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

Evaluating Temperature Data Evaluating Temperature Data Bh. . Subramanyam Subramanyam ( (Subi Subi) ) Bh 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- -532 532- -4092 4092 Tel: 785 Fax: 785- -532 532- -7010 7010 Fax: 785 E- -mail: mail: bhs bhs@wheat. @wheat.ksu ksu. .edu edu E 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- -time reading time reading Gives real

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 treatment in t in Maximum temperature attained at floor level during heat treatmen August, 1999 August, 1999 N> Floor 4 85°C 80°C 75°C 70°C Floor 3 65°C 60°C 55°C Floor 2 50°C 45°C 40°C Floor 1

The length of time floor temperatures were above 50°C during a heat eat The length of time floor temperatures were above 50°C during a h treatment in August, 1999 treatment in August, 1999 N> Floor 4 40 hours 30 hours Floor 3 20 hours 10 hours Floor 2 5 hours Floor 1

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

Observed and fitted lines to Observed and fitted lines to 70 Basement Temperature 60 temperature and RH data temperature and RH data 50 y =33.4+33.3(1-1/(1+33.3*0.008 x )); r 2 =0.99 40 Relative humidity y =19.1+13.3 exp(- x /2.35)); r 2 =0.88 30 Observed temperature Temperature ( o C) or Relative humidity (%) 20 Predicted temperature Observed RH 10 Predicted RH 70 2 nd floor 1 st floor 60 50 y =31.4+33.5(1-1/(1+33.5*0.011 x )); r 2 =0.95 y =31.9+32.1(1-1/(1+32.1*0.013 x )); r 2 =0.90 40 y =18.9+13.8 exp(- x /2.90)); r 2 = 0.84 30 y =19.9+11.9 exp(- x /2.47)); r 2 =0.74 20 10 70 3 rd floor 4 th floor 60 50 y =31.8+31.8(1-1/(1+31.8*0.011 x )); r 2 =0.93 y =31.1+28.8(1-1/(1+28.8*0.007 x )); r 2 =0.95 40 30 y =19.9+11.3 exp(- x /2.77)); r 2 =0.75 y =19.4+16.8 exp(- x /4.6)); r 2 =0.87 20 10 0 4 8 12 16 20 24 28 32 36 0 4 8 12 16 20 24 28 32 36 Time (hours)

August 4- -6 gas heat treatment 6 gas heat treatment August 4 Feed mill, KSU Feed mill, KSU Location Hours to Hours above Maximum Location Hours to Hours above Maximum reach 50 o C 50 o C temperature reach 50 o C 50 o C temperature ( o C) ( o C) Basement Basement 4- 4 -4.3 4.3 31.7- 31.7 -32 32 71.7 71.7 st floor 1 st floor 1.5- -3.2 3.2 32.8- -34.5 34.5 63.9 1 1.5 32.8 63.9 nd floor 2 nd floor 2.1- -2.4 2.4 33.6- -33.9 33.9 70.7 2 2.1 33.6 70.7 rd floor 3 rd floor 3.1- -3.4 3.4 32.6- -32.9 32.9 70 3 3.1 32.6 70 th floor 4 th floor 7.2- -8 8 28- -28.8 28.8 64.4 4 7.2 28 64.4 Warehouse 1.3- -2.3 2.3 33.7- -34.7 34.7 65.6 Warehouse 1.3 33.7 65.6 o C. Outside: 22.2 o C. Mill: 28.3 o C. Heater discharge: 62.8- -104.4 104.4 o C. Outside: 22.2- -24.4 24.4 o C. Mill: 28.3- -30.6 30.6 o C. Heater discharge: 62.8

Bottomline Bottomline • Heat works! Heat works! • • Minimum temperature, 50 Minimum temperature, 50 o C or 122 o F • o C or 122 o 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 –