External gear pump: 90 x 207 / 600 x 0.85 = 36.5 kW
Volumetric efficiency is determined by dividing the actual flow delivered by a pump at a given pressure by its theoretical flow. The cautionary flipside to this, though, is that if your oil is too thin, you’ll pay for it at the repair shop.
The equivalent Ideal Run Rate in our example is 60 parts per minute. The second stage of OEE improvement (optimisation) can be carried out to remove chronic losses. If when tested, the above pump had an actual flow of 90 liters/minute at 207 bar (3000 PSI), we can say the pump has a volumetric efficiency of 90% at 207 bar (90 / 100 x 100 = 90%). If you don’t consider hydraulic fluid to be a critical component of any hydraulic system, you may suffer the same fate as these engineers. This directly influences the hydraulic system’s operating oil temperature, which largely determines Oil Viscosity, completing the Power Efficiency Diamond. The Performance metric does not penalize for Quality. He is a Textile Engineer and a Postgraduate in Fashion Technology from NIFT, New Delhi. Bent axis piston pump: 90 x 207 / 600 x 0.92 = 33.75 kW The site editor may also be contacted with questions or comments about this Open Educational Resource. 12.3.3. ... Why does the OEE formula in Figure 1 include availability (A), performance (P) and quality (Q)? If one can bring in additional resources (or lease out unused resources to other projects or business units) then it may be more appropriate for example to use an expected net present value analysis.
Finally, OEE is calculated by multiplying the three OEE factors. Formula: Run Time / Planned Production Time, Example: 373 minutes / 420 minutes = 0.8881 (88.81%). choose the product catalog of your country. So Wh can be converted to Btus knowing that there are 3.412 Wh in a Btu. Calculation of the overall heat transfer coefficient U i for the inner tube surface area A i without fouling 253. Calculation of the weighted fin efficiency η W 251. On the other hand, there is a viscosity range where fluid friction, mechanical friction, and volumetric losses are optimal for hydraulic system performance. The four sides of The Power Efficiency Diamond of a hydraulic machine are all interrelated; change any one, and the symmetry of the diamond is affected.
Great job! The possibility of variation in ambient air temperature, particularly if the machine is moved between locations with different climatic conditions, is fairly obvious. So at this flow and pressure, the heat load or power lost to heat for each pump is: With annual sales revenue of more than € 2.3 billion, the KSB Group is one of the leading suppliers of pumps, valves and service. Fluid viscosity is one of the factors that determines whether full-film lubrication is achieved and maintained. Applying this method to the above power plant example: Overall Efficiency=[ 88 Btus 100 Btus ]×[ 36 Btus 88 Btus ]×[ 35 Btus 36 Btus ] =0.88×0.41×0.97 =0.35 or 35%. But with fuel consumption being more important than any modest saving in cooling capacity, the idea of paying more for a pump that resulted in the oil being kept at a lower operating temperature—but increased fuel consumption—was irreconcilable to the machine’s engineers.
Calculation: Performance (Productivity) = (Parts Produced * Ideal Cycle Time) / Operating time[6]. The best pump efficiency (ηopt) is the highest efficiency for the rotational speed and fluid handled as specified in the delivery contract. Performance is the second of the three OEE factors to be calculated. We'll focus on your equipment, your process, and your challenges. Learn how and when to remove these template messages, Learn how and when to remove this template message, OEE and derived indicators TEEP, PEE, OAE, OPE, OFE, OTE and CTE, "OEE Overview - with Calculation Methods", "Calculate OEE - Simple Calculator & OEE Formulas", "Top Three Methods on how to Fudge Your OEE", https://en.wikipedia.org/w/index.php?title=Overall_equipment_effectiveness&oldid=977096122, Articles needing additional references from May 2013, All articles needing additional references, Articles lacking in-text citations from May 2013, Articles with multiple maintenance issues, Articles with unsourced statements from August 2013, Creative Commons Attribution-ShareAlike License, OEE is calculated with the formula (Availability)*(Performance)*(Quality), (Availability= 86.6%)*(Performance=93%)*(Quality=91.3%)= (OEE=73.6%). If there is lost time, overall efficiency will be less than the on-standard efficiency. Now letâs work through a complete example using the preferred OEE calculation. 1 and 2 Pump efficiency, Fig. The efficiency is the work output from an operation, divided by work input from the same operation, and expressed as a percentage. We'll assume the output flow and pressure for both pumps is 90 liters/minute at 207 bar: And along the way, we are dumping about 98.5 units of energy during various steps of conversion processes, and we're using 1.5 BTUs and 1.5%. If efficiency of each step is known, we can calculate the overall efficiency of production of light from coal in the ground. available for FREE download here. Experience may develop over time. In such a condition, higher quality may be far more important The machine operator is worked 8 hours and he has produced 400 garments in the given job. Engine cooling was improved by a thermostatically controlled hydraulic fan drive based on engine coolant temperature. The losses due to defects and rework are called quality losses and quality stops.
