What is the temperature? Here, it’s 91 ° F at 5:55 PM
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California temperatures hottest, driest in 120 years
Comments (38)Earlier, some of you were discussing the beautiful small towns that have been abandoned...and that's true in our area, too. Maybe not as much as the Mid-west, but the mountain areas (eastern Washington state) also has large farming areas, with many abandoned small towns. I know many people move to the 'coast' because that's where many of the businesses (and jobs) seem to be. But, in the age of computers...why aren't more people moving to inexpensive, lovely and green towns...and faxing in the work? Just an observation. As for the drought, I am so sorry that your water is being shipped off to parts unknown. We pay higher electricity rates, because much of our power is shipped to California, so I know a little of that frustration...especially with our winter heat bills skyrocketing. When you have snow and below zero temperatures (and too many cloudy days for effective solar) you have to pay the electric bill!...See Morediff between heat pump & aux lockout temperatures in dual fuel
Comments (45)No problem and I appreciate you being ok with me bumping into your exchange here- I am following this with alot of interest. Just quickly, on my issue, the installer came back out. At first he said this was normal as shared earlier and had to be told (from a non-expert) that this was not normal at all. It seems that he made some type of wiring adjustments (unknown since my wife cant follow any of this when she was watching and asking) and then adjusted settings within the setup of the Edge Thermidisstat. We are currently running oil heated-water baseboard as the backup and then the Performance series HP system (EER 12.5, SEER 15.5 and HSPF 9) cant find the AHRI# handy. Temps have been consistently at between 28 and 34 degrees here in Viginia for the last 5-7 days. We are having to manually switch from HP to the oil heat system for right now since I dont want this installer messing with anyting else to connect a relay that allows both to be working from the one thermostat. I will do that later (hence reason for following this discussion closely) I am tracking kW useage off the meter. Here's what I am seeing: Set the HP Edge at 68 degrees and it holds house temp steady wihtout having to use AUX at all. Set the oil heat-boiler at 66 setpoint(manual) It seems that only infrequently will the boiler kick on to augment the HP (running simul right now) Energy useage has been between 3.12 and 3.77 kW per hour across last 5 days (taken in 24 hr periods). VaPOwer is at about .06 cents per kW right now I think, so I'm looking at what 744 hours per month at avg 3.44 kW (.20 cents) per hour= $153.00/month. This is for a brick ranch, 1820 sq ft house...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 MoreShort soil temperature study
Comments (9)How convenient! I was just doing some temperature measurements this afternoon for my own study. I did it a bit differently, but perhaps the data may still be helpful for you. My measurements seem to be quite in line with what was written by Evergreen Gardenworks. I've always been a bit worried about soil temperatures, but have been thinking that Mesembs and small succulent plants have shallow root systems that would see a significant rise in temperatures during normal days. On hot days like today, 33°C / 91°F by the weather station, pot temperatures are definitely higher than I would like. I would prefer to put my larger pots in front (since there is more soil to shield the roots), but then the smaller pots would lose out on light in the back. Note that my growing area gets full sun nearly the whole day (05:43 to 21:13 yesterday). Here are my rooftop results, taken with an infrared thermometer in full sun at 3pm today: There were slight variations between temperatures of pots of different sizes, but overall it was quite consistent. Based on my basic knowledge of thermodynamics, I would reasonably assume that the temperature gradient of a pot from cool-to-hot side is ~linear. 36°C / 97°F Ambient Temperature 47°C / 117°F Pot Side in Sun 36°C / 97°F Pot Side in Bright Shade 31°C / 88°F Pot Side after Misting with Water 70°C / 158°F Deck Surface in Sun 39°C / 102°F Deck Surface in Bright Shade 53°C / 127°F Top Dressing White 55°C / 131°F Top Dressing Gritty Mix 63°C / 145°F Top Dressing Brown Top dressings are shown below - white / gritty (typical sample) / brown: Pots were last watered 2 days ago, so I expected them to be fairly dry. Many plants showed signs of thirst. My moisture sensor reading was 14%. At 6pm, 3 hours after very thorough watering, I have re-checked pot temperatures. Moisture sensor reading is now 27%. The differences were in the tenths of a degree, so I considered them essentially the same. 31°C / 88°F Ambient Temperature 32°C / 89°F Water Temperature 31°C / 88°F Watered Pot Side in Shade 31°C / 88°F Completely Dry Pot Side in Shade (Control pot) The exception is a Lithops clump that I repotted and put out at 4pm, also measured at 6pm. 24°C / 75°F Watered Pot Side in Shade The soil mix and pot were in the garage at 24°C / 79°F. I used cool water and flushed until the water ran clear, since my ambient temperature water had a small quantity of fertilizer in it. Conclusions? Well... no surprises here honestly. But it is quite interesting! Try to use lighter top dressings. Don't put your smaller pots on the outside if you can help it. Watering your pots won't help you get better than ambient, unless you use cool water. Shading your pots gets them to about ambient temperature. Full sun exposes your pots to about a +10° temperature rise. Misting the sides of your pots does help (cooling by evaporation). Hopefully others can post their findings and maybe you'll have some updates too, ez!...See More- last yearlast modified: last year
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