Performance study of latent heat accumulators: Numerical and experimental study

Lissner, Michael; Tissot, Julien; Leducq, Denis; Azzouz, K.; Fournaison, Laurence

doi:10.1016/j.applthermaleng.2016.03.011

Cited by 17 publications

(5 citation statements)

References 28 publications

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“…Mostly, fins are used on the side of the lowest thermal conductivity fluid in order to increase the heat transfer area and, subsequently, the heat transfer rate [80][81][82][83][84][85][86][87][88][89][90]. It is one of the common methods used to enhance the apparent thermal conductivity of a PCM.…”

Section: Finned Surfacesmentioning

confidence: 99%

“…The performance and storage capacity of the heat accumulator is influenced by geometrical properties of fins such as pitch, height, and thickness, and thus, care should be taken in their selection. In order to optimize these geometric parameters, a heat accumulator consisting of alternating coolant channels and PCM channels, with brazed fins, as in Figure 5, was designed and investigated experimentally and numerically [82]. A model was developed to simulate various configurations of the heat storage system.…”

Section: Finned Surfacesmentioning

confidence: 99%

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Laboratory Configurations for PCM-TES Materials: A Review

Munteanu¹,

Tudose²

2022

J. Adv. Therm. Sci. Res.

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The global energy crisis and the negative impact on the environment of the existing technologies have constrained researchers to capture several types of waste energy using different technologies and materials. For heat, energy harvesting technologies include a major source, the sun, and as an effective storage media, phase change materials. The current review covers experimental laboratory configurations used for thermal energy storage (TES), mainly with phase change materials as working fluids. The required characteristics of PCM-TES materials are covered. Geometric configurations, starting with simple shell-and-tube heat exchanger (HX), other multiple constructive alternatives, plate HX, and also modular HX or fixed and fluidized beds systems are overviewed in order to concentrate on heat transfer characteristics important for TES systems operation and optimization. Emphasis falls on important constructive characteristics for thermal performance, such as the heat charge and discharge rates, within specific temperature ranges, depending on the type of TES fluid used, the energy storage capacity, or density. The advantages and disadvantages of each constructive piece of equipment are critically reviewed. Some comparisons among designs are also included, with an accent on beneficial alterations to improve thermal features.

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Section: Finned Surfacesmentioning

confidence: 99%

Section: Finned Surfacesmentioning

confidence: 99%

Laboratory Configurations for PCM-TES Materials: A Review

Munteanu¹,

Tudose²

2022

J. Adv. Therm. Sci. Res.

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“…where m cir is the mass flow of circulating water in heat network; C p is the specific heat of circulating water in heat network; T out and T in are the outlet and inlet water temperature of heating station. When it is necessary to make power output increase with a rapid ramp rate, the heat source extraction flow is regulated to decrease, and meanwhile HA [33] will discharge to compensate the decrease of heat source. The discharge flow of hot water is:…”

Section: Compensation Characteristics Of Hamentioning

confidence: 99%

Improved Boiler-Turbine Coordinated Control of CHP Units with Heat Accumulators by Introducing Heat Source Regulation

Wang¹,

Sun

Jing

et al. 2018

Energies

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It is significant for power system stability to improve the operation flexibility of grid-connected units. Such improvement has always been a hot topic, especially for coal-fired units. In recent decades, it has become increasingly urgent and challenging as large-scale fluctuant renewable energy is connected to the power grid. Boiler-turbine coordinated control strategy (CCS), which is employed to perform unit load control according to automatic generation control (AGC), has a slow ramp rate in general on account of large delay and inertia of boiler, so to improve the unit operating flexibility, it is necessary to explore usable heat storage and optimize the control strategy. In combined heat and power (CHP) units with heat accumulators, their heat and power are decoupled. Therefore the extraction steam that goes to the heating station can be regulated flexibly even operating in “heat-led mode”. The change of extraction steam flow has a significant influence on the turbine power output, so we propose to improve the load-following capability of CHP units by regulating the heat source flow. In this paper, the influencing model is set up, and it is about heat source flow variations on the electric power output. The load control strategy is further optimized and designed through combinations of CCS and heat source regulation. Finally simulations and analysis are performed on a 330MW CHP unit, and the results reveal that the power ramp rate with our strategy is two times faster than that with traditional strategy.

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“…Heat storage with PCM is also used in heat exchangers and thermal storage units. These solutions function both in the long and the short term (Lissner et al 2016). In their work (Constantin et al 2015) analysed the possibility of storing heat in a conventional residential building exchanger by using PCM.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of the Energy Efficiency of Transparent Partitions with a Thermal Storage Unit

Musiał¹

2020

J. Ecol. Eng.

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The article presents the results of experimental research and a mathematical analysis of the energy efficiency of a PCM-modified transparent partition. The study was carried out during the summer season and heating season for 5 months under temperate climate conditions in Rzeszów (Poland). The solution under investigation allows for short-term storage of heat within a building window, owing to the high value of melting/freezing enthalpy of approx. 185 J/g, and the phase change material (PCM) applied. The research was conducted in parallel over two identical windows, with only one of them being modernised with a phase change thermal storage unit. The obtained results showed the possibility of improving the thermal balance of the window by 9.99%, and a more favourable adjustment of gains from solar radiation to the profile of heat demand of the adjacent room by 15.02%, compared to the reference window. The obtained results also allowed the numerical model describing the non-stationary heat exchange within the phase change material to be verified, using the solution of a Stefan problem. The obtained model was created using the equations of finite difference method in the Matlab environment. The verified model is highly compatible with empirical quantities, and constitutes a useful tool for simulating the distribution of heat storage in a PCM storage unit over time. This allows the heat gains resulting from the use of the tested storage units in the building windows to be estimated.

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Performance study of latent heat accumulators: Numerical and experimental study

Cited by 17 publications

References 28 publications

Laboratory Configurations for PCM-TES Materials: A Review

Laboratory Configurations for PCM-TES Materials: A Review

Improved Boiler-Turbine Coordinated Control of CHP Units with Heat Accumulators by Introducing Heat Source Regulation

Experimental and Numerical Analysis of the Energy Efficiency of Transparent Partitions with a Thermal Storage Unit

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