Evaluating Temperature Data Evaluating Temperature Data Bh. . - - PowerPoint PPT Presentation

Evaluating Temperature Data Evaluating Temperature Data

Bh Bh. . Subramanyam Subramanyam ( (Subi Subi) ) Department of Grain Science and Industry Department of Grain Science and Industry Kansas State University Kansas State University Manhattan, KS 66506 Manhattan, KS 66506 Tel: 785 Tel: 785-

• 532

532-

• 4092

4092 Fax: 785 Fax: 785-

• 532

532-

• 7010

7010 E E-

• mail:

mail: bhs bhs@wheat. @wheat.ksu ksu. .edu edu May 15, 2004 Heat Treatment Workshop May 15, 2004 Heat Treatment Workshop

Importance of Measuring Temperatures Importance of Measuring Temperatures

• Determine rate of heating

Determine rate of heating

• Determine uniformity of heating

Determine uniformity of heating

– – Take corrective action Take corrective action – – Regulate heat input and distribution Regulate heat input and distribution

• Determine rate of cool down

Determine rate of cool down

• Determine if minimum temperature

Determine if minimum temperature-

• time

time combinations have been attained to kill insect combinations have been attained to kill insect species and stages species and stages

• Protect heat sensitive equipment

Protect heat sensitive equipment

• Estimate heat treatment costs

Estimate heat treatment costs

Measurement Devices Measurement Devices

Temperature recorder Temperature recorder Data logger Data logger Thermocouples Thermocouples Gives real Gives real-

• time reading

time reading

Microprocessor based data logger Microprocessor based data logger Records temperature and relative humidity Records temperature and relative humidity Launched and read by computer Launched and read by computer Gives readings after heat treatment Gives readings after heat treatment

Boxcar Pro Software Boxcar Pro Software

Infrared ray gun Infrared ray gun Gives surface temperatures Gives surface temperatures Should be calibrated Should be calibrated

Batteries should be protected from heat Batteries should be protected from heat

Maximum temperature attained at floor level during heat treatmen Maximum temperature attained at floor level during heat treatment in t in August, 1999 August, 1999

40°C 45°C 50°C 55°C 60°C 65°C 70°C 75°C 80°C 85°C Floor 1 Floor 4 Floor 3 Floor 2

N>

The length of time floor temperatures were above 50°C during a h The length of time floor temperatures were above 50°C during a heat eat treatment in August, 1999 treatment in August, 1999

5 hours 10 hours 20 hours 30 hours 40 hours Floor 1 Floor 2 Floor 3 Floor 4

N>

Wireless Devices Wireless Devices

• Radio frequency

Radio frequency

• Transmitter

Transmitter

• Receiver

Receiver

• Gives real time reading

Gives real time reading

Thermal Imager Thermal Imager

Surface temperature vs radiant energy

Basement

10 20 30 40 50 60 70 y=19.1+13.3 exp(-x/2.35)); r2=0.88

1st floor

Time (hours) Temperature (oC) or Relative humidity (%)

10 20 30 40 50 60 70

Observed temperature Predicted temperature Observed RH Predicted RH

y=31.4+33.5(1-1/(1+33.5*0.011x)); r2=0.95 y=33.4+33.3(1-1/(1+33.3*0.008x)); r2=0.99 y=19.9+11.9 exp(-x/2.47)); r2=0.74

2nd floor 3rd floor

4 8 12 16 20 24 28 32 36 10 20 30 40 50 60 70

4th floor

4 8 12 16 20 24 28 32 36 y=31.9+32.1(1-1/(1+32.1*0.013x)); r2=0.90 y=18.9+13.8 exp(-x/2.90)); r2= 0.84 y=31.8+31.8(1-1/(1+31.8*0.011x)); r2=0.93 y=19.9+11.3 exp(-x/2.77)); r2=0.75 y=31.1+28.8(1-1/(1+28.8*0.007x)); r2=0.95 y=19.4+16.8 exp(-x/4.6)); r2=0.87

Relative humidity Temperature

Observed and fitted lines to Observed and fitted lines to temperature and RH data temperature and RH data

August 4 August 4-

• 6 gas heat treatment

6 gas heat treatment Feed mill, KSU Feed mill, KSU

Location Location Hours to Hours to reach 50 reach 50o

• C

C Hours above Hours above 50 50o

• C

C Maximum Maximum temperature temperature ( (o

• C)

C)

Basement Basement 4 4-

• 4.3

4.3 31.7 31.7-

• 32

32 71.7 71.7 1 1st

st floor

floor 1.5 1.5-

• 3.2

3.2 32.8 32.8-

• 34.5

34.5 63.9 63.9 2 2nd

nd floor

floor 2.1 2.1-

• 2.4

2.4 33.6 33.6-

• 33.9

33.9 70.7 70.7 3 3rd

rd floor

floor 3.1 3.1-

• 3.4

3.4 32.6 32.6-

• 32.9

32.9 70 70 4 4th

th floor

floor 7.2 7.2-

• 8

8 28 28-

• 28.8

28.8 64.4 64.4 Warehouse Warehouse 1.3 1.3-

• 2.3

2.3 33.7 33.7-

• 34.7

34.7 65.6 65.6

Heater discharge: 62.8 Heater discharge: 62.8-

• 104.4

104.4o

• C. Outside: 22.2
• C. Outside: 22.2-
• 24.4

24.4o

• C. Mill: 28.3
• C. Mill: 28.3-
• 30.6

30.6o

• C.

C.

Bottomline Bottomline

• Heat works!

Heat works!

• Minimum temperature, 50

Minimum temperature, 50o

• C or 122

C or 122o

• F

F

• Time, variable

Time, variable

– – Time of year (winter Time of year (winter vs vs summer) summer) – – Spot or whole building Spot or whole building – – Insect species and stage Insect species and stage