Time Dependent Valuation (TDV)
Based on 2022 Building Energy Efficiency Standards, Section 100.2 - Calculation of Time Dependent Valuation (TDV) Energy
Time Dependent Valuation (TDV) energy is a method used to evaluate how efficiently a building uses energy by considering not just the amount of energy used, but also when and where that energy is used.
Imagine two buildings that both use the same amount of electricity over a year. One building uses most of its electricity during the night when demand on the power grid is low, while the other uses most of its electricity during the day when demand is high.
Imagine two buildings that both use the same amount of electricity over a year. One building uses most of its electricity during the night when demand on the power grid is low, while the other uses most of its electricity during the day when demand is high.
Even though they use the same amount of electricity, the second building has a higher impact on the energy grid because it uses energy when it is more valuable and in high demand. TDV helps to capture this difference by assigning different values to energy depending on the time of day, the type of energy used (like electricity or natural gas), and the location of the building (since different areas have different energy demands).
For example, electricity used during peak hours on a hot summer day might be more "costly" in TDV terms than electricity used in the middle of the night because it's harder for the grid to supply that energy during peak demand.
This means a building that uses more energy during peak hours might need to be more efficient overall to meet its energy budget under TDV.
Exam Question:
How does Time Dependent Valuation (TDV) energy account for the value of energy use in building performance evaluation?
A) It measures the total energy used by the building over the entire year without considering when or how the energy is used.
B) It adjusts the energy use by applying multipliers that change depending on the time of day, type of energy used, and the building’s location and type, reflecting the impact of energy use on the grid.
C) It calculates energy use based on the average energy consumption across all hours of the year, without considering specific times or types of energy.
D) It only considers the energy used during peak hours of the year when calculating the building's energy efficiency.
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B) It adjusts the energy use by applying multipliers that change depending on the time of day, type of energy used, and the building’s location and type, reflecting the impact of energy use on the grid.
TDV energy gives more value to energy used when the demand is high and less value when demand is low. For example, energy used during a summer afternoon, when everyone is running air conditioners, is more impactful than energy used late at night. This system ensures that buildings are designed to be efficient not just in total energy use, but in how that energy is used throughout the day and year.
