If you enjoyed this article, you might want to check out more in this series: 3 Common HVAC Mistakes Your Facility Should Avoid – New Series, The Impact of Missing Equipment From Your Installed Inventory – Part 1. Chemical formula (R125 44% by weight): CHF 2 CF 3 Chemical formula (R143a 52% by weight): CH 2 CF 3 Chemical formula (R134a 4% by weight): CH 2 FCF 3 Molecular weight: 97.6 Boiling point at 1 atmosphere: -46.2℃ Temperature glide at 1 atm: 0.7K Critical temperature: 72.1℃ Critical pressure: 37.3 bar absolute ENQUIRE It’s what you need to know about refrigerant charge calculations in one quick guide. …under the brand name of Freon. Inaccurate system reporting is compounded when you consider that: 1) very few technicians use a scale when charging a system; and. refrigerant charge in the construction documents. So, when developing budgets, you are always underestimating the need you have to keep these systems operational. Because you, too, could be calculating refrigerant charge incorrectly…. Thanks for reading, and be sure to join us next week for Part 3, the third and final part, of our new series. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! In most cycles it undergoes phase transitions from a liquid to a gas and back again. The molecular weight of refrigerant R134a is 133.4 and its boiling point is -15.1 degree F. It’s what you need to know about refrigerant charge calculations in one quick guide. Forane 134a (Freon134a) C2H2F4 3.5- Freon-11 (Trichloro-fluoromethane) CCI3F 2.6 27.9 Freon-12 (Dichloro-difluoromethane) CCI2F2 2.9 32.5 Freon-13 (Chloro-trifluoromethane) CCIF3 3.4 25.7 Freon-14 (Tetrafluoro-methane) CF4 4.1- Freon-22 (Chloro-difluoromethane) CHCIF2 4.1 41.5 Freon-23 (Trifluoromethane) CHF3 5.1- Freon-41 (Methyl Fluoride) CH3F 10.5- Freon-113 (Trichloro … W = h q                                                    (1), Compression horsepower can be expressed as, P = W / 42.4                                                (2), P = c / (42.4 COP)                                          (2b), p = 4.715 / COP                                             (2c), p = compressor horsepower per Ton (hp/Ton), COP = NRE / h                                            (3), Net refrigeration effect can be expressed as, NRE = hl - he                                             (4), hl = enthalpy of vapor leaving evaporator (Btu/lb), he = enthalpy of vapor entering evaporator (Btu/lb), c = q NRE                                                  (5), d = c v / NRE                                             (6), v = volume of gas entering compressor (ft3/lb), h = hlc - hec                                                   (7), hlc = enthalpy of vapor leaving compressor (Btu/lb), hec = enthalpy of vapor entering compressor (Btu/lb), μ = 100 wa / wt                                         (8), CR = ph / ps                                                (9). Additionally, in the event of a system failure, your new gas charge will be larger than what you reported—We call this “the can’t get 10 lbs of flour into a 5 LB sack” rule. If you under or over fill, then the car won’t operate as needed. The factory charged systems are easy to identify—They are referred to as “packaged,” or stand-alone, and can include systems like vending machines (a few ounces) as well as all the way up to 150 ton packaged roof top units (hundreds of pounds). If you report fewer pounds in a system, then your maintenance needs look lower than they actually are. Think of it this way: Refrigerant is to an HVAC/R system what antifreeze is to a car. Many working fluids have been used for such purposes. Additionally, in the event of a system failure, your new gas charge will be larger than what you reported—We call this “the can’t get 10 lbs of flour into a 5 LB sack” rule. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Ted is the President & CEO of Trakref, a cloud-based HVAC/R and refrigerant management software company that provides unprecedented solutions for commercial properties. 2. Only emails and answers are saved in our archive. Basically, if someone had a 20 ton (non-packaged) unit with multiple air handling units (AHU’s), regardless of the piping, it would be assumed that the unit had somewhere between 60-80 pounds of refrigerant. Related Topics . This gas is poised to replace the other gaseous such as R-410A and R-407C as the preferred gas due to its lower Global Warming Potential. He has spent more than 20 years in the HVAC/R industry, even owning and operating one of the nation’s largest refrigerant reclaim and recycling companies. Problem Calculating refrigerant charge by experience or rule-of-thumb can be inaccurate. All HVAC/R systems are comprised of several key components: Importantly, there are more than 100 million appliances installed in the US. As a result, they only capture between 30-40% of the system charge and therefore under report capacity charge. By 1935, Frigidaire and its competitors had sold 8 million new refrigerators in the United States using Freon made by the Kinetic Chemical Company. by Charles Franklin Kettering invented a "miracle compound" called Freon. (888) 834 – 0233, Copyright © 2019 Trakref®. Freon represents several different chlorofluorocarbons, or CFCs, which are used in commerce and industry. As simple as this process is, most commonly techs and staff only read the “nameplate” capacity on the label of the compressor/condenser section and then they leave off the evaporator and the piping… (we show you how to properly calculate refrigerant charge in this quick guide here). RTA Licence: AU11678 First, field-assembled equipment has 3 components that contain refrigerant: No complicated math required, you simply add together the gas in the pipe, the compressor/condenser section, and the evaporator = total charge. take heat from the contents of a refrigerator or the room (in the case of ACs) and throw the heat out in the atmosphere GAS Valve Outlet and Conn. 2-2 Dimethyl Propane 510 Ethane 350 Ethyl Acetylene 510 Ethyl Chloride 300 Ethylene 350 Ethylene Oxide 510 Fluorine 679 “Freon 12” (Dichlorodifluoromethane) 660 “Freon 13” (Chlorotrifluoromethane) 320 “Freon 13B1” (Bromotrifluoromethane) 320 “Freon 14” (Tetrafluoromethane) 320 “Freon 22” And, feel free to grab a copy of our guide, “How to determine how much refrigerant gas is in your HVAC/R system.”, (Calculating total refrigerant charge—It’s an essential thing for you to know!). The formula of Freon-12 is one of the following: CF4, CF3Cl, CF2Cl2, CFCl3, or CCl4. This colorless gas is better known as HCFC-22, or R-22, or CHClF 2. Frigidaire received the first patent, US#1,886,339, for the formula for CFCs on December 31, 1928. Problem: Freon-12 is used as a refrigerant in central home air conditioners. Isobutane (i-butane), also known as methylpropane, is a chemical compound with molecular formula C 4H10 and is an isomer of butane. out of each cylinder. Chlorodifluoromethane and chloropentafluoroethane mixture of Refrigerant gas R 502 with fixed boiling point, with approximately 49% chlorodifluoromethane. However, starting 10 or more so years ago, regulations started to focus on leaks and indeed agencies began to write requirements that targeted equipment 50 lbs and over…. We don't collect information from our users. Refrigerant A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle. 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