Heat transfer fluid & refrigerants
Heat transfer fluid
Glycol fluid
The collector side of the heat pump must be filled with a suitable glycol heat transfer fluid.
Tyfocor© L (propylene glycol) manufactured by Tyforop Chemie GmbH can be diluted with water to make it suitable for this purpose and is available from stockists of Worcester FK series of solar panels.
Tyfocor© L is supplied in a 50/50 water/glycol concentration. This needs to be diluted to achieve a ratio of 65% water 35% glycol. For every 25 litre drum of Tyfocor© L used, 12.5 litres of water should be added to the mixture.
40mm OD 35mm ID hose when filled contains one litre of liquid per metre. A single compact collector contains approximately 40 litres of liquid.
| Mixing ratio in litres metre of coil (40/35mm hose) | ||
|---|---|---|
| Product | Water (l) |
|
| Bioethanol | 0.71 | 0.29 |
| Propylene/ethylene glycol | 0.65 | 0.35 |
| Mixing ratio in % by weight | |
|---|---|
| Product | % |
| Bioethanol / water | 25 / 75 |
| Propylene or ethylene glycol / water | 35 / 65 |
Suitable antifreeze solutions are also available from:
Uponor Housing Solutions Ltd, Snapethorpe House, Rugby Road, Lutterworth, Leicestershire LE17 4HN
Tel: 01455 550355
Hydra Tech, Units 3/6 Queensway Centre, Swansea West Industrial Park,
Fforestfach, Swansea SA5 4DT
Tel: 0870 7446395
Refrigerants
The refrigerant circuit in Worcester Greenstore ground source heat pumps is filled with R407C. Under normal conditions there should be no requirement for refrigerant handling. The refrigerant must only be handled by trained and accredited operatives.
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