Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
PERFORMANCE MAPPING OF A VAPOR COMPRESSION SYSTEM FOR DUAL-ZONE VEHICULAR AIR CONDITIONING APPLICATIONS
Submission Author:
Christian Hermes , Procurando endereço...
Co-Authors:
Pedro Augusto Brüggemann, Gabriel Podgaietsky, Christian Hermes
Presenter: Pedro Augusto Brüggemann
doi://10.26678/ABCM.ENCIT2022.CIT22-0022
Abstract
The present paper is aimed at mapping the thermodynamic performance of a mechanical vapor compression cycle designed for dual-zone vehicular air conditioning. To this end, two purpose-built closed-loop wind tunnel facilities were designed and constructed, one for the condenser unit and another for the two evaporator units (cockpit and cabin). Experiments were carried out for different thermal loads by varying the indoor temperature. The experimental data was assessed by means of a thermodynamic approach that splits the overall (second-law) refrigeration efficiency into two terms, namely internal and external efficiencies that account for the thermodynamic losses that take place respectively inside the refrigeration loop and at the airside of the finned-tube heat exchangers. The internal efficiency, in turn, was divided into two other terms to identify the thermodynamic irreversibilities in the compressor and also in the other components of the cycle. Finally, the compressor efficiency was separated into two other ones to account for the electromechanical and thermodynamic losses in this component. To illustrate the methodology, a sensitive analysis of the condenser airflow, was carried out exploring the consequences of the UA variation on the arrangement performance.
Keywords
air conditioning, vapor cycle system, experimental analysis, performance breakdown
