Organic Rankine Cycle Waste Heat Recovery 2026
Organic Rankine Cycle Waste Heat Recovery 2026
ORC technology converts low-to-medium grade waste heat in the 30–350°C range into electrical or mechanical power. This dataset spans patent filings and research literature from 2010–2026 across industrial, marine, transport, and power generation sectors.
ORC Waste Heat Recovery: Architecture, Fluids, and Applications
The Organic Rankine Cycle substitutes water with a low-boiling-point organic working fluid, enabling efficient power extraction from heat sources below approximately 350°C — a range where conventional steam cycles are thermodynamically inefficient or impractical. Four core architectural configurations appear consistently in this dataset: basic ORC, recuperative ORC, dual-loop ORC, and cascade or multi-stage ORC systems.
Working fluid selection is a dominant technical dimension. Fluids documented across multiple studies in this dataset include R245fa, toluene, cyclohexane, benzene, cyclopentane, R1233zd(E), R1234yf, R1234ze, pentane, isopentane, and siloxanes. Fluid selection governs thermal efficiency, expander sizing, environmental compliance (GWP, ODP), and economic viability across different temperature ranges.
Conventional combustion systems convert only approximately 30–35% of fuel energy into useful work, leaving a large recoverable thermal fraction. ORC WHR systems have been documented delivering 301 kW output at 121°C heat source temperature using R245fa and a single-stage radial turbine, while two-stage ORC configurations achieve up to 20% higher thermal efficiency and 44% higher net power output versus single-stage designs.
Patent publication dates in this dataset span 2010–2026, revealing three phases: a foundational phase (2010–2014) establishing core architectures, a development phase (2015–2021) broadening across jurisdictions and sectors, and a maturation phase (2022–2026) dominated by hybrid and integrated architectures. In this dataset, PyroGenesis Canada Inc. leads with 7 filings, followed by General Electric with 4 filings in retrieved records.
Technology Cluster Distribution and Working Fluid Patterns
Patent and literature records in this dataset cluster into four primary technology groups and span multiple application sectors. Working fluid preferences shift across temperature ranges and are increasingly constrained by GWP and ODP regulatory requirements.
Patent Filings by Technology Cluster (Dataset Snapshot)
In this dataset, integrated and hybrid ORC systems and dual-loop architectures each account for significant filing activity, with simple/recuperative ORC forming the largest literature cluster.
↗ Click bars to exploreORC Patent Filing Activity by Phase (Dataset Snapshot, 2010–2026)
In this dataset, filing activity shows a clear three-phase trajectory: foundational patents 2010–2014, broadening activity 2015–2021, and hybrid/integrated architectures dominating the 2022–2026 phase.
↗ Click bars to exploreKey ORC WHR Deployment Sectors: Industry, Marine, Transport, and Energy
This dataset documents ORC waste heat recovery deployments across six primary sectors, each presenting distinct heat source characteristics, temperature ranges, and economic constraints. The heaviest coverage spans heavy industry, internal combustion engines, marine shipping, and oil and gas applications.
Heavy Industry: Cement, Steel, Ceramics
Steel sinter cooler studies estimate approximately 10% of 9,527 kW waste thermal potential is recoverable with a 2.4-year payback. An optimized subcritical ORC applied to a 100 MWe electric arc furnace highlights batch-process heat profile variation as the primary design challenge. CTN Makina’s 2024 WO patent specifically targets cement plant flue gas WHR, and a solar-hybrid ORC study from 2020 documents rotary kiln integration in a cement facility.
Industrial StationaryInternal Combustion Engines and Road Transport
ORC WHR for vehicles is documented with a 2–5 year payback and approximately 30% useful fuel energy conversion in ICEs. A hybrid vehicle study reports maximum ORC cycle efficiency of 5.4%, delivering 2.02 kW from engine WHR. Cummins Intellectual Properties filed dual-boiler ORC patents in 2011 and 2013, while General Electric’s 2016 EP patent covers turbocharger charge air cooling WHR via simple ORC.
