: In a heat pump plant air from outside serves as the heat source, where it is cooled from ϑ 2 = 10.0 ◦C to ϑ 2 = 5.0 ◦C, thereby giving heat to a fluid which will be heated from ϑ 1 = −5.0 ◦C to ϑ 1...

: In a heat pump plant air from outside serves as the heat source, where it is cooled from ϑ 2 = 10.0 ◦C to ϑ 2 = 5.0 ◦C, thereby giving heat to a fluid which will be heated from ϑ 1 = −5.0 ◦C to ϑ 1 = 3.0 ◦C. Its mass flow rate is M˙ 1 = 0.125 kg/s, with a mean specific heat capacity cp1 = 3.6 kJ/kgK. For this heat transfer task three flow configurations will be compared: countercurrent, crossflow with one row of tubes and counter crossflow with two rows of tubes and two passageways (running in opposite directions), see Fig. 1.59. The operating characteristic of these configurations can be described by the following cf. [1.16]

Determine the required heat transfer capability kA for the heat exchangers with these three flow configurations.