Big savings come from small packages in Cardiff
A
Spirax Sarco product story
Edited by the Engineeringtalk editorial team
Dec 11, 2002
Energy savings are expected from the installation of three Spirax Sarco EasiHeat units, which are providing heating and hot water for buildings at the University Hospital of Wales, Cardiff.
Energy savings are expected from the installation of three Spirax Sarco EasiHeat units, which are providing heating and hot water for buildings at the University Hospital of Wales, Cardiff.
Rated up to 1200kW, EasiHeat is a compact steam heat exchange package for supplying heating and instantaneous domestic hot water in large or commercial premises such as hospitals, schools, colleges and hotels.
The EasiHeat units in Cardiff replace three shell-and-tube calorifiers, two of which were used to provide hot water for the building while the third fed the heating system.
These calorifiers had only the most basic controls, making them very inefficient.
"They were basically on or off", says Energy Maintenance Officer Stuart Cradock.
As pressure vessels, the calorifiers were also expensive to maintain due to a regular strip-down and inspection for flaws in the steam tubes.
Guarding against Legionella was another concern due to the requirement for high storage temperature of the domestic hot water before use.
In contrast, EasiHeat packages incorporate controls that modulate the flow of steam into the units' plate heat exchangers to precisely meet demand.
This achieves the highest energy efficiency.
In addition, the controls on the three units have been customised to interface with the hospital-wide computer-controlled Satchwell building management system (BMS).
The BMS allows an operator to control and monitor alarms on any of the automated plant systems around the building from a single computer.
"It's too early to give a percentage energy saving", says J McGarrigle Energy Support Officer.
"Last winter was the first time the system was put to the test, but the units have been performing very well".
The systems had to be shoehorned into a tight space in the plant room and Spirax Sarco customised them to fit between existing pipework.
The service available from Spirax Sarco made life much easier throughout the project: "Spirax Sarco has been very helpful in customising the packages for the BMS and to get them through awkward access into the plant room".
The hospital is already planning to build on the success of the three installed units with an additional four EasiHeat packages.
Two will serve the main theatre block, one will serve the day unit and one will run in the boilerhouse as a load leveller to back up the various heating and hot water systems in different buildings around the site.
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