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JingHan Heating Course -1 Heating temperature gradient
Heating temperature gradient: In the heating process of the building, there is a change rate of 0.3-1.5℃ increase of indoor temperature as the building rises each meter with the height. This heating temperature change, with the heating medium temperature rise, the indoor temperature rise rate will have a greater change, this phenomenon is called heating temperature gradient.
JingHan Heating Course -2 Chimney effect
Chimneyeffect:Referstotheindoorairalongtheverticalslopeofthespacetoriseorfall,resultinginenhancedconvectionairphenomenon.Itcausesanacceleratedflowofindoorair,whichspeedsuptheflowofhotgasupandoutofthebuilding.
JingHan Heating Course -3 The reason and results of "Heating temperature gradient"
Thephenomenonoftemperaturegradientiscausedbythefactthatindoorairmoleculeshavethermalenergyduringtheheatingprocessofradiator,therelativedensitydecreases,theunitvolumemassbecomeslighter,andthe"hotairupwardfloatingphenomenon"isgeneratedbythebuoyancyeffectofthesurroundingcoldair.Itcancauseaheatingprobleminaheatingroomwheretheceilingtemperatureishighandthefloortemperatureislow,andtheheatingisnotuptotherequirements. Aradiatorisadevicethatheatsairbynaturalconvection. Morethan60%oftheheatoftheradiatorisgeneratedbyairconvection,andthisconvectiveheatexchangeprocessisthemaincauseofthe"temperaturegradient”.Inaddition,about35%oftheheatistransferredoutwardbymeansofradiation,whichisacceptedbythesurroundingobjectsintheprocessofradiation.Thisenergyisusefulworkheating.Another3%islostthroughheatconduction,whichalsoheatsthesurroundingair,creatinganew"temperaturegradient"thatflowsupward. Theresultofheating"temperaturegradient" Asaresultofthe"temperaturegradient"phenomenon,thenew"chimneyeffect"willbeacceleratedfollowedby.Thegenerationofthechimneyeffectenhancestheindoorairconvectionspeed,leadingtothehotairwillbetransferredtotheoutdoorduetothebuilding"cracks",resultinginmoreenergywaste.Theindoorheatingtemperatureisbalancedandstable,whichwillreducetheindoorairconvectionandreducethechimneyeffectintheenvironmentwithouttemperaturegradient. Thatshowsthattheheatingtemperaturegradienthasanobviousinfluenceontheheatingeffectofbuildings.Thetemperatureoftheheatinggroundareaisnotuptothestandard,andatthesametime,theheatingenergyiswasted.
