Radiant fluid heater encased by inner transparent wall and radiation absorbing/reflecting outer wall for fluid flow there between

A fluid heating device comprising:

• a transparent annular inner wall forming an internal space for receiving an infrared radiation heating member;
• an annular outer wall spaced outwardly from said transparent annular inner wall to form a fluid passageway therebetween;
• an infrared radiations heating member removably positioned in said internal space so that said infrared radiation heating member can be removed from said fluid heating device without requiring that said fluid passageway be opened;
• said infrared radiation heating member, when positioned in said internal space, being spaced from said transparent annular inner wall such that said infrared radiation heating member is at least partially surrounded by said transparent annular inner wall while avoiding direct contact between said infrared radiation heating member and said transparent annular inner wall;
• and
• a radiation reflection member positioned on the exterior of said annular outer wall so as to reflect infrared radiation, which has passed from said infrared radiation heating member through said transparent annular inner wall, said fluid passageways, and said annular outer wall, back through said annular outer wall into said fluid passageway;
• wherein said transparent annular inner wall is formed in an approximately semispherical shape with a concave recess therein;
• and
• wherein said infrared radiation heating member is U-shaped with at least a portion thereof being positioned in said concave recess.

A fluid heating device comprising:

• a transparent annular inner wall forming an internal space for receiving an infrared radiation heating member, said transparent annular inner wall having first and second open ends;
• an annular outer wall spaced outwardly from said transparent annular inner wall to form a fluid passageway therebetween;
• and
• a quartz glass tube type infrared radiation heating member removably positioned in said internal space so that said quartz glass tube type infrared radiation heating member can be removed from said fluid heating device without requiring that said fluid passageway be opened;
• said quartz glass tube type infrared radiation heating member, when positioned in said internal space, being spaced from said transparent annular inner wall to form a clearance between said quartz glass tube type infrared radiation heating member and said transparent annular inner wall such that said quartz glass tube type infrared radiation heating member is at least partially surrounded by said transparent annular inner wall while avoiding direct contact between said quartz glass tube type infrared radiation heating member and said transparent annular inner wall;
• and
• wherein said annular outer wall reflects infrared radiation, which has passed from said quartz glass tube type infrared radiation heating member through said internal space, said transparent annular inner wall, and said fluid passageway, back into said fluid passageway.

A fluid heating device comprising:

• a transparent annular inner wall forming an internal space for receiving an infrared radiation heating member;
• an annular outer wall spaced outwardly from said transparent annular inner wall to form a fluid passageway therebetween;
• and
• a quartz glass tube type infrared radiation heating member removably positioned in said internal space so that said quartz glass tube type infrared radiation heating member can be removed from said fluid heating device without requiring that said fluid passageway be opened;
• said quartz glass tube type infrared radiation heating member, when positioned in said internal space, being spaced from said transparent annular inner wall such that said quartz glass tube type infrared radiation heating member is at least partially surrounded by said transparent annular inner wall while avoiding direct contact between said quartz glass tube type infrared radiation heating member and said transparent annular inner wall;
• wherein said annular outer wall reflects infrared radiation, which has passed from said quartz glass tube type infrared radiation heating member through said internal space, said transparent annular inner wall, and said fluid passageway, back into said fluid passageway;
• wherein said transparent annular inner wall is formed in an approximately semispherical shape with a concave recess therein;
• and
• wherein said quartz glass tube type infrared radiation heating member is U-shaped with at least a portion thereof being positioned in said concave recess.

A fluid heating device comprising:

• a transparent annular inner wall forming an internal space for receiving an infrared radiation heating member;
• a quartz glass tube type infrared radiation heating member positioned in said internal space and spaced from said transparent annular inner wall such that said quartz glass tube type infrared radiation heating member is at least partially surrounded by said transparent annular inner wall;
• and
• an annular outer wall spaced outwardly from said transparent annular inner wall to form a fluid passageway therebetween, said annular outer wall absorbing infrared radiation, which has passed from said quartz glass tube type infrared radiation heating member through said internal space, said transparent annular inner wall, and said fluid passageway, and heating fluid in said fluid passageway by conduction;
• wherein said transparent annular inner wall is formed in an approximately semispherical shape with a concave recess therein, and wherein said infrared radiation heating member is U-shaped with at least a portion thereof being positioned in said concave recess.