Performance of Heat Driven Type Water Cooler Using Metal Hydride

2010 ◽  
Author(s):  
Sangchul Bae ◽  
Yusuke Haruna ◽  
Naoko Nohmi ◽  
Keisuke Ishikawa ◽  
Masafumi Katsuta
Keyword(s):  
Metal Hydride ◽  
System Performance ◽  
Heat Pumps ◽  
Cooling Load ◽  
Chemical Heat ◽  
Alloy Heat ◽  
Activation Characteristic ◽  
Water Cooler ◽  
Type Water ◽  
Cooling Part

In this study, we aim at developing the heat driven type water cooler using metal hydride (abbr., MH) alloy. Heat driven type MH water cooler is one of the chemical heat pumps, and the endothermic reaction on the cooling part MH (to put it simply, MH2) is used for the cooling. Because MH is too expensive (200∼300 $ per 1kg) and has an unfavorable activation characteristic, this cooler has not been used generally yet. In order to increase the system performance, we use a new TiFe alloy, which has been developed by co-researcher, to the heat source part MH (to put it simply, MH1). Moreover, to improve the cooling load per MH mass, we mix the brush type carbon fiber, 2 mass% into MH beds. By this method, the cooling load per MH mass is been increased to 0.078 kW/kg (MH2).

scholarly journals Kinetic study of lithium orthosilicate pellets for high‐temperature chemical heat pumps

2019 ◽  
Vol 1 (4) ◽  
Author(s):  
Seon Tae Kim ◽  
Takuya Nihei ◽  
Chisato Kurahashi ◽  
Hitoshi Hoshino ◽  
Hiroki Takasu ◽  
...  
Keyword(s):  
High Temperature ◽  
Kinetic Study ◽  
Heat Pumps ◽  
Chemical Heat ◽  
Lithium Orthosilicate

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.

Design, Simulation and Preliminary Results of an All Electric Net-Zero Energy Solar Home

2008 ◽  
Author(s):  
Benjamin P. Barnes ◽  
Luis A. Martinez ◽  
Trishan Esram ◽  
Ty A. Newell ◽  
Patrick L. Chapman
Keyword(s):  
Mechanical System ◽  
System Performance ◽  
Heat Pumps ◽  
Electrical System ◽  
Zero Energy ◽  
University Of Illinois ◽  
Solar Decathlon ◽  
Net Zero Energy ◽  
Net Zero ◽  
The University

This paper describes the mechanical systems, the DC-coupled electrical system, the simulation approach and the preliminary results of the University of Illinois entry in the 2007 Department of Energy Solar Decathlon competition. The competition showcased twenty net-zero energy solar powered houses. The University of Illinois entry was the only one that featured an all-electric design. No solar thermal collectors were used; space and water heating was accomplished primarily through heat pumps. Each of three house modules is sensibly conditioned with autonomous, custom mini-split heat pumps using all radiant and natural convection heat exchange for the interior side. Simulation methods are described and assumptions of wall and window properties, mechanical system performance and electrical system performance are disclosed. Details are provided on the theoretical analysis of internal heat transfer and the basic design of the custom mechanical system. The electrical system topology and equipment choices are presented and initial performance results are shown. Additionally, preliminary analysis is carried out on the data taken during the Solar Decathlon competition and on the observations of post-competition winter performance. The success in being awarded comfort conditioning points during the competition is discussed along with drawbacks not represented in the competition results.

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