Izilawuli zobushushu kunye neevalvu zokulawula ubushushu (ngamanye amaxesha zibizwa ngokuba yi-TCV) zenzelwe ukulawula ubushushu benkqubo ngokulawula uxinzelelo lwe-thermal fluid okanye ukuhamba kwiicompressors, iibhatyi zetanki, iikhoyili zokufudumeza, okanye ezinye izinto zokufudumeza.