US 11,988,115 B2
System for recovering waste heat and method thereof
Ernesto Nasini, Florence (IT); Marco Santini, Florence (IT); Francesco Bellantone, Florence (IT); and Francesco Chiesi, Florence (IT)
Assigned to Nuovo Pignone Tecnologie S.R.L., Florence (IT)
Appl. No. 17/253,402
Filed by NUOVO PIGNONE TECNOLOGIE S.R.L., Florence (IT)
PCT Filed Jun. 10, 2019, PCT No. PCT/EP2019/025175
§ 371(c)(1), (2) Date Dec. 17, 2020,
PCT Pub. No. WO2019/238268, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 102018000006187 (IT), filed on Jun. 11, 2018.
Prior Publication US 2021/0363900 A1, Nov. 25, 2021
Int. Cl. F01K 25/10 (2006.01); F01K 7/36 (2006.01); F02C 1/10 (2006.01)
CPC F01K 25/103 (2013.01) [F01K 7/36 (2013.01); F02C 1/105 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A waste heat recovery system, comprising:
a Brayton cycle system comprising:
a waste heat source configured to produce a hot fluid, wherein a fuel source is not combusted to generate the hot fluid;
a heater in fluid communication with the waste heat source, the heater configured to circulate carbon dioxide vapor in heat exchange relationship with the hot fluid produced by the waste heat source to heat the carbon dioxide vapor;
an expander coupled to the heater and configured to expand the carbon dioxide vapor;
a first heat exchanger coupled to the expander;
a cooler coupled to the first heat exchanger, the cooler comprising a second heat exchanger and a third heat exchanger, wherein the first heat exchanger delivers carbon dioxide vapor to the third heat exchanger of the cooler, which cools the carbon dioxide vapor to a first temperature;
a compressor having a first stage and a second stage coupled to the second heat exchanger, the first stage being configured to compress the carbon dioxide vapor,
wherein the second heat exchanger receives the compressed carbon dioxide from the first stage of the compressor and delivers the compressed carbon dioxide to the second stage of the compressor at a second temperature that is lower than the first temperature,
wherein the first heat exchanger is configured to circulate the carbon dioxide vapor from the expander to the third heat exchanger in heat exchange relationship with the carbon dioxide vapor from the compressor to the heater, and
wherein the expander and the compressor are mechanically coupled volumetric machines.