Simultaneous heating and cooling system with thermal storage tanks considering energy efficiency and operation method of the system

lThe simultaneous heating and cooling systems proposed focused on not only the plant side but also terminal equipment.lIt was found that the possibility of integrating the heat pump for other heat sources and sinks when using the radiant heating and cooling system as terminal equipment.lSeveral modes were deduced to use of heat pump for various heat source and sinks, and a simple operation method for determining the mode was proposed.lThe balancing mode was at maximum operating and the use of geothermal resources with one heat pump was possible when the proposed system and operation method were used. This study is aimed to propose a Simultaneous Heating and Cooling System with Thermal Storage Tanks which performs based on the balanced heat recovery considering energy efficiency and to suggest the operation method of proposed system. To achieve these aims, the essential equipment to the system containing terminal system was determined and a method for applying a variety of heat sources and sinks with one plant was suggested. The operation strategy is suggested for a heat pump to select the heat source or sink while considering zone temperature stability and to maximize the usage of the simultaneous heating and cooling system as much as possible. To achieve this aim, reference points for control were set in order to prevent a lack of available energy, and the priority was given to balancing modes which is only performed by proposed simultaneous heating and cooling system. The simulation results show that all supply temperatures can satisfy the design temperature; therefore, the zone temperatures are controlled well with a small amount of energy input for the auxiliary system.