Performance improvement and comparisons of CO2 based adsorption cooling system using modified cycles employing various adsorbents: A comprehensive study of subcritical and transcritical cycles

Experimental Investigation and Thermodynamic Analysis of Coconut-Shell-Derived Activated Carbon for CO2-Based Advanced Adsorption Cooling Systems

“…A maximum COP of 0.130 was achieved for ACs carbonized at 500 °C at an evaporator and generator temperature of 15 and 100 °C, respectively. Various other significant properties of these novel activated carbons are reported elsewhere. , Apart from these novel ACs, there are a few other categories of adsorbents, i.e., grades of porous cross-linked organic polymers (DAT-1 and DAT-2), carbon molecular sieves (VR-5 and VR-93), and specific different grades of MOFs (MOF-200), which are comparable and better than the previously reported adsorbents and have the potential to make a mark in the development of next-generation compact ADCS. , In continuation, in our previous works, , a major emphasis is given to improving the system performance using combined heat and mass recovery schemes clubbed with an ejector and thermoelectric subcooler under subcritical and transcritical operations employing various adsorbents. A maximum COP of 0.301 and 0.353 was attained with Maxsorb III and WPT-AC-500 as the adsorbents under subcritical and transcritical operations, respectively, which is the current benchmark for the CO 2 -based ADCS.…”

“…Various heat interactions during adsorption, preheating, desorption, and precooling undergone by the adsorbent bed packed with CSAC are given by Q 1 ′ → 2 ′ = ∫ T ea T sd [ C p normala + c max C p ref false( T false) ] m a d T Q 2 ′ → 2 ″ = ∫ T sd T ed [ C p a + c false( T , P false) C p ref false( T false) + Q st ∂ c ∂ T …”

“…Various heat interactions during adsorption, preheating, desorption, and precooling undergone by the adsorbent bed packed with CSAC are given by …”

“…The use of CO 2 as the refrigerant in adsorption-based cooling systems (ADCSs) has gathered a significant amount of attention due to its environmentally friendly nature with minimal GWP and ODP and thus, in turn, minimizes the system’s carbon footprints. , CO 2 is nonflammable and less toxic than other natural refrigerants such as NH 3 and methanol. It is compatible with mineral oil, and the usual construction material can be used for it.…”

Performance comparison betweenH2‐metal hydrides andCO2‐adsorbents‐based sorption refrigeration systems

“…The performance of a four‐bed CO 2 VARS with Maxsorb III as adsorbent material is theoretically investigated by Jribi et al 17 and observed the cooling output of 2 kW with a COP of 0.1. An interesting study is carried out by Gautam and Sahoo 18 in the performance investigation of CO 2 VARS with four combinations of heat and mass recovery for five different adsorbents. The study is carried out for (a) normal cycle, (b) with heat recovery, (c) with mass recovery, and (d) with heat‐ mass recovery.…”