{"id":1641,"date":"2026-09-17T18:30:10","date_gmt":"2026-09-17T16:30:10","guid":{"rendered":"https:\/\/fersisolar.com\/?p=1641"},"modified":"2026-09-17T12:37:12","modified_gmt":"2026-09-17T10:37:12","slug":"is-it-possible-to-clean-receiver-tubes-with-contact-yes-if-you-know-how","status":"publish","type":"post","link":"https:\/\/fersisolar.com\/en\/is-it-possible-to-clean-receiver-tubes-with-contact-yes-if-you-know-how\/","title":{"rendered":"Is it possible to clean receiver tubes with contact? Yes, if you know how!"},"content":{"rendered":"

Concentrated solar power plants (CSP) use high amounts of direct beam irradiation to efficiently produce heat (and electricity, after that heat is fed into a turbine). Parabolic trough collectors (Figure 1) are a highly popular CSP technology and a type of concentrated solar collectors that use receiving mirrors curved in a parabolic shape along their longitudinal axis. These mirrors concentrate solar radiation onto the focal line of the parabola, where the receiver tube is located. Said tube contains the fluid we are heating up to nearly 400\u00baC, enabling high-temperature solar heat. The entire collection of reflectors and receivers is installed on a metal frame that tracks the sun’s movement throughout the day.<\/p>\n

Overall, concentrated solar power (CSP) is a mature technology with several gigawatts of installed capacity worldwide. Still, a major challenge it faces lies in maintaining the optical efficiency of the system despite the persistence accumulation of soiling on the receivers and the reflecting mirrors. In fact, it is estimated that cleaning alone accounts for between 1% and 3% of net revenues in parabolic trough CSP plants[1]<\/a>. In the next paragraphs we\u2019ll discuss the issue in more detail and will introduce a novel solution.<\/p>\n

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Figure 1: Operating principle of a parabolic trough collector<\/em><\/p>\n

Soiling in parabolic trough solar thermal plants<\/h1>\n

Dust particles, pollen, industry emissions and others \u2013 jointly referred to as soiling \u2013 can incur losses of 3-4% even in plants with rigorous cleaning strategies[2]<\/a>. The reasons behind this are manyfold[3]<\/a>:<\/p>\n

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  1. Most evidently soiling blocks and absorbs part of the incoming radiation. Soiling on the reflectors reduces the amount of energy transferred over to the receivers; soiling on the receivers reduces the amount of energy passed on to the heat transfer fluid.<\/li>\n
  2. Besides that, it increases the reflectance of the receiver \u2013 a piece engineered precisely with the goal of absorbing all the light concentrated on it \u2013 further driving losses. Radiation reflected back to the air is energy that cannot be captured by the heat transfer fluid.<\/li>\n
  3. Lastly, soiling scatters part of the light reflected by the mirrors away from the receiver. The receiver is already a small target onto which to concentrate light. Thus, even a small deviation of a few milliradians in the path of the reflected beam of light can cause this energy to be sent away from the receiver and be lost. Yet the receiver is designed to be small out of necessity. Making it larger would mean increasing the diameter of the tube and a tube with a larger diameter has both higher material costs and higher energy losses due to a larger surface area.<\/li>\n<\/ol>\n

    Considering all the above \u2013 energy being blocked, reflected and scattered \u2013 CSP plants invest heavily in maintaining a high cleaning factor in their solar fields by cleaning the two key components of their parabolic troughs \u2013 the reflecting mirrors and the receivers. Maintaining these components is part of the optimization of solar thermal projects.<\/p>\n

    Cleaning component 1: reflecting mirrors<\/h1>\n

    There are two ways to clean the reflecting mirrors \u2013 an in-contact brush that scrubs the collector and dislodges the soiling stuck on the surface and a water spray that pushes away loosely deposited particles. The two methods are seen as complementary and are applied together, as can be appreciated in Figure 2 below.<\/p>\n

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    Figure 2: A specialised truck cleaning a parabolic trough with brush and water spray<\/em><\/p>\n

    Dust and soiling adhere to mirror surfaces through different mechanisms depending on the time it has spent deposed, environmental conditions, and particle composition. Over time, loose dust undergoes dynamic migration and stacking influenced by environmental factors, gradually transforming into more strongly adhered dust. This is why the two cleaning methods work best together \u2013 the water spray removes the loosely deposited material while the brush handles the strongly bound particles.<\/p>\n

    Still, cleaning using the spray method alone is faster because it bypasses the time-intensive mechanical contact process \u2013 more on the reasons why cleaning with a brush is slower in the next paragraph. This speed advantage is useful for more frequent, intermediate cleaning cycles that target only loosely deposited particles, which constitute the majority of recent soiling accumulation. Such cycles are carried out between the mixed brush-spray runs, or when the entire solar field requires rapid cleaning, such as after dust storms or seasonal soiling events.<\/p>\n

