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HVAC cooling tower water treatment involves several key processes to maintain water quality, prevent system scaling, and control biological growth. The water is typically treated with chemicals such as biocides to prevent algae, bacteria, and fungi growth, which can clog the system. Anti-scalants and corrosion inhibitors are added to prevent mineral deposits and metal degradation within the cooling tower and piping. Additionally, the water's pH, conductivity, and hardness are monitored and adjusted to ensure optimal conditions for heat transfer and equipment longevity. Periodic blowdown, where a portion of the water is removed, helps to reduce the concentration of dissolved solids in the system.

For evaporative cooling systems, we often refer to the evaporative efficiency, which relates the actual temperature drop achieved by the system to the maximum possible cooling (based on wet bulb depression). Evaporative Efficiency = Dry Bub Temp - Supply Air Temp / Dry bulb Temp - Wet Bulb Temp.

Yeah, it's always good to read the installation instructions to avoid such problems.

We focus mainly on the mechanical trades. I would suggest reading the descriptions on the front pages of some of these sites to see what they offer and what they focus on. A lot of these sites cover all trades. Good Luck.

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Not sure how your pocket psychrometer works, but you need at least the dry bulb and wet bulb temperatures to find the relative humidity. With these two values you can determine relative humidity. The dry bulb temperature alone won't work, as the wet bulb temperature indicates the level of moisture for any particular dry bulb temperature.

@@MEPAcademy I have the field piece PRH2, it shows relative humidity % in both readings, when i switch between them it stays the same so i believe its already doing the calculation for me, im only really just switching between WB & DB,

@@JP-sd2cw You're correct, its reading both Dry bulbs and Wet bulb to give you Relative Humidity.

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When the temperature outside is within a certain range, the use of the compressor can be reduced or eliminated. This will save on energy. Check out our two other videos that will give you a better understanding on how using outside air can be beneficial. DOAS units: kzbin.info/www/bejne/joqyh4aMi9SBaJY and Air Side Economizers: kzbin.info/www/bejne/aIamnoGpbdZ6eM0

Please inform hvac technician online course time table and prices

Please inform hvac technician online details and prices

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Depending on the ATS and application it could be from 1 to 30 seconds. Detection takes milli-seconds to a second. then you have the Generator start time which can be 5 to 15 seconds, then less than a second to transfer power to the generator. There are other backup sources that can reduce the time of power transfer, such as UPS for critical facilities which can transfer power in milli-seconds, but has shorter run times so the use of a generator can assist for longer periods. Here are some others: Battery Energy Storage System (BESS), Fuel cells, Solar or Wind with battery storage, Combined Heat and Power (CHP), Micro-Grids, Natural Gas Turbine Generators.

Remember that you need a difference in temperature to move heat from one location to another. The greater the difference or Delta-T, the greater the amount of heat that can be moved. The condensing temperature of the refrigerant in the condenser can vary, but 95F-100F (35C-38C) are good examples for a water-cooled chiller.

@@MEPAcademy I don't understand. As far as I know, boiling points of R32 and R410a are about -52 degree C. The temperature of the refrigerant needs to drop to -52 before it leaves the condenser, right? According to the heat transfer principle, how can you do this by using 29-degree air or water? At best, in the condenser, you can drop the temperature of the refrigerant to that of water or air which is 29.

@@kaan2215 You're thinking is good, but you're forgetting about the pressure. If you look at a refrigerant chart for say R32 and a condenser pressure of 280 to 320 PSI (19.3 to 22 Bar) you'll get your temperatures. The work of the compressor raises the pressure of the refrigerant in order to make it useful for absorbing the heat from the tower water. Hope that helps.

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Yes, in this trade we're professional movers. We move heat around. We either add heat or remove heat from the building using refrigerants or with water-based systems like chilled water and heating hot water. You're right cooling is just the science of removing or moving heat from one medium to another. The heat is never lost, it's just moved from one location to another. Welcome to the heat moving business. :)

An increase in the FPI can increase the heat transfer area and efficiency but at the expense of static pressure. At some point adding more fins per inch is not beneficial for many reasons including condensate retention, difficulty cleaning between fins, energy impact, higher air side pressure drop. The manufacturers coil selection software should be used to find the best coil for the application.

@@MEPAcademy we have minimum or maximum tolerance for FPI?

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The DOAS can be used to handle the latent load, while leaving the sensible load to the terminal units. DOAS units are used in many applications, such as hospitals, Gymnasiums, Schools, Laboratories, Etc. They are used to Comply with ASHRAE 62.1 ventilation requirements, and can be used with energy recovery where applicable. They are commonly used in VRF systems, as most of these Fan Coils can't handle much latent load.

Ok, got it. The latent load taken care of in the DOAS system is to dehumidify the ventilation air & the terminal units in the space lowers the temperature or increases it therefore taking care of the sensible load. I’m really enjoying this channel !

Thanks @jasonjohnsonHVAC

You need to determine the total static pressure (TSP), which is the sum of the static pressure losses across each component, such as the exhaust hood, ductwork, filters, dampers, and any other devices in the airflow path. The first step is to determine the airflow requirement for the kitchen exhaust system, which is typically given in cubic feet per minute (CFM). The required CFM depends on the kitchen equipment, cooking type, and hood size. The exhaust hood manufacturer usually provides guidelines for calculating the required CFM. Let’s say the components have the following pressure drops: Exhaust Hood: 0.4 in. w.g. Ductwork (based on length, diameter, velocity): 0.6 in. w.g. Elbows and Transitions: 0.2 in. w.g. Grease Filters: 0.5 in. w.g. Dampers: 0.1 in. w.g. The Total Static Pressure (TSP) = 0.4 + 0.6 + 0.2 + 0.5 + 0.1 = 1.8 in. w.g. Once you have the total static pressure, select an exhaust fan that is rated to deliver the required CFM at that static pressure. Most fan manufacturers provide performance curves that show the fan’s airflow at different static pressures. It's best to hire a professional mechanical engineer to ensure that the design meets all applicable codes and standards, as the system will need to be submitted to the local code authorities for approval and a permit.

Great to hear.

courses.mepacademy.com/courses/PipingEstimator

Great suggestion! We'll add it to our list of suggested videos. Thanks.

We have some single page proposals on Etsy. www.etsy.com/shop/mepacademy

@@MEPAcademy ......Thanks!

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We don't recommend any one of these. We suggest you browse some of those on this list as they all cover HVAC contractors. read the description of what they offer for your subscription. Some offer free trial periods.

Since we specialize in the Mechanical trades, we don't have any recommendation, but you can easily read the descriptions on several of the sites to see what they offer in their subscription price. Some may also offer a free trail. Good Luck Stucco Superstar

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Not sure which one is best for a roofing contractor as we specialize in the mechanical trades. I would research those that offer a free trail, or those that have a help line and can answer your questions about the type of projects that the site specializes in. Good Luck.

Per the UPC there are 4 WSFU for a bathtub.

An increase in static pressure in an HVAC system typically results in a decrease in total CFM (cubic feet per minute) of airflow. This occurs because the fan or blower in the system must work harder to overcome the higher resistance caused by the increased static pressure.

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You're Welcome to play it in your Classroom form the KZbin platform or our website. Thanks for watching.

We believe you're talking about DuctSox or a similar brand. Here is their website. Let us know if this what you're looking for. www.ductsox.com

@@MEPAcademy Awesome Thank you sir! I appreciate yall!

@@MikeWhiskey427 You're welcome.

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