tag:blogger.com,1999:blog-2249983551893842827.post5162003631305104315..comments2023-10-26T23:39:36.158+01:00Comments on Climate and Stuff: Does Thermal Radiation Travel From Cool To Hot Bodiesthefordprefecthttp://www.blogger.com/profile/07210786222021457913noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-2249983551893842827.post-2809485117257493032016-05-15T01:19:10.873+01:002016-05-15T01:19:10.873+01:00Nice set up! One of the arguments is that a warmer...Nice set up! One of the arguments is that a warmer object can not add "back radiation" from a relatively cooler emitting body because the higher energy, orbital states of the atoms of the warmer body are already filled. That is, the warmer body is constantly emitting photons, whereas any incoming, lower energy photons from the cooler body can not be received, and will simply be reflected and disbursed. <br /><br />How about this scenario: As the warmer body does emit photons, incoming photons from back radiation may immediately fill those vacant states? Even though they are lower energy, ie lower frequency, they might be finding perfect orbital states during the outgoing flux of photons. They would simply be competing at the surface of radiative emission with other photons within the black body that are also trying to get to the surface. Basically, the warmer black body surface doesn't give a hoot where the photons come from. (Scientifically speaking :) )<br /><br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-11932734708671333402013-07-24T21:35:46.978+01:002013-07-24T21:35:46.978+01:00Another set of experiments are here.
http://climat...Another set of experiments are here.<br />http://climateandstuff.blogspot.co.uk/search/label/experiment<br /><br />Still have to do the "ultimate!" experiment but need a controlled environment (better than+-0.1C)<br />cheersthefordprefecthttps://www.blogger.com/profile/07210786222021457913noreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-64625576966661086432013-07-23T10:07:40.940+01:002013-07-23T10:07:40.940+01:00Impressive work. Have you repeated the experiment ...Impressive work. Have you repeated the experiment already? Are you aware of anybody else having conducted such?0^0https://www.blogger.com/profile/09590270703159793784noreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-71313391548099340932013-03-13T04:05:48.827+00:002013-03-13T04:05:48.827+00:00Hot plate side is same construction with and witho...Hot plate side is same construction with and without warm plate. Temperature at start of analysis of hot plate is same with and without warm plate. Convection and conduction from the hot plate should therefore be the "same" with and without the warm plate.<br /><br />The similarity of hot side conditions is shown in the second analysis where the backwall temperature is measured. from 76degC the temperatures of the back wall is about 1degC<br /><br />The warm plate is isolated from the hot plate area by a double glazed window of "cling film". The cardboard walls joining the compartments will transmit very little of the heat. The walls of the compartments are tall to minimise the convection from the warm side changing the convection of the hot side.<br /><br />The main changes between the 2 runs is the radiation from the warm plate passing through the double glazed window.<br /><br />The Hot plate cannot be swapped to the warm plate side as the conditions are different - without the warm plate the side wall is removed to expose the double glazed window to ambient temperature 20C approx black body at 0.3m distant.<br /><br />I fully agree that the experiment needs to be repeated, but I have to get 3 hours of time and the thermal camera! I have an idea to repeat the test using finned heatsinks which if the correct type should "focus" the IR in line with the fins, I think I will also run the camera at 60Hz frame rate to allow a better smoothing and perhaps just record the hot plate (giving a greater area for the camera to average). Don't know when I will get the time and camera simultaneously. It would be better if this were repeated by others thefordprefecthttps://www.blogger.com/profile/07210786222021457913noreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-9796478726070808602013-03-12T19:47:57.415+00:002013-03-12T19:47:57.415+00:00I like the idea of your attempting to demonstrate ...I like the idea of your attempting to demonstrate a rather difficult concept with a simple experiment, but the only thing I think you've shown here is that the "warm" plate has affected the environment of the "hot" plate so that it loses heat more slowly. <br />I think that probably two identical boxes, one for each plate, would be required, and that your experiment would have to be repeated a number of times with varying plate temperatures (even "cold" plates) and varying the distances between the boxes. Also, your experimental results should be repeatable by interchanging hot and warm plates from box to box.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-53215836899654507552013-03-10T22:12:05.386+00:002013-03-10T22:12:05.386+00:00Same temperature as background so it would follow ...Same temperature as background so it would follow the cooling curve of the no warm plate scenario.<br /><br />With the earth you are looking at 2.7K bacgrond temp of space vs the radiation from GHGsthefordprefecthttps://www.blogger.com/profile/07210786222021457913noreply@blogger.comtag:blogger.com,1999:blog-2249983551893842827.post-83832355944243861492013-03-10T21:39:49.537+00:002013-03-10T21:39:49.537+00:00What happens if the cool plate is at room temperat...What happens if the cool plate is at room temperature?A Chttps://www.blogger.com/profile/00625940194809292678noreply@blogger.com