  We consider the exactly solvable spin-1/2 $XX$ chain with the three-spin
interactions of the $XZX+YZY$ and $XZY-YZX$ types in an external (transverse)
magnetic field. We calculate the entropy and examine the magnetocaloric effect
for the quantum spin system. We discuss a relation between the cooling/heating
efficiency and the ground-state phase diagram of the quantum spin model. We
also compare ability to cool/heat in the vicinity of the quantum critical and
triple points. Moreover, we examine the magnetocaloric effect for the spin-1/2
$XX$ chain with three-spin interactions in a random (Lorentzian) transverse
magnetic field.
