Due to the utilization of solar thermal energy and environmentally friendly nature, globally there is a huge thrust toward the development of vapor adsorption refrigeration systems. Indeed, it is necessary to identify the minimum, maximum and optimum temperatures of heat source for solar-powered adsorption systems. With this objective, the presented paper focuses on the evaluation of lower, upper and optimum temperatures of the heat source to run the adsorption refrigeration system. Performance parameters, cooling capacity and coefficient of performance (COP), have been utilized to derive the limits of source (desorption) temperatures and applied to two different adsorbent–adsorbate pairs, namely Maxsorb III–ethanol and Maxsorb III– R134a. The adsorption and evaporator temperatures considered for the analysis are 25–40 °C and − 10–10 °C, respectively. © 2020, King Fahd University of Petroleum & Minerals.

Banker N.D.

Dandotiya D.

Morthala S.V.R.

Gaddam M.

Kakileti S.

<p>Shiv Nadar University is a comprehensive, multidisciplinary, research-focused, and student-centric University offering a full range of academic programs at the undergraduate, postgraduate and doctoral level. With state-of-the-art infrastructure, the University comprises of academic wings, sophisticated labs, international standard sports facilities, amphitheaters, auditorium, conference rooms and smart classrooms. The University&rsquo;s goal is to become internationally recognized for the quality of its research and creative endeavors and their applicability to improving quality of life, generating new insights and expanding the boundaries of human knowledge creativity. Committed to excellence in teaching, research and service, the University aims to serve the higher education needs of India and the world beyond.</p>

Shiv Nadar University

Arabian Journal for Science and Engineering

Recently, renewable sources of energy, particularly, solar thermal energy, have gained significant attention for developing heating and cooling mechanisms for buildings. This work aims at developing a theoretical model for space heating based on phase change material (PCM) using solar energy in winter conditions for the Northern region of India. The system has two PCM containers placed inside the room on the two opposite walls, which receives heat from concentrating solar system during the daytime. After achieving the temperature of PCM above its melting point using the solar system, the stored heat of PCM is released to the room ambient during the nighttime when the room ambient is at lower temperature. OM-37, having melting temperature of 37°C, has been used as a PCM for the current research work. The numerical investigation of the system shows that temperature of the room reaches to 26-27°C from 15°C in 4-5h of operation and thus ensuring thermal comfort of occupants. © 2020 World Scientific Publishing Company.

International Journal of Air-Conditioning and Refrigeration

Theoretical and Experimental Modeling of Phase Change Material-Based Space Heating Using Solar Energy

Presently, to enhance the thermal efficiency of a gas turbine power plant, turbine inlet air cooling (TIAC) is the widely used technique. The conventional refrigeration methods like vapor compression refrigeration and evaporative cooling need electric power, hence absorption and adsorption refrigeration systems are attractive options as they can be powered using the waste heat energy of the exhaust gases. Adsorption system has advantages over absorption system like scalability, requirement of lower heat source temperature, absence of corrosion and crystallization. This paper focuses on the thermodynamic analysis of waste heat powered adsorption chiller used for the cooling of intake air to enhance the net power output of the gas turbine power plant. This paper also presents a comparative analysis of the vapor-adsorption cycle-based TIAC system for four different refrigerants viz. HFC-134a, carbon dioxide, ethanol and ammonia with the motive of finding a substitute refrigerant for HFC-134a which has a high global warming potential (GWP). The adsorption chiller is mathematically modeled in MATLAB with activated carbon as the adsorbent and each one of carbon dioxide, ethanol and ammonia as the adsorbate. The variation of the coefficient of performance (COP) and specific cooling effect (SCE) with varying adsorption temperatures is presented for each pair. The net power output and primary energy rate (PER) improvement of the gas turbine power plant at different ambient temperatures are also discussed. It is observed that ammonia can improve the power plant performance significantly better compared to the other three refrigerants at ambient temperatures less than 40°C. © 2018 World Scientific Publishing Company.

Performance Comparison of a Vapor-Adsorption Cycle-Based Gas Turbine Inlet Air Cooling System for Different Refrigerants

Significant amount of world's power generation comes from gas turbine and coal based power plants which release high temperature exhaust gas to the atmosphere, wasting valuable energy and contributing enormously to the global warming. In this scenario, to harness the waste energy, a cogeneration system combining power, and cooling into a single system has been proposed in this paper. The paper presents a thermodynamic analysis of a gas turbine power plant integrated with an adsorption refrigeration system which is driven by the waste exhaust heat of the power plant. A mathematical model has been developed to estimate the net power output of the gas turbine plant and validated with previously reported work. Later, adsorption refrigeration system with activated carbon-HFC134a pair has been incorporated in the mathematical model and performance of the complete system is evaluated based on the parameters such as coefficient of performance (COP), refrigeration capacity, exhaust gas temperature and primary energy rate (PER) and their variation with the ambient and desorption temperatures is presented. © 2017 Elsevier Ltd

Applied Thermal Engineering

Thermodynamic assessment of a gas turbine power plant integrated with an adsorption refrigeration system

Solar Energy

Experimental study of a solar adsorption refrigeration system integrated with a compound parabolic concentrator based on an enhanced mass transfer cycle in Kunming, China