Mobile TransportMarine Shipping and Offshore Vessels
ORC systems are estimated capable of reducing CO₂ emissions up to 20% on vessels, with annual fuel savings of 5–9% and specific installation costs of $5,000–8,000/kW documented for offshore service vessels. Shanghai Maritime University’s 2024 and 2025 US patents cover three-fluid heat exchanger and regenerator architectures utilizing LNG cold energy as the condenser sink and marine engine exhaust and jacket water as heat sources.
Marine ApplicationOil, Gas, Power, and Waste-to-Energy
Saudi Arabian Oil Company filed three progressive continuation patents (2017, 2018, 2021) covering ORC conversion of gas processing plant waste heat, using a heating fluid loop with an accumulation tank. PyroGenesis Canada Inc. holds 7 filings in this dataset directed to ORC integration in plasma gasification and incineration systems, active from 2012 to 2024. Volt Group Limited’s Australian patents (2020, 2021) cover 40–45 MW open cycle gas turbine exhaust ORC for extractive industry power stations.
Power GenerationLeading Assignees in ORC Waste Heat Recovery — Dataset Snapshot
In this dataset, 6 assignees are identifiable with 2 or more patent filings across 7 jurisdictions. PyroGenesis Canada Inc. accounts for 7 filings in retrieved records — all directed to plasma gasification and incineration ORC integration — while General Electric holds 4 filings spanning cascade systems, charge-air-cooling WHR, and nonpolar organic solvent architectures in retrieved records.
Top Assignees by Patent Filing Count in Retrieved Records (Dataset Snapshot)
↗ Click bars to explorePyroGenesis Canada Inc.
PyroGenesis Canada Inc. holds the highest filing count in this dataset with 7 patents spanning US (6), CA (1), and WO (1) jurisdictions, with active filing from 2012 to 2024. All filings are directed to ORC integration within plasma gasification and incineration waste-to-energy systems, using liquid quench loops from plasma and incineration thermal sections to feed the ORC evaporator. The sustained filing strategy — including continuation patents through 2024 — indicates active IP prosecution around this narrow application niche.
Canada — CAGeneral Electric Company
General Electric holds 4 filings in this dataset across US (2), EP (2), and GB (1) jurisdictions, spanning 2012 to 2016. Patents cover cascade ORC configurations using three-to-five ORC stages with toluene or cyclohexane (2013, GB), nonpolar organic solvent closed-loop ORC for gas turbine low-grade heat below approximately 500°C (2015, US), and turbocharger charge air cooling WHR via simple ORC (2016, EP). These filings establish foundational architectural claims across both cascade and simple ORC configurations.
United StatesNext-Generation ORC: LNG Cold Energy, Low-GWP Fluids, and Hybrid Architectures
The most recent filings (2024–2026) and literature from 2022–2023 in this dataset indicate five emerging directions: LNG cold energy as ORC heat sink, low-GWP next-generation working fluids, ambient air thermal harvesting, cement and heavy process industry WHR, and advanced thermoeconomic optimization using CAMD and genetic algorithms.
LNG Cold Energy as Marine ORC Condenser Sink
Shanghai Maritime University’s 2024 and 2025 US patents represent the most technically novel filings in this dataset, using LNG regasification cold energy (approximately −162°C to ambient) as the condenser heat sink to dramatically increase temperature differential. Three-fluid heat exchangers and regenerators are key enabling components, simultaneously exploiting marine engine exhaust, jacket cooling water, and LNG cold energy in a single integrated system. As global LNG-fueled shipping expands under IMO emissions regulations, this configuration is expected to attract intensified IP competition.
Low-GWP Next-Generation Working Fluids
Literature from 2022 consistently identifies R1233zd(E), R1234ze(Z), R1234ze(E), and R1234yf as replacements for legacy fluids including R245fa, R123, and R134a, driven by HFC phase-out under the Kigali Amendment. The 2022 exergy analysis documents that R1233zd(E) achieves competitive second-law efficiency within 1–5.66% of benchmark fluids while offering near-zero ODP and GWP below 1. ORC system designs optimized for these fluids’ distinct thermodynamic properties — including heat exchanger geometries and expander configurations — represent likely IP whitespace in current portfolios.
