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Japanese Commercial & Residential Energy Code and cove.tool
Japanese Commercial & Residential Energy Code and cove.tool

The article lists the input references from Japanese Commercial Energy Codes for energy models located in Japan

Christopher Riddell avatar
Written by Christopher Riddell
Updated over a week ago

Japanese Commercial Energy Code

Engineering Inputs Reference document: RoomUsageCondition_20140303 (Kenken)

The following table shows the exact templates which are being used to automate the chosen engineering inputs:

Following inputs are referenced from the 'RoomUsageCondition_20140303' PDF for different building types (from the table above):

  1. Lighting: The W/m2 value has been used based on the building type.

  2. Appliance Use: The W/m2 value has been used based on the building type.

  3. Occupancy Schedule: The effective hours have been calculated based on 'Human Body Fever Ratio Scale (see attached image).

  4. Total Occupants: Total occupant number has been converted from the person/m2 data present in the table.

  5. People Outdoor Air Rate: The people outdoor air rate has been converted from m3/m2.h.person (table) to L/s/person (app).

  6. Cooling and Heating Setpoints: The cooling setpoint of 26 °C and the heating Setpoint of 22 °C have been used for all building types based on the 'RoomUsageCondition' document.

The following images are from the 'Office' building type:

The HVAC system types for different building types:

The remaining engineering inputs are populated based on ASHRAE Standard 90.1-2019 Energy Standards for Buildings Except Low-Rise Residential Buildings for different building types.

Japanese Residential Energy Code

The wall and roof insulation values are taken from table 1 of BEE Policy for Japan:

HVAC system type for residential homes has been set as 'Single Zone, with Electric Resistance and Packaged DX'. It can be easily changed from the dropdown menu.

Other inputs have been automated from ASHRAE Residential Code 2018.

All inputs can be customized based on the project requirements specific to Japan and saved as a 'Template' for future use.

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