# Entropy-Driven Environmental Impact Assessment of Condensate-Induced Irreversibility in Integrated Building Energy Systems

## TL;DR

This paper explores how entropy production from condensate in building energy systems can help assess environmental impacts and improve energy management.

## Contribution

The study introduces a novel entropy-driven method to evaluate condensate-induced inefficiencies in integrated building energy systems.

## Key findings

- The average exergy efficiency for distribution lines is 22%, with exergy extinction at 78%.
- Entropy generation potential due to condensation load is 65.3%, and pollution potential is 64.9%.
- The target energy efficiency level for condensate management is set at 33.5%.

## Abstract

In multifunctional and high-energy-density integrated buildings, energy performance and environmental impacts are affected by the environmental conditions in which they are located. Entropy production, which is an output of exergy analysis in energy performance, offers a new evaluation area for energy management in this context. In the study developed for this purpose, the condensate line formed in the steam distribution lines of an integrated building was modeled, and the possible inefficiency potential of the condensate load formed and the usability of the approach developed over entropy production were suggested by energy management. Entropy production due to exergy destruction of distribution lines derived from condensate pump data in the integrated building was evaluated with two environmental indices developed. According to the analysis, the average exergy efficiency for the distribution lines of the integrated building system is 22%, with exergy extinction reaching 78%, indicating a high level of return level. The recovery potential associated with the total exergy flow was calculated as 50.8%, while the entropy generation potential due to the condensation load was 65.3%. From an environmental perspective, the potential for pollution based on entropy has reached 64.9%, while the target energy efficiency level associated with condensate management has been set at 33.5%. The findings suggest that this approach for energy management offers a quantitative evaluation opportunity between thermodynamic irreversibility and environmental performance in buildings. At the end of the study, a comparative analysis of this approach with the classical regression approach for energy management is also given.