Serialnumberof panels
Ooka・Kikumoto Laboratory大岡・菊本研究室
Effect of insulation on indoor thermal comfort in a detached house with a floor heating system
Effect of insulation on indoor thermal comfort in a detached house with a floor heating system
1Background objective
• Vertical air temperaturegradient
• Cold draft• Local discomfort• Dust transport, indoor air
quality
Study on floor heating system ObjectiveIn a floor heating environment, the
relationship between thermal insulation
and thermal comfort？
Insulation performance
• Unnecessary heat loss andacquisition reduction
• Reduction of energy
required for air conditioning• Extended period without air
conditioning
2 Methodology (Simulation)• Simulation is a method of modeling and analyzing complex problems for real systems
using a computer
• A simulation was performed for a typical Japanese detached house by changing the
thickness t of the heat insulating material introduced to the ceiling / exterior wall / floor
• Heating period: Jan. to Feb., Nov. to Dec. Calculation step: 1 hour
3 Results・Mean air temperature• Compared with no insulation(case 0), MAT
was higher when there was insulation
• MAT rises as more insulation is introduced
• Increment of MAT was not linear
• The thicker the insulation, the smaller the
MAT increment with the previous case
4 Results・Floor temperature• Floor temperature was consistent with the change in
solar radiation
• Floor temperature increased compared to the condition
without insulation
• Floor temperature increased as the insulation thickness
was changed
5 Results・PMV/PPD
Warm Neutral Cool
• Predicted mean vote (PMV)
Indicator of thermal sensation felt by humans
• Predicted Percentage of Dissatisfied (PPD), Percentage of
people who feel dissatisfied or uncomfortable with their thermal
environment
• Case 0 without insulation had the lowest PMV and highest PPD
• The thicker the insulation, the higher the PMV value in all
rooms and the lower the PPD at the same time
• The increase and decrease of PMV and PPD became smaller
than the previous case
t=0mm t=50mm t=100mm t=150mm
25.1
19.519.4
13.6
11.211.4 11.4
9.29.3 9.38.48.5
Living Room
Bedroom
Children’s room (I)
Average result for each room of PPD (%)
Room
Mean air temperature Case 1 and
case 0
increment(℃)
Case 2 and
case 0
increment(℃)
Case 3 and
case 0
increment(℃)
Case 0 Case 1 Case 2 Case 3
断熱材0 mm
断熱材50 mm
断熱材100 mm
断熱材150 mm
Living Room 17.0 18.3 19.2 20.0 1.3 2.2 3.0
Bedroom 16.9 18.7 19.7 20.3 1.8 2.8 3.4
Children’s room I
17.0 18.7 19.6 20.3 1.7 2.6 3.3
Children’s room II
17.8 20.0 21.3 22.2 2.2 3.5 4.4
Floor temperature distribution in children’s room (II)
Warm +2 Slightly warm +1
Neutral 0
Cool -1 Cold -2
-0.1 0.1 0.3-0.5
Insulation thickness0 mm
Insulation thickness
150 mm
Insulation thickness 50mm
Insulation thickness100 mm
Average result of PMV in children’s room (II)
6 Conclusion• In a floor heating environment, thermal comfort can be
improved by increasing the thickness of the insulation material to some extent
17.518.018.519.019.520.020.521.021.522.022.523.023.5
0:00 12:00 0:00 12:00 0:00 12:00 0:00 12:00 0:00 12:00 0:00 12:00 0:00 12:00 0:00
断熱材 0 mm 断熱材 50 mm 断熱材 100 mm 断熱材 150 mm
