A two-stage deep freezing chemisorption cycle driven by low-temperature heat source

Yuanyang HU, Liwei WANG, Lu XU, Ruzhu WANG, Jeremiah KIPLAGAT, Jian WANG

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PDF(241 KB)
Front. Energy ›› 2011, Vol. 5 ›› Issue (3) : 263-269. DOI: 10.1007/s11708-011-0152-z
RESEARCH ARTICLE

A two-stage deep freezing chemisorption cycle driven by low-temperature heat source

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Abstract

A two-stage chemisorption cycle suitable for deep-freezing application driven by low- temperature heat source was proposed. Through two-stage desorption processes, the two-stage cycle can break through the limitations of the heating temperature and ambient cooling temperature. The two-stage cycle based on CaCl2/BaCl2-NH3 working pair can utilize the heat source with a temperature of above 75°C, and simultaneously realize deep-freezing all the year round. Experimental results and performance prediction show that the adsorption quantity of calcium, theoretical coefficient of performance (COP) and optimized specific cooling power (SCP) of the CaCl2/BaCl2-NH3 chemisorption system are 0.489 kg/kg (salt), 0.24 and 120.7 W/kg, when the heating temperature, ambient cooling temperature, pseudo-evaporating temperature and mass ratio of reacting salt and expanded graphite are 85, 30, -20, and 4∶1, respectively.

Keywords

adsorption / freezing / desorption / heat source

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Yuanyang HU, Liwei WANG, Lu XU, Ruzhu WANG, Jeremiah KIPLAGAT, Jian WANG. A two-stage deep freezing chemisorption cycle driven by low-temperature heat source. Front Energ, 2011, 5(3): 263‒269 https://doi.org/10.1007/s11708-011-0152-z

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 50806043) and National 100 Outstanding Ph.D. thesis Foundation in China.
Notations
COPCoefficient of performance
mbaMass of BaCl2/kg
mcaMass of CaCl2/kg
pEquilibrium reacting pressure/Pa
pcCondensing pressure/Pa
peEvaporating pressure/Pa
peqEquilibrium pressure for desorption process between CaCl2 and BaCl2 reactors/Pa
pmEquilibrium pressure for two-stage desorption processes/Pa
SCPSpecific cooling power per kilogram of adsorbent within each adsorber/(W·kg-1)
TTemperature of adsorbent/K(°C)
TaAdsorption temperature/K(°C)
TacAdsorption temperature of chemical adsorbent/K(°C)
TcAmbient cooling temperature, condensing temperature/K(°C)
TePseudo-evaporating temperature/K(°C)
TgDesorption temperature/K(°C)
TgcDesorption temperature of chemical adsorbent/K(°C)
ThHeating temperature/K(°C)
ΔxcaAdsorption quantity of CaCl2/(kg·kg-1)
ΔxbaAdsorption quantity of BaCl2/(kg·kg-1)

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