tag:kipperfrog.blog.co.uk,2009-11-11:/MokoFeed2009-11-11T17:27:50+01:00tag:kipperfrog.blog.co.uk,2006-05-09:/2006/05/09/question19_give_an_account_of_the_types_~786983/kipperfrog2006-05-09T16:06:31+02:002006-05-09T16:06:31+02:00 <p>(a) Passive: adjust surface coating for absorbtivity a & emissivity e to select temperature,T(Kelvin) in solar constant Φ:<br> Heat in from sun + electronics heat = heat radiated away<br> a . sunlit area . Φ + electronics heat =e . total surface area .σ .T4<br> where σ is Stefan Boltzmann radiation constant<br> (b) Active: (in conjunction with passive)<br> mechanical shutters change surface finish - ratio of a to e<br> heat pipes move heat around efficiently<br> heaters stop liquids from freezing (propellant line/tanks) </p> <p> <small> <a href="http://kipperfrog.blog.co.uk/2006/05/09/question19_give_an_account_of_the_types_~786983/#comments">Comments</a> </small> </p>tag:kipperfrog.blog.co.uk,2006-05-09:/2006/05/09/question18_what_are_the_main_heat_inputs~786946/kipperfrog2006-05-09T15:54:16+02:002006-05-09T16:04:06+02:00 <p>Heat Inputs: Solar radiation 1400W/M2 at Earth<br> <a href="http://www.blog.co.uk/srv/media/media_item.php?item_ID=532282"><img src="http://data1.blog.de/media/282/532282_2e401de558_s.gif" align="" alt="solarradiaton" vspace="5" hspace="5"></a><br> Planetary Albedo -reflection<br> <a href="http://www.blog.co.uk/srv/media/media_item.php?item_ID=532319"><img src="http://data1.blog.de/media/319/532319_183b758c29_s.gif" align="" alt="albedo" vspace="5" hspace="5"></a><br> Planet- Infrared<br> <a href="http://www.blog.co.uk/srv/media/media_item.php?item_ID=532324"><img src="http://data1.blog.de/media/324/532324_f3fdd02cf9_s.jpg" align="" alt="Infrared_dog" vspace="5" hspace="5"></a><br> Electronics & other (e.g.RTG)- heat dissipation<br> <a href="http://www.blog.co.uk/srv/media/media_item.php?item_ID=532284"><img src="http://data1.blog.de/media/284/532284_55c1956bec_s.jpg" align="" alt="elec" vspace="5" hspace="5"></a><br> Heat Output: Only Radiation </p> <p> <small> <a href="http://kipperfrog.blog.co.uk/2006/05/09/question18_what_are_the_main_heat_inputs~786946/#comments">Comments</a> </small> </p>