Experimental assessment the liquid/solid fluidized bed heat exchanger of thermal performance: An application

Tan, Mehmet; Karabacak, Rasim; Acar, Mustafa

doi:10.1016/j.geothermics.2016.02.009

Cited by 18 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• low overall plant efficiency: to avoid silica scaling, the brine is usually reinjected at a high temperature, hence, full potential of geothermal energy cannot be exploited. • corrosion and scaling problems [7] [8]; • high costs.…”

Section: State Of the Art And Objectivesmentioning

confidence: 99%

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Pardelli¹,

Mannelli

Tempesti³

et al. 2021

E3S Web Conf.

View full text Add to dashboard Cite

Geothermal energy is accredited as a flexible, controllable and green source of energy. Heat exchangers (HXs) are one of the most critical components of a geothermal power plant due to corrosion and scaling phenomena. Hence, improvements in the antiscaling and anticorrosion properties as well as heat transfer performance of the HX materials will lead to smaller, more efficient and less costly systems. EU H2020 GeoHex project relies on the use low-cost carbon steel-based material for HXs. Through modifying the surface with nano porous coating and controlling the surface chemistry, the heat transfer performance of single phase and phase change process will be improved. This paper presents the design and development of three lab scale test rigs to test the effectiveness of innovative materials and superficial treatments on heat exchange with geothermal brine in single, condensing and evaporating phases. The rigs have been equipped with all the necessary instrumentation for control and for data acquisition. In particular, the advanced coatings are applied on a small stainless-steel plate and R134a fluid has been used for heat transfer coefficient characterization in different phase conditions. GeoHex project has received funding from the European Union’s Horizon 2020 research and innovation programme. Grant agreement n.851917.

show abstract

Section: State Of the Art And Objectivesmentioning

confidence: 99%

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Pardelli¹,

Mannelli

Tempesti³

et al. 2021

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…More recently, Shahhosseini et al [42] experimentally analyzed the performance of a periodic fluidized bed heat exchanger and Ehsani et al [43] numerically analyzed the effect of particle properties on a liquid-solid fluidized bed heat exchanger. Tan et al [44] successfully substituted a plate heat exchanger by a fluidized bed heat exchanger increasing the thermal performance by ∼15%. Furthermore, some recent studies, mainly numerical but also experimental, have been focused on studying in detail the heat transfer mechanism in fluidized beds.…”

Section: Aircooledmentioning

confidence: 99%

Exergy recovery from solar heated particles to supercritical CO2

Hernández-Jiménez

Soria-Verdugo

Acosta-Iborra

et al. 2019

Applied Thermal Engineering

View full text Add to dashboard Cite

In this work, the technical feasibility of a fluidized and a fixed bed heat exchanger in a concentrating solar power (CSP) tower for heat recovery applications is analysed using Two-Fluid Model simulations. The heat recovery process analysed in this work corresponds to the discharge of sensible heat from solid particles.In the cases studied, the fluidizing agent of the bed is carbon dioxide (CO 2 ) in supercritical conditions and the particles, which constitute the bed material, are sensible heat storage material. CO 2 is gaining attention in its application as a working fluid in thermodynamic cycles for power generation, especially in transcritical and supercritical conditions due to its high density and excellent heat transfer characteristics. Currently, research is focused on exploring the CO 2 capabilities when used in combination with CSP technologies, together with systems that allow the storage and recovery of the solar thermal energy.Fixed or fluidized beds work as a direct contact heat exchanger between the particles and the working fluid that percolates through the bed material. Several bed configurations are presented to derive the optimal configuration of the bed that enhances the efficiency from both the energetic and the exergetic points of view. The results indicate that a fixed bed heat exchanger produces a maximum increase of availability in the CO 2 flow during longer times than a fluidized bed heat exchanger. Therefore, to maximise the exergy recovery from solar heated particles to supercritical CO 2 a fixed bed heat exchanger is more suitable than a fluidized bed heat exchanger.

show abstract

“…The high HEXs maintenance costs are caused by the interaction between the aggressive geothermal fluid and the heat-transfer fluid leading fouling problems [5]. This fouling issue causes the worsening of two factors in the hydronic system for heating and cooling: the increase of friction pressure losses and the worsening of thermal heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Exergoeconomic Optimization of Polymeric Heat Exchangers for Geothermal Direct Applications

et al. 2021

View full text Add to dashboard Cite

The highest economic costs of a geothermal plant are basically related to well drilling and heat exchanger maintenance cost due to the chemical aggressiveness of geothermal fluid. The possibility to reduce these costs represents an opportunity to push toward geothermal plants development. Such challenges are even more important in the sites with a low-medium temperature geothermal fluids (90–120 °C) availability, where the use of these fluids for direct thermal uses can be very advantageous. For this reason, in this study, a direct geothermal heating system for a building will be investigated by considering a plastic plate heat exchanger. The choice of a polymeric heat exchanger for this application is upheld by its lower purchase cost and its higher fouling resistance than the common metal heat exchangers, overcoming the economic issues related to conventional geothermal plant. Thus, the plastic plate heat exchanger was, firstly, geometrical and thermodynamical modeled and, after, exergoeconomic optimized. In particular, an exergoeconomic analysis was assessed on the heat exchanger system by using a MATLAB and REFPROP environment, that allows for determination of the exergoeconomic costs of the geothermal fluid extraction, the heat exchanger, and the heating production. A sensitivity analysis was performed to evaluate the effect of main design variable (number of plates/channels) and thermodynamic variable (inlet temperature of geothermal fluid) on yearly exergoeconomic product cost. Then, the proposed methodology was applied to a case study in South of Italy, where a low-medium enthalpy geothermal potential exists. The plate-heat exchanger was used to meet the space heating requests of a single building by the exploitation of low-medium temperature geothermal fluids availability in the selected area. The results show that the inlet temperature of geothermal fluid influences the exergoeconomic cost more than the geometrical parameter. The variation of the exergoeconomic cost of heat exchanger with the inlet geothermal fluid temperature is higher than the change of the exergoeconomic costs associated to wells drilling and pumping with respect to the same variable. This is due the fact that, in the selected zone of South of Italy, it is possible to find geothermal fluid in the temperature range of 90–120 °C, at shallow depth. The product exergoeconomic cost is the lowest when the temperature is higher than 105 °C; thus, the smallest heat exchange area is required. The exergoeconomic optimization determines an optimum solution with a total product cost of 922 €/y for a temperature of geothermal fluid equal to 117 °C and with a number of plates equal to 15.

show abstract

Experimental assessment the liquid/solid fluidized bed heat exchanger of thermal performance: An application

Cited by 18 publications

References 16 publications

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Exergy recovery from solar heated particles to supercritical CO2

Exergoeconomic Optimization of Polymeric Heat Exchangers for Geothermal Direct Applications

Contact Info

Product

Resources

About