Home / Blog / How do I compare air compressor efficiency? All photos courtesy of SUTO iTEC. Save a buck today with Quincy Compressor. Air compressor manufacturers measure the performance of air compressors according to international standards (i. e., ISO 5389 for centrifugal air compressors) and describe the results in their data sheets. However, as time goes by, an on-site measurement can be very useful. Also, air losses and control-air use increase with pressures within an air compressor so the compressor motor isn’t overloaded at higher pressures. With a proper flow meter and some mathematics this task is manageable. There are several simple questions, which eventually explain the performance of an air compressor: To answer these questions, you may want to measure your air compressor on your own. The pressure drop across an air filter can reduce the intake air pressure by 1 to 3 percent. Checking the oil level is standard procedure for every time any machine of this kind is used. Add an Air Receiver Adding an air receiver tank will help buffer short-term demand chances, eliminating the need for on and off usage. To get to the bottom of how much your air compressor system is costing your organization, careful attention is needed to provide a thorough analysis. It’s important to understand the operating flow at the air compressor discharge is made of two components: To measure the water contents precisely, it's required to measure the humidity in the pipe. CFM is stated in two different forms, piston displacement (PD) or actual cubic feet per minute (acfm). Cite 29th Jun, 2017 It can damage your ears, affect your behavior and so on. To read similar Air Compressor Technology articles visit airbestpractices.com/technology/air-compressors. How to check the efficiency of an Air Compressor? If you want to compare it with the air compressor data sheet, make sure to use the same intake conditions. Quincy Compressor has long maintained a reputation for manufacturing quality air compressors that combine efficiency and durability. Meanwhile, the air that an air compressor sucks in contains humidity (water vapor), and the air density (air per m3) changes with variation in the altitude, temperature and weather patterns. From there, you’ll be well equipped to make decisions regarding cost savings. By opting to switch to our new QGD and QGDV units, you can expect efficiency gains of up to 20%. For example, a compressor using petroleum-based oil needs an oil-change every 500 hours of service. Simply allow the compressor to build to top pressure with the air hose and all other tools and components hooked up. Water flow, which is removed later in the air-treatment section. For an air compressor operating load/unload this blow-down air can quickly become a big error, especially at low average loads. Temporary performance measurement, done as part of system assessments, or before investing in a new air compressor. Cubic feet per minute or cfm is a measure of air flow the compressor can create. 9, based on the results of previous investigations [24,49].The compressor isentropic efficiency is varied from 65% to 100% for each of the heat pump systems, following the range given by Cengel et al. Permanent performance measurement, which is performed to monitor the performance at all times in order to trigger services or overhauls timely. Air used to “pump up” (pressurize) the air compressors internal volumes is measured as air delivered, but it's only stored within the air compressor. Ability to handle high velocities and temperatures up to 70 °C. These equations will provide us with theoretical values of the power requirement and the thermodynamic efficiencies of the compression process. As long as the air and oil are sufficiently filtered throughout a given cycle, the air compressor can be expected to produce cool air at consistent volumes with an overall smooth performance from the machine. Once completed, you’ll be able to estimate how much you currently spend on your air system. Air Compressor Technology Monthly e-Newsletter, Control Strategies for Multiple VFD Air Compressors - Webinar Recording, airbestpractices.com/technology/air-compressors, Sullair Introduces Oil Free Portable Air Compressor, BEKO Appoints Yannick Koch as Managing Director, Victaulic Appoints Dr. Richard A. Bucher as Chief Executive Officer. So it can be seriously injurious to your health. Considering the mechanical efficiency of a compressor. Clean the cooler regularly. But then we also need to account for the mechanical efficiencies and loss of power in driving the compressor equipment as well as the electrical motor. The types of flow meters allowed by ISO 1217 initially calculate a mass flow of air, which is then converted to an intake volume flow rate based on a value for the density of the air at the intake to the air compressor. The key to optimal air compressor efficiency is to maintain the integrity of your entire pneumatic system. ). It can be complicated to determine the efficiency of an air compressor. The oil is what lubricates and cools the engine, thus running an air compressor with low oil level will kill the engine, which is difficult to fix … If you measure only amperes, you cannot know the power factor and the imbalances between the three phases. When you are purchasing a compressor, it can be difficult to decide which one to buy. The so-calculated FAD is what the air compressor “really” delivers. 