World Library  
Flag as Inappropriate
Email this Article

Load factor (electrical)

Article Id: WHEBN0018254249
Reproduction Date:

Title: Load factor (electrical)  
Author: World Heritage Encyclopedia
Language: English
Subject: Utilization factor, Demand factor, Load profile, Ice storage air conditioning, Glendoe Hydro Scheme
Collection: Power Engineering
Publisher: World Heritage Encyclopedia

Load factor (electrical)

In electrical engineering the load factor is defined as the average load divided by the peak load in a specified time period.[1]

f_{Load} = \frac{\text{Average load}}{ \text{Maximum load in given time period}}

Typical example of a large commercial electrical bill: kW Demand = 436 kW; kWh Use = 57,200 kWh; Number of days in billing cycle = 30d

Load Factor [%] = (57,200 kWh / (30 days X 24 hours per day)) / 436 kW X 100% = 18.22%

It can be derived from the load profile of the specific device or system of devices. Its value is always less than one because maximum demand is always higher than average demand, since facilities likely never operate at full capacity for the duration of an entire 24 hour day. A high load factor means power usage is relatively constant. Low load factor shows that occasionally a high demand is set. To service that peak, capacity is sitting idle for long periods, thereby imposing higher costs on the system. Electrical rates are designed so that customers with high load factor are charged less overall per kWh. This process along with others is called load balancing or peak shaving.

The load factor is closely related to and often confused with the demand factor.

f_{Demand} = \frac{ \text{Maximum load in given time period}}{\text{Maximum possible load}}

The major difference to note is that the denominator in the demand factor is fixed depending on the system. Because of this, the demand factor cannot be derived from the load profile but needs the addition of the full load of the system in question.

See also


  1. ^
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.