Reference no: EM133897622

Questions:

1. What is a tariff analysis? Why is a tariff analysis one of the first tasks an energy manager should undertake when looking to reduce energy costs? Some electricity tariffs include a power factor penalty. Why do utilities impose power factor penalties?

2. What is meant by the term 'thermal mass' in relation to buildings? Explain why having large amounts of thermal mass is a necessity in buildings which have been designed to collect direct solar energy? Sketch the typical shape of outdoor and indoor diurnal temperature profiles for a building with a decrement factor (damping ratio) of 0.5 and a time lag of 6 hours.

3. What is the purpose of using chilled water storage or ice storage in air conditioning systems? What would be the advantages and disadvantages of using chilled water storage rather than ice storage in such a system?

4. Why is using a fixed speed motor and a throttling valve to control the water flow in a system not a very energy efficient approach? Why is a variable speed drive a better approach in such situations? What conditions need to exist to make a variable speed drive an economic proposition?

5. In analysing steam systems from an energy point of view it is often recommended that you start at the end use, then consider the distribution system and finally consider the boiler unit. Why is this so? What are some simple examples of energy inefficient practices in steam systems?