Determination of adjacent space temperature

Product	InstalSystem 5
Type of article	TIP&TRICK
Source for translation	2026-01-13

Problem description

The temperature of the adjacent space should be taken into account during Thermal calculations of building.
There are several variants to Determine temperature of adjacent space in the program:

• Acc. to standard,
• Acc. to standard Observe Δθ_ij.,
• Acc. to standard Limited to θ_j,u.,
• Acc. to standard Observe Δθ_ij. Limited to θ_j,u.,
• Always adopt design temperature of adjacent space.

θj,u - minimum temperature of the adjacent space equals 16°C by default.

1. Determine temperature of adjacent space.

Note: Calculation variants above do not apply to rooms in a Building unit noted as Temperatures of adjacent spaces equal to design.

Solution

Acc. to standard

The Temperature on other side of the Partition located between rooms from different units is counted as follows:

θ_os = (θ_i,H + θ_m,e) / 2

θ_i,H - Design room temperature,

θ_m,e - Annual mean external temperature.

2. Temperature on other side.

Acc. to standard Observe Δθ_ij.

The Temperature on other side of the Partition located between rooms from different units is counted as follows:

θ_os = (θ_i,H + θ_m,e) / 2

θ_i,H - Design room temperature,
θ_m,e - Annual mean external temperature.

If the calculated θ_os value is higher than the actual design Temperature on other side, the program for this section assumes the actual design temperatures (for both rooms).

Acc. to standard Limited to θ_j,u.

The Temperature on other side of the Partition located between rooms from different units is counted as follows:

θ_os = (θ_i,H + θ_m,e) / 2

θ_i,H - Design room temperature,
θ_m,e - Annual mean external temperature.

If the calculated value of θ_os is lower than the declared value of θj,u, then the program assumes that θj,u is the temperature on the other side.

Acc. to standard Observe Δθ_ij. Limited to θ_j,u.

The Temperature on other side of the Partition located between rooms from different units is counted as follows:

θ_os = (θ_i,H + θ_m,e) / 2

θ_i,H - Design room temperature,
θ_m,e - Annual mean external temperature.

• If the calculated value of θ_os is lower than the declared value of θj,u, then the program assumes that θj,u is the temperature on the other side,
• If the calculated θ_os value, adjusted to reflect the point above, is higher than the actual design Temperature on other side, the program for this section assumes the actual design temperatures (for both rooms).
  

Always adopt design temperature of adjacent space

The program always assumes the actual calculated Temperature on other side.

The option "Temperatures of adjacent spaces equal to design" is chosen

If the option Temperatures of adjacent spaces equal to design is chosen , the program always accepts for the θ_os field the temperature value of the θ_i,H for the Room on the other side.

3. Temperatures of adjacent spaces equal to design.

The field "Room on other side"

There is the possibility to specify the type of the Room on other side:

• %s (room of other building unit),
• %s (room of other building) ,
• %s (room of the same building unit).
  

  

  4. Room on other side.