Chemical and adsorption heat pumps: Comments on the second law efficiency

Adsorption and catalysis for sustainable energy applications

“…(3)-(5) and by Eq. (6) are equiv alent, as demonstrated in [22,23]. Other important TEC parameters are the specific conversion density G = ΔQ use /V or G = ΔQ use /m (7) and the specific conversion power W = 1/V(dΔQ use /dt) or W = 1/m (dΔQ use /dt), (8) where V is the TEC unit volume and m is the mass of catalyst/adsorbent.…”

“…This class of gas-solid reactions is charac terized, according to the Gibbs phase rule, by a mono variant equilibrium, which means that, at a fixed pres sure Р of the gas component, the complete conversion of the reagents into products occurs directly at the temperature Т*. An important advantage of a mono variant system is that its TEC efficiency can reach the Carnot efficiency (see [23] and below).…”

Experimental study and comparison of thermochemical resorption refrigeration cycle and adsorption refrigeration cycle

“…Without taking into account the sensible heats of the sorbents, the refrigerant, the heat transfer fluid and the metallic parts of the reactors, the maximum theoretical COP of the resorption refrigeration cycle and the adsorption refrigeration cycle can be assessed in terms of the reaction enthalpies of the sorbents and the refrigerant (Sharonov and Aristov, 2008). The maximum theoretical COP assessed for the resorption refrigeration cycle and adsorption refrigeration cycle were 0.78 and 0.46, respectively, showing that the former cycle has a higher theoretical COP than the latter cycle.…”

Advances in Organic Liquid‐Gas Chemical Heat Pumps

“…In a closed-loop system, the relationship between temperature and pressure at the equilibrium state can be described by the Clausium-Clapeyron equation [9,10]:…”