well as the strips 111 are interposed between opposite side plies of a woven mesh panel 113 which may be in the form of chain link fencing in addition instead of the strips 111 being lengthwise tensioned by the springs 142 the hooked end portions 134 of the hooks 132 are engaged with opposite side marginal portions of the woven mesh panel 113 in this manner the opposite side plies of the woven mesh panel 113 are tensioned by the springs 142 and the ply of the woven mesh panel 113 which overlies the upper surfaces of the strips 111 causes the strips 111 to be bowed over the pipe sections 160 thus the contact between the longitudinal mid portions of the strips 111 and the opposing surfaces of the pipe sections 160 is greatly increased referring now more specifically to fig8 through 11 of the drawings there will be seen a third form of solar energy collector referred to in general by the reference numeral 210 and whose components corresponding to various of the components of the solar energy collector 10 are referred to by corresponding numerals in the 200 series the panel 228 differs from the panel 28 in that the pipe sections have a first set of wide metal strips 221 extending therealong and disposed over the upwardly facing sides of the pipe sections 260 then thinner metal strips 223 are alternately.