What is the temperature? Here, it’s 91 ° F at 5:55 PM
2 years ago
last modified: 2 years ago
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Heat pump air temperature
Comments (43)I, too, am having the same problem with a 16 seer 2 speed American Standard (same as a Trane)Heat pump. I have been arguing with the independent dealer for about a month and a half. I keep my house on 68 winter and summer. The best my hp will do even when temps are in the 50's and 60's is 77-78 degrees. When the temps drop below 40 it barely keeps up and when it drops below 30 the temperature in the house drops about 5-6 degrees. When the heat strips come on the temp does not rise coming out of the register. My father has a 10 year old 12 seer Trane that is putting out 95 degree air. My sister has a 15-20 year old unit that is putting out 100 degree air. We all live in the same county in upstate SC. They were getting those temps from their's when the outside temp was below 25F. I sure wish someone could get us an answer....See MoreDark Color Pools and Water Temperature
Comments (18)Well, I can give you a ballpark estimate for the maximum (upper bound) possible difference in temperature of the water between a white surface pool and a black surface pool, but I probably can't give you even a ballpark estimate for the absolute temperature of the pool, that would require too many details of energy balance and energy transport. Let's say that for 4 hours, the sun is roughly directly overhead the pool, so that the black surface at the bottom of the pool basically absorbs ~100% of the sunlight it receives (black asphalt for example would absorb about 90%, so we aren't making a big error here). Assume then that a white surface will reflect ~100% of the energy (a very white substance like snow would reflect ~90% so we aren't making a big error here either). The flux of energy coming from the Sun is ~1400W/m^2, of which ~70% reaches the ground (the other 30% gets reflected by the atmosphere or clouds). Multiplying this by the surface area of your pool: 1400W/m^2*70%*(6m*4m+2*1.5m*4m+2*1.5m*6m)~53,000W of power that could be absorbed by your pool's surfaces. This is definitely an overestimate. Now over 4 hours, that 53,000W corresponds to 220kWh of energy. If all of this energy was deposited into the water (assuming the pool is well insulated from the ground), then this energy would go into heating the water. How much heating is that? Well, the specific heat of water is ~4000J/kg/degree C, so we need to know how much water is in our pool. The density of water is 1000kg/m^3. Multiplying this by the volume of the pool, we have: 1000kg/m^3*(6m*4m*1.5m)~36000kg. Now finally, we find that the temperature difference between a black pool and a white pool is: Δ T m a x = 220 k W h 4000 J k g ∘ C ∗ 36000 k g ≈ 5.5 ∘ C ΔTmax=220kWh4000Jkg∘C∗36000kg≈5.5∘C So, roughly 5.5 degrees of difference at most, which is not bad if you ask me. Reference https://www.physicsforums.com/threads/using-dark-tiles-to-heat-a-pool-via-absorption-of-solar-energy.747600/...See MoreIncredible heat here and I measured root temps
Comments (72)Hi Laura thankyou. I fertilize my tree's twice a week with miracle gro . I don't put a lot but they are on a schedule. Your tree's will be just as large within a couple of years it doesn't take long unless they are on dwarfing rootstock . Thanks Urbo. It's hard to believe that lemon tree came from a cutting. When I bought the cutting it was supposed to be a mandarin when I first found out my Mandarin tree was producing lemons I was kind of disappointed lol but now it's one of my favorites. It's a prolific producer of these huge juicy lemons . I would have loved to have had all my tree's on dwarfing rootstock but you just can't find them here so I guess I will have to keep them trimmed which I will have to do soon or I will end up with a very large trunk with a small top. I hope you find your mandarins I highly recommend either a Tango , any kind of Satuma I love my Minneola it's so sweet right off the tree or a Page classified as a mandarin but tastes like the sweetest orange you have ever eaten has a very complex taste also . Brian...See MoreDiane/anyone, would Augusta Louise prefer some PM shade in my garden?
Comments (36)Lisa, I have dug a lot of roses up over the years, and only in one rose could I definitively see that it had gone own root. This was about 5-6 years ago and involved an Evelyn growing on the side of a slope where the deer would not leave her alone. She had been planted by the landscapers when we first moved here. As I started digging, I could see that there were now two Evelyns, both big and shooting out roots sideways and straight down. Maybe some Dr Huey persisted, but it was not evident to me, and the second E was very much on her own roots and separate from the first. The ground had become like cement as it ways does around here, and the roots just wouldn't quit. I had wanted to transplant this "rose", but finally I was forced to excavate a moon crater--or something similar. It was necessary to hack off a lot of roots, too, and no Huey ever tried to come up in this area. I was unhappy to toss the two E's in the garbage, but at that point I didn't care. I might note that this dig was way worse than the 2017 digging up of a giant PAoK, if you can imagine. Diane...See More- 2 years agolast modified: 2 years ago
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