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Client Carney Hospital

Location Boston, Massachusetts, USA

Sectors Facilities management

The challenge

Critical Cooling with Limited Space

Carney Hospital near Boston, Massachusetts was one of the nation’s first care center that dedicated a whole wing for Coronavirus treatment, including negative pressure wards.

With an entire wing being pressurized and the whole hospital working at full capacity, their cooling system was absolutely critical.

To ensure patient safety the hospital needed to replace two permanent cooling towers on the roof. The issue was that the funding for the towers couldn’t be secured in time, so temporary towers had to be put in place.

The temporary tower had to be installed at grade while the customer’s existing piping was at roof level. This results in overhead water, which on loss of pump pressure would drain down and flood the cooling tower basin of an open loop temporary tower.

Project fact file

2 for 1

Only one cooling loop

30 %

Less cooling capacity required

50 %

Reduction in carbon footprint

19,000 Gallons

In the new water tank

1,000 Nominal tons

Cooling tower capacity

The solution

Exchanging Two for One

When dealing with high-rises that have their cooling towers on the roof, the conventional way to provide temporary cooling is by having two loops. That means installing a Plate and Frame heat exchanger therein isolating the high-rise building loop from the grade mounted temporary equipment. Separate pumps are required for both sides of exchanger.

Having two separate cooling loops also means increasing 2 to 3 degrees Fahrenheit of temperature and a second water treatment system. This requires more power and a higher capacity for the cooling tower to work.

Considering this scenario and the very limited physical space available, our team came up with a significantly more efficient solution.

We used a single GT40 cooling tower and gravity drained the tower basin into a 19K gallon open top surge tank, which was provided with a single condenser water pump. This allowed for drain down capacity and was more energy efficient and reliable than the heat exchanger(s), while saving costs for the additional piping and second operating pump.

the aggreko difference

Modular temporary cooling tower systems saves hospital costs

The impact

Cutting Costs and Standing Out

The hospital saved considerable expense by using less equipment and, consequently, less electricity. Also, with a better temperature efficiency, we were able to reduce the required cooling tower capacity by 30%.

There was also expressively less hose and fittings required, which simplified safer installation due to fewer trip hazards.

We overcame the challenge of space available not only by implementing a leaner unconventional solution, but also because the elevated legs of our GT40 Cooling Tower allowed us to fit the auxiliary basin underneath the equipment.

Additionally, with the variable speed drive of the GT40 fans, there is much less noise being made, which is extremely important for patients.

Last but not least, a key component of the differentiation was the 50% reduction in footprint that the cooling towers gave the hospital.

“Solving challenges for our customers is part of our DNA. We were able to provide substantial savings while reducing capacity and the footprint, overcoming the challenges."

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