Systems to improve energy efficiency in ships
CREDIT: Korea Maritime & Ocean University
Researchers have developed two novel systems to improve energy efficiency in ships through the recovery of heat lost by the engine
The desire to limit greenhouse gas emissions has increased interest in liquefied natural gas (LNG) ships, which produces considerably less emissions than those running on other fossil fuels. But LNG is expensive, making the maximization of LNG engine energy efficiencies paramount to their widespread use.
At present, LNG ships lose up to 25% of their input heat in the form of exhaust gas. Recovering this heat is key to energy efficiency. In a recent study published in Energy Conversion and Management (made available online on May 31, 2021 and published in Volume 242 of the journal on August 15, 2021), a team from Korea Maritime & Ocean University, led by Dr. Yeong-Seok Choi, developed two novel heat recovery systems that can boost energy efficiency in LNG ships. Dr. Choi explains, “By increasing the energy efficiency of LNG systems, we are directly contributing to environmental protection.”
The research is based on what is called the ‘organic Rankine cycle (ORC).’ In ORC, an organic fluid is first boiled, then used to turn a turbine to generate electricity, during which it loses heat. The fluid is then condensed and reheated in a continuation of the cycle. In LNG ships, ORC also allows the preheating of cold fuel (LNG is stored at -160°C) before burning.
The research team developed two heat recovery systems. The first, the double stage ORC system (DSO), uses the heat from the engine exhaust gas to run two ORCs with connections to two generators. The second, the added double stage ORC system (ADSO), additionally features a third ORC; also, two of its ORCs exchange heat with each other.
The team examined the workings of DSO and ADSO with combinations of different organic fluids. They then performed energy, exergy (maximum work derived from a heat exchange process), and economic analyses on the systems.
They found that while DSO had better overall energy efficiency, ADSO was more suitable for cramped engine spaces. They also saw that performance depended greatly on fluid combination. Overall, the new designs achieved substantial improvements in energy efficiency.
“Although our research is focused on shipping, this work can be applied to several other industries and cryogenic hydrogen research as well,” says Dr. Choi.
With such innovative designs, energy efficient engine systems could soon become an industrial reality for ships.
More from: Korea Maritime and Ocean University
The Latest on: Heat recovery systems
- Here’s how the Inflation Reduction Act’s rebates and tax credits for heat pumps and solar can lower your energy billon August 7, 2022 at 1:37 pm
Congressional action looks to return more money to the pockets of homeowners who opt for energy-efficient upgrades, such as heat pumps and solar panels.
- Explained| The Great Barrier Reef’s recovery and vulnerability to climate threatson August 7, 2022 at 10:19 am
What is the extent of recovery recorded in Australia’s Great Barrier Reef? What are the potential threats to its health?
- NASA’s Additional Artemis I Test Objectives for Space Launch System Rocket and Orion Spacecrafton August 5, 2022 at 5:31 am
During Artemis I, which is scheduled to launch as early as August 29, NASA plans to accomplish several primary objectives. These include demonstrating the performance of the Orion spacecraft’s heat ...
- Waste Heat To Power Market Will Reach USD 3207.4 Million By 2028 With A CAGR of 4.9% - Valuates Reportson August 3, 2022 at 6:00 am
The Waste Heat to Power market is segmented by Type - Steam Rankine Cycle, Organic Rankine Cycles, Kalina Cycle, by Application - Chemical Industry, Metal Manufacturing, Oil and Gas, Others. Global ...
- Extreme heat can exacerbate long Covid symptomson August 1, 2022 at 3:08 pm
Last week’s scorching temperatures created a range of challenges for people in the Seattle area, including for those experiencing long-term symptoms after a Covid-19 infection, known as long Covid.
- The thermal systems market is projected to grow from USD 37.6 billion in 2022 to USD 41.7 billion in 2027, at a CAGR of 2.1%on August 1, 2022 at 7:59 am
The market has a promising growth potential due to several factors, such as stringent emission norms across various countries, which would create the importance of powertrain thermal management. The ...
- Next-gen heat pump could cut energy bills and carbon emissionson August 1, 2022 at 7:01 am
Researchers from the University of Glasgow have developed a new type of heat pump, a flexible heat pump technology, which could help households save on their energy bills and contribute towards ...
- How do heat pumps work? What to know about installation, extreme coldon July 29, 2022 at 1:46 pm
Heat pumps improved performance make them viable for even the coldest of climates. Here's what you should know about heat pumps vs. air conditioners.
- Heat Recovery Steam Generator Market is Set to Garner Staggering Revenues by 2027on July 28, 2022 at 7:10 am
Recently published report by Research Nester on "Heat Recovery Steam Generator Market: Global Demand Analysis & Opportunity Outlook 2027" delivers detailed overview of the global heat recovery steam ...
- The Green Pivot | Cement firms step up waste heat recovery systems as energy costs soaron July 28, 2022 at 4:08 am
The sudden surge in fuel costs and its severe impact on profit margins has pushed cement companies to increase their investments in waste heat recovery systems (WHRS) and green power ...
via Bing News
The Latest on: Heat recovery systems
via Google News