Thermal Insulation With Latent Energy Storage for Flow Assurance in Subsea Pipelines

2015 ◽  
Author(s):  
Mohammad Parsazadeh ◽  
Xili Duan
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Thermal Insulation ◽  
Phase Change Materials ◽  
Heat Transfer Analysis ◽  
Flow Assurance ◽  
Pipeline System ◽  
Fluid Temperature ◽  
Latent Energy ◽  
Subsea Pipelines

Flow assurance is critical in offshore oil and gas production. Thermal insulation is an effective way to reduce heat loss from subsea pipelines and avoid the formation of hydrates or wax deposits that could block the flowlines. This paper presents heat transfer analysis from a subsea flowline with different insulation materials, particularly with nano-enhanced phase change materials (NPCMs) that allow thermal energy storage in the pipeline system. The phase change materials (PCMs) can effectively regulate fluid temperature during production fluctuations or increase the cool-down time during production shutdown. This paper considers a pipe in pipe configuration with different insulation methods; the cool-down times are calculated and compared. The results show that thermal insulation can greatly delay the fluid cool-down process. A significant improvement of cool-down time can be achieved with PCM energy storage under a good conventional insulation layer. Moreover, with nanoparticles in a PCM, the latent energy storage is enhanced thus it takes even longer time for the internal fluid to reach its hydrate formation temperature.

Carbon nanoadditives to enhance latent energy storage of phase change materials

2008 ◽  
Vol 103 (9) ◽  
pp. 094302 ◽  
Author(s):  
Shadab Shaikh ◽  
Khalid Lafdi ◽  
Kevin Hallinan
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Latent Energy

Transient 2-D Heat Transfer Analysis of Encapsulated Phase Change Materials for Thermal Energy Storage

2012 ◽  
Author(s):  
Weihuan Zhao ◽  
Ali F. Elmozughi ◽  
Sudhakar Neti ◽  
Alparslan Oztekin
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Heat Transfer Analysis ◽  
Solar Thermal Energy ◽  
Buoyancy Driven Convection ◽  
Change Material

Solar energy is receiving a lot of attention since it is a clean, renewable, and sustainable energy. A major limitation however is that it is available for only about 2,000 hours a year in many places and thus it is essential to find ways to store solar thermal energy for the off hours. The present work deals with heat transfer aspects of storing solar thermal energy in high temperature phase change materials with melting points above 300 °C. Two-dimension transient heat transfer analysis is conducted to investigate thermal energy storage using encapsulated phase change material (EPCM) for concentrated solar power (CSP) applications. Sodium nitrate, NaNO3, is considered as the phase change material (PCM) encapsulated by stainless steel in a cylindrical shaped capsule. Stream function-vorticity formulation is employed to study the effect of buoyancy-driven convection in the molten salt on the total charging and discharging times for various sizes of PCM capsulated. Simulations are also conducted for a horizontally placed rod inside a flow channel. Storage times are calculated for laminar and turbulent flows of heat transfer fluids transferring heat into EPCM. It is shown that the buoyancy-driven convection in the molten PCM enhances internal heat transfer inside the capsule and hence helps to slightly shorten the total heat transfer times during both charging and discharging processes. Flow characteristics of the heat transfer fluid have profound effect on the nature of phase change process inside the EPCM rod.

Solving Military Vehicle Transient Heat Load Issues Using Phase Change Materials

2015 ◽  
Author(s):  
Johnathon P. Putrus ◽  
Stanley T. Jones ◽  
Badih A. Jawad ◽  
Giscard Kfoury ◽  
Selin Arslan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Cooling System ◽  
Heat Transfer Model ◽  
Heat Of Fusion ◽  
Transfer Model ◽  
Fluid Temperature ◽  
Tractive Effort

Thermal management systems (TMS) of armored ground vehicle designs are often incapable of sustained heat rejection during high tractive effort conditions and ambient conditions. Latent heat energy storage systems that utilize Phase Change Materials (PCMs) present an effective way of storing thermal energy and offer key advantages such as high-energy storage density, high heat of fusion values, and greater stability in temperature control. Military vehicles frequently undergo high-transient thermal loads and often do not provide adequate cooling for powertrain subsystems. This work outlines an approach to temporarily store excess heat generated by the transmission during high tractive effort situations through the use of a passive PCM retrofit thereby extending the operating time, reducing temperature transients, and limiting overheating. A numerical heat transfer model has been developed based on a conceptual vehicle transmission TMS. The model predicts the transmission fluid temperature response with and without a PCM retrofit. The developed model captures the physics of the phase change processes to predict the transient heat absorption and rejection processes. It will be used to evaluate the effectiveness of proposed candidate implementations and provide input for TMS evaluations. Parametric studies of the heat transfer model have been conducted to establish desirable structural morphologies and PCM thermophysical properties. Key parameters include surface structural characteristics, conduction enhancing material, surface area, and PCM properties such as melt temperature, heat of fusion, and thermal conductivity. To demonstrate proof-of-concept, a passive PCM enclosure has been designed to be integrated between a transmission bell housing and torque converter. This PCM-augmented module will temporarily strategically absorb and release heat from the system at a controlled rate. This allows surging fluid temperatures to be clamped below the maximum effective fluid temperature rating thereby increasing component life, reliability, and performance. This work outlines cooling system boundary conditions, mobility/thermal loads, model details, enclosure design characteristics, potential PCM candidates, design considerations, performance data, cooling system impacts, conclusions, and potential future work.

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