What happens in a TES tank? An insight into stratified TES systems

ARANER implements leading-edge technologies to achieve the optimal performance of the TES systems throughout the different stages of the project: Computational Fluid Dynamics during the Design Phase and ARAhang Advanced Temperature Monitoring System in Operation.

Stratified TES systems in Design Phase


Figure 1. Detailed analysis of the thermocline formation during the discharging phase of a Thermal Energy Storage tank

Computational Fluid Dynamics (CFD) has revolutionized the industrial design as a key tool for the detailed investigation of the fluid motion and heat transfer. Beyond traditional approaches, CFD simulations provides the ability to predict any fluid flow condition and adds a superior understanding and insight into critical physical phenomena, such as the performance of a Thermal Energy Storage (TES) tank. In other words, CFD enables to perform numerical experiments in a virtual flow laboratory and becomes essential to design any TES system. But most importantly, it ensures beforehand that the stratified TES system and diffusers satisfy the expected requirements of the project.


Figure 2. Distribution of temperature and progression of the thermocline in ARANER TES tanks.

Advanced simulations and computational methods play a key role in the design, development and implementation of ARANER technologies. CFD-based design using reliable computational models and last advances in High Performance Computing (HPC) enables ARANER engineers to assess and optimize the configurations of the tailor-made TES tanks and diffuser systems. These computational tests provide valuable conclusions about the operation of TES tanks and the subsequent implementation of smart optimization techniques based on above-mentioned CFD results leads to obtain the TES tank diffuser design that maximizes the performance of the TES tank.

Stratified TES systems in Operation

Temperature sensors are used in stratified water storage tanks to monitor the distribution of temperatures across the tank height and determine the volumes of warm and cold water, the current thermal storage inventory and thermocline thickness during the operation.

Traditional temperature monitoring systems use temperature sensors embedded in the tank wall. This approach requires the perforation of the tank wall which represents points of potential leaks. Additionally, temperature monitoring systems attached to the tank wall are affected by near-wall temperature disturbance effects and require insertions of at least 2 meters to avoid this influence. The potential condensation effect in the nozzles installed on the walls could also lead to the instrument degradation.

Building on the wide experience of ARANER in Thermal Energy Storage (TES), ARAhang ATMS (Advance Temperature Monitoring System) has been specifically designed by ARANER for its use in TES systems intended for both District Cooling and Heating applications and solves the above mentioned limitations. ARAhang ATMS system monitors the tank fluid temperature at different customizable heights inside the tank via one-line multiple temperature sensors hanging from the tank roof at the requested distance and length meeting the requirement of each customer. Independently of the height of the tank, only one nozzle is required at the tank roof to install one array with up to 60 temperature sensor points inside one cable line.

In this way, ARAhang system provides easy installation and maintenance, excellent accuracy as it is not affected by near-wall disturbance effects and represents a non-intrusive instrument avoiding perforations on the tank wall which minimizes potential water leaks.

ARANER leads INNOVATION in TES tanks development

ARANER is an Engineering Group specialized in tailor-made solutions in the fields of Refrigeration, Cooling and Heating.

ARANER is the leading company in Turbine Inlet Air Cooling and innovative District Cooling solutions such as the design and implementation of the World’s largest Thermal Energy Storage System. ARANER has also developed several engineered-solutions for Oil & Gas, Chemical, Pharmaceutical and Food & Beverage Markets, which increase the efficiency and maximize the client’s cost-effectiveness.


Figure 3. Typical Araner multi-point temperature probe sensor

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