The invention relates to an urban large thermal capacity water circulating
system utilizing a
renewable energy source, belonging to the technical field of region energy comprehensive utilization. The invention aims at enabling cold and heat in a region to naturally balance and reducing mechanical conversion heat to be the minimum so as to directly supply the cold, the heat and domestic water for region buildings, fully utilize the
renewable energy source and improve the
energy supply efficiency and
energy consumption safety. The urban large thermal capacity water circulating
system comprises a water feeding and discharging subsystem including a primary
water treatment function, a large-thermal-capacity water circulating
pipe net subsystem, a user side subsystem including a middle-high
water treatment function, and an auxiliary
thermal source subsystem. The invention provides a direct
heat supply and cold
supply energy source conversion and utilization manner, realizes an idea of supplying water with different qualities for a user side, provides a user with domestic hot water, middle water and direct drinking water, and realizes functions of an urban
heat supply pipe net, an urban cold supply
pipe net and an
urban water supply pipe net through a set of pipe net; therefore, a conventional
energy source is saved, an urban municipal pipe net
system is simplified, the pipe net construction cost and the operation management cost are reduced, and the system can be applied to
urban region energy source comprehensive utilization and combined
energy supply optimal design.