Keywords: 3-ton Slinky Loop.jpg A horizontal closed loop field for a heat pump heat exchanger A 3-ton slinky loop prior to being covered with soil The three slinky loops are running out horizontally with three straight lines returning the end of the slinky coil to the heat pump own 2006-11-15 Mark Johnson Marktj wikipedia en Marktj original upload log page en wikipedia 3-ton_Slinky_Loop jpg 2006-11-15 01 44 Marktj 448×277× 62925 bytes <nowiki>Mark Johnson Slinky Job</nowiki> 2006-11-15 01 34 Marktj 2048×1536× 1212704 bytes <nowiki>Mark Johnson Slinky Job </nowiki> Building engineering Geotechnical engineering Heat pumps Geothermal heat exchangers |