A numerical analysis on the performance of DHW storage tanks with immersed PCM cylinders

Pop, Octavian G.; Bălan, Mugur C.

doi:10.1016/j.applthermaleng.2021.117386

Cited by 12 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PCMs can retain and release a good many latent heat in the stage of phase transition, 11 and they have the superiority of high heat storage density 12 and low‐temperature fluctuation, 13 which are the ideal choice of the heat storage medium in thermal energy storage (TES) system 14 . In the solar energy hot water system, a thermal storage device generally uses a water tank 15 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

Zhang

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary For the sake of enhancing the heat storage tank performance, the thermal characteristics and structural improvement of a water tank equipped with phase change material (PCM) were explored in this paper. The influence of PCM on the performance of the tank under conditions was experimentally analyzed, and the optimal working condition is determined by comparing the difference in effective heat storage rate under different inlet flow rates and the temperature of the water. The concept of “heat transfer blind zone” is introduced and analyzed, and the temperature and velocity field in PCM tanks with different structures are numerically compared. The results show that the addition of PCM makes the discharging time and effective water supply increase by 12.0% and the charging time increase by 6.0%. As the inlet flow rate and temperature of water rise, the thermal storage capacity reduces, and the effective heat storage rate rises first and then drops. The PCM tank has the optimum performance at the inlet water temperature of 70°C and the inlet flow rate of 15 L/h. The inlet and outlet setting up and down has the best effect on eliminating the “heat transfer blind zone” in the water tank. The research results have a good reference value for the design and realistic operation of the phase change heat storage tank.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

Zhang

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…According to the findings, 15% of the PCM inside the water storage tank leads to an additional 70% heat storage capacity. Pop and Balan 7 investigated how PCM improved the performance of storage tanks for heating a swimming pool under heavy load conditions. When compared to the pure water tank, it was discovered that the immersed PCM cylinders contribute to a 25% reduction in nominal volume.…”

Section: Introductionmentioning

confidence: 99%

Operating performance of multi‐modular water‐phase change material tanks for emergency cooling in an underground shelter

Zeng

Yuan

Cao

et al. 2021

Intl J of Energy Research

View full text Add to dashboard Cite

Summary Latent heat thermal energy storage can not only alleviate the mismatch between supply and demand but also improve the performance and dependability of the energy system. Unfortunately, previous research achieves a specific engineering load shifting using a single water‐phase change material (PCM) tank, the volume of which is tailored to the specific cooling or heating load. This paper proposes the concept of multi‐modular water‐PCM tanks (MMWPT), which offer flexibility and are simple to be mass‐produced, as thermal storage in an underground shelter's emergency mode. The thermal inertia of the geothermal energy is used to remain the PCM at solid state at first and to naturally cool the tank once they are melted. The mathematical model is created in MATLAB and validated by experiment with an NMBE of less than ±10% and RMSE of less than 30%. In addition, the MMWPT's thermal performance in various matrixes was investigated in an underground shelter where the peak load occurs suddenly and with low frequency. The result reveals that the ∆Twater in the scenario with matrix form of N (number of tanks in series) × 5 (number of tanks in parallel) is almost four times as that with matrix form of N × 1. By separating the water into five parallel water tanks, the corresponding EDD is 1.27‐1.28 times larger. Changing the N from 1 to 2 and 3 could increase the EDD by 3.0%‐12.5% and 5.9%‐25%, respectively. Three acceptable MMWPT matrixes were presented using the effective discharging duration (EDD) and temperature drop as assessment criteria. Additionally, PCM with a maximum phase change temperature (Titalicpch_PCM) of 19.41°C and a connection matrix of 3 × 4 is recommended when using a single charging cycle or active cooling approach. Otherwise, a Titalicpch_PCM of 22.41°C with a connection matrix of 3 × 5 is advised. This research is planned to give references for using the MMWPT in underground shelters to shift loads.

show abstract

Application of PCM-based Thermal Energy Storage System in Buildings: A State of the Art Review on the Mathematical Modeling Approaches and Experimental Investigations

et al. 2022

View full text Add to dashboard Cite

A numerical analysis on the performance of DHW storage tanks with immersed PCM cylinders

Cited by 12 publications

References 28 publications

Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

Experimental and numerical study on thermal performance and inlet and outlet structure optimization of phase change heat storage tank

Operating performance of multi‐modular water‐phase change material tanks for emergency cooling in an underground shelter

Application of PCM-based Thermal Energy Storage System in Buildings: A State of the Art Review on the Mathematical Modeling Approaches and Experimental Investigations

Contact Info

Product

Resources

About