Control approach 2 Controllers 2 Cooling 2 Cooling fluids 2 Cost analysis 2 Cost benefit analysis 2 Cost reduction 2 Energy systems 2 Flow rate 2 Heat pump systems 2 Heat pumps 2 Operating cost analyse 2 Operating costs 2 PVT 2 Photovoltaic thermals 2 Photovoltaic/thermal systems 2 Pumps 2 Reinforcement learning 2 Reinforcement learning approach 2 Solar assisted heat pump 2 control approaches operating cost analysis 2 reinforcement learning 2 solar-assisted heat pump 2