Life Estimation of Pressurized-Air Solar-Thermal Receiver Tubes

Fork, D. K.; Fitch, J.; Ziaei, S.; Jetter, Robert I.

doi:10.1115/1.4007686

Cited by 34 publications

(33 citation statements)

References 7 publications

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“…A lifetime study was done [20] for a 4 MW solar receiver made of Inconel 617 operating at 900 kPa. A turbine inlet temperature of 1 120 K is a necessary upper limit for tube reliability [20]. The bent tube in a receiver coil is very flexible and thus reduces mechanical stresses from thermal expansion of the tube material [21].…”

Section: Temperature and Efficiencymentioning

confidence: 99%

“…The design of tubular air receivers is challenging due to the combined effects of thermal oxidation, material creep, pressur-induced stress, daily thermal cycling, and thermal shocks [20]. A lifetime study was done [20] for a 4 MW solar receiver made of Inconel 617 operating at 900 kPa.…”

Section: Temperature and Efficiencymentioning

confidence: 99%

Section: Temperature and Efficiencymentioning

confidence: 99%

“…The convection heat loss rate from the open-cavity receiver surface is determined from [15] as follows: (20) The convection heat loss rate from the open-cavity receiver aperture is calculated with Eq. (21):…”

Section: Convection Heat Lossmentioning

confidence: 99%

“…It was found by [18] and [19] that the receiver output power (and therefore efficiency) increases for a tubular receiver, as the flow rate increases, while the air exit temperature decreases. Inconel 600 was used for a tubular solar receiver by [18], supplying about 700 °C as a pre-heater for a secondary solar receiver.The design of tubular air receivers is challenging due to the combined effects of thermal oxidation, material creep, pressur-induced stress, daily thermal cycling, and thermal shocks [20]. A lifetime study was done [20] for a 4 MW solar receiver made of Inconel 617 operating at 900 kPa.…”

mentioning

confidence: 99%

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The efficiency of an open-cavity tubular solar receiver for a small-scale solar thermal Brayton cycle

Roux¹,

Bello‐Ochende²,

Meyer³

2014

Energy Conversion and Management

125

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The first law and second law efficiencies are determined for a stainless steel closed-tube open rectangular cavity solar receiver. It is to be used in a small-scale solar thermal Brayton cycle using a micro-turbine with low compressor pressure ratios. There are many different variables at play to model the air temperature increase of the air running through such a receiver. These variables include concentrator shape, concentrator diameter, concentrator rim angle, concentrator reflectivity, concentrator optical error, solar tracking error, receiver aperture area, receiver material, effect of wind, receiver tube diameter, inlet temperature and mass flow rate through the receiver. All these variables are considered in this paper. The Brayton cycle requires very high receiver surface temperatures in order to be successful.These high temperatures, however, have many disadvantages in terms of heat loss from the receiver, especially radiation heat loss. With the help of ray-tracing software, SolTrace, and receiver modelling techniques, an optimum receiver-to-concentrator-area ratio of A' ≈ 0.0035 was found for a concentrator with 45° rim angle, 10 mrad optical error and 1° tracking error. A method to determine the temperature profile and net heat transfer rate along the length of the receiver tube is presented. Receiver efficiencies are shown in terms of mass flow rate, receiver tube diameter, pressure drop, maximum receiver surface temperature and inlet temperature of the working fluid. For a 4.8 m diameter parabolic dish, the larger the receiver tube diameter and the smaller the mass flow rate through the receiver, the higher the receiver surface temperature and the less efficient the collector becomes. However, the smaller the receiver tube diameter, the higher the pressure drop through the tube and the smaller the second law efficiency. It was found that the 2 receiver with larger tube diameter would perform better in a solar thermal Brayton cycle. An overall solar-to-heat efficiency of between 45% and 70% is attainable for the solar collector using the open-cavity receiver.Keywords: solar, receiver, cavity, tracking, Brayton, efficiency 1.Introduction and background The solar thermal Brayton cycleThe closed Brayton cycle was developed in the 1930s for power applications [ The open Brayton cycle uses air as working fluid, which makes this cycle very attractive for use in water-scarcecountries. The open and direct solar thermal Brayton cycle is shown in Fig. 1 [2]. The parabolic dish concentrator is used to reflect and concentrate the sun's rays onto the receiver aperture so that the solar heat can be absorbed by the inner walls of the receiver. The heat is then transferred to the working fluid (air). The compressor increases the air pressure before the air is heated in the receiver. The compressed and heated air expands in the turbine, which produces rotational power for the compressor and the electric load.In the recuperator, hot exhaust air preheats the colder air before it enters the receiver. For the so...

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Section: Temperature and Efficiencymentioning

confidence: 99%

Section: Temperature and Efficiencymentioning

confidence: 99%

Section: Temperature and Efficiencymentioning

confidence: 99%

Section: Convection Heat Lossmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

The efficiency of an open-cavity tubular solar receiver for a small-scale solar thermal Brayton cycle

Roux¹,

Bello‐Ochende²,

Meyer³

2014

Energy Conversion and Management

125

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Numerical and experimental study of a concentrated solar thermal receiver for a solar heating system with seasonal storage

Wang

et al. 2021

Int J Energy Res

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Summary Solar heating systems are promising, reliable solutions for meeting heating demands, and reducing greenhouse gas emissions. Due to the temporal fluctuations of solar energy and the mismatch between solar energy availability and heating loads, the application of seasonal thermal storage for solar space heating has drawn much attention. Due to the significant reduction of the collection efficiency of flat plate collectors in the temperature range of 70‐95°C, the expansion of the application of concentrated solar thermal (CST) systems has aroused a strong interest. This study describes a demonstration project with a CST receiver designed for a solar heating system with seasonal storage. This work is to reveal the performance of the receiver in the middle and low‐temperature operation through experimental‐numerical approach using a one‐dimensional transient model with a non‐uniform flux distribution. The simulation results agreed well with experimental data for various operating conditions. The receiver had a collection efficiency of about 82% on a typical day. Meanwhile, the heat losses were mainly reflection losses followed by convection (about 5.6%) and radiation (about 2.1%). Additionally, the model was also used to investigate the effect of various operating parameters such as the inlet temperature, outlet temperature, and incident power on the collection efficiency and heat losses. Ultimately, the developed model and on‐site operating data are valuable for broadening the applications of CST receivers and further system simulation and optimization.

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Ceramics for concentrated solar power (CSP): From thermophysical properties to solar absorbers

Ngoue

Grosjean

Giacomo

et al. 2020

Advanced Ceramics for Energy Conversion and Storage

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Life Estimation of Pressurized-Air Solar-Thermal Receiver Tubes

Cited by 34 publications

References 7 publications

The efficiency of an open-cavity tubular solar receiver for a small-scale solar thermal Brayton cycle

The efficiency of an open-cavity tubular solar receiver for a small-scale solar thermal Brayton cycle

Numerical and experimental study of a concentrated solar thermal receiver for a solar heating system with seasonal storage

Ceramics for concentrated solar power (CSP): From thermophysical properties to solar absorbers

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