Simple ORC vs. Dual-Loop ORC: Key Technical and Economic Dimensions
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| Dimension | Simple / Recuperative ORC | Dual-Loop ORC (DORC) |
|---|---|---|
| Heat Source | Single source; 80–160°C typical for R245fa | Two concurrent sources: exhaust ~350–500°C (HT) and jacket water ~80–100°C (LT) |
| Typical Working Fluids | R245fa, R1233zd(E), R1234ze, R1234yf, isopentane | HT loop: toluene or cyclohexane; LT loop: R245fa, R1233zd, R1234yf |
| Thermal Efficiency Gain | Recuperative variant improves efficiency ~5% over basic ORC | Two-stage ORC achieves up to 20% higher thermal efficiency vs. single-stage |
| Net Power Output | 301 kW demonstrated at 121°C heat source (R245fa, radial turbine, 2019) | HT loop: 253.4 kW max (cyclohexane); additional LT loop output from jacket water and HT condensation heat (marine engine study, 2022) |
| System Complexity | Four core components: evaporator, turbine, condenser, pump; recuperator added for RORC | Two separate boiler circuits; dual turbines on common shaft or separate; supercritical HT + subcritical LT possible |
| Key Patent Assignees (Dataset) | General Electric (2015 US, 2016 EP), ABB Schweiz AG (2011 EP), Cummins (2011 US) | Cummins Intellectual Properties (2013 US), academic literature (2017, 2022) |
| Primary Application | Industrial WHR (80–160°C), geothermal binary, solar-thermal, vehicle WHR | Internal combustion engines (ICE), marine main engines, CNG engines |
| Economic Indicator | 2–5 year payback for vehicle applications; ~2.4-year payback for sinter cooler WHR | Marine installation: $5,000–8,000/kW; CO2 reduction up to 20% on vessels |
Frequently Asked Questions: ORC Waste Heat Recovery Technology
ORC technology is designed to convert low-to-medium grade waste heat in the range of approximately 30–350°C into electrical or mechanical power. This range covers heat sources where conventional steam Rankine cycles are thermodynamically inefficient or impractical. Geothermal binary ORC is applicable from below 90°C to 150°C, while ICE exhaust ORC targets 350–500°C and jacket water circuits target 80–100°C.
Fluids appearing across multiple studies in this dataset include R245fa, toluene, cyclohexane, benzene, cyclopentane, R1233zd(E), R1234yf, R1234ze, pentane, isopentane, and siloxanes. R245fa is among the most common at heat source temperatures of 80–160°C. For dual-loop systems, high-temperature loops typically use toluene or cyclohexane, while low-temperature loops use R245fa, R1233zd, or R1234yf.
Literature evidence in this dataset shows recuperative ORC improves thermal efficiency by approximately 5% over basic configurations. Two-stage ORC cycles achieve up to 20% higher thermal efficiency and 44% higher net power output versus single-stage configurations, according to a 2023 comprehensive ORC review.
PyroGenesis Canada Inc. holds the highest filing count in this dataset with 7 patents across US (6), CA (1), and WO (1) jurisdictions, spanning 2012 to 2024. All filings are directed to ORC integration within plasma gasification and incineration waste-to-energy systems.
Marine ORC WHR is driven by IMO emissions regulations including EEDI and CII. ORC systems are estimated capable of reducing CO2 emissions up to 20% on vessels, with annual fuel savings of 5–9% and specific installation costs of $5,000–8,000/kW for offshore service vessels. Shanghai Maritime University filed two US patents in 2024 and 2025 covering ORC systems that use LNG cold energy as the condenser heat sink alongside marine engine exhaust and jacket water as heat sources.
Regulatory phase-out of HFCs under the Kigali Amendment is the primary driver. Fluids such as R1233zd(E), R1234ze(Z), R1234ze(E), and R1234yf are documented as replacements for legacy fluids including R245fa and R123. A 2022 exergy analysis in this dataset documents that R1233zd(E) achieves competitive second-law efficiency within 1–5.66% of benchmark fluids while offering near-zero ODP and GWP below 1.
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.