How much heat can be adsorbed in a solar parabolic trough?

How do I know the produced heat on the focal point of a solar parabolic trough per different radius if made from steel and also from glass?

• If you look to the sidebar, several related questions are shown. For example, this one. Also, you may find this question and related answers useful. Please see if that solves your question - or narrow down what you are asking. Right now, it's pretty vague. – Floris Aug 10 '16 at 17:11

1. incident power from the sun is about 1.3 kW / m$^2$ for normal incidence with the sun overhead, no clouds. Depending on the orientation and dimensions of your trough, you should be able to compute the maximum power collected