Service & Maintenance / Extra Edition

Ammonia Chiller Provides Tailor-Made Refrigeration Solution for Ice Rink

Chiller Features a Very Low Ammonia Charge

August 18, 2014
Trans

Live Active Leisure (LAL) supplies sport and leisure management services and facility operations. The company has been in business for nearly 40 years and operates 15 leisure venues throughout Perth and Kinross in the United Kingdom and provides a range of sport and leisure services for the local community.

Dewars Centre in Perth offers a state-of-the-art curling ice rink and indoor bowling arena. Since it opened in 1990, the center has evolved over the years into a first class business and function venue as well as an internationally acclaimed sporting arena.

Ammonia Chiller Answers Legislative Challenge

Johnson Controls has been providing maintenance services for the existing refrigeration system for the ice rink at Dewars Centre in Perth. The ice rink’s refrigeration system had been operating on hydrochlorofluorocarbons (HCFCs). Due to European legislation, by Jan. 1, 2015 all HCFCs are banned for servicing and maintaining existing systems.

Mandate Requires Tailor-Made Solution

Live Active Leisure needed to replace its existing system due to the legally imposed phaseout of HCFCs. Overall, the solution needed to be environmentally friendly and LAL wanted an efficient system to replace the existing infrastructure. Johnson Controls proposed the installation of an air-cooled ammonia chiller complete with heat recovery and a very low ammonia charge due to the location being close to a pedestrians’ footpath.

Return on Investment Within Three Years

The implemented solution consists of several elements, all designed to answer the specific requirements of the customer.

• A low charge air-cooled ammonia chiller with variable speed drive screw compressors.

• Waste heat recovery from a desuperheater and oil coolers for ice pit snow melting.

• A supervisory control and data acquisition (SCADA) system for complete remote monitoring of the system.

• An efficient glycol pumping system using variable speed drives.

• New flow and return headers.

• The replacement of the flow and return individual loops for improved operation of the ice rink.

The skid-mounted chiller is a completely new solution, designed to match the client’s specifications. Since it works on ammonia, it necessitates more stringent controls due to the nature of the product. The chiller could therefore not be placed inside the existing plant room. Johnson Controls set up a new construction outside the building on the loading area. Because of the proximity to the nearby public areas and the intake of goods, the infrastructure had to be made safe and consideration was given to soundproofing the installation.

Extensive calculations were completed to ensure the noise was kept to a minimum, using variable speed drives for all the compressors and highly efficient EC fans for the air- cooled condenser. The fully enclosed off-site chiller was made weatherproof, and was equipped with acoustic removable panels and lockable access doors, allowing technicians to work safely inside the unit.

Achievements

Johnson Controls provided Live Active Leisure with a highly efficient system that delivers several advantages. For example, due to the compressors variable speed drives, the chiller is still efficient even at its minimum load of 10 percent. The EC fans and wet bulb controller on the condenser also facilitate closer capacity control, increasing the longevity of the unit and reducing the overall energy consumption.

To answer the environmental demands, Johnson Controls designed the air-cooled chiller to have zero ozone depletion potential (ODP) and global warning potential (GWP). The installation has a low ammonia charge at 0.3 kg per kW of the refrigeration capacity. The use of a new glycol system ensured the temperature of the cooling mat was brought down more rapidly, which resulted in quicker ice formation than the previous system. Consequently, the hours working on ice pad formation and running times of the chiller were greatly reduced. And when there is minimum load on the ice rink during off-peak hours, the chiller and pumps drop down in capacity to match site conditions.

And, last but not least, Johnson Controls acted as principal contractor, providing the client with a one-stop shop for all its demands, facilitating the execution and support of the project.

Publication date: 8/18/2014

Want more HVAC industry news and information? Join The NEWS on Facebook, Twitter, and LinkedIn today!

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

2014 Energy Efficiency Forum

Highlights from the 25th annual Energy Efficiency Forum in Washington, D.C.

Podcasts

NEWSMakers: Jeremy Begley

Jeremy Begley, home-performance specialist and Web and social media manager with National Heating and Air Conditioning Co. in Cincinnati discusses how and why you should add home-performance philosophies to your contracting repertoire. Posted on Sept. 12.

More Podcasts

ACHRNEWS

NEWS 09-15-14 cover

2014 September 15

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Venting R-22

The NEWS reported that a man received prison time for venting R-22. Should EPA step up enforcement?
View Results Poll Archive

HVACR INDUSTRY STORE

plumbing-hvac.gif
2014 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research

 

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

DON'T MISS A THING

Magazine image
 
Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.

STAY CONNECTED

facebook icontwitter iconyoutube iconLinkedIn i con