Glycerin (cp=2400J/kgK) at 20oC and 0.5kg/s is heated by ethylene glycol (cp=2500J/kgK at 50oC at the same mass flow rate. The overall heat transfer coefficient for this thin-walled double-pipe parallel flow heat exchanger is 380W/m2K and the heat transfer surface area is 6.5m2. Determine Cmin and Cmax Find c, e, and NTU

I am reviewing methods of assessing systems in heat transfer. One of the method I have run across for looking at single pass heat exchangers is log mean temperature difference (LMTD). What is the advantage of using LMTD instead of the basic/arithmetic difference in temperatures?

Water must be heated from 15 to 50°C in a simple double-pipe heat exchanger at a rate of 3,500 kg/h. The water is flowing inside the inner tube with steam condensing at 110°C on the outside. The tube wall is so thin that the wall resistance may be neglected. Assume that the steam-film coefficient h_0 is 11 kW/m^2 °C. What is the length of the shortest heat exchanger that will heat the water to the desired temperature, considering an optimal diameter for the tube? Checking several table values, the following properties of water for this scenario are: p = 993 kg/m^3 k = 0.61 W/m °C \mu (viscosity) = 0.78 cP Cp = 4.19 J/g °C

Glycerin (cp=2400J/kgK) at 20oC and 0.5kg/s is heated by ethylene glycol (cp=2500J/kgK at 50oC at the same mass flow rate. The overall heat transfer coefficient for this thin-walled double-pipe parallel flow heat exchanger is 380W/m2K and the heat transfer surface area is 6.5m2. Determine Cmin and Cmax Find c, e, and NTU Determine heat transfer rate for the heat exchanger. Determine the outlet temperatures of both fluids.