  High cooling power of magnetocaloric refrigeration can be achieved only at
large amounts of heat, which can be transferred in one cycle from cold end to
hot end at quasi-isothermal conditions. The simple experimental method for
direct measurement of the transferred heat from material with magnetocaloric
effect (MCE) to massive nonmagnetic block at quasi-isothermal conditions was
proposed. The vacuum calorimeter was designed for the simultaneous measurements
of MCE both at adiabatic conditions (deltaT) and quasi-isothermal conditions
(deltaQ) in the magnetic fields of Bitter coil magnet. This calorimeter was
tested on samples of pure polycrystalline Gd with direct MCE. The maximal
obtained values were deltaT = 17.7 K and deltaQ = 5900 J/kg at initial
temperature 20 0C in magnetic field 140 kOe.
