Waste heat recovery system

摘要

A waste heat recovery system includes a fuel cell, a coolant circulation flow passage, a first heat exchanger, a waste heat recovery flow passage, a second heat exchanger, an upstream end of the waste heat recovery flow passage, and a downstream end of the waste heat recovery flow passage. The coolant circulation flow passage includes a first coolant supply flow passage, a first coolant exhaust flow passage, and a first bypass flow passage. The upstream end is connected to at least one of an inlet coolant reservoir and the first coolant exhaust flow passage at a position downstream of a connection point between the first coolant exhaust flow passage and the first bypass flow passage. The downstream end is connected to at least one of the inlet coolant reservoir, an outlet coolant reservoir, and the first coolant supply flow passage.

主权项

1. A waste heat recovery system comprising:
a fuel cell including a reaction gas flow passage and a coolant flow passage, the fuel cell generating electricity if reaction gas is supplied to the reaction gas flow passage; a coolant circulation flow passage configured to allow a coolant flowing out of the coolant flow passage to return to the coolant flow passage and circulate through the coolant flow passage; a first heat exchanger disposed in the coolant circulation flow passage, the first heat exchanger causing the coolant to dissipate heat through heat exchange with air; a first coolant circulation unit disposed in the coolant circulation flow passage, the first coolant circulation unit causing the coolant to circulate; a first switching unit disposed in the coolant circulation flow passage, the first switching unit switching a flow direction of the coolant so that the coolant flows through the first heat exchanger if a temperature of the fuel cell is higher than or equal to a predetermined value; a waste heat recovery flow passage configured to branch the coolant circulating through the coolant circulation flow passage and recover waste heat of the fuel cell through heat exchange with air; a second heat exchanger disposed in the waste heat recovery flow passage, the second heat exchanger exchanging heat between air-conditioning air and the coolant; and a second coolant circulation unit disposed in the waste heat recovery flow passage, the second coolant circulation unit circulating the coolant, wherein the first heat exchanger includes an inlet coolant reservoir that reserves the coolant flowing out of the coolant flow passage, a heat dissipation unit configured to dissipate heat of the coolant flowing out of the inlet coolant reservoir through heat exchange with air, and an outlet coolant reservoir that reserves the coolant that has dissipated heat in the heat dissipation unit, wherein the coolant circulation flow passage includes a first coolant supply flow passage that is connected to the outlet coolant reservoir and an inlet port of the coolant flow passage and that allows the coolant to be supplied to the coolant flow passage to pass therethrough, a first coolant exhaust flow passage that is connected to an outlet port of the coolant flow passage and the inlet coolant reservoir and that allows the coolant exhausted from the coolant flow passage to pass therethrough, and a first bypass flow passage that is connected to the first coolant supply flow passage and the first coolant exhaust flow passage so as to bypass the first heat exchanger, wherein an upstream end of the waste heat recovery flow passage is connected to one of the first coolant exhaust flow passage at a position downstream of a connection point between the first coolant exhaust flow passage and the first bypass flow passage and the inlet coolant reservoir, and wherein a downstream end of the waste heat recovery flow passage is connected to one of the inlet coolant reservoir, the outlet coolant reservoir, and the first coolant supply flow passage.