The Thermal Potential of Wastewater for Heating and Cooling Buildings: A Case Study of a Low Exergy Building in Madrid-Reference-Cited by-同舟云学术

The Thermal Potential of Wastewater for Heating and Cooling Buildings: A Case Study of a Low Exergy Building in Madrid

Published:2023-08-12 Issue:8 Volume:13 Page:2057
ISSN:2075-5309
Container-title:Buildings
language:en
Short-container-title:Buildings

Author:

Gualotuña-Gualoto Diana¹,Martínez-Pérez Inmaculada¹^ORCID,Laera Rossana¹,Pereda Luis de¹

Affiliation:

1. Construcciones Arquitectónicas y su Control, Universidad Politécnica de Madrid, 28040 Madrid, Spain

Abstract

The use of technologies that allow for the utilization of renewable energies wasted around buildings is one of the ways to ensure the decarbonization of the sector. Wastewater from buildings is a renewable source of thermal energy. Groundwater and rainwater are important components of wastewater that flow into sewerage systems. The main objective of this research is to estimate the thermal potential of wastewater for the heating and cooling of buildings. In this paper, an office building with a low-energy system (TABS) was studied for one year to assess the energy contribution of wastewater in a hybrid system that includes geothermal exchangers and a wastewater exchanger. This study shows that wastewater from sewerage systems that flows faster than 5 L/s can make enough heat to power an office building with a power demand of 45 kW (60 W/m2). The energy contribution of wastewater from the sewerage system is more favorable in heating scenarios than in cooling ones, improving the system efficiency by over 22% compared to geothermal systems. Rainwater enhances cooling efficiency by over 14% compared to geothermal systems. This finding could help to establish a predictive method or guidelines for the design and sizing of heat exchangers in sewerage systems.

Publisher

MDPI AG

Subject

Building and Construction,Civil and Structural Engineering,Architecture

Link

https://www.mdpi.com/2075-5309/13/8/2057/pdf

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