Air Temperature Variations Due to Different Roofs and Their Impact on Energy Consumption and Emissions: Mexicali University Campus Case Study

Author:

Santillán-Soto Néstor1ORCID,Lambert-Arista Alejandro A.2ORCID,Flores-Jiménez David E.1ORCID,Ojeda-Benítez Sara1ORCID,Cruz-Sotelo Samantha E.2ORCID,Velázquez-Limón Nicolás1ORCID,López-Zavala Ricardo1ORCID

Affiliation:

1. Instituto de Ingeniería, Universidad Autónoma de Baja California, Blvd. Benito Juárez y Calle de la Normal s/n, Col. Insurgentes Este, Mexicali 21280, Mexico

2. Facultad de Ingeniería, Universidad Autónoma de Baja California, Blvd. Benito Juárez s/n, Parcela 44, Mexicali 21280, Mexico

Abstract

Roof surfaces on which air conditioning equipment is installed cause significant air temperature increases around the condensers due to roof thermal properties, resulting in excess electrical energy consumption and greenhouse gas (GHG) emissions. An experiment to quantify such excesses during the summer was conducted at a university campus in Mexicali, Mexico. The air temperatures and surface temperatures for three types of roofs were recorded. Temperatures (condenser inlet air temperatures) were used as the input data to a priori estimate the electrical consumption of a 5-ton A/C equipment working over these different roofs. Temperatures recorded by a nearby meteorological station were used as a reference. The results indicate a differential of up to 4.81 °C, resulting in an excess of electricity consumption of 5.55 kWh and an additional 3.9 kg of CO2 emissions, representing an 8.2% energy surplus and differences of up to 2.1% in electricity consumption provoked by microclimate.

Publisher

MDPI AG

Subject

Atmospheric Science,Environmental Science (miscellaneous)

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