# US 11,909,078 B2 · Systems and methods to utilize water output of fuel cell systems for evaporative cooling of radiators

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,909,078 B2
- Document ID: US11909078B2
- Status: Granted
- Kind: B2
- Application number: 17/591,532
- Filed: 2022-02-02
- Published: 2022-09-15
- Granted: 2024-02-20
- Earliest claimed: 2021-03-15
- Assignees: Cummins Inc.
- Applicants: Cummins Inc.
- Inventors: Archit Koti; Rohit Saha; Sumit Tripathi; Christopher Nelson; Agneya Turlapati; Jairo A. Martinez Garcia; Sachin Vinayak Damle; Suhas Deutkar; Pradheepram Ottikkutti; Sunil Suryakant Bahulikar; Sandesh Sadawarte
- Web page: https://patentgrep.com/patent/US11909078B2

## CPC

- H01M 8/04029: Heat exchange using liquids
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 8/04059: {Evaporative processes for the cooling of a fuel cell}
- H01M 8/04067: {Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins}
- H01M 8/0432: Temperature; Ambient temperature
- H01M 2250/20: Fuel cells in motive systems, e.g. vehicle, ship, plane
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure generally relates to systems and methods of using water output from a fuel cell system to aid in heat dissipation and evaporative cooling of radiators.

## Claims

### Claim 1

A method of dissipating heat in a system comprising:
passing a coolant used in a fuel cell system through a radiator,
dissipating heat produced by the fuel cell system by using water output from the fuel cell system,
evaporating the water output from the fuel cell system,
operating at least one fan arranged adjacent the radiator to direct air flow toward the radiator,
cooling the radiator by the evaporated water output from the fuel cell system to produce an evaporative cooling effect, and
using a controller that comprises a look ahead power estimator, a fuel cell liquid water estimator, and an evaporative cooling benefit to determine when to create the evaporative cooling effect.

### Claim 2 (depends on 1)

The method of dissipating heat in a system of claim 1, wherein the evaporative cooling effect is a direct evaporative cooling effect, a passive direct evaporative cooling effect, or an indirect evaporative cooling effect.

### Claim 3 (depends on 1)

The method of dissipating heat in a system of claim 1, wherein the evaporative cooling effect is a direct evaporative cooling effect, and wherein the direct evaporative cooling effect comprises a wetted membrane, a mister, or a nozzle.

### Claim 4 (depends on 1)

The method of dissipating heat in a system of claim 1, further comprising collecting the water output produced by the fuel cell system in a sump or a stored water tank before using the water output to create the evaporative cooling effect on the radiator.

### Claim 5 (depends on 4)

The method of dissipating heat in a system of claim 4, further comprising passing the water output collected in the sump or the stored water tank through a pump or an evaporative cooling pad before using the water output to create the evaporative cooling effect on the radiator.

### Claim 6 (depends on 4)

The method of dissipating heat in a system of claim 4, further comprising passing the water output collected in the sump or the stored water tank through a heat exchanger and passing the coolant through the heat exchanger before the coolant is passed through the radiator.

### Claim 7 (depends on 1)

The method of dissipating heat in a system of claim 1, wherein the method further comprises using the controller to determine in real time when to create the evaporative cooling effect.

### Claim 8 (depends on 1)

The method of dissipating heat in a system of claim 1, wherein the controller communicates with sensors providing information including coolant temperature, radiator fan speed, fuel cell power, fuel cell coolant temperature target, sump water level, sump pump speed, and vehicle speed.

### Claim 9 (depends on 1)

The method of dissipating heat in a system of claim 1, wherein the fuel cell liquid water estimator receives input or communication from the look ahead power estimator.

### Claim 10

A heat dissipating system comprising:
a fuel cell system;
a coolant;
water output from the fuel cell system;
a radiator; and
a wetted membrane located adjacent the radiator;
wherein the water output from the fuel cell system is used to dissipate heat by evaporative cooling of the radiator through which the coolant is passed.

### Claim 11 (depends on 10)

The heat dissipating system of claim 10, wherein the water output from the fuel cell system is passed through a heat exchanger and the wetted membrane.

### Claim 12 (depends on 11)

The heat dissipating system of claim 11, wherein the water output from the fuel cell system is channeled through a nozzle, a mister, or a gap next to the radiator.

### Claim 13 (depends on 10)

The heat dissipating system of claim 10, wherein the radiator is arranged in a first plane and the fuel cell system is arranged in a second plane, and the first plane is lower than the second plane so that gravity directs the water output to the radiator.

### Claim 14 (depends on 10)

The heat dissipating system of claim 10, wherein the water output is collected in a sump and passed through a pump before being passed through the radiator.

### Claim 15 (depends on 10)

The heat dissipating system of claim 10, further comprising a heat exchanger, wherein the water output from the fuel cell system is passed through the heat exchanger and the coolant is passed through the heat exchanger before being passed through the radiator.

### Claim 16 (depends on 10)

The heat dissipating system of claim 10, further comprising at least one radiator fan arranged adjacent the wetted membrane to locate the wetted membrane between the at least one radiator fan and the radiator.

### Claim 17 (depends on 10)

The heat dissipating system of claim 10, further comprising a heat exchanger, wherein the water output from the fuel cell system is passed through the heat exchanger before being passed through the radiator and the coolant is passed through the heat exchanger before being passed through the radiator.

### Claim 18 (depends on 10)

The heat dissipating system of claim 10, further comprising a heat exchanger, wherein the water output from the fuel cell system directly passes through the radiator, and the coolant is passed through the heat exchanger before being passed through the radiator.

### Claim 19 (depends on 10)

The heat dissipating system of claim 10, further comprising a system controller or a thermal management controller for determining in real time when to create an evaporative cooling effect using information including coolant temperature, radiator fan speed, fuel cell power, fuel cell coolant temperature target, sump water level, sump pump speed, and vehicle speed.