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  • Filling Flushing Pumps 

    Solar thermal installations require to fill, flush and pressurize solar thermal panels.

    Solar thermal systems are following a set of procedures during start-up commissioning time. The system is required to be tested for a certain pressure, usually in range 50 to 60 PSI and later on charged with HTF (High-Temperature Fluid) carrier. During maintenance time and usually once a year, any solar thermal system in an area with at least one freeze per year is required to be drained, flushed and refilled in order to regain the functionality it had been listed for and to obtain a buffer protection against degradation. If the HTF becomes slushy the system degrades faster. All this work performed on a solar thermal system can be done using either tool pieced together or professional sets specially designed to fulfill this type of operations. CleanEnergyBrands had done its share of research and is offering state of the art impeller fluid pumps specially designed to complete maintenance and commission of solar thermal equipment and thus to make the sure solar thermal system will deliver best results with no place for errors. Even more, through their constructive mode and through their mobility, this type of tools and equipment are designed to be reused are easy to lease or rent for a similar type of operations and are offering a great return on investment.

     [Tech Support]  Knowledge Base Information for:   Filling Flushing Pumps 
    Read from Knowledge Base and download a pdf file @  Article:  CHARGING SEQUENCE PROCEDURE FOR GLYCOL BASED THERMAL SYSTEMS. 
    Fold | Unfold [ click ]  Read more...  

    Flushing the solar thermal systems:-

    Using glycol based solutions in solar thermal systems it is beneficiary for heat transfer. HTF Glycol based is able to carry more temperature load than pure water. Usually, at a temperature range of 90F to 212F, glycol solutions behave optimal offering moderate low vapor pressure, high thermal stability, low viscosity and in this way a laminar flow which in turn require pumps with a lower power and lower velocity making the system energetic viable. In some of this cases, DC pumps are very suitable being able to carry the heat transfer load, in the meantime, they are connected to a solar photovoltaic panel mounted close to solar thermal panels. In this way, the thermal system works using a natural thermostat (solar photo-voltaic panel). In such a situation we have to make sure that the PV module and the dc pump, which is a low head pump, does not airlock the system. When the HTF temperature rise over 212F (90C) the glycol-based fluid start to deteriorate and therefore it is more as necessary to use propylene glycol rated for 325F thermal capacity for a one-year duration. A very important problem with HTF Glycol based solutions is that they are toxic and the system has to be leak proof tested.

    Another situation refers to the cold period time of the year when ground temperatures can go as low as 4oC and even lower and some of the glycol traces in the solar thermal panels are frozen and are becoming slushy and therefore by system start even if the collector temperature is in the range 75oF to 90oF we will have a deterioration of the HTF carrier inside system. Depending on the microclimate where solar thermal panels are installed it may occur an excessive soiling for those panels and that may lower the HTF quality and in turn, we will have a full stop of the fluid inside system's transfer loop causing the temperature to raise temporary over 212F. Through repetition, HTF carrier will deteriorate.

     In all this situations a complete system draining and system flushing before refill is highly recommended:

    To flush the pipe work and solar thermal collectors we have to use a passive solution which will not react with copper and has a ph between 7.2 and 10. Most of the time this type of solutions contains corrosion inhibitors to treat the copper pipe work and that it means glycol in excess of 50% concentration to water. We can not use any other mix or pure water for the flushing fluid and that based on the fact that it is not possible to perform a full drain of the solar collector and to totally remove flushing fluid. When we drain the system through opening the lower drain valve we will have a real scalding danger. This situation has to be very closely monitored.

    Charging a solar thermal system:-

     Before charging occurs,

    We may consider pressurizing the system close to the system working conditions if the system it is not a closed loop system the pressure level is in the range 50 to 60 psi. Using leak detection fluids we can spot problems in the system and in this way we aim to keep the fluid lost in the range of operational performance year.

    Charging the system Time of charging is a real issue. We have to charge the system during nonfunctional hours and in this way to prevent scalding or in mode accidental to induce pump cavitations. Therefore a fully automated set with a transfer capacity of 5gpm will fill the system with 50 gallons of HTF in an optimal time, Some installer is recommending to cover the solar thermal panels when we pressurize the system before filling them and to keep the cover on top even after during the time the circulation pump is discharging the air bubbles.

    Pressurizing the system has to be done in 5psi to the system pressure. Because of the system venting during the filling, it is a good measure to double the pressure value, 30 PSI plus 1psi for every 2.3 feet pump head is an optimal value.  Altogether the system pressure has not to exceed in this situation 65 PSI the filling has to be performed slowly and we have to make sure that air is vented. Actually, we will go through a repetitive cycle where the system is refilled vented and again refilled and pressurized.

     Post charging system checks,

    When we monitor the system pressure we have to consider the outside temperature. A higher external temperature will induce a higher HTF transfer loop pressure. It is recommended not to have more as 10psi dropped pressure from the initial value in the following 10 days. If the circulation pumps are DC pumps for the first days we have to monitor the pumps close. A higher amount of air bubble generated by heat and a poor system venting may collapse the pumps; they tend to work with a lower head. Therefore by dimension the system or by retrofitting the system with a dc pump, we have to use 45o fittings to smooths the pump head and eliminate vapors and airlocks. At the very end, the installation has to be labeled to prevent accidental opening of the drain valves and the service dates have to be visibly marked. The figure in our representation shows the main flushing and filling valves uncapped.

    The information posted herein has been compiled by Clean Energy Brands from OEM product data and reputable publications. All rights reserved!

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