HYCSOS: a chemical heat pump and energy conversion system based on metal hydrides. 1979 status report

Sheft, I.; Gruen, D. M.; Lamich, G.

doi:10.2172/6033924

Cited by 4 publications

(3 citation statements)

References 2 publications

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Section: Thermodynamic Cycle Of a Metal Hydride Heat Pump (Mhhp)mentioning

confidence: 99%

“…The vertical part of the tube fitting with a valve is prepared to charge hydrogen initially. Figure 2 (right) is the thermodynamic cycle diagram of an MHHP system illustrated in the van't Hoff plot [4]. MH HT cycles between temperatures T M and T H with corresponding equilibrium pressures of hydrogen at States 1 and 2.…”

Section: Thermodynamic Cycle Of a Metal Hydride Heat Pump (Mhhp)mentioning

confidence: 99%

“…The reaction enthalpy of metal hydrides in the range of 30 to 80 kJ/mol•H 2 is reasonably higher than the phase transition energy of H 2 O (40 kJ/mol) or CFCs (6 kJ/mol). The thermodynamic cycle of a metal hydride heat pump (MHHP) system was developed by Argonne National Laboratory in 1979 and became popular worldwide [4]. The MHHP keeps the typical advantages of a sorption-type chemical-heat pump while avoiding their disadvantages, such as system complexity and a limited temperature ranges due to the material characteristics of reaction agent (i.e., water and LiBr or NH 3 ).…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study for Performance Prediction of a Metal Hydride Thermal Energy Conversion System Elaborating the Superadiabatic Condition

2020

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In this study, we investigate a numerical-modeling method uniquely performing analyses of 50 different metal hydrides to find the optimized thermal effect. This paper presents a metal-hydride thermal energy conversion method, which offers an alternative approach to the traditional vapor-compression heat pump associated with conventional heating, ventilation, and air conditioning (HVAC). The authors have developed an innovative heat pump applicable to non-vapor compression-based systems, which are in compliance with low-temperature heat source requirements for operation. The new heat pump has a high-energy savings potential for both heating and cooling that featured two different metal-hydrides, that are distributed inside parallel channels filled with porous media. Thermal energy conversion is developed as a set of successive thermal waves. The numerical-modeling results present the enhanced thermal effect, which is attained in a synchronous motion of the thermal waves and the heat source (or sink) inside paired porous media channels, which accompanies the phase transition in the succession of unit metal-hydride heat pumps. The results present in a form convenient for the prediction of thermal energy efficiency based on the proposed thermal-conversion method in real devices that were experimentally verified in previous work. The non-vapor technologies will be operational with low energy input, which makes it possible to utilize waste heat or low-level heat often found in the environment such as solar radiation, exhaust gas from a heat engine, or high-temperature fuel cell system.

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Section: Thermodynamic Cycle Of a Metal Hydride Heat Pump (Mhhp)mentioning

confidence: 99%

Section: Thermodynamic Cycle Of a Metal Hydride Heat Pump (Mhhp)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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