Numerical Simulation Study of Thermal Performance in Hot Water Storage Tanks with External and Internal Heat Exchangers

Yelizaveta Karlina, Yelnar Yerdesh, Amankeldy Toleukhanov, Yerzhan Belyayev (), Hua Sheng Wang and Olivier Botella
Additional contact information
Yelizaveta Karlina: Department of Mechanics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
Yelnar Yerdesh: Department of Mechanics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
Amankeldy Toleukhanov: Department of Mechanical Engineering, Satbayev University, Almaty 050013, Kazakhstan
Yerzhan Belyayev: Department of Mechanics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
Hua Sheng Wang: School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
Olivier Botella: Université de Lorraine, CNRS, LEMTA, F-54000 Nancy, France

Energies, 2024, vol. 17, issue 22, 1-18

Abstract: This paper presents a numerical analysis of two hot water storage tank configurations—one equipped with an external heat exchanger (Tank-1) and the other with an internal heat exchanger (Tank-2). The objective is to evaluate and compare their thermal performance during charging and discharging processes. The numerical model is developed by solving a system of ordinary differential equations using the 4th-order Runge–Kutta method, implemented in the Python programming language. The results indicate that Tank-1 demonstrated a higher charging efficiency of 94.6%, achieving full charge in approximately 2 h and 20 min. In comparison, Tank-2 required 3 h and 47 min to reach full charge, with a charging efficiency of 85.9%. During discharge, both configurations exhibited similar behavior, with an efficiency of 13.63% over approximately 33 min. The analysis showed that the external heat exchanger configuration led to more effective thermal stratification, supported by the Richardson number analysis, which indicated a significant effect of buoyancy during charging. This design advantage makes Tank-1 particularly suitable for applications requiring rapid heating and minimal heat loss, such as in cold climates or intermittent demand systems. The numerical model demonstrated reliable predictive accuracy, achieving an RMSE of 6.1% for the charging process and 6.8% for the discharging process, thereby validating the model’s reliability. These findings highlight the superior performance of the external heat exchanger configuration for fast and efficient energy storage, particularly for applications in cold climates.

Keywords: hot water storage tank; sensible heat storage; charging and discharging efficiency; heat balance model; cold climate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/17/22/5623/pdf (application/pdf)
https://www.mdpi.com/1996-1073/17/22/5623/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:17:y:2024:i:22:p:5623-:d:1517938

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().