Some experiences on electricity production at low powers with DSG using parabolic troughs

Almanza, Rafael; Lentz, A.; Santiago, Lic. Guadalupe Leticia Aparicio; Valdés, Alejandro Rodríguez

doi:10.1051/jp4:1999334

Cited by 2 publications

(1 citation statement)

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“…In a former theoretic study it was shown that the stress in the tubes exceed the limits of the material in this case. Almanza (1999) has investigated the influence of the variation of the evaporation section in experimental studies using a parabolic trough collector with an aperture width of 2.5 m and a length of 14.5 m. He observed a bending of the absorber tube causing the destruction of the glass envelopes. As a solution of this problem he suggests the insertion of a copper tube into the absorber tube providing an improved heat transfer in the cross section that reduces the stress to an accepted level.…”

Section: Transient Testsmentioning

confidence: 99%

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

Eck

Steinmann

2002

Journal of Solar Energy Engineering

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This article presents the latest experimental results of the European DISS (DIrect Solar Steam) project. The experiments are subdivided into steady state and transient tests. The goal of the steady state tests is the investigation of the thermohydraulic phenomena of the occurring two phase flow, whereas the transient tests are needed for the controller design. The experimental results are compared to simulation studies. Implications for the plant operation will be discussed. INTRODUCTIONThe direct steam generation (DSG) in parabolic trough collectors is a promising option for the improvement of the reliable parabolic trough technology for solar thermal electricity generation. Several open questions concerning the DSG process have to be answered before a commercial plant can be designed. These are among others the:• operation of single and parallel rows under steady-

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Section: Transient Testsmentioning

confidence: 99%

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

Eck

Steinmann

2002

Journal of Solar Energy Engineering

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DSG Under Two-Phase and Stratified Flow in a Steel Receiver of a Parabolic Trough Collector

Almanza

Jiménez

Lentz

et al. 2002

Journal of Solar Energy Engineering

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The bending of a receiver tube in two-phase flow under stratified conditions when water is first introduced to the hot steel receiver of a 14.5-m long parabolic trough concentrator is presented in this paper. Thermal gradients were observed on the absorber wall at the inlet of the receiver tube during the boiling of water, at low mass flow of 1.6×10−5m3/sec (1 liter/min), and low pressure 4×102kPa. It should be noted that the solar concentrator was focused on the receiver tube, which contained static air before the water was introduced. The introduction of the water produced a change in the temperature difference between the upper and lower sides of the receiver, from 40-60 K to much lower temperatures, in about 45 seconds. The bending of the steel receiver tube occurred when the two-phase flow began. Maximum deflection was observed when the thermal gradient reached a minimum value. We conclude that, when the flow of steam, water, and air exist in a stratified pattern, the combination of these three elements produces the bending phenomenon. The theoretical model, developed to evaluate the experimental data, confirms that the change in temperature gradient produces the bending of the steel receiver tube during this transient stage.

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Some experiences on electricity production at low powers with DSG using parabolic troughs

Cited by 2 publications

References 0 publications

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

Direct Steam Generation in Parabolic Troughs: First Results of the DISS Project

DSG Under Two-Phase and Stratified Flow in a Steel Receiver of a Parabolic Trough Collector

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