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Zhaohui, Zhang; Ruonan, Wang - 2023

Refrigerant is the working medium of refrigeration and air-conditioning systems. Currently, synthetic refrigerants are … ozone layer. The global refrigeration and air-conditioning industry is working on a refrigerant substitution based on the … environmental pollution caused by refrigerant leakage and discharge, as well as a list of climate-safe refrigerants. …

Persistent link: https://www.econbiz.de/10014540350

Heat pumps and renewable energies

Gillet, A.C. - In: Renewable Energy 9 (1996) 1, pp. 641-644

As a mean to mitigate global humanlinked environmental pollution and to achieve sustainability, renewable energies must become not just a part but THE primary energy source for the world. Heat pumps, as a process recirculating environmental heat back into useful heat production, fit the...

Persistent link: https://www.econbiz.de/10010805401

An overview of the effect of lubricant on the heat transfer performance on conventional refrigerants and natural refrigerant R-744

Wang, Chi-Chuan; Hafner, Armin; Kuo, Cheng-Shu; Hsieh, … - In: Renewable and Sustainable Energy Reviews 16 (2012) 7, pp. 5071-5086

natural refrigerant R-744. Various parameters affecting the heat transfer coefficient subject to lubricant, such as oil … convectional refrigerant. For gas cooling, the lubricant cast significant effect on heat transfer coefficient especially for a …

Persistent link: https://www.econbiz.de/10010664546

Retrofits and options for the alternatives to HCFC-22

Yang, Zhao; Wu, Xi - In: Energy 59 (2013) C, pp. 1-21

HCFC-22, widely used in variety of refrigerating/heating equipment, has been scheduled to be phased out by Montreal Protocol. This decision will result in significant reduction of ozone depletion and global warming, holding on the climate benefits accrued so far. In this paper, significant...

Persistent link: https://www.econbiz.de/10010807613

Thermo-economic and environmental optimization of solar assisted heat pump by using multi-objective particle swam algorithm

Khorasaninejad, Ehsan; Hajabdollahi, Hassan - In: Energy 72 (2014) C, pp. 680-690

In this paper, a solar assisted heat pump is modelled and optimized. Solar panel surface areas, evaporator pressure, condenser pressure, capacity of heat storage tank as well as the value of superheating/subcooling in evaporator/condenser are selected as design parameters. MOPSO (Multi-objective...

Persistent link: https://www.econbiz.de/10010809735

Influence of ambient temperatures on performance of a CO2 heat pump water heating system

Yokoyama, Ryohei; Shimizu, Takeshi; Ito, Koichi; … - In: Energy 32 (2007) 4, pp. 388-398

In residential applications, an air-to-water CO2 heat pump is used in combination with a domestic hot water storage tank, and the performance of this system is affected significantly not only by instantaneous ambient air and city water temperatures but also by hourly changes of domestic hot...

Persistent link: https://www.econbiz.de/10010811609

An experimental investigation of bubble nucleation of a refrigerant in pressurized boiling flows

Murshed, S.M. Sohel; Vereen, Keon; Strayer, Darton; … - In: Energy 35 (2010) 12, pp. 5143-5150

associated bubble characteristics of a refrigerant in a narrow vertical duct. A high-pressure flow boiling test loop was built … measurement of heater surface temperature. Refrigerant R-134a is used as the test fluid at different pressures ranging from 690 to …

Persistent link: https://www.econbiz.de/10011053541

Advances in liquid based photovoltaic/thermal (PV/T) collectors

Daghigh, R.; Ruslan, M.H.; Sopian, K. - In: Renewable and Sustainable Energy Reviews 15 (2011) 8, pp. 4156-4170

water and refrigerant (working fluid) as heat removal medium for different applications has been conducted. Future direction … of water-cooled and refrigerant hybrid photovoltaic thermal systems was presented. This study revealed that the direct …

Persistent link: https://www.econbiz.de/10010577202

Recent advances in the solar water heating systems: A review

Shukla, Ruchi; Sumathy, K.; Erickson, Phillip; Gong, Jiawei - In: Renewable and Sustainable Energy Reviews 19 (2013) C, pp. 173-190

tank and heat exchanger. The later part of this paper covers the alternative refrigerant technology and technological …

Persistent link: https://www.econbiz.de/10010608378

An analysis of systemic risk in alternative securities settlement architectures

Iori, Giulia - 2004

This paper compares securities settlement gross and netting architectures. It studies settlement risk arising from exogenous operational delays and compares settlement failures between the two architectures as functions of the length of the settlement interval under different market conditions....

Persistent link: https://www.econbiz.de/10009639464

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