In other words, the lower the native efficiency, the greater the installed cooling capacity. at the terminals of the motor or where an underwater cable starts). The Overall line Efficiency Formula The formula for calculating overall line efficiency Example: Assuming that, Line-1 is making style ABC produces 410 pieces in 8 hours shift day. Dig a little deeper and the picture is less clear. What is the implication of this? Get all latest content delivered straight to your inbox. This means more heat is dissipated from the hydraulic oil and, therefore, hydraulic oil viscosity increases further. And, it makes it easy to track improvements in that process over time. Simply put – it identifies the percentage of manufacturing time that is truly productive. Ninety kW out from 110 kW in is an efficiency of 82%. Sensitivity analysis and measures of change may be helpful. Performance is the ratio of Net Run Time to Run Time. For example: Whereas OEE measures effectiveness based on scheduled hours, TEEP measures effectiveness against calendar hours, i.e. This is the same as taking the ratio of Fully Productive Time (only Good Parts manufactured as fast as possible with no Stop Time) to Net Run Time (all parts manufactured as fast as possible with no stop time). The simplest way to calculate OEE is as the ratio of Fully Productive Time to Planned Production Time. Or is it? Total effective equipment performance (TEEP) is a closely related measure which quantifies OEE against calendar hours rather than only against scheduled operating hours. Using the energy efficiency concept, we can calculate the component and overall efficiency: OverallEfficiency=ElectricalEnergyOutputChemicalEnergyInput Here the electrical energy is given in Wh and Chemical Energy in Btus. Overall efficiency is simply the product of volumetric and mechanical/hydraulic efficiency. Therefore, when it is multiplied by Total Count the result is Net Run Time (the fastest possible time to manufacture the parts). OEE also to some extent assumes a closed system and a potentially static one. The scheduled time = 480 minutes - 30 minutes = 450 minutes. Source: www.accountingtools.com, www.softschools.com, [getWidget results="6" label="recent" type="list"], [getWidget results="6" label="apparel%20news" type="list"]. Please watch the following 4:01 video about overall power plant efficiency: We know what the cumulative efficiency is actually. So the overall efficiency is only 1.5%. It accounts for when the process is running slower than its theoretical top speed (both Small Stops and Slow Cycles). All Rights Reserved. The table below illustrates the calculation of overall efficiency of a light bulb. This returned fuel consumption to the original level, but no significant improvement was seen. He has worked 480 minutes. The reason for identifying the losses in these categories is so that specific countermeasures can be applied to reduce the loss and improve the overall OEE. Quadrants of the Power Efficiency Diamond of a hydraulic machine are all interrelated. The Pennsylvania State University © 2020, Cumulative Efficiency of Coal Power Plant, Energy Conservation and Environmental Protection, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, Department of Energy and Mineral Engineering, Department of Materials Science and Engineering, Department of Meteorology and Atmospheric Science, Earth and Environmental Systems Institute, iMPS in Renewable Energy and Sustainability Policy Program Office, BA in Energy and Sustainability Policy Program Office, 2217 Earth and Engineering Sciences Building, University Park, Pennsylvania 16802. © 2020 Endeavor Business Media, LLC. A mechanical/hydraulic efficiency of 100% would mean if the pump was delivering flow at zero pressure, no force or torque would be required to drive it. Example: 18,848 widgets / 19,271 widgets = 0.9780 (97.80%).