Retrotec USACE - Manual (Page 60)

38 ENERGY & PROCESS ASSESSMENT PROTOCOL
Natural gas rate data ■
Total energy usage (CCF, m ◆ 3 )
Total yearly energy usage (MMBtu, MWh) ◆
Usage cost ( ◆ € , $)
Gas cost ($/MMBtu, $/MWh) ◆
Fuel oil ■
Total energy usage (gal, liters, m ◆ 3 )
Total yearly energy usage (MMBtu, MWh) ◆
Usage cost ( ◆ € , $)
Oil cost ($/MMBtu, $/gal, ◆ € /$/liter)
Water ■
Total water usage (gal, liters, m ◆ 3 )
Usage cost ($, ◆ € )
Water cost ($/gal, ◆ € /$/m 3 )
If hourly power demand data is available from the utility, a quick look at the
power demand variations during a typical summer and winter week will give
an idea of the daytime and nighttime energy profi les. Some typical questions
for the analysis are
What is the difference in daytime power demand in summer and in ■
winter? Is this due to electrical heating or additional lighting?
Does the peak demand occur in summer or in winter? Is it caused by
■
heating or cooling demand?
Is there electric heating or frost protection heating? What is the esti-
■
mated cooling capacity? Do these explain the differences in power
demand?
What is the difference between daytime and nighttime power demand?
■
Or between the operation or production time or off-time demand?
What causes the off-time consumption? Is there some unnecessary
energy use during the night?
How does the power demand vary during the week? What causes the
■
weekend consumption?
How does the power demand vary between peak production time and a
■
more quiet time?
What is the peak demand time (yearly energy consumption kWh divided
■
by peak demand kW)? How does this relate to the working hours in the
facility? If the peak demand time is long and about the same as the hours
of operation, the consumption does not vary much and is caused by a
very constant load. A short peak demand time indicates a high energy
demand occurring at extreme conditions.