Category Archive for: «Energy Efficency»

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14 energy-efficiency improvement opportunities in pumping systems

Detailed energy assessment Pump systems consist of pumps, driver, pipe installation and controls (such as ASDs or throttles) and are a part of the overall motor system. Below some of the energy efficiency opportunities for the pumping system are presented. Also, American Society of Mechanical Engineers (ASME) has published a standard that covers the assessment […]

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Energy Efficiency Aspects of Electric Motors

Load Efficiency Three-phase squirrel-cage induction motors comprise a considerable percentage of the electrical load in the United States. Design, operation, and maintenance of these machines is well described in some of the articles already published. This technical article focuses on their energy efficiency aspects. Induction motors typically range in full load efficiency from about 87% […]

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8 Energy-Efficiency Improvement Opportunities In Electric Motors

Energy Saving Opportunities When considering energy-efficiency improvements to a facility’s motor systems, a systems approach incorporating pumps, compressors, and fans must be used in order to attain optimal savings and performance. In the following, considerations with respect to energy use and energy saving opportunities for a motor system are presented and in some cases illustrated […]

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An example of calculating the number of indoor lighting fixtures

Input information These are the input data for the following calculation: An office area has length: 20 meter; width: 10 meter; height: 3 meter. The ceiling to desk height is 2 meters. The area is to be illuminated to a general level of 250 lux using twin lamp 32 watt CFL luminaires with a SHR […]

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Total Losses in Power Distribution and Transmission Lines (2)

Continued from first part: Total Losses in Power Distribution & Transmission Lines (1) There are two types of transmission and distribution losses: Technical losses (explained in previous part) Non-technical losses (commercial losses) 2. Non-technical (commercial losses) Non-technical losses are at 16.6%, and related to meter reading, defective meter and error in meter reading, billing of […]

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Automatic transfer switch (ATS) between two low-voltage utility supplies

ATS to Emergency / Standby Source Multiple utility services may be used as an emergency or standby source of power. Required is an additional utility service from a separate source and the required switching equipment. Figure 1 shows automatic transfer between two low-voltage utility supplies. Utility source 1 is the normal power line and utility […]

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Electrical Thumb Rules You MUST Follow (Part 3)

Continued from second part: Electrical Thumb Rules You MUST Follow (Part 2) Size of Capacitor for Power Factor Correction For Motor Size of Capacitor = 1/3 Hp of Motor ( 0.12x KW of Motor) For Transformer < 315 KVA 5% of KVA Rating 315 KVA to 1000 KVA 6% of KVA Rating >1000 KVA 8% […]

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Electrical Thumb Rules You MUST Follow (Part 2)

Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) Useful Electrical Equations For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 For Sinusoidal Current: Peak Factor = Max Value/RMS Value = 1.414 Average Value of Sinusoidal Current (Iav) = 0.637 x Im (Im = Max.Value) RMS Value of Sinusoidal Current […]

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What is the rewind scenario if a motor fails?

Increasing Motor Efficency Unlike an initial motor purchase where your decision is limited to procuring a standard versus a premium efficiency motor, a motor failure or burnout produces three alternatives. Your options are to rewind the failed motor, purchase a new standard-efficiency motor, or purchase an energy-efficient replacement motor. For this scenario, motor installation labor […]

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How to calculate voltage regulation of distribution line

Content Introduction to voltage regulation Voltage Regulation for 11KV, 22KV, 33KV Overhead Line Permissible Voltage Regulation (As per REC) Voltage Regulation Values Required Size of Capacitor Optimum location of capacitors Voltage Rise due to Capacitor installation Calculate % Voltage Regulation of Distribution Line Introduction to voltage regulation Voltage (load) regulation is to maintain a fixed […]

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