Radiation heat exchange device with sub-near field gap

Abstract

A radiation heat exchange device serving as a modular unit includes a first metal radiant plate, and a second metal radiant plate spaced apart from the first metal radiant plate to define a sub-near field gap between the first metal radiant plate and the second metal radiant. The first metal radiant plate is heat-exchanged with the second metal radiant plate through the gap to regulate a temperature of the first metal radiant plate for regulating a temperature of an environment to be temperature-regulated.

What is claimed is: 
     
         1 . A radiation heat exchange device for a heat exchanging system, comprising:
 a first metal radiant plate defining a first radiation heat exchange zone, and having a first plate surface for communicating with an environment to be temperature-regulated, and an opposed plate surface; and   a second metal radiant plate having a first plate surface facing toward said second plate surface of said first metal radiant plate and an opposed second plate surface facing away of said first metal radiant plate, wherein said second metal radiant plate is spaced apart from said first metal radiant plate to define a sub-near field gap between said second plate surface of said first metal radiant plate and said first plate surface of said second metal radiant and within said first radiation heat exchange zone of said first metal radiant plate, such that said first metal radiant plate is heat-exchanged with said second metal radiant plate through said sub-near field gap to regulate a temperature of said first plate surface of said first metal radiant plate for regulating a temperature of the environment to be temperature-regulated.   
     
     
         2 . The radiation heat exchange device, as recited in  claim 1 , wherein a minimum width of said sub-near field gap, which is a minimum distance between said first metal radiant plate and said second metal radiant, is 2 mm. 
     
     
         3 . The radiation heat exchange device, as recited in  claim 1 , wherein a minimum width of said sub-near field gap, which is a minimum distance between said first metal radiant plate and said second metal radiant, is set between 1 mm and 3 mm. 
     
     
         4 . The radiation heat exchange device, as recited in  claim 1 , further comprising an isolation element mounted on said second plate surface of said first metal radiant plate at said first radiation heat exchange zone of said first metal radiant plate, wherein said sub-near field gap is formed by a thickness of said isolation element. 
     
     
         5 . The radiation heat exchange device, as recited in  claim 4 , wherein said isolation element is made of low thermal conductive material and has a mesh structure for providing spaces to heat exchange between said first metal radiant plate and said second metal radiant plate. 
     
     
         6 . The radiation heat exchange device, as recited in  claim 4 , wherein said isolation element is an isolation net defining said mesh structure thereat. 
     
     
         7 . The radiation heat exchange device, as recited in  claim 1 , further comprising a heat exchanging channel for guiding a heat exchange medium being flow therealong, wherein said second metal radiant plate is thermally contacted with said heat exchanging channel to form a heat exchange core plate assembly being heat exchanged with said first metal radiant plate through said sub-near field gap when the heat exchange medium flows along said heat exchanging channel. 
     
     
         8 . The radiation heat exchange device, as recited in  claim 5 , further comprising a heat exchanging channel for guiding a heat exchange medium being flow therealong, wherein said second metal radiant plate is thermally contacted with said heat exchanging channel to form a heat exchange core plate assembly being heat exchanged with said first metal radiant plate through said sub-near field gap when the heat exchange medium flows along said heat exchanging channel. 
     
     
         9 . The radiation heat exchange device, as recited in  claim 8 , wherein said second metal radiant plate has a first indentation groove formed thereon, wherein said heat exchanging channel is disposed at said first indentation groove to closely contact and thermally conduct said heat exchanging channel with said first indentation groove, wherein said first indentation groove is indented on said second metal radiant plate to tangentially contact with said isolation element so as to thermally conduct the second metal radiant plate with said first metal radiant plate through said mesh structure of said isolation element. 
     
     
         10 . The radiation heat exchange device, as recited in  claim 9 , further comprising at least one coil bracket having a second indention groove, wherein said coil bracket is coupled on said second plate surface of said second metal radiant plate at a position that said second indention groove is aligned with and extended along with said first indention groove to form an accommodating channel to receive and retain said heat exchanging channel. 
     
     
         11 . The radiation heat exchange device, as recited in  claim 10 , wherein said coil bracket is an elongated arc-shaped strip made of high thermal conductive material, such that said coil bracket not only retains said heat exchanging channel on said second metal radiant plate but also thermal conducts with both said heat exchanging channel and said second metal radiant plate. 
     
     
         12 . The radiation heat exchange device, as recited in  claim 11 , wherein said heat exchanging channel is configured as a heat exchanging coil having a plurality of straight pipe portions parallel with each other and a plurality U-shaped curved pipe portions, wherein two ends of each of said curved pipe portions are communicatively connected to two ends of two of said straight pipe portions respectively, wherein said coil bracket is coupled on each of said straight pipe portions of said heat exchanging channel respectively. 
     
