Electric Motor
Cooling and Ventilation of Electric Motors (IC)
All rotating electrical machines generate heat as a result of the electrical and mechanical losses inside the machine. Losses are high during starting or dynamic braking. Also, losses usually increase with increased loading. Cooling is necessary to continuously transfer the… Read more
Aug 08, 2011 | By Edvard Csanyi
Energy and Power
Resistive heating explained in details
Whenever an electric current flows through a material that has some resistance (i.e., anything but a superconductor), it creates heat. This resistive heating is the result of “friction,” as created by microscopic phenomena such as retarding forces and collisions involving… Read more
Jul 27, 2011 | By Edvard Csanyi
Energy and Power
Who was James Prescott Joule?
James Prescott Joule was born on Christmas Eve 1818 into a wealthy Salford brewing family. A sickly child, he was tutored at home where he indulged his fascination for electricity by using a voltaic cell to give electric shocks to… Read more
Jun 27, 2011 | By Edvard Csanyi
HVAC
District heating – Heat from a central boiler plant
District heating is a system which provides a number of buildings with heat from a central boiler plant through pre-insulated pipes. Pre-insulated pipes are in fact a modern kind of heat culvert or district heating duct, but since these systems… Read more
Mar 03, 2011 | By Edvard Csanyi
Transformers
Transformer Winding Temperature Thermometer
These devices are supposed to indicate hottest spot in the winding based on the manufacturers heat run tests. At best, this device is only accurate at top nameplate rated load and then only if it is not out of calibration…. Read more
Feb 25, 2011 | By Edvard Csanyi
Energy Efficiency
Energy Efficency In Hospitals – Cogeneration (6)
Cogeneration is combined generation of heat and electricity. The advantage of cogeneration is that it enables the heat released by electricity generation to be used. The most well-known form of cogeneration is an electricity generator powered by an internal combustion… Read more
Jan 02, 2011 | By Edvard Csanyi
Energy Efficiency
How To Achieve Energy Efficiency In Hospitals?
The great majority of the energy used within a hospital is purchased from outside in the form of natural gas and electricity. A small proportion is bought in as diesel oil. The energy bought in is converted by a number… Read more
Dec 25, 2010 | By Edvard Csanyi
