Share this Job

Herndon, VA, US

Function:  Engineering
Job Category:  Digital Technology and Open Innovation

Mechanical Engineer, Thermal Management

Wärtsilä Energy Storage & Optimization (ES&O) is the leading global energy storage optimizer. Our mission is to deliver integrated energy solutions that build a resilient, intelligent, and flexible energy infrastructure - unlocking the way to an optimized renewable future. By integrating renewables, energy management technology, and storage with traditional energy resources, we reinvent clean energy production from the largest and most complex grids to the most remote and essential microgrids. We play a key role in Wärtsilä’s vision towards a 100% renewable energy future through flexibility, reliability, and integration for a more sustainable world for us all.


Wärtsilä’s Energy Business is looking for a Mechanical Engineer – Thermal management for the Energy Storage & Optimization business. The role will be part of the hardware engineering team.

The ideal candidate will be a self-starter that can work both independently and as part of an interdisciplinary team. The candidate should thrive in a fast paced, constantly changing environment while the industry and company go through substantial growth.


Preferred location(s) for this position is Wärtsilä’s location in Herndon, VA.


Main Responsibilities:

  • Design thermal management solutions for a wide range of applications including heat load study, equipment selection, duct design, and control system
  • Run simulations and/or perform calculations to determine thermal transfer and heat gain to determine adequacy of thermal management system configuration for given application
  • Manage suppliers and projects to ensure timely program deliverables within budget
  • Demonstrable motivation and ability to solve novel, difficult design problems with tight timing constraints
  • Develop various battery cell test experiments, document procedures, and preform the tests in a lab environment
  • Conduct CFD analysis using Ansys Fluent to investigate innovative thermal cooling solutions for battery systems
  • Create analytical and numerical models using various CFD tools to describe system thermal performance
  • Energy storage system auxiliary load calculation, HVAC sizing and system efficiency improvement
  • Digital Twin development of energy storage system in Ansys software environment - ECM and thermal model generation (1D circuit or ROM)
  • Design mechanical enclosures, racks, parts, and/or features intended to be used in the energy storage industry
  • Design mechanical features of battery module packs
  • Develop and document test procedures, assembly and installation instructions, and other document and system documentation
  • Collaborate in a team environment and/or take charge of opportunities to develop optimal solutions for customers and development programs
  • Support manufacturing and system deployment activities by collaborating to resolve issues and ensure products and systems are delivered to specification.


Minimum Experience and Educational Requirements

  • MS degree required, PHD desired
  • 3-5 years of product development and mechanical engineering experience
  • Experience with Solid works, Inventor, AutoCAD, and Ansys
  • Experience with energy storage systems in preferred
  • Knowledge of manufacturing process and techniques (forming, machining, welding and inspection/testing) used in the manufacture of fabricated metal parts a plus
  • Knowledge of heat transfer and thermodynamics
  • Willing to travel up to 20% of the time


Last application date: 21/12/2021

At Wärtsilä we value, respect and embrace all our differences, and are committed to diversity, inclusion and equal employment opportunities; everyone can be their true self and succeed based on their job-relevant merits and abilities.

This is Wärtsilä

Wärtsilä Energy leads the transition towards a 100% renewable energy future. We help our customers unlock the value of the energy transition by optimising their energy systems and future-proofing their assets. Our offering comprises flexible power plants, energy management systems, and storage, as well as lifecycle services that ensure increased efficiency and guaranteed performance. Wärtsilä has delivered 73 GW of power plant capacity in 180 countries around the world. www.wartsila.com/energy


Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers. In 2020, Wärtsilä’s net sales totalled EUR 4.6 billion with approximately 18,000 employees. The company has operations in over 200 locations in more than 70 countries around the world. Wärtsilä is listed on Nasdaq Helsinki. Find out more at www.wartsila.com.

Nearest Major Market: Washington DC