I'm still really confused about how BBP is supposed to be used. I get the importance of it, but it would seem that if I roast a batch and want to do another batch, the BBP should read the preheat drum temp for the next batch (which might be different than the previous batch) and then do what it needs to do using the PID to stabilize the drum temp to that preheat temp, at which point it should beep. However, as currently implemented I have to set a temp in the BBP profile along with a target drum temp. If that target drum temp is different than the preheat temp of my next batch, the BBP doesn't work right. Also, I may not set the temp right in the BBP--it may be too high to get the roaster to cool. The Bullet takes the automated approach: it uses the preheat temp of the next batch and the PID then adjusts the burner until it measures stable IR and drum temps, at which point it says to charge. Currently, I have given up using the BBP on my Roest. Instead, I open the charge gate and let the machine cool to below the preheat temp, then close it and let it come up to that temp. It is not ideal.
I understand the confusion but the different approaches come from how the energy is transferred in these systems. The bullet warms up the drum and then the beans while the ROEST warm up the air and this in turn heats the beans. I have limited info on how BBP works on the bullet, but our idea is that the drum is at its warmest at the end of the roast, and stabilizing at a lower drum temp is the easiest and most energy-efficient way of using the BBP. Heating to a higher drum temp requires a lot of energy that's not really doing anything for the roast anyway. If you want more heat at the beginning og the roast the best is to add more heat through the profile. Personally, I use a very simple BBP. I set the air temp to be maintained at 220degree celcius - this allows the drum temp to stabalize at around 160 degree after a few minutes. If I want a shorter BBP I set my target to be higher but this then requires the next batch to be charged when the buzzer goes off as the drum temp will continue to drop. We are by the way not finished with the BBP and will develop it further based on feedback. For exampel, the BBP will eventually be a part of the individual profile.
@@ToddJohnson15did you get any results? I have also a Bullet. The drum heat is perfectly regulated but the air temp (bean probe) will vary from batch to batch (thermal energy). And that is the most critical one to get a consistent roast.
I'm still really confused about how BBP is supposed to be used. I get the importance of it, but it would seem that if I roast a batch and want to do another batch, the BBP should read the preheat drum temp for the next batch (which might be different than the previous batch) and then do what it needs to do using the PID to stabilize the drum temp to that preheat temp, at which point it should beep. However, as currently implemented I have to set a temp in the BBP profile along with a target drum temp. If that target drum temp is different than the preheat temp of my next batch, the BBP doesn't work right. Also, I may not set the temp right in the BBP--it may be too high to get the roaster to cool. The Bullet takes the automated approach: it uses the preheat temp of the next batch and the PID then adjusts the burner until it measures stable IR and drum temps, at which point it says to charge. Currently, I have given up using the BBP on my Roest. Instead, I open the charge gate and let the machine cool to below the preheat temp, then close it and let it come up to that temp. It is not ideal.
I understand the confusion but the different approaches come from how the energy is transferred in these systems. The bullet warms up the drum and then the beans while the ROEST warm up the air and this in turn heats the beans. I have limited info on how BBP works on the bullet, but our idea is that the drum is at its warmest at the end of the roast, and stabilizing at a lower drum temp is the easiest and most energy-efficient way of using the BBP. Heating to a higher drum temp requires a lot of energy that's not really doing anything for the roast anyway. If you want more heat at the beginning og the roast the best is to add more heat through the profile. Personally, I use a very simple BBP. I set the air temp to be maintained at 220degree celcius - this allows the drum temp to stabalize at around 160 degree after a few minutes. If I want a shorter BBP I set my target to be higher but this then requires the next batch to be charged when the buzzer goes off as the drum temp will continue to drop. We are by the way not finished with the BBP and will develop it further based on feedback. For exampel, the BBP will eventually be a part of the individual profile.
@@trondsimonsen6805 I will have to try that. I shoot for 160C before each roast with the standard inlet profile.
@@ToddJohnson15did you get any results? I have also a Bullet. The drum heat is perfectly regulated but the air temp (bean probe) will vary from batch to batch (thermal energy). And that is the most critical one to get a consistent roast.