Seeking help again
Thread Content
! ! ! ! Help! I’m testing shell-and-tube heat exchangers. Based on the measured gas flow rate, water flow rate, as well as the inlet and outlet temperatures of both gas and water, the calculations show that the heat load on the water is higher than that on the gas (theoretically, it should be lower). I don’t know what’s going wrong; please help! ! !
Temperature can be measured quite accurately, but how do you measure gas flow and water flow? It’s hard to measure, right? Moreover, the errors measured are quite large.
The gas flow rate is measured using a vortex flow meter, while the water flow rate is measured using an electromagnetic flow meter. What is generally used to test a manufactured heat exchanger? Seeking help from beginners
Are the gas flow measurement results in standard cubic feet? Is temperature and pressure compensation applied?
It doesn’t have temperature and pressure compensation – is this a big issue?
! ! Additional note: During my tests, the thermal loads of the two fluids were only similar when the gas flow rate was high and the water flow rate was low. In all other cases (high gas flow rate & high water flow rate, low gas flow rate & low water flow rate, low gas flow rate & high water flow rate), the heat load on the water is high. Because in either case, the temperature difference between the inlet and outlet of the gas measured is generally around 12-14 degrees.
There is no phase change in the gas; the temperature at the gas inlet is in the 60s degrees, while it is in the 50s degrees at the outlet