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If I may ask a related question , While the infra red excites the lattice bonds and produces heat and the visible light photons interact at an electron level , what happens to the photons that are not then released as reflected light , ie a dark or black object ? Do they not provide enough...

Any Help is appreciatted

I am still trying to assess the ability of the sun to heat a house through glass and I am a bit stuck . Most solar flux /radiation measurements I have found are based on a total of direct and diffuse radiation on a horizontal surface and then formulated for vertical surfaces with some cosine...

I am leaning further to the net based calculator now. But does anyone have any knowledge of gain figures or any idea where to find them Kev

I am doing a few calcs regarding heat gain through windows and I am looking fot some typical values to apply for vertical surface NSE&W. I currently have figures from a glass manufacturer, a net based calculator and the BRE standar assesment proceedure ( for energy rating houses). All three...

Thanks for the help I have sussed now that the figure relates to the rate of energy transfer and that the amount of energy transfered is calculated by the the timescale . I probably was being thick, but at the time I just couldn't see it . Kev

u values ....W/M2/K I am getting confused by the definition of the u-value . I want to do some calculations for heat loss but I do not understand the timescale for the U- value calcs I understand that a U value describes the energy in watts that is lost per Sq Mtr for each degree (K)...

I realise that this thread has been dormant for a while , and I have no scientific knowledge as such but by observation ..... If a rainbow were to be projected into a full circle the circle seems to complete itself at my feet . I noticed this particularily when driving in spray that the...

Ok so Ive tried lots of searching ...but... it doesn't seem to hone in on my thinking which isss... I play bass guitar and different people have different views on how much to stretch their strings to attain alevel where their style of play wil allow the strings to bend and sound great whilst...

Many thanks

simple school boy stuff ....... I know matter cannot be created or destroyed but is the same true of energy Ive tried searching but.........:frown: I'm sure there is a definitive answer :wink: but I await your most knowledgeable replies thanks in advance

It might seem daft but is the resonant frequency of the cardboard the issue here ??