When performing apples-to-apples energy comparisons, which trio is commonly included?

When performing apples-to-apples energy comparisons, which trio is commonly included?

• A. Oil, natural gas and coal
• B. Electricity, oil and natural gas
• C. Electricity, natural gas and steam
• D. Oil, natural gas and steam

Answer: (B)

Apples-to-apples energy comparisons hinge on converting all energy inputs to a single common unit using energy carriers that are routinely measured in buildings. Electricity, oil, and natural gas are the standard trio because they cover the main energy inputs in most multifamily buildings and data for them are readily available from utility bills or submeters. Each form can be converted to a common unit, like BTUs or MMBtu, so you can sum them to compare overall energy use across buildings. Steam isn’t included because it’s a secondary energy product produced on-site from fuels. Including steam would require extra steps to back out boiler efficiency and the steam's conditions, making the comparison more complex and prone to inconsistencies. Coal is less common in modern multifamily buildings, so it isn’t part of typical benchmarking data. Focusing on electricity, oil, and natural gas provides a practical, consistent basis for apples-to-apples comparisons.

Apples-to-apples energy comparisons hinge on converting all energy inputs to a single common unit using energy carriers that are routinely measured in buildings. Electricity, oil, and natural gas are the standard trio because they cover the main energy inputs in most multifamily buildings and data for them are readily available from utility bills or submeters. Each form can be converted to a common unit, like BTUs or MMBtu, so you can sum them to compare overall energy use across buildings.

Steam isn’t included because it’s a secondary energy product produced on-site from fuels. Including steam would require extra steps to back out boiler efficiency and the steam's conditions, making the comparison more complex and prone to inconsistencies. Coal is less common in modern multifamily buildings, so it isn’t part of typical benchmarking data. Focusing on electricity, oil, and natural gas provides a practical, consistent basis for apples-to-apples comparisons.