Chillers Critical cooling for hospital units
chiller replacement project at a Londonderry hospital has been delivered with the help of Carrier Rental Systems. The company, which recently opened a branch in Lisburn near Belfast, was asked by contractor R J Smyth Engineering to provide a temporary cooling solution while existing chillers at Altnagelvin Area Hospital were replaced with new high efficiency Carrier chillers. The Omagh-based contractor, which specialises in industrial and commercial building services and process cooling, worked with CRS to co-ordinate delivery of the rental chiller to cover the six week replacement project. The new 500kW air-cooled Carrier hire chiller was unloaded onsite via a Hiab lorry and craned into position beside the building. It was equipped with temporary 4in pipework and connected to 4in PN16 flanged connections, with power supplied from the hospital’s mains via a 400 Amp breaker. CRS engineers connected up and commissioned the chiller, with onsite pumps circulating chilled water to and from the unit. Darren Smyth, who headed up the project for R J Smyth Engineering, says: “Space on site was fairly tight, as we had to posi- tion the temporary chiller alongside
the hospital, next to the recycling area. However, there was plenty of room for airflow on both sides, so performance was unaffected.” He added: “A key consideration in the project was that the hospital had to continue to function with- out interruption. The chillers pro- vide cooling to the hospital’s air handling units, wards, operating theatres and data centre. Therefore, the changeover between the old and new chillers had to be seamless.
“The temporary chiller enabled us to do this without loss of cool- ing, giving complete assurance to the hospital.”
Given the hospital setting, it was important that noise from operating plant was minimised. The Carrier 445 chiller supplied is equipped with built-in acoustic panels that attenuate sound produced by com- pressors and fans, and ensure building occupants are unaffected. A spokesman for the hospital’s estate services department said: “The project was far from straight- forward, and for obvious reasons it was very important to ensure continuity of cooling throughout the process.
The new CRS location at Rosevale Industrial Estate, Lisburn, is headed by Brian Woods, and the hospital project was the first in
a series of temporary cooling hire solutions now being delivered across the region, he says. These include a rental chiller for a leading pharmaceuticals compa- ny at Craigavon, following a com- pressor breakdown on an existing chiller. “The plant provided essen- tial cooling for the manufacturing process, so it was vital to have the replacement unit onsite, piped-up and working quickly,” he says. “We were able to deliver the unit and get it commissioned in double quick time, ensuring downtime was minimised and costs contained.”
Other projects in the pipeline include a large office development in Dublin, requiring a temporary cooling solution while a problem with the main chiller is repaired, plus a food production plant whose main chiller has developed a fault.
Altnagelvin Area Hospital and the temporary chillers above
Keeping guests cool at gala event
150 guests were assured of a first class dining experience at the Senior Open Golf Championship Gala Dinner in the banqueting marquee in the grounds of Hensol Castle in Wales in part thanks to an Andrews Chillers 50kW fluid chiller heat pump connected to four 15kW fan coil units to keep guests cool. The marquee at Hensol Castle which measures 21m x 12m was to accommodate around 150 invit- ed VIP guests and players. With so many people in a relatively con- fined space, plus hot food and unexpected higher than normal summer temperatures they could all contribute to creating a very uncomfortable hot and humid environment. To prevent this occurring at one of the most pres- tigious events in Wales this year, event organisers insisted that the
marquee was equipped with first- class temporary chiller hire solu- tion to control air-temperature; this proved a wise decision as temperatures on the day soared above 30oC.
In the build up to hosting the main event engineers from spe- cialist equipment Hire Company Andrews Chillers appraised the venue’s requirements and drew up a system configuration that could be installed quickly, would oper- ate quietly and automatically adjust to changes in air tempera- ture. One of the key requirements was that the overall system includ- ing pipework had to be unobtru- sive and not distract from the lux- ury of the internal dressing of the marquee.
Six days before the gala dinner Andrews Chillers delivered and installed an integrated
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cooling/heating system comprising a robust and reliable 50kW heat pump and four 15kW fan units. The heat pump was positioned outside the marquee with pipe runs to each individual air unit sited virtually in each corner of the marquee. During installation the whole system was filled with fluid to create a self-contained sealed pressurised installation.
The Andrews 50kW heat pump circulates chilled water to each of the four fan coil units which are able to deliver air flow into the marquee as rates of up to 1200m3/h. Warm air from the hos- pitality marquee is drawn into the lower portion of the air handling units, circulates over the ‘cold’ coils resulting in a drop in tem- perature, the cooler air is then gently blown back into room from the top vents. Since temperature
change will depend on air flow, air temperature and humidity the Andrews Chiller solutions had to adjust automatically to variants. As the warm air passes over the cold coils the water temperature rises, this returns to the chiller as part of the closed loop to be chilled and is then re-circulated to the air handling units.
This totally closed loop chiller system supplied for the gala dinner at the Senior Open Golf Championship is typically of the equipment configurations that Andrews Specialist Hire supplies where temporary standalone heat- ing/cooling is required. And with a network of more than 22 depots, one of the most comprehensive ranges of hire equipment and local engineers on hand to provide expert advice and guidance chiller solutions can be quickly in place.
HVR | October 2014 | 15
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