Analysis of Novel Regenerative Thermo-Mechanical Refrigeration System Integrated With Isobaric Engine

Sleiti, Ahmad K.; Al‐Ammari, Wahib A.; Al‐Khawaja, Mohammed

doi:10.1115/1.4049368

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…In particular, variations in the pressure in the system components were not taken into account in the force balance. Recent publications on this topic [21][22][23] do not distinguish between compression and pumping processes.…”

Section: Introductionmentioning

confidence: 99%

Isobaric Expansion Engine Compressors: Thermodynamic Analysis of the Simplest Direct Vapor-Driven Compressors

et al. 2022

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Isobaric expansion (IE) technology is a promising solution for mini- and medium-scale low-grade heat utilization. IE engines directly convert heat to mechanical energy and are particularly interesting as direct-acting, vapor-driven pumps and compressors. The elimination of multiple energy transformations, technical simplicity and the ability to use widely available low-grade heat (<100 °C) instead of fossil fuels are attractive features of this technology. The purpose of this paper was to present a new compression technology based on IE Worthington type engines, analyze the process analytically and numerically, and provide a first assessment of its potential. The simplest single- and double-acting schemes were considered for arbitrary low and high pressures of the compressed gas/vapor and driving vapor. In these schemes, the compressor piston was rigidly connected to that of an engine/driver. The vapor use efficiency of the driver process was characterized by the ratio of the network carried out in the cycle to the consumed mass of the driving vapor. The performed thermodynamic analysis showed how the vapor use efficiency depends on the process parameters. It was found that the efficiency of vapor use in the simplest schemes was low in comparison with the efficiency in pumps if the compressor work was much less than the pump work at the same pressure ratio. This occurred because the energy of the driving vapor was spent on the compression of the vapor itself. As a result, the thermal efficiency of the IE engine compressors was lower than that of the IE engine pumps. The difference was very large if the work of the engine feed pump was significant and no heat regeneration is applied. The results obtained are very useful for achieving improvements in this interesting technology, which will be reported in subsequent publications.

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Section: Introductionmentioning

confidence: 99%

Isobaric Expansion Engine Compressors: Thermodynamic Analysis of the Simplest Direct Vapor-Driven Compressors

et al. 2022

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“…Also, the proposed TMR system use eco-friendly refrigerant with zero ozone depletion potential [10]. ▪ Moreover, the new TMR system has simple configuration and competitive capital cost compared to the conventional refrigeration systems [11]. ▪ This poster describes the proposed TMR system, and the results obtained by experimental testing for a hybrid electric-TMR setup which is built by the authors in Qatar University.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

Sleiti¹,

Al‐Ammari²,

Al‐Khawaja³

2021

Building Resilience at Universities: Role of Innovation and Entrepreneurship

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The current electrical refrigeration and air condition systems are considered as one of the major sources for ozone depletion and global warming problems. Furthermore, they consume a large percentage of the worldwide gross production of electricity (around 17%). Therefore, developing new refrigeration systems that might be able to work using renewable sources (solar, geothermal, etc.) and waste heat sources is necessary to address these problems. In this paper, the experimental investigation of an innovative thermal-mechanical refrigeration (TMR) system is presented. The TMR system replaces the electric compressor of the conventional refrigeration systems with an innovative expander-compressor unit (two connected double-acting cylinders). The proposed ECU can be driven by ultra-low heat temperature sources, has simple configuration, and high flexibility for the operating conditions. A hybrid electric-compressor and ECU refrigeration setup was developed to investigate the performance of the ECU and compare it to that of an electric compressor. The experiment was conducted using R134a as a working fluid at different masses. The results show that a maximum COP of 0.57 is obtained at a refrigerant mass of 30g (in electric mode) and a maximum COP of 0.41 is obtained at a refrigerant mass of 60g (in ECU mode).

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Experimental investigations on the performance of a thermo-mechanical refrigeration system utilizing ultra-low temperature waste heat sources

Sleiti¹,

Al‐Ammari²,

Al‐Khawaja³

2023

Alexandria Engineering Journal

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Analysis of Novel Regenerative Thermo-Mechanical Refrigeration System Integrated With Isobaric Engine

Cited by 8 publications

References 27 publications

Isobaric Expansion Engine Compressors: Thermodynamic Analysis of the Simplest Direct Vapor-Driven Compressors

Isobaric Expansion Engine Compressors: Thermodynamic Analysis of the Simplest Direct Vapor-Driven Compressors

Experimental Investigation of Innovative Thermal Mechanical Refrigeration System

Experimental investigations on the performance of a thermo-mechanical refrigeration system utilizing ultra-low temperature waste heat sources

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