PhD scholarship in compact energy efficient low charge ammonia units for chiller and heat pump applications

The Department of Mechanical Engineering at the technical University of Denmark has an open PhD position focusing on compact energy efficient low charge ammonia units for chiller and heat pump applications. The PhD project will be hosted by section Thermal Energy. The section covers research and education in energy conversion in a broad sense based on a mechanical engineering foundation with focus on the plants and equipment involved, such as power cycles, heat supply, internal combustion engines, alternative fuels, refrigeration and heat pumps. The research accordingly includes aspects of theoretical work, numerical modeling and experiments.

Research field of the position 

    Efficient production of cold and heat is of high importance for modern society. Air conditioning by use of cold water generated by chiller units is one application of this, which is used worldwide and covers increasing demand in Denmark. Many types of units are available, in particular for medium and large capacity systems, while efficient units for smaller capacity systems are less common. The research will be conducted in close collaboration with the industrial partners in the project. The work will focus on providing detailed insights in optimization of the configuration and the operation of a novel efficient low-charge ammonia unit for both chiller and heat pump operation. This is done by numerical modeling and experimental research. The research will use the experimental results for validation and optimization of the design and control strategy.

Responsibilities and tasks
The focus of the research will in particular be on innovative solutions for configuration and operation of a novel efficient low-charge ammonia unit for both chiller and heat pump operation. The research will be based on numerical modelling where the application of existing methods and tools as well as new approaches will be applied.

The main aim of the research is to suggestions on component designs and system control configuration by means of numerical modeling. Hence, the PhD student will be assist the project partners in designing highly efficient and compact chiller and heat pump units and provide detailed validation of the development part of the project carried out by the partners.

The results of the research work will be disseminated in papers in international journals, by presentations at international conferences. In addition the PhD student will be involved in teaching and supervision of students in fields closely related to the research.

    The PhD student will develop advanced numerical models of the complete chiller/heat pumps unitsThe PhD student will work in close collaboration with industrial partners developing innovative solutionsThe PhD student will communicate and disseminate results to national and international audiences both in industry and academiaThe PhD student will be working closely together with other researchers in the section for development of common modeling tools and solutionsThe PhD student will develop project ideas for students at all levels and will be engaged in the supervision of the projects carried out by the students.

Candidates should have a master’s degree in engineering or a similar degree with an academic level equivalent to the master’s degree in engineering.
We expect the successful candidate to have a background involving numerical modelling of thermal systems and a profound understanding of refrigeration and heat pump systems and technology.
Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see the DTU PhD Guide.
We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.
Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union. The period of employment is 3 years.
You can read more about career paths at DTU here.
Further information
Further information may be obtained from Professor Brian Elmegaard, tel.: +45 4525 4169, email:
You can read more about Department of Mechanical Engineering on
Please submit your online application no later than 31 July 2018 (local time). 
Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link “Apply online”, fill out the online application form, and attach all your materials in English in one PDF file. The file must include:

    A letter motivating the application (cover letter)Curriculum vitaeGrade transcripts and BSc/MSc diplomaExcel sheet with translation of grades to the Danish grading system (see guidelines and Excel spreadsheet here) 

If relevant, you may add additional documents to the list above, e.g., a Research Statement

Candidates may apply prior to obtaining their master’s degree but cannot begin before having received it.

All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.

DTU Mechanical Engineering covers the fundamental engineering disciplines within Solid mechanics, Fluid mechanics, Coastal and Maritime Engineering, Energy systems and energy conversion, Materials and Surface Engineering, Manufacturing Engineering, Engineering design and Product development. The department has a scientific staff of about 157 persons, 95 PhD students and a technical/administrative support staff of about 85 persons.
 DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 6,000 advance science and technology to create innovative solutions that meet the demands of society, and our 11,200 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government and public agencies.

Deadline: 31 July 2018
Unit: DTU Mechanical Eng
Read the job description and apply online

Post expires on Tuesday July 31st, 2018