▁p ump , ▁a ▁ch iller ▁or ▁he ater ▁with ▁constant ▁power ▁rate , ▁and ▁continuous ▁logging ▁of ▁the ▁in let ▁and ▁out let ▁temper atures ▁of ▁the ▁flow . ▁The ▁equipment ▁is ▁normally ▁contained ▁within ▁a ▁single ▁unit ▁for ▁ease ▁of ▁transport ▁and ▁efficient ▁use . ▁The ▁thermal ▁response ▁data ▁( i . e . ▁temperature ▁development ▁in ▁the ▁bore hole ▁at ▁a ▁certain ▁energy ▁injection / ext raction ) ▁allows ▁estimation ▁of ▁the ▁effective ▁thermal ▁conduct ivity ▁of ▁the ▁ground ▁and ▁the ▁thermal ▁resistance ▁of ▁the ▁bore hole . ▁ ▁Re comm end ations ▁In ▁order ▁to ▁ful fil ▁the ▁TR T ▁properly , ▁the ▁following ▁recommend ations ▁should ▁be ▁considered ▁( Ge h lin , ▁ 2 0 0 2 , ▁S anner ▁et ▁al ., ▁ 2 0 0 5 ▁and ▁Kh arse h ▁ ): ▁ ▁Use ▁a ▁power ▁load ▁as ▁steady ▁as ▁possible , ▁ ▁Mon itor ▁the ▁development ▁of ▁the ▁in let ▁and ▁out let ▁temperature ▁of ▁the ▁bore hole , ▁ ▁The ▁duration ▁of ▁the ▁test ▁is ▁a ▁minimum ▁of ▁ 5 0 ▁hours . ▁ ▁Trad itional ▁response ▁tests ▁apply ▁a ▁constant ▁heat ▁flux ▁to ▁the ▁p ump ed ▁water , ▁however ▁the ▁newer ▁" constant ▁temperature " ▁method , ▁which ▁holds ▁the ▁out flow ▁water ▁at ▁a ▁constant ▁temperature , ▁has ▁been ▁shown ▁to ▁have ▁many ▁advantages , ▁including ▁short ening ▁the ▁test ▁period ▁and ▁in ▁impro ving ▁the ▁operating ▁stability ▁and ▁test ▁accuracy . ▁ ▁Pre par ation ▁Before ▁the ▁test ▁is