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Hotbox Test R-value Database

Retrofit Wall Technology

 

Summary Of Hot Box Test Data And Calculations

tests performed Winter 2002

Wall 1

Base Wall

C-TEMP

weighted average of surface and joint TC's, climate side (°F)

51.4

M-TEMP

weighted average of surface and joint TC's, meter side (°F)

96.8

MA-AIR-T

average of 36 air TC's, meter side(°F)

100.0

C-AIR-T

average of 48 air TC's, climate side(°F)

50.0

M-AIR-VC

air velocity, meter side (MPH)

0.5

C-AIR-VC

air velocity, climate side (MPH)

3.4

TMP-DC (Btu/Hr)

Total measured energy into metering box (Btu/hr)

282.4

∆T

temperature difference across sample wall

45.4

T(mean)

mean temperature across sample wall

74.1

Corrected Qmb

energy exchange through meter box walls (Btu/hr)

4.840

Qwall

calculated energy flow through specimen wall (Qwall - Qsurr)

277.6

Face-To-Face Rwall

surface to surface R-value of wall (hr*ft2*°F/Btu)

10.5

Air-To-Air Ru wall

overall R-value of sample wall (air-to-air), Rms air + Rwall + Rcs air (hr*ft2*°F/Btu)

11.5

Rms air

meter side air film resistance (hr*ft2*°F/Btu)

0.747

Rcs air

climate side air film resistance (hr*ft2*°F/Btu)

0.319

For side by side results click here...

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