Manual of Method for Calculating Primary Energy Consumptions under 2016 Building Energy Code (Non-residential Buildings)

National Institute for Land and Infrastructure Management (NILIM), Ministry of Land, Infrastructure and Building Research Institute (BRI), Transport and Tourism, National Research and Development Agency

9. Method for Calculating Other Primary Energy Consumption

This chapter shows the logic for calculating primary energy consumptions of other.

Table 1. Input
Variable name	Description	Unit	Reference
\(ROOMTYPE_{M,r}\)	Building and room uses of room r to be calculated	-	Form 1: ① Building and room uses
\(A_{M,r}\)	Floor area of room r to be calculated	m²	Form 1: ① Room Area
\(n_\{M}\)	Number of rooms to be calculated	-	Form 1: ① Number of total rows for inputting room names

Table 2. Output
Variable Name	Description	Unit	References
\(E_\{M}\)	Other primary energy consumption	MJ/year

Calculate a primary energy consumption of other from the following formula.

\[E_\{M} = \sum_{r=1}^{n_\{M}} (a_{M,r} \times A_{M,r} )\]

A coefficient \(a_{M,r}\) [MJ/(m²・year)] is a value specified in Appended Table 2 of MLIT’s 2016 Notification No. 265, and other primary energy consumption.

This coefficient is specified for each room use. Based on Form 1: ① Building and room uses (tem:[ROOMTYPE_{M,r}]) concerning room r to be calculated., an applicable coefficient \(a_{M,r}\) is extracted from Appended Table 2 of MLIT’s 2016 Notification No. 265.

Σ in the formula means the accumulation of primary energy consumptions of all rooms to be calculated in the input sheet. Specifically,the primary energy consumptions of all rooms inputted into “Form 1 Room specifications input sheet” are accumulated.

Where, the coefficient \(a_{M,r}\) is an accumulated annual value of equipment heat generation under the standard room use conditions in each room use that is converted into primary energy. A formula for calculating the value is shown below.

\[a_{M,r} = \sum_{d=1}^{365} \sum_{t=1}^{24} (Q_{app,r,d,t}) \times f_{prime,e} \times 10^{-6}\]

\(Q_{app,r,d,t}\) in the formula is a equipment heat generation [W/m²] at a time t of a date d, and specified for each room use under the standard room use conditions. A equipment heat generation during non-operation hours of air conditioning is expected in some room uses on the assumption of standby energy, but calculation of other energy consumption shall also cover the equipment heat generation during the non-operation hours.
Under the standard room use conditions, an equipment heat generation is always 0 in a room use for non-operation of air conditioning (room use whose standard value for air conditioning equipment is not set), so the coefficient tem:[a_{M,r}] is 0 in the room use for non-operation.