I am using the vacuum pump from KNF Neuberger Inc to create a reduced pressure environment for the dryer. I want to calculate the energy consumption of this pump. The pump is removing nitrogen gas from the dryer continuously. The pressure of the system is 500 mbar with a known flow rate (0.6L/min) and temperature (35.31 degree celcius) of nitrogen gas. I know that in order to calculate the energy consumption, I have to include the energy used to remove the nitrogen and the residual solvent. I calculated the energy used to remove the residual by multiplying the enthalphy of vapourization of the solvent with its number of mole of solvent removed. However, I get stuck with calculating the energy consumption to remove the nitrogen gas. Most of the resources are about how to find energy consumption of liquid ring pump and rotary pumps. When I used these resources as a reference, I obtained a very small value for the energy consumed. I don't think that is right.