The Full Wiki

More info on Horsepower-hour

Horsepower-hour: Wikis

Advertisements

Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.

Encyclopedia

From Wikipedia, the free encyclopedia

A Horsepower-hour (hph) is an outdated unit of energy, not utilised in the SI system of units. The unit represents an amount of work a horse is supposed capable of delivering during an hour (a horsepower integrated over a time interval of an hour). Based on differences in the definition of what constitutes the 'power of a horse', a horsepower-hour differs slightly from the German "Pferdestärkenstunde" (PSh):

1.014 PSh = 1 hph = 1,980,000 lb·ft = 0.7457 kWh.
1 PSh = 0.73549875 kWh = 2647.7955 kJ (exactly by definition)

The horsepower-hour is still used in the railroad industry when sharing motive power (locomotives.) For example, if railroad A borrows a 2,500 horsepower locomotive from Railroad B and operates it for twelve hours, Railroad A owes a debt of (2,500 * 12) 30,000 horsepower-hours. Railroad A may repay the debt by loaning Railroad B a 3,000 horsepower locomotive for ten hours.[1]

  1. ^ http://www.trains.com/trn/default.aspx?c=a&id=4172

Advertisements






Got something to say? Make a comment.
Your name
Your email address
Message