The control unit may also control a flow rate of the first fluid, such that {HEAD ~ the first fluid flow rate} is higher in {TAIL ~ the heating mode} than in the cooling mode 
The control unit may also control a flow rate of the first fluid , such that { HEAD ~ the first fluid flow rate } is higher in { TAIL ~ the heating mode } than in the cooling mode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH