With the G40 element being 2900W this means it should take 1,290,000 / 2900 = 445 seconds, or 7 minutes 25 seconds to do the job. Theory states that with the specific heat of water being 4200 Joules/Kg/C it should take 4200*10*30 (1,290,000 Joules) to heat 30 litres of water by ten degrees. Next test was to turn the heater and pump on and observe how quickly the G40 could get water up to mash temperatures….at this stage I did not have a jacket or insulation for the G40, and the test was conducted in the arctic conditions of my garage at an ambient temperature of around 5 degrees!! As the volume increased so the water level showed as being higher in the sight glass…so at 30 litres, the level was 2mm above the line…at 46L (which is the practical limit of what can be boiled…even though the vessel can take 55L to the brim) I would estimate the error to be around 4 or 5mm so which roughly equates to 2/3rds of a litre…a discrepancy that is perfectly liveable with. At 8,15 and 20 litres the level of the water was within a meniscus width of the of the line marked on the sight gauge – low, spot on and slightly high in each case respectively. Continuing filling the G40 with known volumes of water, I checked the sight glass at various levels. So, if you add water at a rate of 2.5Litres per Kg and you have 6kg of grain then you will actually need to fill the G40 with 22.4L of water. This value needs to be added to the base liquor calculation when determining the total volume of mash liquor required. Using water, measured out by weight, I initially determined that the recoverable dead space below the malt pipe, was 7.4L. I maintained discipline for all of about 18 hours after unboxing, before I started playing, first filling with water at various levels in order to determine various dead spaces, and to check the accuracy of the sight gauge that is built in to the recirculation pipe, before heating up to see how quickly it raised the temperature and to also check the accuracy of the temperature probes. Posted on 27 January 2022 7 February 2022 by Nick Davis
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