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Its the Cooler for you Herr Grendel - Phase II

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  • #16
    Re: Its the Cooler for you Herr Grendel - Phase I

    Aldi must be an eastern states thing - or perhaps Ive just not been paying attention to recent developments. Im going to look at a number of options - one of which might be just a painted steel or aluminium frame and base and a SS cooling tray - that after all is the only bit in contact with the beans.

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    • #17
      Re: Its the Cooler for you Herr Grendel - Phase I

      One thing I would toss out there to think about in any cooler design is the direction of the airflow from the fan.

      Very few fans are designed to deal with high temps. Bushings melt, grease and oil flow away, and parts can become deformed when fans are subjected to high heat such as from beans fresh from a roaster.

      For this reason Ive designed my cooler to have the fan pushing the air through the beans rather than sucking it through them. Just as much air is moved across the beans and it keeps the heat away from the fan which should give it a much longer life. Setting it up this way also removes the last bit of chaff from the beans as it blows it out of the cooler rather than it blocking the holes as it gets sucked against them.

      Java "Something to think about" phile
      Toys! I must have new toys!!!

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      • #18
        Re: Its the Cooler for you Herr Grendel - Phase I

        I did wonder about that but I am happy the the design of my cooler for 3 reasons -

        surface area - there is a lot of it and the beans cool quickly enough (25 seconds) to not really affect the fan.

        Its designed as an extractor fan for kitchen areas so heat and grease are its lot in life

        chaff gets sucked right through.

        Being a lover of experimentation however I may consider mounting the fan upside down to see how the beans go with a good blowing.

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        • #19
          Re: Its the Cooler for you Herr Grendel - Phase I

          Originally posted by Thundergod link=1158477247/0#14 date=1158666152
          ALDI have a welder on special this week.

          Welder and Mask


          - Arc welder
          - Current: 55-130Amps
          - Thermal cut out
          - Forced cooling for long periods of use
          - Suitable for electrodes between 2.0 and 3.2mm
          - Earth clamp and electrode holder, preassembled and ready to use
          - Thermostatic protection
          - Single phase
          - Includes: protective mask, steel wire brush and scaling hammer


          $ 99.
          Let me Guess its made in the PRC, Might weld SS "Plate" with the correct electrodes, Thin Guage SS is harder to Weld..
          You can Silver Solder as that has been used for Food Grade before the Tig process became Common useage. For Small runs you could use a Mapp Gas torch but for serious welds use Oxy/Acetylene..Buff clean if possible or use mild Nitric Acid..

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          • #20
            Re: Its the Cooler for you Herr Grendel - Phase I

            Ok - the good news. The bean/popper cooler combo slows the popper down by about 2 minutes. The chaff is an issue - bean cooler sucks it down and collects it underneath (is this a bad thing - not sure yet as it does make cleaning easier - may damage fan long term, we shall see).

            The thermocouple and timer are a handy addition and I would recommend their purchase to all others starting out - nothing like hard data to feed curiosity.

            Finally, I took the camera out and got some pics but I WONT add the ones Mrs Grendel took of me - they are like watching a perfectly ordinary person mutate into the Mr Hyde of coffee right before your eyes.


            Not pretty.

            Tonights Coffees were the Bali and a Brazil

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            • #21
              Re: Its the Cooler for you Herr Grendel - Phase I

              Mmmm,

              Those beans look scrumptious, I can almost smell them from here. Good one Grendel [smiley=2vrolijk_08.gif],

              Mal.

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              • #22
                Re: Its the Cooler for you Herr Grendel - Phase I

                Originally posted by grendel link=1158477247/15#17 date=1158667968
                Its designed as an extractor fan for kitchen areas so heat and grease are its lot in life
                While grease and humidity may be its lot, few of these fans are actually designed for high heat. Certainly not for the extreme levels that beans fresh from the roaster can produce.

                With a large surface area on the screen, high air flow, and small bean masses it wouldnt be much if any problem. However, with larger batch sizes and/or a smaller screen area it would be of concern.

                With the large size screen you have I wouldnt expect chaff to be a problem.

                My comment was meant genericly and not specifically about your design.

                Java "Sometimes thinks too much" phile
                Toys! I must have new toys!!!

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                • #23
                  Re: Its the Cooler for you Herr Grendel - Phase I

                  Yep, that is one fine even looking Roast Grendel... nice work :-)

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                  • #24
                    Re: Its the Cooler for you Herr Grendel - Phase I

                    Java,

                    I like your critiques - they keep me thinking and prompt experiments so keep them coming.

                    I took the thermocouple into play last night to get some kind of measure of the heat of the beans as they hit the screen.

                    I suspect the multimeter was not fast enough to register the fall in temp from 200 degree plus down to the 106 it displayed first but I have included the graph below of the cooling of the beans. This is one batch only - obviously I will test repeatedly to build up a more accurate picture of the cooling profile and eliminate anomolies.

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                    • #25
                      Re: Its the Cooler for you Herr Grendel - Phase I

                      Graph looks good.... Grendel.

                      But how did you record the temps you got for the graph??

                      I have the next model up from your Digitech 1521 but its not a datalogger.

                      Those temp changes look too fast to be jotting them down ;-)

                      Belinda

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                      • #26
                        Re: Its the Cooler for you Herr Grendel - Phase I

                        Indeed - not a data logger, but the changes are recorded at a 5 second intervals, plenty of time for smooth pencil action  

                        I would have preferred much tighter collection times but just not possible with that model - A data logging model I see in the future but cant justify it yet.

                        Also I can write without looking where I am writing (i.e. beady eyes locked to the multimeter) - messy as all hell but an A4 sheet is forgiving.

                        In the field I used to go through a lot of a4 notebooks that way.

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                        • #27
                          Re: Its the Cooler for you Herr Grendel - Phase I

                          Beaut work Grendel,
                          Your "profile " for cooling is interesting.
                          Id be keen to see your "profile" for the roast part of the process.
                          If we can agree on the independent variable increments the we might be able to compare bbq rotisserie roast with the bling machine.

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                          • #28
                            Re: Its the Cooler for you Herr Grendel - Phase I

                            Given the roasting time is much longer than the cooling time Id settle for wider increments than 5 seconds (I can maintain that scribble rate for a minute but 10 minutes might be a different story).

                            Perhaps a 20 second increment?

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                            • #29
                              Re: Its the Cooler for you Herr Grendel - Phase I

                              Your on, my next roast is on tomorrow, Ill post results on Monday, there is a big weekend planned at our place.
                              Ill be doing a batch of Peru Chanchamayo followed by the Ugandan Mt Elgon then the Colombian swiss water decaf.(Iknow you dont touch the nancy boy stuff but I like to get in touch with my feminine side)

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                              • #30
                                Re: Its the Cooler for you Herr Grendel - Phase I

                                Andy reckons I need the decaf so Ill have to try in one day. Mind you maybe its because the decaf I have had before was just crap coffee. . .

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