Short answer

Incorporate waste heat recovery systems, like ORCs, into the design of energy-intensive processes to maximize efficiency, especially when external energy costs are high.

Field: Resource Management
Source: Applied Energy (2023)
Method: Techno-economic analysis and simulation
Evidence: Strong effect

Integrating waste heat recovery systems with an Organic Rankine Cycle (ORC) can significantly enhance the overall efficiency of large-scale green hydrogen production, turning a byproduct into a valuable energy source. This resource management research insight is drawn from a 2023 study published in Applied Energy. Using Techno-economic analysis and simulation, researchers explored how this design variable affects real-world outcomes. The key design takeaway: Incorporate waste heat recovery systems, like ORCs, into the design of energy-intensive processes to maximize efficiency, especially when external energy costs are high.

Study

Resource ManagementRecentStrong effect

Waste Heat Recovery in Green Hydrogen Production Boosts Efficiency by 36%

Applied Energy · 2023

Key Findings

01Waste heat recovery coupled with an ORC can increase the first-law efficiency of an electrolyzer from 71.4% to 98%.
02The ORC can generate sufficient power to drive hydrogen compression from 30 bar to 200 bar.
03The economic viability of the integrated system is highly dependent on electricity prices; it is more attractive when grid electricity prices are high.
04Additional capital and operating expenditures for the ORC can outweigh electricity savings at low electricity prices.

Application

Design takeaway

Incorporate waste heat recovery systems, like ORCs, into the design of energy-intensive processes to maximize efficiency, especially when external energy costs are high.

How to apply

When designing or optimizing industrial processes that generate significant waste heat, model the integration of an ORC to assess potential efficiency gains and cost savings, particularly in regions with high electricity tariffs.

Project actions

01When analyzing energy systems, always look for opportunities to recover waste heat.
02Consider the full lifecycle costs, including initial investment and ongoing operational expenses, when evaluating efficiency improvements.

Method & Evidence

AimWhat is the techno-economic feasibility of integrating waste heat recovery with an Organic Rankine Cycle for large-scale green hydrogen production?

MethodTechno-economic analysis and simulation

ProcedureA 10 MW proton exchange membrane electrolysis process was modeled, incorporating a waste heat recovery system coupled with an Organic Rankine Cycle (ORC). The system was analyzed for its technical efficiency improvements and economic viability, including the calculation of the levelised cost of hydrogen (LCOH).

ContextGreen hydrogen production facilities

Variables

IVImplementation of waste heat recovery with ORC

DVFirst-law efficiency of electrolyzer, Levelised cost of hydrogen (LCOH)

CVElectrolyzer size (10 MW), Electrolyzer type (PEM), Hydrogen outlet pressure (30 bar)

Strengths & Limitations

Strengths

+Provides a detailed techno-economic model for a specific industrial process.
+Quantifies significant efficiency improvements achievable through waste heat recovery.

Limitations

The cost-effectiveness of waste heat recovery is highly dependent on the specific application, the temperature of the waste heat, and local energy prices.

Reliability & validity

The study's validity relies on the accuracy of the simulation models used for the electrolysis process and the ORC. Reliability would be enhanced by sensitivity analyses across a wider range of operating conditions and component efficiencies.

Think critically

Under what conditions would the added complexity and cost of an ORC system for waste heat recovery *not* be justifiable, even with significant efficiency gains?

Design Principles

"Maximize system efficiency by recovering and repurposing waste energy streams."

This approach addresses critical energy waste in industrial processes, aligning with sustainability goals. By recovering and repurposing heat, designers can reduce reliance on external energy inputs for auxiliary functions like compression, leading to more resource-efficient and potentially cost-effective systems.

What This Means for Your Design

You can make processes that produce hydrogen much more efficient by capturing the heat they waste and using it to power other parts of the process, like compressing the hydrogen. This saves energy and can save money, but only if the electricity you'd otherwise buy is expensive.

How to use in your project

1.Use the concept of waste heat recovery and ORC integration to justify design choices aimed at improving energy efficiency in your design project.
2.Refer to the efficiency gains (e.g., 71.4% to 98%) as evidence for the impact of your design decisions.

Add to My Project

Quick Cite

Paragraph starter

This design project explores the integration of waste heat recovery systems, inspired by research such as the techno-economic analysis of green hydrogen production. By incorporating principles of resource management, specifically waste heat repurposing via technologies like Organic Rankine Cycles, significant improvements in overall system efficiency can be achieved, reducing reliance on external energy inputs and contributing to more sustainable design practices.

Source

Applied Energy

Techno-economic analysis of large-scale green hydrogen production and storage

journal · 2023

View source

Questions About This Research

What does the research say about waste heat recovery in green hydrogen production boosts efficiency by 36%?: Incorporate waste heat recovery systems, like ORCs, into the design of energy-intensive processes to maximize efficiency, especially when external energy costs are high. Evidence: Applied Energy (2023).
Why does "Waste Heat Recovery in Green Hydrogen Production Boosts Efficiency by 36%" matter for design?: This approach addresses critical energy waste in industrial processes, aligning with sustainability goals. By recovering and repurposing heat, designers can reduce reliance on external energy inputs for auxiliary functions like compression, leading to more resource-efficient and potentially cost-effective systems.
How can designers apply this research?: Incorporate waste heat recovery systems, like ORCs, into the design of energy-intensive processes to maximize efficiency, especially when external energy costs are high.
What were the main findings?: Waste heat recovery coupled with an ORC can increase the first-law efficiency of an electrolyzer from 71.4% to 98%.. The ORC can generate sufficient power to drive hydrogen compression from 30 bar to 200 bar.. The economic viability of the integrated system is highly dependent on electricity prices; it is more attractive when grid electricity prices are high.. Additional capital and operating expenditures for the ORC can outweigh electricity savings at low electricity prices.
What research method was used?: Techno-economic analysis and simulation.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2023 journal from Applied Energy.
What should I do differently in my next project?: When designing or optimizing industrial processes that generate significant waste heat, model the integration of an ORC to assess potential efficiency gains and cost savings, particularly in regions with high electricity tariffs.
What are the limitations?: The economic attractiveness is sensitive to fluctuating electricity prices and the specific costs associated with ORC installation and maintenance.