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