# US 11,299,660 B2 · Three-component mixed working fluid for internal combustion engine waste heat recovery power cycle

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- Number: US 11,299,660 B2
- Document ID: US11299660B2
- Status: Granted
- Kind: B2
- Application number: 17/044,800
- Filed: 2019-03-04
- Published: 2021-10-14
- Granted: 2022-04-12
- Earliest claimed: 2018-12-30
- Assignees: Tianjin University
- Applicants: Tianjin University
- Inventors: Gequn Shu; Peng Liu; Hua Tian; Zhigang Yu
- Web page: https://patentgrep.com/patent/US11299660B2

## CPC

- C09K 5/045: {containing only fluorine as halogen}
- C09K 5/10: Liquid materials
- Y02P 20/10: Process efficiency
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention discloses a three-component mixed working fluid for an ICE waste heat recovery power cycle, wherein the three-component mixed working fluid consists of carbon dioxide, pentane and a refrigerant, the refrigerant is a high-performance environment-friendly refrigerant with GWP value which is lower than 1000 and ODP value which is 0, and the refrigerant is one selected from a group consisting of difluoromethane, fluoroethane and 1,1-difluoroethane; according to the selected refrigerants, the mass percentage of each component is as follow: the mass percentage of CO2, pentane and difluoromethane are 30-70, 10-20, and 10-60; the mass percentage of CO2, pentane and fluoroethane are 30-70/10-20/10-50; the mass percentage of CO2, pentane and 1,1-difluoroethane are 10-70/10-30/10-60. The present invention has good environmental performance, safety performance and thermodynamic performance, and the thermal efficiency is higher than 12% of prior art; and the present invention further has good ability of synergistically recovering waste heat of engine coolant and gas, thus reaching 100% utilization rate of engine coolant, and more than 60% utilization rate of gas. The critical temperature of the three-component mixture is obviously higher than that of CO2, the cooling conditions of the system are relaxed, and the conditions for the waste heat recovery system for vehicles are satisfied.

## Claims

### Claim 1

A three-component mixed working fluid for an internal combustion engine waste heat recovery power cycle, wherein the three-component mixed working fluid for the internal combustion engine waste heat recovery power cycle consists of carbon dioxide, pentane and a refrigerant, the refrigerant is a high-performance environment-friendly refrigerant with GWP value which is lower than 1000 and ODP value which is 0, and the refrigerant is one selected from a group consisting of difluoromethane, fluoroethane and 1,1-difluoroethane; according to the selected refrigerants, the mass percentage of each component is as follow:
when the refrigerant is difluoromethane, comprising 10-20% by weight of pentane, 10-60% by weight of difluoromethane, and the rest is carbon dioxide;
when the refrigerant is fluoroethane, comprising 10-20% by weight of pentane, 10-50% by weight of fluoroethane, and the rest is carbon dioxide;
when the refrigerant is 1,1-difluoroethane, comprising 10-30% by weight of pentane, comprising 10-60% by weight of 1,1-difluoroethane, and the rest is carbon dioxide.