Vehicular heat accumulating system

A vehicular heat accumulating system comprising a circulation circuit in which fluid circulates, wherein

• the circulation circuit includes a heat accumulating unit that accumulates heat from the fluid or dissipates heat to the fluid,
• the heat accumulating unit includes
• an upstream heat accumulator, the upstream heat accumulator accommodating a supercooling heat accumulating material, having a channel in which the fluid flows, configured to enable heat exchange between the fluid flowing in the channel and the supercooling heat accumulating material, disposed at an upstream side in a flow direction of the fluid,
• a downstream heat accumulator, the downstream heat accumulator accommodating a supercooling heat accumulating material, having a channel in which the fluid flows, configured to enable heat exchange between the fluid flowing in the channel and the supercooling heat accumulating material, disposed at a downstream side in the flow direction of the fluid, a serial connection pipe connecting the channel of the upstream heat accumulator and the channel of the downstream heat accumulator to each other in series,
• a bypass pipe configured to cause the fluid that has flowed in the channel of the upstream heat accumulator to bypass the channel of the downstream heat accumulator,
• a pipe switching section configured to perform switching between the serial connection pipe and the bypass pipe,
• a supercooling cancel device configured to cancel a supercooling state of the supercooling heat accumulating material, and
• a control device configured to control the pipe switching section and the supercooling cancel device,
• the control device causes the supercooling cancel device to cancel the supercooling state of the supercooling heat accumulating material so that a temperature rise mode in which a temperature of a warming target is increased, if the supercooling heat accumulating material is in the supercooling state and a temperature rise of the warming target is requested, and
• the control device controls the pipe switching section such that the channel of the upstream heat accumulator and the channel of the downstream heat accumulator are set in a serial connection state by the serial connection pipe in heat accumulation of the supercooling heat accumulating material, and the fluid that has passed through the upstream heat accumulator flows in the bypass pipe in the temperature rise mode.