FORECOURTS AND CONVENIENCE STORES
F or example, the heat recovered from cooling a beer cellar can be recovered back into the space heating for the pub itself. The Marstair GreenHeat system has been used for this very p urpose.
An example of the Marstair Greenheat s ystem redirecting the hot discharge gas through the GreenHeat space heating cassette. This helps recover most of the heat pulled from a refrigerated cabinet and the associated input power from the compressor in a small independent retail store application.
T he case for recovering heat into either hot w ater or space heating needs to be weighed up and costed against one another. In either case the end result will be positive from an environmental point of view and gives a contractor the o pportunity to upsell an installation.
T he justification to the customer can be shown t hrough a reduction in their energy bills and with electricity prices as they are, the payback could be shorter than you think.
We’ll look at a simplistic example to quickly illustrate the potential savings available for a refrigeration system installed into small store recovering heat into space heating with the following assumptions:
■ Shop opening hours per week = 80
(Condensing units will run for short periods when the shop is closed and there may still b e background heating, but we’re keeping this simple)
■ Number of weeks in the year where the store requires heating = 52 x 2/3 = 35 weeks (Refrigerated cabinet will be adding to the required space heating load)
■ E st. running time of the condensing units = 2/3
F irst we calculate the approximated total time w here there is the potential for the heat to be r ecovered from the refrigeration systems in a y ear: 80 x 52 x 2/3 x 2/3 = 185o
Next we calculate the total recoverable heat energy in a year. A standard 3.75m cabinet may have a condensing unit providing 5kW of cooling and has a power input of 2kW, giving a p otential of 7kW of heat available for recovery. T otal available heat to be recovered in a year is therefore estimated to be: 1280 x 7 = 12950kWhrs.
We can now calculate the potential annual r unning cost savings by multiplying recoverable heat by the cost of a unit of electricity. Assuming 1kWhrs (or 1 unit) = £0.12: 12950 X 0.12 = £1550
This is a large cost saving in just one year f or the additional cost outlay of a GreenHeat c ondensing unit with diverted hot gas discharge o ver a standard condensing unit, a GreenHeat h eat recovery cassette, an extra pair of
i nterconnecting refrigeration pipes and a little extra wiring.
The heat recovery system may not replace
your total heating requirement, but it will at least reduce it. This means the net outlay for the heat recovery system is not as much when the reduced outlay for heating is netted off against it on a new install.
To make this offer even more attractive there are schemes available which can help facilitate energy reduction installations available from organisations such as the Carbon Trust
T o conclude, although our industry is at a time of vast change due to the recent implementation of the F-Gas and Eco-Design directives, there is no better time to be looking at the benefits that heat recovery can offer.
T hese benefits can be used not only to help reduce our industry’s Carbon footprint, but also t o help justify and up sell the new equipment requirements that the new F-Gas regulations demand.
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