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23/11/2011
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St George's Hospital in Tooting says it is saving £45,000 per year since upgrading its heating and hot water systems to plate heat exchangers (PHEs).
 Five Spirax EasiHeat systems now serve the Lanesborough wing of the 1,000-bed hospital. Three provide heating and two deliver domestic hot water in a duty/standby arrangement.
A spokesman for the maintenance team explains that heating was previously provided by three shell-and-tube calorifiers, while four more calorifiers provided hot water. Hence the savings now, which are a combination of improved energy efficiency and reduced maintenance.
Steam-to-hot-water PHEs deliver heating and hot water on demand, so eliminating the energy losses from hot water stored in calorifiers. In addition, the EasiHeat PHEs include a second pass condensate cooler, which helps to condense the steam and encourage more efficient heat transfer.
As for maintenance, the technician points out that, whereas calorifiers need to be stripped down periodically for insurance inspections under PSSR, whereas EasiHeats are exempt from insurance inspections.
"Everything is integrated into the EasiHeat systems so we can let Spirax Sarco handle all the planned maintenance," says our maintenance engineer. "We don't have them looking after the heat exchangers and someone else looking after other things, such as the pressure reducing sets. It keeps things simple."
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Author
Brian Tinham
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