"Affordable warmth assured with Calorex ground
source heat pump"
To prove this point.......Calorex monitored electricity use in a number of houses on two of the first sites in the country to adopt this technology.
One site, of 10 houses, has been continuously measured for 3 years, the second site, of 15 houses, for 2years.
An accumulated total of 600,000 hours of service provision has therefore been recorded and forms the basis of this report.
All the houses were retirement bungalows of similar size, shape, heat loss, occupancy, and usage with underfloor heating and conventional gravity fed hot water cylinders.
Considerable theoretical analysis of the house energy profiles and predicted heat pump performance was carried out in support of this exercise but, more importantly, the promoting Housing Association also provided the electricity and gas meter readings from 3 sites of directly equivalent properties using gas for their heating and hot water.
The results from the 43 houses in this study formed an invaluable control group against which the performance of the heat pump systems could be judged.
Some of the heat pump houses were measured more thoroughly then others, with dual rate meters being connected so that both general electricity and heat pump electricity use could be separately measured during both the 'Day' and 'Economy 7' periods in order to determine the value or otherwise of the use of off-peak tariffs for this form of heating.
Sufficient readings were taken to ensure that both winter and summer energy use could be calculated.
As can be imagined, the amount of data arising from this exercise was considerable and a great deal of useful information has been derived.
Some of this is shown in the attached graphs and histograms but there are a handful of key indicators which are worth highlighting.
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