Influence of design on performance of a latent heat storage system for a direct steam generation power plant

Pirasaci, Tolga; Goswami, D. Yogi

doi:10.1016/j.apenergy.2015.10.105

Cited by 73 publications

(18 citation statements)

References 28 publications

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“…On the other hand, there is spray-condensate mixture that reaches saturation temperature before entering the liquid phase. Meanwhile, it is well known that the latent heat exchange is a major factor for the cooling when a large number of droplets are injected into the ambient gaseous phase [19]. Figure 5 shows the optimum curve of pressure and temperature under a 4 kg/s spraying of water from cold leg.…”

Section: Resultsmentioning

confidence: 99%

Simulation of Spray Injection in the Pressurizer Using RELAP5

Dibyo

Susyadi

2017

Atom Indo.

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A modeling research using RELAP5 to assess the pressurizer of a pressurized water reactor (PWR) power plant has been performed. The heater and water injection systems in the pressurizer system of the PWR are of great importance for system pressure control. The heater is designed to increase the pressure while the water sprayer injection is to perform depressurization. Most of studies conducted in the past mainly focused on determining the effects of nozzle spray design and droplet size using testing loops. The purpose of this simulation is to analyze the spray injection flow rate against the pressure characteristics of the pressurizer using RELAP5. Through this approach, the optimum injection flow rate of full scale plant pressurizer can be analyzed. The parameters investigated are pressure and temperature. In RELAP5, the pressurizer tank was modeled with six volume nodes and the heater was modeled by using heat structure. In the model, the sprayer takes water from the cold leg to inject it into the top of tank region. The results showed that the mass flow of about 4 kg/s is the most effective value to limit pressure in the pressurizer to below 15.7 MPa. However, the flow rates of 8 kg/s and more cause overpressure. This simulation is useful to complement the data related to the water flow rate injection systems of the pressurizer.

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Section: Resultsmentioning

confidence: 99%

Simulation of Spray Injection in the Pressurizer Using RELAP5

Dibyo

Susyadi

2017

Atom Indo.

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“…Among the options analyzed, latent heat based systems have emerged as great potential storage systems [10,11]. This technology relies on the energy contained in a material changing its phase, capable of concentrating high energy ratios on narrow temperature ranges.…”

Section: Thermal Energy Storage (Tes)mentioning

confidence: 99%

Performance comparison of a group of thermal conductivity enhancement methodology in phase change material for thermal storage application

et al. 2016

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a b s t r a c tPhase change materials (PCM) are able to store thermal energy when becoming liquids and to release it when freezing. Recently the use of PCM materials for thermal energy storage (TES) at high temperature for Concentrated Solar Power (CSP) technology has been widely studied. One of the main investigated problems is the improvement of their low thermal conductivity. This paper looks at the current state of research in the particular field of thermal conductivity enhancement (TCE) mechanisms of PCM to be used as TES. This work considers a numerical approach to evaluate the performance of a group of TCE solutions composed by particular configurations of two of the principal TCE systems found on the literature: finned pipes and conductive foams. The cases are compared against a single PCM case, used as reference. Three different grades of graphite foams have been studied, presenting a charge time 100 times lower than the reference case for the same capacity. For fins two materials are analyzed: carbon steel and aluminum. The charge times of fin cases are from 3 to 15 times faster, depending on the amount and type of material employed. The internal mechanisms are analyzed to understand the results and locate possible improvement.

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“…This can take the form of a multi-tube scheme where the HTF is passed through the PCM volume Wang et al, 2012;Seddegh et al, 2015;Fornarelli et al, 2016;Pirasaci and Goswami, 2016;Meng and Zhang, 2017), or PCM encapsulations surrounded by the HTF. Examples of the latter are packed beds with PCM encapsulations (Peng et al, 2014;Wu et al, 2016;Zhang et al, 2016f) or PCM tube bundles (Ghoneim, 1989;Pirasaci and Goswami, 2016). Pirasaci and Goswami (2016) characterised the impact of tube bundle diameters and the steam/water flow rate for an NaCl-MgCl 2 eutectic PCM mixture.…”

Section: Thermal Energy Storagementioning

confidence: 99%

“…Examples of the latter are packed beds with PCM encapsulations (Peng et al, 2014;Wu et al, 2016;Zhang et al, 2016f) or PCM tube bundles (Ghoneim, 1989;Pirasaci and Goswami, 2016). Pirasaci and Goswami (2016) characterised the impact of tube bundle diameters and the steam/water flow rate for an NaCl-MgCl 2 eutectic PCM mixture.…”

Section: Thermal Energy Storagementioning

confidence: 99%

“…Similar behaviour has been obtained for the solidification and melting of the PCM using the specified governing heat transfer mechanisms. However, the computational cost and time still remains challenging as the melting and solidification numerical simulations only converge using small time steps (Pirasaci and Goswami, 2016). Hence, it becomes essential to develop simple numerical techniques that require little computational time.…”

Section: Thermal Energy Storagementioning

confidence: 99%

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