Performance Evaluation of the 200-kWth HiTRec-II Open Volumetric Air Receiver

Hoffschmidt, Bernhard; Téllez, Felix; Valverde, Antonio; Fernandez, Jesus Gil; Fernández, Valerio

doi:10.1115/1.1530627

Cited by 129 publications

(65 citation statements)

References 10 publications

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“…One operational strategy is to control the flow rate of the heat transfer fluid, such that POM is stabilized. Using POM facilitates the effective comparison of various receivers operating in different environments [16,19].…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

Experimental evaluation of the performance of solar receivers for compressed air

Kim

Lee

et al. 2014

J Mech Sci Technol

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A challenging issue that arises in achieving a combined cycle with concentrated solar power technology is the development of a solar receiver for compressed air. A solar receiver transfers heat from concentrated solar radiation to compressed air so that the air temperature is sufficiently increased to drive an air turbine. Using a simple modular extension, we have developed three solar receivers for compressed air based on the concept of the tubular receiver. Conventional tubular receivers are generally applied in liquid fluids, such as water or molten salt. Cavities and extended surfaces were designed and incorporated into the developed tubular receivers to improve the heat transfer to air. The receivers were also subjected to performance evaluation tests, which were conducted in the solar furnace of the Korea Institute of Energy Research, with ambient air compressed at 5 bar and expressed in terms of outlet temperature and receiver efficiency. Test results indicated the thermal characteristics of the three solar receivers for their proper use and facilitated the comparison of their performances. The results also provided a guideline to construct and simulate a solar receiver system composed of a series of receiver modules. The problems identified in this study can help improve the solar receiver system.

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Section: Experiments Results and Discussionmentioning

confidence: 99%

Experimental evaluation of the performance of solar receivers for compressed air

Kim

Lee

et al. 2014

J Mech Sci Technol

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“…Moreover, experiments have demonstrated that even partial heating of this receiver will allow achieving volumetric heating. The porosity of the designed receiver is 52% that compares well with Solair 200 [16]. Such receivers are usually made of material with high thermal conductivity, like, Silicon-carbide (~100-300 W/mK) in temperature range from 200-600ᵒC [17,18,19].…”

Section: Open Volumetric Air Receivermentioning

confidence: 97%

Open Volumetric Air Receiver Based Solar Convective Aluminum Heat Treatment Furnace System

et al. 2015

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The current heat treatment processes make use of electricity or fuel for generating heat. Solar energy is available in abundance in the states of Rajasthan and Gujarat in India. Annual global solar radiation of about ≥2400 kWh/m 2 is received in these regions. Use of the abundant solar thermal energy in heat treatment of metals would save energy and fuels. In view of this a concept of solar convective furnace system is described in this paper. As a starting point, heat treatment of aluminium is considered. For this system, requirements of industrial furnace are taken as basis. A scale-down retrofitted furnace is designed and analysed. The importance of different process stages like, solar thermal energy absorption, storage and utilization in design of such a system is presented. A thermodynamic analysis is performed to derive requirements for the achievement of a uniform heating at a predetermined rate. Control strategy to meet the requirements is worked out. Air flow profile in the furnace is analyzed using CFD as a tool. Laser Doppler Velocimetery technique is used for measurement of velocity in a Plexiglas model of the scale-down furnace. Flow analysis using the adopted CFD tool shows non uniformities in air flow profile. To counter this, further modifications and improvements in the furnace structure are suggested. Evaluation of Open Volumetric Air Receiver (OVAR) using installed solar air tower simulation facility is also presented in the paper.

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“…Heating up of the air would advantageously start at the highly irradiated and exposed front before flowing through a serpentine path towards the 'shielded' back. The combination of the temperature increase towards the inside of the receiver and the increased convective heat transfer surface compared to the receiver aperture area is commonly referred to as the 'volumetric effect' [8].…”

Section: The Hpar Conceptmentioning

confidence: 99%

The hybrid pressurized air receiver (HPAR) in the SUNDISC cycle

Heller

Hoffmann

Gauché

2016

AIP Conference Proceedings

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Study and modeling of a pressurized air receiver to power a micro gas turbine AIP Conference Proceedings 1734, 030027 (2016) Abstract. Tubular metallic pressurized air solar receivers face challenges in terms of temperature distribution on the absorber tubes and the limited sustainable solar influx. The HPAR concept aims at mitigating these problems through a macro-volumetric design and a secondary non-pressurized air flow around the absorber elements. Here, a 360• manifestation of this concept for implementation in the dual-pressure SUNDISC cycle is presented. Computationally inexpensive models for the numerous heat flows were developed for use in parametric studies of a receiver's geometric layout. Initial findings are presented on the optical penetration of concentrated solar radiation into the absorber structure, blocking of thermal radiation from hot surfaces and the influence of the flow path through the heated tubes. In the basic design the heat transfer to the non-pressurized air stream is found to be insufficient and possible measures for its improvement are given. Their effect will be examined in more detailed models of external convection and thermal radiation to be able to provide performance estimates of the system.

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Performance Evaluation of the 200-kWth HiTRec-II Open Volumetric Air Receiver

Cited by 129 publications

References 10 publications

Experimental evaluation of the performance of solar receivers for compressed air

Experimental evaluation of the performance of solar receivers for compressed air

Open Volumetric Air Receiver Based Solar Convective Aluminum Heat Treatment Furnace System

The hybrid pressurized air receiver (HPAR) in the SUNDISC cycle

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