![]() These requirements can drive up the facility’s infrastructure cost for one-time design-validation measurements, this cost is difficult to justify. The infrastructure therefore should comprise a suitably rated source and an equivalent load that can support the rating of the power-electronics system you are evaluating. However, measuring the efficiency of a high-power system that delivers power to loads such as motors, generators, or industrial-computer equipment requires a source that delivers the rated power. In other words, the measured input power is equal to the output power plus the power loss of the system. The power electronics system operates at the rated output-power level, and, by measuring the input power and output power, you can calculate the systems efficiency using the equation η=(POUT/PIN)×100%, where POUT is output power and PIN is input power. Figure 1 shows the conventional method of performing efficiency measurement. Neither the U.S. Department of Energy nor Pacific Northwest National Laboratory is responsible for any adverse outcome associated with results generated by the RTUCC.Validating the system efficiency of a power-electronics circuit is essential in evaluating the overall system performance, design optimization, and sizing of cooling systems. Actual performance and costs will vary depending on specific operating conditions. The RTUCC is not designed to replace custom building load simulation software for heating and cooling systems design. It provides energy and cost estimates suitable for comparison purposes only. The RTUCC is a screening tool that estimates a product's lifetime energy cost savings at various efficiency levels. Due to the dynamic nature of building heating and cooling, actual energy use will vary depending on the application. The RTUCC was not designed to replace custom building load simulation software for heating and cooling systems design. The calculator provides energy and cost estimates suitable for comparison purposes. The results obtained with the RTUCC will be useful to facility managers, financial officers, energy management professionals, air conditioning contractors, and other decision makers interested in maximizing both the energy efficiency and cost-effectiveness of cooling system investments. ![]()
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