Work

Experimental analysis of various expansion devices for subcritical CO2 condensing units.

Year: 2024

Type: conference-paper

Abstract: The aim of this investigation is to experimentally compare the performance of three different expansion devices operating in subcritical CO2 condensing units. The first considered expansion device was the conventional high pressure expansion valve (baseline). The second evaluated expansion device was an ejector relying on the novel pulse-width modulation (PWM) technique to modulate the refrigerant flow effectively. Finally, the PWM approach was used for controlling the ejector motive nozzle while the refrigerant was not allowed to be drawn by the ejector suction nozzle. The results showed that the PWM motive nozzle offers similar effectiveness to a conventional high pressure valve in subcritical regime. Also, it was observed that the PWM ejector could control the high pressure effectively as well as increase the energy efficiency by up to 5.3 % compared to the baseline in transition regime. No need for the installation of the conventional high pressure valve was observed.

Source: University of Southern Denmark Research Portal (University of Southern Denmark)

DOI: 10.18462/iir.iccc2024.1002

Authors: GULLO P., KÆRN M. R.

Institutions: University of Southern Denmark, Instituttet for Produktudvikling (Denmark)

Language: English

Topic: Refrigeration and Air Conditioning Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: green

OpenAlex ID: W4412210208

FWCI:

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