Estimated savings in extended commercial spaces
The amount of energy required to heat any room in a commercial environment varies with respect to:
- Volume of space to be heated (length x width x height);
- Desired ambient temperature;
- Levels of door and window sealing;
- Levels of insulation.
Applying heat engineering industry standard formulae, the energy required in Kilowatts (Kw), according to the volume of a room, is shown in the table below: Insulation alone can reduce the energy requirement by around 33%.
Heat energy required in Kw by room volume
| Insulation status | Room volume in cubic metres |
| 25 | 50 | 100 | 150 | 300 | 400 | 500 | 600 |
| Energy requirement in Kw |
| No insulation | 2.25 | 4.50 | 9.00 | 13.50 | 27.00 | 36.00 | 45.00 | 54.00 |
| emi-insulated | 1.87 | 3.75 | 7.50 | 11.25 | 22.50 | 30.00 | 37.50 | 45.00 |
| Fuly insulated | 1.5 | 3.00 | 6.00 | 9.00 | 18.00 | 24.00 | 30.00 | 36.00 |
Heat Flow Dispersion
Heat flow pumps recycle heat to a specific point near to the floor. As the volume of a room increases so does the floor area. So, the degree of heat flow disperses horizontally across the whole space declines. The degree of lateral dispersion of warm air is increased by raising the volume of throughput of warm air compared to the volume of the space as well as by increasing the number of heat flow systems serving the space. The higher the volume of throughput and number of systems the more heat is recaptured and the greater the horizontal dispersion.
Potential energy savings with Heat Flow Pump warm air throughput
& indicated Heat-Wave pump and number
| Heat pump flow volume/hour as % of total space volume | Room volume in cubic metres |
| 25 | 50 | 100 | 150 | 300 | 400 | 500 | 600 |
| Potential savings as % of heat energy requirement |
| 100% | 15% | 15% | 15% | 15% | 15% | 15% | 15% | 15% |
| 150% | 20% | 20% | 20% | 20% | 20% | 20% | 20% | 20% |
| 200% | 30%-35% | 30%-35% | 30%-35% | 30%-35% | 30%-35% | 30%-35% | 30%-35% | 30%-35% |
| Heat-Wave Pump & number | 1xHW100 | 1xHW350 | 1xHW350 | 1xHW350 | 2Xhw350 | 3XHW350 | 4XHW350 | 4XHW350 |
As can be seen the amount heating energy saved rises with the volumetric air flow of the heat flow pump. By increasing the amount of air transferred each hour to twice the rooms volume (200%) the best maintenance of temperature at the lowest energy requirement can be secured. Beyond that it is necessary to add heat flow pump systems to maintain the rate of saving.
Under controlled testing we have achieved a 37.5% reduction in energy consumption reducing power requirements of a convection heater from 2.00 Kw to 1.25 Kw with a space temperature of 20oC to 21oC. However, under the possibker range of practical scenarios and space conditions we would not suggest that this level of saving can be attained because all rooms are different. Therefore, the saving figures in the table are a range within which likely achievement will fall.
Energy bill components
Please remain aware that this discussion relates to Heat Flow technology impacting room or commercial space level heating economy and this can have no impact on energy consumed for lighting, hot water or kitchen tasks (white goods devices).
Also, please note that total bills include a standing charge which varies with energy supplier and which this technology cannot impact.
As a very rough guide heating bills in winter are made up roughly 70% heat energy and the rest is made up of other devices/uses and a standing charge. Therefore, a 30% drop in heat energy consumption would reduce the total energy bill by around bill 21% in the case of each room heated, but this is still a substantial saving leading to the Heat-Wave system paying for itself.
Some savings estimates
In an insulated space in a restaurant or pub with a high ceiling and with a large spatial volume of 400 cubic metres the power consumption would be around 24Kw so over a 14 hour day the value of consumption assuming a 35p/Kw electricity commercial tariff would be £117 or £3,510/month.
The expected daily savings achieved would be in the range of £17.55 to £40.95.
This represents a monthly saving of between £526 and £1,228.5.
Over an accumulated cold day period of 6 months in the year this represents a range of savings of £3,156 to £7,371.
The cost of the Required 3 HW/350 heat pumps is £825 and the energy consumption of these pumps would have been 0.034 x 12 x 30 x 6 months = £27 in rounded figures giving a net annual saving of between £3,126 to £7,340.
This means the systems pay for themselves within 2 months of operation from savings.
Large commercial space volumes
We are aware that some commercial show rooms, pub-restaurants and convention centres have larger space volumes. These can be handled by Heat-Wave on a case by case basis and we welcome phone calls to discuss any specific requirements
Space height variations
Although our kits come with a 3 metre flexible ducting we can supply extensions to cater up to space heights of up to 10 metres.
Any questions?
Just give us a call Telephone: 07 760 444 625
