It is defined as “that condition of mind which expresses satisfaction with the thermal environment”. this condition is also some times called as “neutral condition”, though in a strict sense, they are not necessarily same.
Heating is the major type of energy consumption in colder countries. because of shortage of fossil fuels, efforts are made to find alternative energy sources. therefore heat pump is an answer to the above problems.
The objective of the study is to come up with techniques that would reduce drag.
drag reduction has a range of positive ramifications like -
1)reduced fuel consumption
2)larger operational range
4)higher achievable speeds
Reliability is essential to the success of wind energy systems and this demands good tribological designs and practice coupled with appropriate condition monitoring. this would also reduce maintenance costs.
A perfect vacuum can be defined as a space with no particles of any state (solid, liquid, gas etc.). practically it is impossible to achieve perfect vacuum. the pressures in vacuum are lower than atmospheric pressures.