Enhancement of Condensation Heat Utilization in Chemical Heat Pump Dryer Using Calcium Oxide Reaction

2002 ◽  
Vol 2002.12 (0) ◽  
pp. 445-448
Author(s):  
Hironao OGURA ◽  
Tetsuya YAMAMOTO ◽  
Hiroyuki KAGE
Keyword(s):  
Heat Pump ◽  
Calcium Oxide ◽  
Chemical Heat ◽  
Chemical Heat Pump ◽  
Heat Utilization

scholarly journals Possibility of Calcium Oxide from Natural Limestone Including Impurities for Chemical Heat Pump

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 803
Author(s):  
LanXin Lai ◽  
Toshio Imai ◽  
Motohiro Umezu ◽  
Mamoru Ishii ◽  
Hironao Ogura
Keyword(s):  
Heat Pump ◽  
Calcium Oxide ◽  
Waste Heat ◽  
Heat Pumps ◽  
Raw Material ◽  
Hydration Reaction ◽  
Chemical Heat ◽  
Chemical Heat Pump ◽  
Thermogravimetric Analyzer ◽  
Save Energy

Improving energy recycle is an important way to save energy resources and preserve the global environment. Chemical heat pump (CHP) is a technology for saving energy, which utilizes chemical reactions to store thermal energy such as waste heat and solar heat, then release it to provide heat for heating/cooling/refrigeration. For a practical CHP, it is necessary to find cheaper and more stable supply materials. In order to evaluate the possibility of calcium oxide from natural Ofunato natural limestone including impurities, we compare Ofunato limestone with Kawara natural limestone and Garou natural limestone from Japan. These calcium oxides worked as a reactant for CaO/H2O/Ca(OH)2 CHP by repeated hydration/dehydration reaction cycle experiments in a thermogravimetric analyzer. As a result, Ofunato CaO exhibits a high hydration reaction rate after decarbonization at 1223 K for 5 h. The reactivity increased by the repeated hydration reaction although the first hydration rate was low. Furthermore, the sintering of impurities in Ofunato limestone occur easier than that in Kawara limestone with lower impurities. The impurities adhered to the surface of the CaO particle to make specific surface area of CaO particle smaller, which could inhibit hydration reaction of CaO particle. Even if Ofunato limestone contains some impurities, it can be utilized as a raw material for chemical heat pumps.

Optimum Operating Conditions of a Chemical Heat Pump Using Calcium Oxide/Water Reaction for Effective Utilization of Surplus Electricity.

2003 ◽  
Vol 29 (1) ◽  
pp. 20-26
Author(s):  
Shinji Fujimoto ◽  
Hironao Ogura ◽  
Hirotsugu Iwamoto ◽  
Manabu Abe ◽  
Hiroyuki Kage ◽  
...  
Keyword(s):  
Heat Pump ◽  
Calcium Oxide ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Chemical Heat ◽  
Effective Utilization ◽  
Chemical Heat Pump

Review of Recent Patents on Chemical Heat Pump

2008 ◽  
Vol 2 (3) ◽  
pp. 208-216 ◽  
Author(s):  
Cheng Wang ◽  
Peng Zhang ◽  
Ruzhu Wang
Keyword(s):  
Heat Pump ◽  
Chemical Heat ◽  
Chemical Heat Pump
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