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From the basic explanation of how a heat pump works, it should be clear that the
refrigeration gas cycle will absorb more energy when the outside ambient temperature
is hotter (i.e. when there is more energy available). This section will advise the user of the
heat pump how to optimise the energy savings by setting up the heat pump timers properly.
The graph below depicts a typical Enerflow heat pump’s saving at certain atmospheric
air- and inlet water temperatures. In this picture it can be clearly seen that the heat
pump will save more energy (i.e. money) at higher outside air temperatures.
The picture below depicts the typical average daily ambient temperature on an hourly
basis for South Africa
(reference: www.worldclim.org).
In the picture it can be seen that the temperatures is at its lowest during the late
evenings and early mornings. Therefore, it is recommended that the heat pump be
operated as little as possible during these colder periods of the day (i.e. between 11PM
at night to 8AM in the morning).
How to optimise energy efficiency
8.2
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