The testing procedure shown below intended to test the thermal conductivity of a

Question

The testing procedure shown below intended to test the thermal conductivity of a certain type of copper material. The 0.5 in OD Copper tube is to be set inside of a hot bath of water, and cold water is to be steadily flowing through the system. Answer the following questions regarding best solutions for this setup 1) What are the parts required to fit the 0.5 in copper tube inside the tank at the inlet at point C and the outlet at point D? 2) What are the parts required to fit the other pipes outside of the Hot bath at points C·D, E and F? 3) How can you set up a thermocouple to measure the temperature of the outlet water of the hot bath at point D? 4) Similar to (3), how can you set up a thermocouple to measure the inlet temperature into the hot bath at point C 5) If the 0.5in Copper tube was embossed into ellipsoidal cross sectional shape, how would it then be fitted properly at points C and D? Would vinyl reinforced piping be helpful to connect the Copper tube piece inside to points C and D? Water tank container Water Source for the 0.5" copper tube Hot bath D E Flow Meter Lower Temp) Centrifugal Pump

Explanation / Answer

1) A sweepolet maybe used as the main attachemnt compunded with a union or a compression coupling, a sealant maybe used for proper insulation

2) A weldolet maybe used as the main attachemnt compunded with a union or a compression coupling, a sealant maybe used for proper insulation

3) Since the temperature ranges are going to be small in the case as water is the hot junction, and accuracy is key in the exeriment, a Type K Thermocouple will be suitable.

A sheathed unit construction might be preffered to protect from evaporative effects.

Since the system is fairly static, and has minimal change of workload the thermocouple can be placed close to the heat source, ie right at the exit of the hot tub D. Hence the temperature changes can be sensed fast.

Since the pipe diameter is failrly low the immersion length parameter is not critical and a fairly good immersion length say, r/2 can be adopted.

4) For the thermocouple at point C all the parameters remian the same except for the immersion lenght.

The immersion lenght will affect the forward flow of the liqud and create wakes in the passage and result in an disturbed flow. Hence the bead size and the immersion lenght should be kept at a minimum as the incoming fluid will have homogenoius temoerature and boudary effects can be neglected.

5) for ellipitcal cross section, the shape of the fittings needs to be changed. Vinyl reinforced piping can also be helpful in sealing

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