2 Stop the plant, isolate electrically and front seat the discharge service valve. But air can be compressed easily and its volume changes with the temperature. For more information, visit www.suto-itec.com. The bottom line is an air compressor is only as efficient as the integrity of the infrastructure that supports it. Of importance is what comes out and not what goes in! The power equation is as follows: Performance measurement of air compressors is important. Also, keep track of the energy consumption to ensure the investment will pay off in a very short time. These details are often lost in the day to day array of operations occurring at your facility. To judge the performance of an air compressor, an on-site measurement is recommended. If you find the ratio is very low, say 50%, too many of the compressor hours are spent running unloaded, which is costly and wasteful, and further investigation is … An air compressor is a device that converts power (using an electric motor, diesel or gasoline engine, etc.) How to Calculate Air Compressor Efficiency, Last updated on: February 26th, 2020 at: 02:56 pm, © 2021 Quincy Compressor. Because electricity is such a big part of the total, you should be shopping for the one with the best efficiency. The requirements for a flow meter used at the compressor discharge include: The following table provides a comparison of the most common flow meter principles toward the preceding requirements. 5 Steps to Achieve Maximum Air Compressor Efficiency. FAD uses volumetric flow units such as m3/min and l/s etc. Increasing air compressor efficiency does not have to be a daunting task. Air filter elements are evaluated using an industry wide standard (ISO5011) and their performance is expressed as an efficiency level. Promoting air compressor system efficiency is a smart way to make your organization run more effectively and sustainably. This would mean the specific power at the 50% point would be roughly 50% higher than at full load (75/50 = 1.5 times full load sp). 2. This includes the entire air compressor, all fittings, air hoses and tools. A dirty air intake filter can also vary the intake airflow by 2 to 3 percent. A quick estimate of compressor efficiency can be done by taking the ratio of the total loaded hours divided by the total run-time hours. Compressed Air Unit Converter Calculation of Pump Up Time OR Check Efficiency of an Air Compressor. To set a baseline of efficiency, we offer this efficiency quotient worksheet that’s broken down into multiple categories, each assessing a specific component of your compressor system. How to know if an air compressor is delivering the promised CFM levels? Airflow, which is what you want to measure. Download the slides and watch the recording of the FREE webcast to learn: Quite often, amperes alone are thought to be an accurate measurement of kilowatts (kW), which is then used to calculate full-load specific power (m3/min/kW) or to estimate flow (m3/min) of an air compressor. Interestingly, when the humidity is set to a value between 80 to 99 percent, the measurement error is not more than ± 0.3%. Others are not suitable because they cause a pressure drop, which in turn, leads to a waste of energy and money. It is a simple piece of machinery, with many important components which are vital for its proper operation and functioning. The isentropic path exponent (k) or ideal gas heat capacity ratio (k=C P /C V) can be calculated by the correlation presented in the May 2013 TOTM: Where: T = Temperature, K (°R) = Gas relative density; ratio of gas molecular weight to air molecular weight. If your AC isn’t working, there’s a good chance that a faulty compressor could be the culprit. This standard includes packaged rotary screw air compressors as well. We invite you to take advantage of a professional’s opinion on how your compressor system is functioning and where you can increase efficiency. Ideally these are the actual conditions, but for convenience, ISO 1217 suggests the following conditions, provided the actual conditions are within an allowable tolerance: Corrections are then made for the intake humidity and the amount of water condensed upstream of the flow meter and the speed of the motor compared to its rated speed. However, these measurements are performed in the factory conditions and not real on-site conditions. Check the Oil and Fuel Level. Pressure: 125 psi - 150 psi Flow: 16 ft³/min - 460 ft³/min Power: 5 ch - 100 ch. Analyzing a system for existing air leaks and fixing those leaks can dramatically reduce energy bills while simultaneously increasing the system’s efficiency. This efficiency level is determined by feeding air containing a known concentration of standard test dust into the air cleaner until the filter reaches the end of its life. Just because we can, let’s take a minute and ensure your air compressor is in good working order. If you suspect the drop in your compressed air systems’s efficiency is resulting from the dirty thirty, try setting up a pressure gauge to double check your air compressor’s performance. Check the Filter. 3 Slacken off the compressor head bolts slowly to release … In many ways these flow meters beautify/exaggerate the performance because they do not consider: An air compressor user should insist on measurement at the outlet to determine the performance. This is incorrect! To sum up, air compressor efficiency always depends on the design and preventative maintenance measures taken to ensure that the system runs smoothly. It can be seen, for example, that at 3 gal/cfm capacity the part-loaded air compressor might consume 75% of its full load power while delivering 50% of its full load flow. For example, the compression module in an 8-bar rotary screw compressor operates at a different speed than in a 10-bar machine. 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