”
Regardless of the potential condensation and fogging problems, the Pocmont’s owners and architect, Bernie Elias, The Elias Organization, Bensalem, PA, decided that the aesthetics of the beautiful enclosure far outweighed the risks. The pool enclosure, which is part of an $11 million expansion that includes a nightclub, outdoor pool renovation, gift shop, additional banquet room space, and offices, has quickly become the icon of the 52-year-old resort. Now tens of thousands of annual visitors view a panoramic scene of the Pocono Mountains regardless of the outdoor temperatures.
State-of-the-Art TechnologyThe pool and enclosure are a peek into what state-of-the-art indoor hotel/resort pools might include in the future. The pool decking is warmed with a radiant heating system. Fashionable fabric ductwork distributes ventilation. The enclosure gives the family-owned resort a five-star identity as it gleams in daytime sunlight and glows at night with architectural lighting.
The enclosure replaces a former 40-year-old, 20- by 50-ft pool and steel/plaster enclosure that suffered from humidity, chemical odor build-ups, and outdated technology.
“The old pool was like walking through the Brazilian rainforest, whereas the new indoor pool is very dry and comfortable,” said Greg Artzt, president of Pocmont Resort & Conference Center. “Plus, it’s so much nicer in aesthetics and in bottom-line operating costs, such as maintenance and energy use.”
Although aesthetics are important, the true success of the project rests in Strunk’s air distribution design and the dehumidification work of Dectron’s Dry-O-Tron® Model DS-060, which keeps the indoor pool environment at 50% rh via 53 lbs/hr of moisture-removing capacity.
“The equipment was installed toward the end of the project. It was placed in a loft about 12 ft off the floor in the mechanical room,” said Franks. “A lot of manpower and maneuvering was required to get the equipment — including the 2000-lb Dectron unit — into place.”
Exterior windows in indoor pool enclosures are a design concern because they get cold if the warm supply air does not properly blow against them. A cold window will condense moisture (much like a can of soda in summer) regardless of the humidity levels in the space.
Besides dehumidification, another strategy against condensation is Open Air’s thermally broken enclosure design where all mullions include a rubber gasket that separates exterior and interior aluminum. “Everybody was worried about condensation except for us,” recalls Jeff Bova, staff architect for Omega Pool Structures. “With good dehumidification and air distribution, our past installations that feature the thermally broken enclosure designs of Open Air have historically stayed clear even in the coldest of climates.”
“Climatemp installed all of the ductwork, handled the entire pool area, installed the equipment, and did a very good job on this project,” said Michael Katz, president, R.J. Groner.
Cloth Makes The DuctworkFor the expansion’s mechanical and service contractor, R.J. Groner, Stroudsburg, PA, the pool enclosure portion of the project was fairly easy with the exception of its first experiences with fabric ductwork.
The ductwork arrived in a few cardboard boxes via United Parcel Service. Preparation amounted to unpacking the boxes and screwing a track into the enclosure’s 25-ft-high top mullion. Installation took just a few hours. Duct supports were inserted into the track and connecting sections were zippered together, according to Katz. There were no cleats, hammers, snips, or heavy labor generally associated with traditional sheet metal ductwork.
According to Rick Franks, president of Climatemp Air, the installing subcontractor, the work wasn’t quite so easy. The fabric ductwork had to be installed at a great height.
“Our men were the hard working souls that braved the 20-ft ladders and scaffold to install the fabric duct,” he said. “They were also the ones in the trenches, crawling through the 36-in. underground ductwork to inspect it after it was backfilled.”
“Also, space restrictions in the mechanical room made installation of the ductwork, quite challenging,” said Franks.
“It was our first experience with fabric ductwork, and we liked the technology very much,” said Katz, who had more challenges with the other portions of the expansion that included lifting 26 Trane Company DX rooftop units into place and running conventional ductwork. “The specification of fabric ductwork probably saved the owner over 50% in air distribution labor and material costs.”
The challenge in the air distribution wasn’t so much the amount of glass, but the many structural aluminum mullions that protrude approximately 4 in. out from the glass surface and interrupt air flow and create eddy effects, according to Strunk. The solution is the fabric ductwork’s two diffuser channels that were positioned in such a way to bathe each plane of the glass roof with dry, conditioned air.
The Pocmont is probably one of the first fabric ductwork applications for an enclosed swimming pool in North America, according to Jon Flem, vice president for distribution at manufacturer’s representative firm, The Metz Co., Easton, PA, which represents fabric ductwork manufacturer, Fabric Air.
The 26 Trane DX rooftop units were lifted and lowered into place by helicopter. R.J. Groner and Climatemp Air worked with Carson Helicopter Service on this stage of the installation.
According to Franks, all 26 units were installed in about 4 hours. “That’s 6 to 7 units per hour.”
Design WorksBesides overhead air distribution, the space also has under-deck, PVC-coated steel ductwork that distributes air at the floor level to blanket the structure’s glass walls.
The hvac design also includes an in-deck radiant floor system manufactured by IPEX, Englewood, CO that’s supplied by a Weil-McLain, Michigan City, IN, 2-MMBtu liquid propane-fired boiler.
“The owner requested installation of the radiant floor system to provide added comfort for patrons using the pool,” said Franks. “The floor around the pool is maintained around 80Â°.”
South Jersey Concrete, Howell, NJ built the 20- by 50-ft gunite pool and it features filters and pumps by Pac-Fab, Sanford, NC.
“The design was good, and we had a good team working on the resort,” said Franks. “It is largely because of the teamwork that we were able to finish on time.”
Now with the real dehumidification test of a Pocono Mountain winter behind them, engineers, architects, contractors, and owners can all rest assured that a daring trek into an aesthetic design performs as well as it looks.
“Ideally from an engineering standpoint I’d prefer an enclosure with R-30 walls, two vapor barriers, and no glass at all,” said Strunk, “but that wouldn’t look as beautiful as this structure does.”
For more information on this project, contact Dectron, Inc., 995 Mansell Rd., Ste. B, Roswell, GA 30076; 770-649-0102; 770-649-0243 (fax); www.dectron.com (website).