Temperature Rise of Water
50°C rise in 100 litres of water takes 6 hours at 1 kw, therefore if we have a 3 Kw heater to raise the temperature by 50 degrees it would take 2 hours.
A 40°C rise in 100 litres would take four-fifths the time at 3kw, or 96 minutes.
with the same heater. 50 litres could be heated through 40°C in half this time, 48 minutes, and so on.
Our standard large pasteuriser has 3 x 3 kw water heaters = (kw)
An example with our large pasteuriser from cold start with the pasteuriser holding approximately 120 litres of water at a temperature at 16º C and with 8 baskets of 750 ml chilled carbonated bottles (approximately 84 litres of liquid and cold glass bottles!!), with water up to the bottle fill line, equates to approximately 200 litres to heat through plus the cold bottles. This took 100 minutes to reach over 71 º C .
A temperature rise of 0.5 degrees per minute were left in for the pasteurisation period, in this case was 20 minutes. Then taken out and replaced with new baskets of bottles which took just over 30 minutes to reach the pasterisation temperature and stayed in for 20 minutes.
So you can see the initial time for the temperature rise from cold is longer at the start of the day then the time for the temperature to get to the required degrees thereafter. Hence the reason why we switch on the pasteuriser before we need it to get it up to operating temperature.
Safety in use
During the heating process, the pressures inside the bottles increase. Occasionally due to carbonation/internal pressures, flaws within the bottle or closure, or incorrect handling during bottling, a bottle or closure may explosively fail. To mitigate the risks of this we recommend always keeping the lid closed when bottles are in the pasteuriser with the exception of when adding or removing them.
Proper PPE equipment should be worn by the operator – this should include a chainsaw/strimmer mesh full-face guard, heavy duty insulated waterproof gauntlets and heavy duty rubber apron.
The pasteuriser should never be operated without water covering the elements by 50mm, or you will destroy the heating elements.
We use baskets because it makes it easier to load and unload the pasteurisers.
Of course you will get a lot more bottles in the units if placed loose. It is a trade off against ease of use and maximum capcity, and lets be honest, we all like an easier life!