     
         13 . The radiation heat exchange device, as recited in  claim 12 , wherein said straight pipe portions of said heat exchanging channel are thermally contacted with said second metal radiant plate and are disposed at said first indention grooves of said second metal radiant plate respectively, wherein said curved pipe portions of said heat exchanging channel are extended out of two opposed edges of said second metal radiant plate. 
     
     
         14 . The radiation heat exchange device, as recited in  claim 8 , further comprising a first radiation enhancing coating coated on said second plate surface of said first metal radiant plate at a position that said heat radiation enhancing coating said is sandwiched between said second plate surface of said first metal radiant plate and said isolation element. 
     
     
         15 . The radiation heat exchange device, as recited in  claim 14 , further comprising a second radiation enhancing coating coated on said first plate surface of said second metal radiant plate. 
     
     
         16 . The radiation heat exchange device, as recited in  claim 8 , further comprising a thermal insulation element on said second plate surface of said first metal radiant plate, wherein said second metal radiant plate and said first radiation heat exchange zone of said first metal radiant plate are enclosed by said thermal insulation element. 
     
     
         17 . The radiation heat exchange device, as recited in  claim 16 , further comprising an outer casing, having an outer reflective surface, mounted on said second plate surface of said first metal radiant plate to enclose said thermal insulation element, wherein said outer casing is configured for protecting said thermal insulation element from being damaged by an external force and for reflecting an external thermal radiation energy by said outer reflective surface of said outer casing. 
     
     
         18 . The radiation heat exchange device, as recited in  claim 17 , wherein said outer casing has two through slots formed thereat for two opening ends of said heat exchanging channel being extended out of said outer casing through the through slots respectively, wherein said outer casing further comprises two sealing rings mounted at said through slots and sleeved on said heat exchanging channel where said heat exchanging channel is extended out of said outer casing. 
     
     
         19 . The radiation heat exchange device, as recited in  claim 1 , wherein said first radiant metal plate and said second radiant metal plate are parallel with each other. 
     
     
         20 . The radiation heat exchange device, as recited in  claim 1 , wherein said first radiant metal plate and said second radiant metal plate are two aluminum plates. 
     
     
         21 . A radiation heat-exchanging ceiling plate arranged to install on a false ceiling for an air conditioning system, comprising:
 a metal ceiling plate having a bottom side and a peripheral side defining a receiving cavity and an opening;   a heat-exchanging coil mounted onto said bottom side of said metal ceiling plate inside said receiving cavity by a plurality of coil brackets and has two ends extending outward at said peripheral side of said metal ceiling plate, wherein said heat-exchanging coil is directly supported by said metal ceiling plate and not directly contacting said metal ceiling plate to prevent direct heat conduction between said heat-exchanging coil and said metal ceiling plate, said coil brackets has a heat transfer coefficient around 0.2-0.3 W/(mK) serving as insulating spacer to prevent substantive heat conduction between said coil brackets and said heat-exchanging coil, said heat-exchanging coil is maintained at a preset distance from said metal ceiling plate and a gap is formed between said heat-exchanging coil and said metal ceiling plate to allow effective radiation between said heat-exchanging coil and said metal ceiling plate;   a layer of thermal insulation material on a top of said heat-exchanging coil serving as a thermal barrier;   a layer of metal foil placed between said heat-exchanging coil and said layer of thermal insulation material for promoting heat transfer by radiation, and   a sealing layer being installed on a top of said layer of thermal insulation material to seal said opening of said metal ceiling plate and blocking air movement between said heat-exchanging coil and outside, wherein said heat-exchanging coil is sealed inside said receiving cavity through said sealing layer and said metal ceiling plate against water moisture,   thereby hot and cold spots caused by heat conduction between said heat-exchanging coil and other parts of said radiation heat-exchanging ceiling plate are effectively eliminated,   thereby dewing can be avoid as uneven hot and cold spots are eliminated while water moisture is blocked from reaching said heat-exchanging coil.   
     
     
         22 . The radiation heat-exchanging ceiling plate according to  claim 21 , comprising: a plurality of sealing strips sealing between edges of said sealing layer and edges of said metal ceiling plate to shield said heat-exchanging coil against water moisture, wherein said metal ceiling plate, said coil brackets, said heat-exchanging coil, said layer of metal foil, said layer of thermal insulation material, said sealing layer and said sealing strip form a one-piece modular structure with said two ends of said heat-exchanging coil extending outside said one-piece modular structure.