Winegrowers Supplies - Chillers and heat exchangers
Portable chilling / heating units: easy to move around and attach to cooling jackets, or to internal cooling snakes/plates/coils, on one tank or a series of tanks, for:-
The following units are manufactured in Germany.
Calculating the power/size of Chilling unit necessary:-
The following are key features to consider:-
1) container size (small tanks have more surface area and ferment faster)
2) cellar temperature: ambient temperature
Delta (= the temperature difference for cooling).
Then Delta x tank volume in litres = required kilocalorie/hour.
Dividing this value by 860 gives the required kWatt per hour to cool down in one hour.
This value is then divided by the number of hours over which you wish to cool,
e.g. in 24 hours: 15 x 3000 / 860 / 24 = 2.18 kWatt
gives the required performance of the chiller if you wish to bring 3000 litres down from 25 °C to 10 °C in 24 hours.
The manufacturer says:-
Cold (tartrate) stabilisation of wines with very high alcohol content requires about 1 week at -4 °C.
Wines with lower alcohol content need about 10 days at 0 °C (less alcohol cools faster).
The cooling performance decreases greatly at the low temperature range; by up to 10/20% of rated power.
For cold stabilisation their advice is to choose 2 x the nominal power requirement. So for example:
- for 3000 litres, 15 °C wine temperature to be brought down to 0°C, in 24 hours: 15 x 3000 / 860 / 24 = 2.18 kWatt x two,
or with 2.18 kWatt it would take 48 hours, or you can chill 1500 litres at a time if you want to cool down in 24 hours.
For planning a cooling system for cooling fermentation the following general advice applies for white wines:-
up to 15,000 litres Chill 25
up to 20,000 litres Chill 35
up to 25,000 litres Chill 45
Compact, shelf-top units, easy to set-up and use, equipped with a
hermetically sealed motor-compressor and a cooling water/glycol circuit containing water tank and centrifugal pump:-
• Available in these models:-
Chill 25: 705 x 510 x 450 mm, cooling capacity 2.4 kW, 18 litre open tank, 2649 Euros
Chill 35: 755 x 600 x 500 mm, cooling capacity 3.5 kW, 30 litre open tank, 3075 Euros
Chill 45: 755 x 600 x 500 mm, cooling capacity 4.5 kW, 30 litre open tank, 3390 Euros
• Cooling capacities quoted are at 17 °C temperature difference (+32 °C to + 15 °C)
• Electrical connection: 220-230V/1Phase/50Hz
Low temperature option, allowing cooling to negative temperature (to - 10 °C) for cold stabilisation, 700 Euros extra
In operation they produce a lot of warm air, taking in lots of cool air, so ideally should be in a room adjacent to the tank room which will benefit from heating.
The open tank which is filled with the coolant liquid, can be filled with water only, however, using a water/glycol mixture allows much lower temperatures to be achieved and also gives frost protection in the winter. They say that the glycol should be 'food grade'. A mixture of 30% glycol and 70% clean water is sufficient. The total volume, in the tank, connecting tubing and cooling-jackets, may be 30 to 40 litres.
The connecting tubing, in a ring circuit, should be 19mm internal diameter, with T-pieces to and from each cooling jacket. The cooling-jackets should have 1" or ¾" bsp thread hose-tails on inlet and outlet (at top). To avoid wasting power the tubing should preferably be insulated, using normal pipe insulation.
Larger models, 400 volt 3-phase, these can chill down to - 10 °C:-
Chill Max 50, cooling capacity 6.4 kWatt, 30 litre tank, 4620.00 Euros
Chill Max 90, cooling capacity 10.7 kWatt, 30 litre tank, 5550.00 Euros
Chill Max 110, cooling capacity 12.7 kWatt, 30 litre tank, 6940.00 Euros
or the MCK series, high efficiency, prices on request.
The following fittings are needed, for example for 4 tanks:-
1 x overflow prevention kit @ 159 Euros, needed if the unit is installed lower than the cooling jackets.
4 x FermFix temperature controllers @ 167 Euros each.
4 x Connection boxes with relay @ 65 Euros each
4 x Electrical cables (10 metre) with plug for solenoid valve @ 27 Euros each
1 x Transformer (24 V) for up to 10 FermFix regulators @ 108 Euros
Assembling the electrics ready for installation @ 180 Euros
4 x Solenoid valves ¾" (24 V) @ 117 Euros each
4 x In-line-filters ¾" (300 micron), install just before the solenoid-valve, @ 20 Euros each
Assuming the cooling-jackets have 1" bsp male threads:-
8 x Bows 90°: 1" female to 1" male, for jacket inlet and outlet so that the hoses go downwards, @ 2.75 Euros each
8 x Hose-connectors: 1" female to 20 mm hose, good rubber seals @ 3.35 Euros each
8 x T-pieces: three ¾" female threads, @ 3.85 Euros each
22 x Hose-connectors for T-pieces: ¾" male to 20 mm hose, @ 2.50 Euros each
2 x Blank off plugs: ¾" male, @ 1.85 Euros each - for the last tank T-pieces.
You will need lots of ptfe tape for the bsp threads.
Wine-quality PVC hose, non-toxic, clear with a terylene reinforcing web:-
20 mm internal diameter, 3.5 mm wall, up to 3500 litres/hour: 50 metres @ 2.50 Euros per metre
32 x Stainless steel hose clips: 22-30 mm (for 20 mm id hose): @ 2.50 Euros each
In addition you will need 10 to 12 litres of 'food grade' glycol, to make a mixture of 30% glycol and 70% clean water.
Notes on connection of the hoses to the cooling jackets:-
Polypropylene-plastic hose connectors are better than steel at minus temperatures.
Basically: the feed hose goes via a T-piece, then ball-valve/in-line-filter/solenoid-valve/ball-valve, to the cooling-jacket. With the return hose from the cooling-jacket going to another T-piece, and back to the Chiller. Cooling-jackets are connected in parallel.
In detail: assuming the cooling-jackets have 1" bsp male threads:-
Attach the feed hose from the Chiller to a hose-connector (20 mm to ¾" male) fitted in the T-piece,
then to the lower outlet of the T-piece: directly fit the ball-valve, then the in-line-filter, then the solenoid-valve, then the other ball-valve (one ball-valve each side, so the solenoid valve and/or filter can be changed without draining the system),
then a hose connector ¾" female to 20 mm id hose,
then a length of 20 mm id hose to another hose connector (1" female - 90° bow + 1" hose-connector to 20 mm id hose) on the cooling-jacket inlet.
For the return: attach to the the cooling-jacket outlet: 1" female - 90° bow + 1" hose-connector to 20 mm id hose,
then a length of 20 mm id hose, straight downwards,
then attached this hose to a hose-connector (20 mm to ¾" male) fitted in the T-piece,
then a length of 20 mm id hose from another hose-connector (20 mm to ¾" male) fitted in the T-piece, going back to the Chiller.
Each cooling-jacket is connected in parallel, onwards from the T-pieces.
The ¾" plastic blank-off plugs fit into the T-pieces for the feed and return to the last tank. This is so the circuit can be extended easily to add more tanks later.
The solenoid-valve assembly could be on the floor under the tank, with the tubing laying along the floor, so there is no weight pulling it down. Or it could be tied along the ceiling, which would mean that cleaning the floor is easier.
Prices shown are exclusive of Vat.
Delivery usually will need to be charged at cost.