Global Overview

JJ Cooling Innovation Sàrl is a Small or Medium-size Enterprise (SME) founded in 2014 in Lausanne, Switzerland that offers innovative high-tech cooling technology developments for high heat flux/critical cooling service cooling of electronics. The company develops new energy-saving cooling solutions for and together with its clients, specialising particularly in micro-two-phase cooling systems. This work covers the entire range from initial conception, thermal modelling and design of prototypes, development of prototypes together with assistance in their fabrication by the client (or by a 3rd party), iterations between modelling and fabrication feasibilities, development of bench testing setups, thermal testing and assistance in marketing of the final product to the end users. JJ Cooling Innovation offers its services primarily as a high-end thermal engineering consulting company, based on its partners 60-year plus combined experience in University Research including numerous industrial (and EU) sponsored projects. JJ Cooling Innovation also is a developer and licenser of thermal engineering design/simulation software…this goes hand-in-hand with the consulting work for those who need a user-friendly engineering code (and sometimes marketing/product selection code) for designing/selling their new electronics cooling technology to meet the changing needs of their clients.

JJ Cooling Innovation Sàrl is a privately held, limited liability company with paid in capital. The founder and sole current owner is Dr. Jackson Marcinichen. JJ Cooling Innovation Sàrl is founded under the laws of Switzerland (Swiss Tax ID: CHE-428.617.511 TVA). Professor Thome will join the company as a co-owner upon his retirement at the EPFL on July 31, 2018. Both are/will be employees of this company.

See the company’s website at

JJ Cooling Innovation Targets

Who we are: thermal innovators. Prof. Thome’s University Lab (closing on July 31, 2018) in publicly sponsored projects and JJ Cooling Innovation in privately sponsored projects have developed numerous micro-two-phase cooling system prototypes and simulation codes for cooling of electronics for various types of industrial sectors: micro-thermosyphon cooling systems and ultra-compact-heat-exchangers (Provides), HPC datacentre servers (IBM, Oracle and Google), telecommunications (for Nokia Bell Labs), cell phone tower transmitters (Bell Canada), power electronics (ABB), mobile electronics (Qualcomm), avionics (Elettronica, Rome), EUV chip lithography (Carl Zeiss, Germany), industrial refrigeration/heat pumps (Mitsubishi Electric, Edinburgh), CO2 based refrigerated vending machines (Coca-Cola), etc. The company has very special expertise in two-phase cooling of electronics, which is supplanting high-energy-consumption air-cooling technologies and also water/water-glycol types of cooling systems. Two-phase cooling systems are much, much more complex to simulate and make work than these existing single-phase (air or liquid) systems. Hence, this offers a very good opportunity for JJ Cooling Innovation that is one of few companies with two-phase cooling experience. Whilst competitors have only experience in building and testing of numerous prototypes for find a solution for each particular application, JJ Cooling Innovation has developed research-backed simulator codes that allows quickly reaching a final prototype in the first “go” or at maximum with only a single iteration, including simulation of all the potential operating/cooling conditions to be faced in the application. This allows JJ Cooling Innovation to find solutions for its clients within the typical 2-6 month time-frame of its client’s end-users deadlines, creating a win-win partnership.

JJ Cooling Innovation works both on the development/simulation of the thermal components of two-phase cooling systems and on the design/simulation of complete systems. These systems can be categorized into primarily five groups:

  1. Passive pulsating heat pipe cooling cold plates.
  2. Thermosyphon micro-two-phase cooling systems.
  3. Pumped-driven micro-two-phase cooling systems.
  4. Compressor-driven micro-two-phase cooling systems.
  5. Heat exchangers.

To support this innovative product development and consulting work, JJ Cooling Innovation has already developed a large and growing portfolio of in-house simulation codes (property of JJ Cooling Innovation), all written in fast internet compatible languages (primarily Python, a free-ware language). So far, these include simulators for:

    1. Microchannel cold plates for single-phase liquid and two-phase cooling
    1. Air-cooled evaporators (Plain and herringbone fin – round tube)
    1. Air-cooled condensers (Louver fin – multiport flat tube)
    1. Air-cooled condensers (Spiral wire-on-tube)
    1. Air-cooled condensers (Plain and herringbone fin – round tube)
    1. Thermosyphon/pumped/compressor-driven cooling loops
    1. Ultra-Compact Heat Exchangers (UCHE, Provides European patent pending) with double-side microchannels
    1. Tube-in-tube condensers (smooth and finned surface of the inner tube)
    1. Shell-and-tube flooded and falling film evaporators (design and selection modes)
    1. Plate heat exchangers
  1. Pulsating heat pipes (PHP)

    People involed in P(HP)2 project

    Below is a list of persons that will be involved in this project:

    • John R. Thome (M, Ph.D.): Formerly director of 20+ research team at EPFL.
    • Jackson Marcinichen (M, Ph.D.): Founder of JJ Cooling Innovation.

    They have now 9 years of experience of working together. They also have 6 years of experience of working on projects together with Provides. Other work, not mentioned above, has already been delivered to the clients or are on-going:

      • Wettability and charge reduction of CO2 heat exchangers (for Coca-Cola) : improved the thermal performance of CO2 heat exchangers while reducing the heat exchanger volume, and consequently reducing the necessary charge of working fluid
      • Investigation of thermo-hydraulic performance of dry-coolers (for BrainServe) : analysed the dry-coolers energetic performance with an experimental campaign and developed a purpose specific simulation software
      • Thermal-hydraulic performance of high capacity heat exchangers and compact heat exchangers (for Provides) : designed and managed the construction of a new high technology laboratory, including experimental facilities, calibration procedures, software for data acquisition and processing, and technical training
    • Compact cooling thermosyphon system to be applied to high heat flux server chips : designed and simulated all essential components of a loop thermosyphon and evaluated the thermal performance over a range of uniform and non-uniform heat loads (projects together with several different notable Silicon Valley OEMs).