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Showing results for tags 'temperature stability'.
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I just recently joined the La Pavoni Lever Machine Owners Facebook page. Some new developments were there that I hadn't seen before. One involved the pre-millenniums adding a plug behind the group head and cutting a hole in the dipper tube to make the group head water heated instead of steam heated. https://www.home-barista.com/repairs/heat-control-of-1984-la-pavoni-professional-t40936-40.html As a side note....IMS SCREENS AND BASKETS FOR LA PAV! YAY!
Ok some geekyness going on here. Having headed down the path of adding some electronic geewhizzery to my new Espresso purchase, I started thinking about other steps to achieving / maintaining ideal temperatures for extraction. Really serious 7L boiler and loadsa massive brass grouphead machines do it by their sheer thermal mass (if thats a correct term), so with a little espresso machine a big issue is temperature drop when you pump cold water in from the reservoir to the boiler. I will be adding electronics to control water temperature more accurately in the boiler but could I give it a helping hand by reducing the differential between the reservoir water temp and boiler water temp I thought. The short answer is yes, if I added a little water heater/stat to the reservoir eg an aquarium one, I can heat the reservoir to 30c as part of the warm up process. Used the aquarium example because you can just go out and buy one and some come with a protective cage so they don`t come in contact with the reservoir body. I would have to ensure that the water intake pipe for the pump was raised to leave some water at the bottom of the reservoir for the heater to sit in. Anyway did the maths for a Silvia and assuming (worst case) that the reservoir water was normally 5c, by heating it to 30c I would reduce the drop in water temperature by 5c in the boiler during a typical 3 oz triple extraction, the drop would be less with a double of course. This of course does not take into account any other variables such as the heater kicking in to raise temp as the extraction takes place. My figures were, water in boiler at 105c before extraction and I got a drop to 85c if water was 5c in the reservoir and a drop to 90c if reservoir water was at 30c, a 25% improvement for about £10-15. Makes you think, well me anyway. Don (currently in mad professor mode)