Solar heat collecting pipe

Abstract

[Problem] To present a solar heat collecting pipe capable of enhancing the heat collecting efficiency by suppressing the dissipation of energy transmitted to the heat medium passing through the inside of an inner pipe. [Solving Means] In the solar heat collecting pipe 1 including the inner pipe 11 for receiving sunlight collected by the light collecting mechanism 2, and transmitting energy to the heat medium 14 passing through the inside, and the outer pipe 12 covering the outer circumference of the inner pipe 11, a solar heat absorbing film 11 a is applied in a portion exposed to sunlight of the inner pipe 11 of the solar heat collecting pipe 1 (the portion exposed to the reflected light of the sunlight at least on the surface of the inner pipe 11, and a heat reflecting film 11 b is applied in a portion not exposed to sunlight from the light collecting mechanism 2.

1 . A solar heat collecting pipe comprising an inner pipe for receiving sunlight collected by a light collecting mechanism, and transmitting energy to a heat medium passing through the inside, and an outer pipe covering the outer circumference of the inner pipe for forming a heat insulating space, wherein a solar heat absorbing film is applied in a portion exposed to sunlight from the light collecting mechanism at least on the surface of the inner pipe, and a heat reflecting film is applied in a portion not exposed to sunlight from the light collecting mechanism. 
     
     
         2 . The solar heat collecting pipe according to  claim 1 , wherein a solar heat absorbing film is applied to the entire circumference of the surface of the inner pipe, and a heat reflecting film is applied to a portion not exposed to sunlight from the light collecting mechanism. 
     
     
         3 . The solar heat collecting pipe according to  claim 1 , wherein a solar heat absorbing film is applied to a portion exposed to sunlight from the light collecting mechanism of the inner pipe, and a heat reflecting film is applied to a portion not exposed to sunlight from the light collecting mechanism. 
     
     
         4 . The solar heat collecting pipe according to  claim 1 , wherein the solar heat absorbing film is composed of a chrome oxide layer. 
     
     
         5 . The solar heat collecting pipe according to  claim 1 , wherein the heat reflecting film is composed of an aluminum foil or thin plate. 
     
     
         6 . The solar heat collecting pipe according to  claim 1 , wherein mutually adjacent solar heat collecting pipes are coupled together by forming threads in connection parts of the inner pipes of the solar heat collecting pips, and connecting in non-expanding state by connection members having threads formed at both ends, and a support shaft protruding in the horizontal direction from the surface of the inner pipe near the coupled position is slidably inserted into a slit in a horizontal direction formed in a solar heat collecting pipe support member. 
     
     
         7 . The solar heat collecting pipe according to  claim 6 , wherein the solar heat collecting pipe support member is formed in a groove structure having a ventilation space, for shutting out the sunlight emitted from the light collecting mechanism at an end part of the outre pipe fixed and inserted into the inner pipe. 
     
     
         8 . The solar heat collecting pipe according to  claim 7 , wherein the light collecting mechanism is a trough type reflector having a parabolic section, and the solar heat collecting pipe support member is affixed to the reflector, and the reflector and the solar heat collecting pipe are oscillatably mounted on a platform by way of a common oscillating shaft. 
     
     
         9 . The solar heat collecting pipe according to  claim 6 , wherein the light collecting mechanism is a trough type reflector having a parabolic section, and the solar heat collecting pipe support member is affixed to the reflector, and the reflector and the solar heat collecting pipe are oscillatably mounted on a platform by way of a common oscillating shaft. 
     
     
         10 . The solar heat collecting pipe according to  claim 4 , wherein the heat reflecting film is composed of an aluminum foil or thin plate. 
     
     
         11 . The solar heat collecting pipe according to  claim 2 , wherein the solar heat absorbing film is composed of a chrome oxide layer. 
     
     
         12 . The solar heat collecting pipe according to  claim 11 , wherein the heat reflecting film is composed of an aluminum foil or thin plate. 
     
     
         13 . The solar heat collecting pipe according to  claim 3 , wherein the solar heat absorbing film is composed of a chrome oxide layer. 
     
     
         14 . The solar heat collecting pipe according to  claim 13 , wherein the heat reflecting film is composed of an aluminum foil or thin plate. 
     
     
         15 . The solar heat collecting pipe according to  claim 2 , wherein mutually adjacent solar heat collecting pipes are coupled together by forming threads in connection parts of the inner pipes of the solar heat collecting pips, and connecting in non-expanding state by connection members having threads formed at both ends, and a support shaft protruding in the horizontal direction from the surface of the inner pipe near the coupled position is slidably inserted into a slit in a horizontal direction formed in a solar heat collecting pipe support member. 
     
     
         16 . The solar heat collecting pipe according to  claim 15 , wherein the solar heat collecting pipe support member is formed in a groove structure having a ventilation space, for shutting out the sunlight emitted from the light collecting mechanism at an end part of the outre pipe fixed and inserted into the inner pipe. 
     
     
         17 . The solar heat collecting pipe according to  claim 15 , wherein the light collecting mechanism is a trough type reflector having a parabolic section, and the solar heat collecting pipe support member is affixed to the reflector, and the reflector and the solar heat collecting pipe are oscillatably mounted on a platform by way of a common oscillating shaft. 
     
     
         18 . The solar heat collecting pipe according to  claim 3 , wherein mutually adjacent solar heat collecting pipes are coupled together by forming threads in connection parts of the inner pipes of the solar heat collecting pips, and connecting in non-expanding state by connection members having threads formed at both ends, and a support shaft protruding in the horizontal direction from the surface of the inner pipe near the coupled position is slidably inserted into a slit in a horizontal direction formed in a solar heat collecting pipe support member. 
     
     
         19 . The solar heat collecting pipe according to  claim 4 , wherein mutually adjacent solar heat collecting pipes are coupled together by forming threads in connection parts of the inner pipes of the solar heat collecting pips, and connecting in non-expanding state by connection members having threads formed at both ends, and a support shaft protruding in the horizontal direction from the surface of the inner pipe near the coupled position is slidably inserted into a slit in a horizontal direction formed in a solar heat collecting pipe support member. 
     
     
         20 . The solar heat collecting pipe according to  claim 5 , wherein mutually adjacent solar heat collecting pipes are coupled together by forming threads in connection parts of the inner pipes of the solar heat collecting pips, and connecting in non-expanding state by connection members having threads formed at both ends, and a support shaft protruding in the horizontal direction from the surface of the inner pipe near the coupled position is slidably inserted into a slit in a horizontal direction formed in a solar heat collecting pipe support member.