Energetic analysis in a hot water system. A hotel facility case study

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (scheduled for Vol 11, Issue 01 (general)), 1100428
DOI: https://doi.org/10.13044/j.sdewes.d10.0428
Yarelis Valdivia Nodal1, Hernan Hernandez Herrera2 , Roy Reyes Calvo1, Mario Álvarez Guerra1, Jorge Silva3, Miguel Santana Justiz1, Hernan Hernandez Herrera4
1 Universidad de Cienfuegos, Cienfuegos, Cuba
2 Universidad Simón Bolivar, Barranquilla, Colombia
3 Universidad de la Costa, Barranquilla, Colombia
4 Universidad Simón Bolívar, Barranquilla, Colombia

Abstract

This paper evaluates the energy operational performance of a system to produce Domestic Hot Water, from the use of waste heat in a centralized air conditioning system in a hotel in Cuba. The hotel facility has two different chillers capacities, where the system recovers the condensed heat, through a heat exchanger at the compression process outlet. These schemes allow the simultaneous production of air conditioning and Domestic Hot Water, also those considering thermal storage tanks. The system modelling starts analyzing its components and their processes, based on the traditional thermodynamics and heat transfer equations and ends with a validation process. This model estimates a wide range of operating conditions, such as thermal demands of the cooling load, the chiller water temperature, the electricity consumed by chillers, and the climatological variables involved. The system is evaluated in the highest tourism season in Cuba during a year under partial load. Results were validated in a hotel as a study case, which allowed to estimate the thermal potential available in the plant to meet the thermal demand of the hot water required, as well as showing that variations in the chiller operation affect the temperature stability in the hot water system.

 

Keywords: Domestic hot water, energy saving, chiller, hotels, heat recovery

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