# Energy

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Energy
ENERGY MANAGEMENT PRINCIPLES
INTRODUCTION
In the modern days energy has the significant role in our life. With development where we got comfortable life and much modern facilities where we got some problem with excessive use of energy resources as declining of energy sources, climate change. So it is an big challenge for present and future generations as the cost of energy increase and its supply decrease, older buildings needs to modified and new buildings designed to use less energy.
The optimization of heating, ventilation and air conditioning system in term of energy efficiency is part of this assignment as how wisely to manage and use the energy recourses in our daily life and how the technology can help us in minimize the energy use in building sector particularly in HVAC field,

ENERGY CONSUMPTION AND RUNNING COST
In energy consumption Australia is the world’s eighteenth largest energy consumer and ranks fourteenth on per person basis. Building sector is responsible for 19% of total energy consumptions of the country and 23% green house emission (residential 13% commercial 10% ) residential and commercial buildings use the energy for different purposes. Nearly 65% of residential energy consumption use is for heating and cooling. 70% of energy consumption are estimated to contribute to HVAC systems in building sector.
Running cost of all building appliances and systems depends upon the following factors as size of unit, time, load and electricity rate an example of the running cost
If the data sheet has Power Input figure in kW (not the heating or cooling capacity of the unit) you simply multiply this number by your local energy cost in kWh (kilowatt hours) to give you a running cost in cents.
If the input power figure is not given you will need to divide the Cooling Capacity figure by the EER (energy efficient rating) figure and then multiply this by your local energy cost. EER can vary for each machine according to its design and technology

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