Temperature control device and temperature control method
A temperature control device and a temperature control method for use in measuring thermal properties of materials at high and low temperatures are disclosed herein. The temperature control device is configured for controlling a temperature of a test volume inside a test cell and is capable of providing both extremely high and low test volume temperatures over a wide temperature range. The temperature of the test volume is controlled using opposing heating and cooling by controlling a supply of thermal energy to the test cell from a heating subsystem while simultaneously removing thermal energy from the test cell using a cooling subsystem.
1. A temperature control device for use in measuring thermal properties of materials, comprising:
a test cell for receiving a sample to be measured;
a heating subsystem configured to supply thermal energy to the test cell;
a chill cell surrounding at least a portion of the test cell and the heating subsystem;
a thermal break separating the chill cell from the test cell and the heating subsystem, wherein the chill cell is configured to remove thermal energy from the test cell through the thermal break when cooled, and the thermal break is configured to allow a controlled amount of heat transfer between the chill cell and the test cell;
a cooling subsystem configured to cool the chill cell; and
a controller configured to control the heating subsystem to supply thermal energy to the test cell while thermal energy is simultaneously removed from the test cell using the cooling subsystem, to control a temperature of a test volume inside the test cell to a set temperature.
2. The temperature control device of claim 1 , wherein the controller is further configured to control the cooling subsystem for cooling the chill cell.
3. The temperature control device of claim 1 , wherein the cooling subsystem comprises a thermoelectric cooler.
4. The temperature control device of claim 3 , wherein the thermoelectric cooler is mounted to the chill cell via a conductive interface.
5. The temperature control device of claim 1 , wherein the cooling subsystem comprises a liquid nitrogen dewer and a member configured to conduct thermal energy from the chill cell to the liquid nitrogen dewer.
6. The temperature control device of claim 1 , wherein the cooling subsystem comprises a heat exchanger disposed along an internal fluid flow path that is fluidly connectable to an external refrigeration circulator.
7. The temperature control device of claim 1 , wherein the cooling subsystem comprises a refrigeration cycle device.
8. The temperature control device of claim 1 , wherein the heating subsystem comprises an electric resistive heater.
9. The temperature control device of claim 1 , wherein the heating subsystem comprises a thermoelectric heater.
10. The temperature control device of claim 1 , wherein the thermal break comprises a gap filled with air or other gases, a vacuum gap, or is made from a material comprising at least one of ceramics and high-temperature insulative foams.
11. The temperature control device of claim 1 , further comprising insulation surrounding the chill cell.
12. The temperature control device of claim 1 , wherein one side or portion of the test cell and the chill cell are either open or removable to facilitate insertion and removal of the sample to the test cell.
13. The temperature control device of claim 1 , further comprising a temperature sensor disposed within the test cell for measuring a temperature inside of the test cell.
14. The temperature control device of claim 1 , wherein the test cell is configured for receiving a test sensor of a thermal property measurement device.
15. A temperature control method executed at a temperature control device used for measuring thermal properties of materials, comprising:
receiving a set temperature of a test volume inside a test cell for measuring a thermal property of a sample when placed inside of the test cell;
determining a measured temperature of the test volume;
determining a difference between the set temperature and the measured temperature of the test volume; and
while a chill cell surrounding at least a portion of the test cell and separated from the test cell by a thermal break is being cooled by a cooling subsystem to remove thermal energy from the test cell through the thermal break, controlling supply of thermal energy to the test cell from a heating subsystem until the temperature of the test volume is equal to the set temperature, wherein the thermal break is configured to allow a controlled amount of heat transfer between the chill cell and the test cell.
16. The temperature control method of claim 15 , wherein the set temperature is between −150 degrees Celsius and 800 degrees Celsius.
17. The temperature control method of claim 15 , wherein the set temperature is received via user input at a user interface of the temperature control device, or from an external device.
18. The temperature control method of claim 15 , wherein determining the measured temperature of the test volume comprises receiving a temperature measurement from a temperature sensor inside the test cell.
19. The temperature control method of claim 15 , further comprising controlling the cooling subsystem to adjust thermal energy being removed from the test cell via the chill cell.
20. The temperature control device of claim 1 , wherein the chill cell surrounds the test cell and the heating subsystem.