The method 1 wherein the heat transfer fluid is circulated without pressurizing the space between the absorber plate and the cover, thereby increasing {HEAD ~ the heat rejection characteristics} of {TAIL ~ the collector} 
The method 1 wherein the heat transfer fluid is circulated without pressurizing the space between the absorber plate and the cover , thereby increasing { HEAD ~ the heat rejection characteristics } of { TAIL ~ the collector }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL