Kelly Pridgen

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since Jan 20, 2017
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Recent posts by Kelly Pridgen

I’m new to this. Seems like the primary purpose of the heat pipes isn’t to move heat up (that happens naturally). It’s more to help circulate the air and move heat down (not natural) to prevent greenhouse from becoming too hot. Likely will do some of both.

I believe for heat pipes to function they will need to be dry. Might be problem in my soil. During wet springs soul is saturated and I get standing water in a 1-2 foot hole. Perhaps the umbrella would prevent this.
2 months ago
Hi Joseph,
On your seed sharing website you state:

“I highly recommend starting potato seedlings via the wintersown method.”

Can you please detail exactly how you do this with potatoes? Is it similar to how you describe doing it with garlic on another thread? Why is it better than starting them indoors?
Thanks!
2 years ago
Thanks, Peter.
A couple more questions on using a plunger tube made of brick inside the bell.
1. Does the external surface area of the brick plunger tube count towards the total ISA of the bell?

2. I'd prefer to keep it simple with a 8" square plunger tube (for 8" batchbox). Hope square is ok. I understand the factors that make a round (or octagon) shape better in the riser, but do they apply for the plunger tube?
3 years ago

Peter van den Berg wrote:A dead end bench of that size would work, provided it is constructed as shown on the website.



I like the concept of using a plunger tube made with brick in one corner of the bell. The key would be in making the opening as low to the floor as possible in order for the dead-end bench (I'm only making one) to function properly.
I believe this would negate the need for the baffle board.
Is my thinking correct?
3 years ago

Peter van den Berg wrote:
Good question! The workings of a bell relies on the difference in volume between the exhaust (and inlet) pipe and the bell. To see what the difference is, take a cross section area of the bell/bench where a column is and compare it to the csa of the exhaust. The resulting figure should be at least 5 times the pipe's csa, preferably more. In other words: the smaller the bell, the less the gases are able to slow down and stratify, separating the hotter form the colder gases. One column every 4 feet won't affect the bell's aerodynamics much, but every 1 foot does.



Peter,
I am building an 8" batch box. I am planning the bell to have a dead-end bench, similar to the one on your web site.
Does what you say above apply to heat/gases flowing into the bench?
The CSA of the bench will be 160 in2, which is only 3+ times the exhaust (and inlet) CSA. Is this a problem? Do I need to enlarge the CSA of the bench for it to perform properly?
3 years ago
I am building an 8" batchbox.

I would like to use an existing chimney that has an oval shaped flue (see photo).
By my calculations the CSA of this oval is exactly the same as an 8" circular flue.

Question: How much will the oval shape of flue (instead of circular) affect performance?
3 years ago
Peter,
One more question (hopefully last).
What should the height of the steel threshold at the front of the box be?
3 years ago
Peter,
Thank you so much for your work and sharing.
I'm planning an 8" batchbox using your plans. I've been studying your site and the section on the floor channel. Very well done, except I can't seem to find specified what the height of the vertical part of the channel should be?
3 years ago