Chemical heat pump based on ammonium carbamate (AC) is
a promising
low-grade heat utilization technology. It is essential to know the
chemical equilibrium properties in the application of AC-based technologies.
AC is usually mixed with solvents to realize circulation. However,
the existing studies mainly focus on AC in the solid phase. Therefore,
the influence of solvents on the chemical equilibrium of AC was experimentally
investigated in this work. The results confirm the solvent effect
on the equilibrium pressure of AC in the range of 10∼90 °C.
For solvents capable of dissolving AC, the equilibrium pressure increases
with both AC concentration and temperature. The solvent effect is
mainly due to the influence on both the reaction enthalpy and entropy
change terms. An equilibrium pressure–temperature–concentration
relationship of AC solution is established. These results provide
essential parameters for the design and operation of low-grade heat
management and utilization systems based on AC.
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