what are the hot and cold fluids used in shell and tube heat exchangers in natural gas processing?

i need that information to find the heat transfer coefficient. Thanks in advance

The hot fluids could be steam, heat medium fluids, natural gas or propane associated with compression, any of the paraffin series of hydrocarbons, ethylene or triethylene glycol, amines, steam condensate and sulfur. The cold fluids could be any of the paraffin series of hydrocarbons, glycol, natural gas