Development of a wet screw compressor model operating with NH3-H2O-CO2

Energy consumption is still growing worldwide and due to the problems of global warming, sustainable developments become of more importance. Heat pumps are one of the technologies that can contribute to energy savings of industrial processes, for example by heat recovery from waste water streams. The focus of this research is to improve the...

Absorption of Ammonia-Water and CO2-NH3-H2O Mixture in Mini-Channel Heat Exchangers

The energy consumption in the industry field is considerable. Saving energy has great potential in many industrial processes. For example, heat recovery from the spent cooling water can be achieved by applying heat pump technology, and the recovered heat can be used for district heating. Previous study indicates that the compression-resorption...

Enhanced performance of wet compression-resorption heat pumps by using NH₃-CO₂-H₂O as working fluid

Upgrading waste heat by compression resorption heat pumps (CRHP) has the potential to make a strong impact in industry. The efficiency of CRHP can be further improved by using alternative working fluids. In this work, the addition of carbon dioxide to aqueous ammonia solutions for application in CRHP is investigated. The previously published...

Thermodynamic Model of a Screw Compressor

A Compressor Resorption Heat Pump (CRHP) is a potential contribution to energy reduction in applications in which waste streams are upgraded, with limited energy addition, into high value process streams for reuse in industry. Previous research concluded that a CRHP with a wet screw compressor is a suitable option for many applications. An...

Mini-channel heat exchangers for industrial distillation processes

In this thesis the technical and economic performance of compression-resorption heat pumps has been investigated. The main objective of this thesis was to improve the performance and reduce the investment costs of compression-resorption heat pumps applied in process industry. A model that is able to capture the performance of most heat pumps...

Minimization of entropy production in diabatic distillation columns with integrated compression resorption heat pumps

In recent years a trend towards more comfortable beds and mattresses has been developed. Water-filled warming mattresses have proofed to increase the comfort of beds. With the climate change, the number of nights with high temperatures during the summer is increasing. SBI has proposed to develop a water-circulated heating / cooling mattress to...