Portable cooling is most often thought of in terms of an emergency. For example, a building’s chiller breaks down, and portable cooling is required immediately to keep tenants happy and/or critical applications up and running.
But portable cooling can be used in a number of other different applications. The temporary equipment is useful for long-term special applications that don’t require permanent cooling. It may also be necessary when a facility schedules certain maintenance procedures that require shutting down cooling systems.
Whatever the need may be, portable equipment companies are widely available to make sure the correct equipment is delivered for a particular job.
When the sports channel ESPN decided to set up an ESPN Zone on the bottom floor of a Manhattan high-rise building, portable cooling was required to keep the heavily lighted set comfortable. The makeshift studio will be in place for many months, but since it won’t be a permanent addition to the building, portable cooling made sense.
To that end, Spot Coolers, New York, brought in two of its 12-ton units to handle the job. The 1,000-lb machines were rolled in on 8-in. casters and set up behind a wall that framed the 60- by 40-ft studio.
“The 12-ton unit is great, because it allows you to duct supply and return air long distances. We have large fan motors on the unit, so you can put over 100 ft of duct on each supply and return port. This means you can put the unit relatively far away from the room or the application and still provide cool air and pull heat out of the space,” says Garth Tagge, vice president, Spot Coolers.
In this particular application, the units were not that far away from the studio, so the supply air was ducted into the room and the return air was pulled out of the room by cutting holes in the dividing wall. Being a television studio set, it was necessary to keep equipment noise to a minimum. The wall helped mask some of the sound, but more needed to be done.
A 12-ton unit provides 4,800 cfm of air coming out of two 14-in. supply hose. Each supply hose delivers 2,400 cfm of cool air. “They had to slow the air down to get rid of the air noise,” says Tagge. “To do that, they took the supply hoses and split them off so they had two 14 in. hoses coming off each 14. in. supply. Then they put in a tee, diverting the air into two hoses. That slowed the air down, which reduced any noise from the airflow.”
This particular job was a challenge, because the building was older, and there was not much room to stage the equipment. Another challenge was how to handle the heat rejection. An abandoned elevator shaft provided the solution. The shaft wasn’t operational and exhausted at the roof. It was a good size, so the heat didn’t back up into the working space, and it was possible to reject the heat without incident.
Usually in a temporary situation using a 12-ton unit in an office building, the only place to duct the hot air is into a stairwell or a mechanical room. Getting rid of the heat can be a problem, and the bigger the unit the more heat is being transferred, therefore, the bigger the problem can become. In this case, it was convenient to use the shaft, which was only 50 ft away from the equipment. The condensate created by the equipment was simply pumped to a sink.
With the tight economy these last few years, many office buildings and commercial spaces have been deferring maintenance in order to save money. A 30-plus story office building in Atlanta finally reached a point where maintenance could no longer be put off. The property manager decided it was time to schedule a major shutdown of the chiller plant and drain the cooling tower.
This particular building had numerous places throughout its spaces in which chilled water was required to feed computer room and equipment room air conditioners. The four-day planned shutdown meant that portable cooling had to be brought in to keep these sensitive areas at the correct temperature.
The property manager talked with the tenants several months prior to the shutdown and asked for a list of areas that needed to be cooled. Once identified, Spot Coolers was contacted to assess each situation and determine the proper type and capacity unit to be used. They came in the day before the shut down, staged the equipment, which took a full day, and made sure that heat rejection could be accomplished.
This particular job required 70 portable cooling units, each with a capacity of 1 to 1.5 tons. In order to set up the equipment, Spot Coolers brought in ceiling kits, which are 2- by 2-ft metal panels with hoses coming off them. The 12-in. hose drops down onto a flange on the portable equipment, and the hot air is channeled up through that hose up into the ceiling.
Basically what happens is the ceiling tile is pushed aside and is replaced by the ceiling kit panel. Once the panel is dropped in, the hose comes off the panel drops onto the equipment. Condensate goes into buckets, which the property manager’s staff had to empty several times during the shutdown.
This particular job was a bit more unusual than many portable cooling jobs in that the property management company was involved. Tagge says that more often than not, Spot Coolers deals directly with the contractor. “Most contractors are very knowledgeable about portable air conditioning. We are often brought in to help size the job and determine which equipment is going to be used. We have all kinds of portable air conditioning, including air cooled, water cooled, split systems, and heat pumps.”
Many times the contractor will take care of staging the equipment himself, especially if it might get in the way of his crew if staged prior to the day work is done. Otherwise, Spot Coolers takes care of it. “We make sure our equipment is as unobtrusive as it can be. We also make sure the fleet of air conditioners is in good shape, clean, and operational. We always replace equipment that’s been battered or beat up,” notes Tagge.
The result is great looking equipment that also performs well, which is important even in a temporary situation.
Spot Coolers is the nations oldest and largest portable air conditioning company with 26 locations from coast to coast. Spot Coolers provides turnkey service, including delivery, pick up, and set up as well as 24 hour emergency service. Contact Garth Tagge at 800-367-8675 for further information or visit their website at www.spot-coolers.com.