Determine the outlet temperature of the water

Determine the length of the heat exchanger

What are the heat transfer mechanisms involved during heat transfer from the hot to the cold fluid?

Is the approximation hi = ho = h for the convection heat transfer coefficient in a heat exchanger a reasonable one when the thickness of the tube wall is negligible?

A double-pipe counter-flow heat exchanger is to cool ethylene glycol (Cp = 2560 J/kg · °C) flowing at a rate of 3.5 kg/s from 80°C to 40°C by water (Cp = 4180 J/kg · °C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m2 · °C. Determine the rate of heat transfer.

A double-pipe counter-flow heat exchanger is to cool ethylene glycol (Cp = 2560 J/kg · °C) flowing at a rate of 3.5 kg/s from 80°C to 40°C by water (Cp = 4180 J/kg · °C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m2 · °C. Determine the mass flow rate of water.

A double-pipe counter-flow heat exchanger is to cool ethylene glycol (Cp = 2560 J/kg · °C) flowing at a rate of 3.5 kg/s from 80°C to 40°C by water (Cp = 4180 J/kg · °C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m2 · °C. Determine the heat transfer surface area using LMTD method.

A heat exchanger is used to condense steam coming off the turbine of a steam power plant by cold water from a nearby lake. The cold water (cp = 4.18 kJ/kg⋅ºC) enters the condenser at 16ºC at a rate of 20 kg/s and leaves at 25ºC while the steam condenses at 45ºC (h_fg=2395 kJ/kg). The condenser is not insulated and it is estimated that heat at a rate of 8 kW is lost from the condenser to the surrounding air. Determine the mass flow rate at which the steam condenses.

A heat exchanger is used to heat cold water(cp=4.18 kJ/kgC) entering at 8°C at a rate of 1.2 kg/s by hot air (cp= 1kJ/kgC) entering at 90°C at rate of 2.5 kg/s. The highest rate of heat transfer in the heat exchanger is:

Cold water (cp = 4.18 kJ/kg⋅ºC) enters a counter-flow heat exchanger at 10ºC at a rate of 0.35 kg/s where it is heated by hot air (cp = 1.0 kJ/kg⋅ºC) that enters the heat exchanger at 50ºC at a rate of 1.9 kg/s and leaves at 25ºC. The effectiveness of this heat exchanger is:

Steam is to be condensed on the shell side of a 2-shell-passes and 8-tube-passes condenser, with 20 tubes in each pass. Cooling water (cp=4.18 kJ/kgC) enters the tubes at a rate of 2 kg/s. If the heat transfer area is 14 m² and the overall heat transfer coefficient is 1800 W/m²·°C, the effectiveness of this condenser is: