You are working as an engineer a company. During an energy audit, you realize that your company has a 40 kw transformer that is connected all the time. While inspecting the transformer, you calculate the core losses from the device to be approximately 5% of its rated capacity. Assume that the electrical costs are 10 C/kWh and 10 USD/KW/month of peak demand, that the average building use is 12 h/month, and that the average month has 720 hours. Estimate the annual cost savings from installing a switch that would energize the transformer only when the building was being used. The transformer is used h/month, and it can be turned off for the remaining of the month. That is h/month. That means the transformer can be turned off for h/year. The core losses from the tansformer is kW. Installing a switch to turn on the transformer only when the building is used results: Annual energy savings of kWh/year. Annual cost savings of USD/year. Does it make sense to use this strategy?

You are working as an engineer a company. During an energy audit, you realize that your company has a 40 kw transformer that is connected all the time. While inspecting the transformer, you calculate the core losses from the device to be approximately 5% of its rated capacity. Assume that the electrical costs are 10 C/kWh and 10 USD/KW/month of peak demand, that the average building use is 12 h/month, and that the average month has 720 hours. Estimate the annual cost savings from installing a switch that would energize the transformer only when the building was being used. The transformer is used h/month, and it can be turned off for the remaining of the month. That is h/month. That means the transformer can be turned off for h/year. The core losses from the tansformer is kW. Installing a switch to turn on the transformer only when the building is used results: Annual energy savings of kWh/year. Annual cost savings of USD/year. Does it make sense to use this strategy?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.57P: A two-winding single-phase transformer rated 60kVA,240/1200V,60Hz, has an efficiency of 0.96 when...

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