Energy-saving central heating and hot water supply system

An energy-saving central heating and hot water supply system, the system comprising:

• a main heat exchanger configured to receive one of heat sources among hot water, medium temperature water, and steam from a heat production facility and produce heating water through a main heat exchange;
• a circulation pump configured to circulate the heating water produced in the main heat exchanger so that the heating water is supplied to and collected from each household or floor;
• a hot water supply heat exchanger located at each household or floor so as to produce hot water through a hot water supply heat exchange by utilizing the heating water supplied from the main heat exchanger,
• wherein the produced hot water is circulated in a floor coil through a hot water distributor located at the same household or floor or is directly circulated in the floor coil;
• an integrated hot water supply main pipe extended from the main heat exchanger so as to supply the produced hot water;
• an integrated hot water return main pipe extended from the main heat exchanger so as to return the used heating water to the main heat exchanger;
• a heating water supply pipe configured to connect the integrated hot water supply main pipe to a supply side of the hot water distributor;
• a heating water return pipe configured to connect the integrated hot water return main pipe to a collection side of the hot water distributor;
• a heating water supply pipe for hot water supply branched from the heating water supply pipe and connected to the hot water supply heat exchanger;
• a first valve installed in the heating water supply pipe so as to control a flow path of the heating water supply pipe;
• a second valve installed in the heating water supply pipe for hot water supply so as to control a flow path of the heating water supply pipe for hot water supply;
• a controller configured to control the first and second valves to supply the heating water supplied through the heating water supply pipe to the hot water distributor or the hot water supply heat exchanger depending on the present use of the hot water;
• a bypass pipe configured to return a portion of the heating water supplied from the hot water supply heat exchanger to the hot water distributor to the heating water return pipe by connecting the heating water supply pipe to the heating water return pipe;
• and
• a pipeline control unit configured to distribute the heating water discharged from the hot water supply heat exchanger to the hot water distributor and the bypass pipe at a predetermined ratio.