{"id":13,"date":"2012-01-16T14:44:03","date_gmt":"2012-01-16T20:44:03","guid":{"rendered":"http:\/\/hedgecroft.com\/permaculture\/?p=13"},"modified":"2012-01-16T17:33:10","modified_gmt":"2012-01-16T23:33:10","slug":"mapg-hoophouse-monitoring","status":"publish","type":"post","link":"http:\/\/hedgecroft.com\/permaculture\/mapg-hoophouse-monitoring\/","title":{"rendered":"MAPG hoophouse monitoring."},"content":{"rendered":"

The Madison Area Permaculture Guild has erected a 20′ X 40′ hoop house on the grounds of the Token Creek Eco-Inn<\/a>.\u00a0 As some of you may know, I put a couple of temperature loggers into the hoop house on Nov 27.\u00a0 They filled up January 8, and I just downloaded their contents January 14th to look at them.<\/p>\n

If anyone is a data geek, I can give them the original data, but it was gathered at 30-minute intervals, Temperature in Fahrenheit.\u00a0 I put one in a plastic ziplock hanging on the south side of the hoop house, about 5 feet off the ground.\u00a0 The other was in another ziplock laying on a stack of empty pots on the north side near the entrance. I’ve added a third now, in the shadow of a crosspiece outside on the North.<\/p>\n

To put it in context, I played around with Weatherspark\u00a0 (http:\/\/weatherspark.com<\/a>) for Madison temperatures, and have put together a graphic with both at approximately the same scale for comparison.<\/p>\n

I also had a logger (iButton) in my own little hoop, which is fairly open, it is mostly a shelter for my chickens, is about 6′ tall, 20′ long, and has about 8 square feet of hardware cloth venting, so it does not hold heat in very well.<\/p>\n

Attached is a low resolution version of the graph.\u00a0 The top is from the iButtons, the bottom from Weatherspark.\u00a0 I tried to match the dates and times up, should be fairly close.\u00a0 In case you can’t see it, in the Weatherspark graph, a thick horizontal line is 32 degrees, freezing.\u00a0 I tried to put one in the iButton graph, but it disappeared.\u00a0 The horizontal lines are, from the bottom, 20, 40, 60, 80, 100, 120, and 140 at the top.
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\nAs you can see, it got over 100 degrees on many days on one of the sensors, the other peaked at 80, with highs for one often 25 degrees higher than the other.\u00a0 I forgot to mark which was which, so I would guess that the one on the south got hotter being higher off the ground and in more direct sunlight.<\/p>\n

For the lows, note the coldest night, January 3, 6th from the right (9 degrees according to Weatherspark).\u00a0 The data from the ibuttons recorded 5 and 6.8 those nights, while my hoop recorded 44 as a low that night.<\/p>\n

We put some 55-gal water barrels on their sides, 1\/2 full of water, along the south side of the hoop house inside.\u00a0 I checked these, too.\u00a0 There was thin ice floating on each, so the temp was probably just above freezing in the barrels.\u00a0 There is snow piled up on the south side, the north is clear.
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\nWhat this seems to indicate is that the hoop house has some extremes of temperature, could use some way of storing it to moderate the cold, and even out the fluctuations.\u00a0 Perhaps if the barrels were further from the wall, where they are shaded by the snow, they would be warmer.<\/p>\n

A closer look at January 2-3 shows interesting, if predictable patterns.<\/p>\n

Here the hoizontal and vertical scale are the same, the top graph shows the sun position, next below it cloud cover, then air temperature (probably at the Airport, about 5 miles South)\u00a0 Click for full image.<\/p>\n

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(I added a horizontal line at 32 degrees, and the green and blue lines are from sensors inside and outside my chicken coop at HedgeCroft)\u00a0 Both the ambient temperature and the hoop house responded to the sky clearing late on the 2nd, and bumped back up with the brief cloudiness at around 7pm.\u00a0 The hoop house started a quick rise in temperature just after sunrise\u00a0 (there are no obstacles to the Southeast).\u00a0 I have no clue why the 20 degree drop 9:30-11 AM, though I see a similar dip on many days at a similar time, maybe there is a shadow from an obstruction to the south?\u00a0 I’ll look it over next time I’m out there.\u00a0 If so, it would probably affect the temperature most on cloudy days.\u00a0 Anyway, enough fun for now.<\/p>\n","protected":false},"excerpt":{"rendered":"

The Madison Area Permaculture Guild has erected a 20′ X 40′ hoop house on the grounds of the Token Creek Eco-Inn.\u00a0 As some of you may know, I put a couple of temperature loggers into the hoop house on Nov … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-13","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/posts\/13","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/comments?post=13"}],"version-history":[{"count":6,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/posts\/13\/revisions"}],"predecessor-version":[{"id":26,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/posts\/13\/revisions\/26"}],"wp:attachment":[{"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/media?parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/categories?post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/hedgecroft.com\/permaculture\/wp-json\/wp\/v2\/tags?post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}