CIBSE Australia and New Zealand 30th Anniversary
30 years and counting! Take a look back at CIBSE ANZ's accomplishments and achievements from the past 30 years.
30 years and counting! Take a look back at CIBSE ANZ's accomplishments and achievements from the past 30 years.
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Heat pump schematic<br />
Sea water<br />
heat exchanger<br />
Sea water out<br />
Image: Isaac Leung<br />
© Steensen Varming, May 2017<br />
Sea water in<br />
Filter<br />
Pump<br />
Heating <strong>and</strong> cooling in winter<br />
Sea water<br />
heat exchanger<br />
Chiller<br />
evaporator<br />
Sea water<br />
out<br />
Chilled water pump<br />
Artificially loading branch<br />
Condenser /<br />
heating pump<br />
Chiller<br />
condenser<br />
Heats in<br />
winter<br />
Air h<strong>and</strong>ling unit<br />
Cools in<br />
winter &<br />
summer<br />
Cooling in summer<br />
Sea water<br />
heat exchanger<br />
Sea water<br />
out<br />
At the time that the Sydney Opera House was built,<br />
cooling towers were normally used to produce<br />
heat rejection for air conditioning. A hot, high<br />
pressure gas starts the refrigerant cycle, passing<br />
into a condenser where it is cooled to become a<br />
high pressure liquid. The liquid passes through the<br />
system where the pressure is reduced, allowing the<br />
liquid to evaporate. The evaporation process absorbs<br />
heat from the water surrounding the evaporator thus<br />
producing chilled water. It is this chilled water that is<br />
used to air condition buildings. Water is used to cool<br />
the refrigerant gas within the condenser, <strong>and</strong> the<br />
heat energy that the water gains in this process is<br />
usually wasted by passing it into the outside air.<br />
In contrast, the Opera House uses sea water to cool<br />
the condenser instead of air. Drawn through a filter,<br />
a pump <strong>and</strong> pipes installed along a series of service<br />
corridors <strong>and</strong> into large heat exchangers, the sea<br />
water cools the condenser water used to cool the<br />
high pressure gas refrigerant which is converted<br />
into high pressure liquid refrigerant. The sea water<br />
which passes through the condenser becomes<br />
warmer <strong>and</strong> is discharged back into the seas.<br />
However, when the Opera House needs hot water<br />
or heating during the winter months, the condenser<br />
water is pumped to the hot water system or air<br />
conditioning plant instead, making use of this energy<br />
that is often wasted.<br />
Chiller<br />
condenser<br />
Chille<br />
evaporator<br />
Chiller<br />
condenser<br />
Chiller<br />
evaporator<br />
21
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