    In terms of risk of damage, the reflectors are robust enough to withstand the friction of brush contact when the brush is operated correctly. The brush systems are specifically designed with soft brush materials and water supply integration to minimize any potential surface damage while maintaining effective particle removal. Still, the process requires precise brush positioning, rotation synchronization, and careful contact management to prevent potential scratching of the mirror. Contactless spray cleaning, conversely, does not face this limitation. The mirrors are practically invulnerable to water spray jets, as pressurized water \u2013 while effective at particle removal \u2013 poses no mechanical damage risk to the reflective surfaces.<\/p>\n

    Cleaning component 2: receivers<\/h1>\n

    The receivers, on the other hand, are a different story. Bot the inner and the outer side of the glass tube are covered in an anti-reflective coating. This is a thin, delicate film made of porous material, usually silicon dioxide[4]<\/a>. The pores create destructive interference which greatly reduces the amount of light reflected from the surface of the glass tube and enhances the transmittance by up to four percentage points[5]<\/a>.<\/p>\n

    However, the silicon dioxide particles exhibit low binding force in between each other, requiring special care in the cleaning. Contact cleaning has been observed to cause scratching of the glass tube, reducing its mechanical strength, and peeling off of the coating layer[6]<\/a>. Thus, contact cleaning is explicitly discouraged by receiver manufacturers, and but limits are placed on parameters when spray-cleaning, like water pressure, nozzle diameter and distance between nozzle and receiver.<\/p>\n

    However, spray-cleaning<\/strong> allows sticky soiling particles to embed in the porous structure of the anti-reflective coating and accumulate over the receiver\u2019s lifetime.<\/strong> This issue is compounded by the fact that at present we are still lacking reliable measurement methodologies for the soiling of the receivers[7]<\/a>. The net effect is that plant operators are aware of the progressively decreasing performance of their receivers, but are unable to quantify by how much, and in the absence of superior cleaning options, to take any action.<\/p>\n

    FersiSolar\u2019s in-contact approach for receiver cleaning<\/h1>\n

    In response to this persistent setback in the performance of the solar fields of our clients, FersiSolar has pioneered a new cleaning in-contact method for high-performance solar thermal equipment. This reliable solution gently removes sticky soiling without causing damage to the receivers. The approach is highly effective; when recently tested at a client\u2019s plant, it delivered improvements of<\/strong> 6-7% in the plant\u2019s performance. <\/strong>When asked for a comment, the engineering manager who supervised the tests said:<\/p>\n

    \u201cIt is impressive to see how quickly the plant performance metrics responded to the new cleaning method. We saw a clear and immediate jump in the output of the cleaned sectors. I understand that many colleagues would be apprehensive to start cleaning their receivers in-contact, after all nobody wants to damage their receivers. However, the method of FersiSolar is safe and as long as the operators who do the cleaning are attentive and careful, there is no reason to be worried.\u201d<\/p>\n

    We look forward to expanding the implementation of this novel receiver on-contact cleaning process in concentrated solar thermal energy plants. Overcoming this roadblock in solar receiver soiling management is an important milestone in the competitiveness of this renewable technology. Would you like to know more? Contact us, we\u2019re happy to share.<\/p>\n

    [1]<\/a> https:\/\/doi.org\/10.1115\/1.4039631<\/p>\n

    [2]<\/a> https:\/\/doi.org\/10.1016\/j.joule.2019.08.019<\/p>\n

    [3]<\/a> https:\/\/www.solarpaces.org\/wp-content\/uploads\/Document-3_SolarPACES_Soiling-Guideline_V0.1.pdf<\/p>\n

    [4]<\/a> https:\/\/doi.org\/10.1063\/5.0028751<\/p>\n

    [5]<\/a> https:\/\/doi.org\/10.1016\/j.egypro.2015.03.104<\/p>\n

    [6]<\/a> https:\/\/doi.org\/10.1016\/j.egypro.2015.03.104<\/a><\/p>\n

    [7]<\/a> https:\/\/doi.org\/10.1016\/j.applthermaleng.2026.131546<\/p>\n","protected":false},"excerpt":{"rendered":"

    Concentrated solar power plants (CSP) use high amounts of direct beam irradiation to efficiently produce heat (and electricity, after that heat is fed into a turbine). Parabolic trough collectors (Figure 1) are a highly popular CSP technology and a type of concentrated solar collectors that use receiving mirrors curved in a parabolic shape along their […]<\/p>\n","protected":false},"author":2,"featured_media":1642,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sin-categorizar"],"yoast_head":"\nIs it possible to clean receiver tubes with contact? 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