What is the difference between btu and kw

This phrase makes sense to Europeans who know a little bit of physics. The base unit of the kilowatt is the watt, named after Scottish inventor James Watt. As is consistent with SI units, the prefix kilo means that one kilowatt equals one thousand watts or one thousand joules per second.

This was first proposed in by Sir Charles William Siemens, an engineer and entrepreneur, who suggested the use of the Watt name as a unit of power. He defined unity within the system of units in use at the time, and his definition was adopted in Current usage: Kilowatts are used worldwide, generally to express the output power of motors and the power of electric motors, tools, machines, and heaters.

The electricity used by a home is generally measured in kilowatt hours, or kWh, meaning 1, watts is applied over a period of one hour.

Nowadays, this method is not applicable because it does not account for the efficiency of each component inside an air conditioner. For example, two air conditioners with the same compressor motor can result in one air conditioner having a higher cooling capacity than the other due to better controls.

We need to compare them using the coefficient of performance COP. Nowadays, people still use horsepower as the indication of air conditioner cooling capacity probably because it is easier for most people to understand.

However, BTU or kW or both are always included in the specification of an air conditioner even though the horsepower is stated. Kilowatt used for the cooling capacity of an air conditioner is derived from the heat transfer equation as follow:. Using kilowatt as the unit of measurement for the cooling capacity of an air conditioner is a convenient indicator of the efficiency of the air conditioner as it is the same unit of measurement as the input electrical power.

The unit of measurement used for the cooling capacity of an air conditioner is based on the preferences and practices of people in a particular region. Some countries prefer to use HP and a few countries used kW to refer to the cooling capacity of an air conditioner. If you are an engineer working in the HVAC industry like me, you definitely have done or will do design calculations. Yu was working in the air conditioning industry for the past 7 years, covering from design to installation and maintenance.

Yu wish to share all the things he learned with the people around the world. As a design engineer, you may come across a situation where you need to choose between a chiller and a VRF system. Among all, water-cooled chillers and air-cooled VRFs are often go head to head. Apart from the electric current, wire sizes are also depending on other conditions such as ambient temperature and voltage drop.

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