Baseline design of a sorption-based Joule-Thomson cooler chain for the METIS instrument in the E-ELT

Performance comparison of sorption compressors for methane using metal-organic frameworks and activated carbon as adsorbents

“…If we take the gas remaining in the cell and the discharged gas as a closed system, then this system undergoes an isobaric process. The sensible heat for free gas during the discharge phase can be calculated by, dq fre,sen | B→C = dh fre = x fre (T, p)| B→C c p,fre (T, p)dT (11) where dh fre is the change in enthalpy, c p,fre is the specific heat capacity at constant pressure of free gas, and x fre | B→C is the normalized mass including both free gas in the sorption cell and the discharged gas, calculated as,…”

“…However, due to the limited adsorption characteristics of these two adsorbents, research on sorption compressors had been stagnant for years. Presently, the physisorption compressors mainly use activated carbon as adsorbents [7], whereas helium-3 [8], helium-4 [9], hydrogen [10], neon [11], nitrogen [12], argon [13], oxygen [13], methane [14], krypton [15], xenon [16], ethylene [17], gas mixture of nitrogen and hydrocarbons [18] are used as working fluids. However, it is found that due to the low adsorption capacities of activated carbons at room temperature, they often need to be precooled below ambient temperature to obtain considerable adsorption capacities, which will increase the complexity of sorption compressors.…”

Treatment of RO Rejects Wastewater by Integrated Coagulation Cum Adsorption Process

“…The adsorption process for 135 NTU and the Table 4 showed that the Thomson rate constant K TH was 0.072 ml/min.mg for 6cm and it decreased to 0.009 ml/min.mg [36]. The adsorption efficiency for 6cm, the column was 11.50 mg/g and for 12 cm it increased to17.17 mg/g [37]. The regression coefficient of 6cm was 0.954 and for 12 cm the correlation was 0.929 which showed compatible correlation.…”

Development of a switchless sorption compressor for the cryogenic refrigeration within the METIS instrument: Part I. Theoretical design

“…In order to compare the performance and size of the METIS refrigerator with and without GGHS, a 1-dimensional dynamic model (Wu et al, 2017a) was adapted to evaluate the dynamics in the sorption compressor-cell. According to the baseline design of the METIS cooler chain (Wu et al, 2017b), the operation condition of the sorption compressors have been determined. Table 1 lists the required mass flow rate ( m), the high and low pressures (ph and pl), the high temperature (Th, i.e.…”

“…Based on such specifications, vibration-free Joule-Thomson (JT) refrigerator based on sorption technology was proposed by University of Twente to serve the METIS instrument (Wu et al, 2013). In a previous study (Wu et al, 2017b), a baseline design of the refrigerator chain for METIS has been developed. Such conceptual design consists of three refrigerator stages thermally linked in parallel, providing refrigeration at 8 K (helium), 25 K (hydrogen) and 40 K (neon), respectively.…”