Publikasjoner og ansvarsområder
Attaining a higher flexibility degree in CO2 compressor racks
Experimental and numerical investigation of a transcritical CO2 air/water reversible heat pump: analysis of domestic hot water production
As a natural refrigerant, carbon dioxide is safe, economic and environmentally sustainable and can be successfully utilized in heat pump and refrigeration systems operating according to transcritical cycles. This paper describes the development of a CO2 air/water reversible heat pump, specifically...
Heat pump/chiller system for centralized kitchens in India
Non-equilibrium approach in simulations of the R744 flow through the motive nozzle of the two-phase ejector
The ejector technology for R744 systems was continuously improved over the last two decades in the area of control and design processes. The latter should be related with a significant interest on modelling approaches including numerical simulations. However, some limitations of the existing...
PCM CTES integration in industry processes: selected cases
A detailed review on CO2 two-phase ejector flow modeling
Ejector-equipped vapor-compression systems for refrigeration and cooling, relying solely on (R744) as a natural working fluid, are perceived to be an eco-friendly and highly efficient solution for many applications. However, the complexity of two-phase ejector flows makes it very challenging to...
Performance Evaluation of Ejector Based CO₂ System for Simultaneous Heating and Cooling Application in an Indian Dairy Industry
India is ranked first in milk production, and its goal is to increase annual production to 300 million tons by 2024. The dairy industry requires multi-temperature cooling and simultaneous heating. In the present study, the ejector based transcritical CO₂ system with two evaporators (LT at -10°C, MT...
Energy efficient multiejector CO2 cooling system for high ambient temperature
Experimental evaluation of a multiejector CO2 cooling system of 33 kW cooling capacity is conducted for an Indian supermarket at high ambient temperature context. The test-rig is designed to depict the actual supermarket cooling requirements in India with three different cooling temperature levels...
Non-equilibrium approach for the simulation of CO2 expansion in two-phase ejector driven by subcritical motive pressure
A non-equilibrium approach was proposed for highly accurate modelling of the expansion process during two-phase flow in the convergent-divergent motive nozzle of an R744 ejector. Comprehensive mapping of the coefficients used in the source terms of the additional transport equation of the vapour...