Results 11 to 20 of about 10,829 (309)

Pre-Cooling Concrete System in Massive Concrete Production: Energy Analysis and Refrigerant Replacement

Energies, 2022
Several techniques for cooling mass concrete structures were developed in order to increase structural integrity and reduce the influence of cement hydration, which sometimes causes cracking in concrete structures, negatively affecting their durability ...
Malik I. Alamayreh, Ali Alahmer, Mai Bani Younes, Subhi M. Bazlamit   +3 more
doaj   +3 more sources

Experimental Study of the Pressure Drop and Condensed Heat Transfer of R-406a Refrigerant in Tubes Equipped with Extended Surface of Twisted Fins in Different Steps and Lengths [PDF]

مکانیک هوافضا, 2023
Having been developed in accordance with the Montreal Protocol, R134a has been proposed as a potential replacement for R12. In accordance with the Kyoto Protocol, the use of R134a, which has a significant global warming potential, must be restricted.
Ali Yousefi Tireh Shabankare, Seyed Ali Agha Mirjalily, Seyed Amir Abbas Oloomi, Mohammad Reza Salimpour   +3 more
doaj  

Greenhouse gas mitigation and electricity saving potential from replacing refrigerants in Thai refrigerator

Energy Reports, 2021
Refrigerant leak from refrigerator production and operation is one of major sources that causes greenhouse gases (GHG) emission due to the high global warming potential (GWP) from existing Tetrafluoroethane (R-134a) which is hydrofluorocarbon (HFC) refrigerants in Thailand.
Nassanun Srikaummun, Wongkot Wongsapai, Det Damrongsak, Waranya Thepsaskul, Chaichan Ritkrekkrai, Rongphet Bunchuaidee, Neeracha Tridech, Pattaraporn Juprasert   +7 more
openaire   +2 more sources

Carbon-ammonia pairs for adsorption refrigeration applications : ice making, air conditioning and heat pumping [PDF]

, 2009
A thermodynamic cycle model is used to select an optimum adsorbent-refrigerant pair in respect of a chosen figure of merit that could be the cooling production (MJ m(-3)), the heating production (MJ m(-3)) or the coefficient of performance (COP).
Critoph, Robert E., Metcalf, Steven J., Tamainot-Telto, Zacharie, Thorpe, Roger, Zhong, Y.   +4 more
core   +1 more source

Carbon dioxide sorptive cooling in substitute model refrigeration system for replacing halogenated refrigerants

Environmental Technology & Innovation, 2021
Abstract On account of negative impacts of halogen-laden refrigerants in the biosphere through stratospheric ozone layer depletion and global warming, substitution to these obnoxious compounds by introducing environmentally benign working media and allied alternative refrigeration system has been a matter of global concern.
Zunipa Roy, Sanghamitra Barman, Gopinath Halder   +2 more
openaire   +1 more source

Theoretical investigation of the thermal performance of a novel solar loop-heat-pipe façade-based heat pump water heating system [PDF]

, 2014
The aim of the paper was to present a dedicated theoretical investigation into the thermal performance of a novel solar loop-heat-pipe façade based heat pump water heating system. This involved thermo-fluid analyses, computer numerical model development,
He, Wei, Hong, Xiaoqiang, Ji, Jie, Shen, Jinchun, Zhang, Xingxing, Zhao, Xudong   +5 more
core   +2 more sources

Effect degree of temperature subcooling in the performance of refrigeration with CFC, HFC and hydrocarbons refrigerant

MATEC Web of Conferences, 2017
Global warming is the result of the use of Chloro Fluoro Carbon (CFC) and Hydro Flouro Carbon (HFC) refrigerants. CFC and HFC refrigerants are not environmentally friendly in air conditioning systems.
Suparmin Prayudi, Antono Vendy, Nurhasanah Roswati   +2 more
doaj   +1 more source

ANN Modeling to Analyze the R404A Replacement with the Low GWP Alternative R449A in an Indirect Supermarket Refrigeration System

Applied Sciences, 2021
Artificial neural networks (ANNs) have been considered for assessing the potential of low GWP refrigerants in experimental setups. In this study, the capability of using R449A as a lower GWP replacement of R404A in different temperature levels of a ...
Morteza Ghanbarpour, Adrián Mota-Babiloni, Pavel Makhnatch, Bassam E. Badran, Jörgen Rogstam, Rahmatollah Khodabandeh   +5 more
doaj   +1 more source

Control solutions for variable refrigerant flow systems in office buildings [PDF]

E3S Web of Conferences
Variable Refrigerant Flow (VRF) systems are widely adopted as high-efficiency solutions for office buildings. In Italy, the Conto Termico 3.0 scheme promotes the replacement of fossil-fuel boilers with heat pumps, fully recognizing VRF systems as ...
Hernández Francisco Fernández, Suárez Jose Miguel Peña, Cantalejo Juan Bandera, Huertas Daniel Pallarés, Truffo Davide, Marín Desirée Quintero   +5 more
doaj   +1 more source

Super-heavy fermion material as metallic refrigerant for adiabatic demagnetization cooling [PDF]

, 2012
Low-temperature refrigeration is of crucial importance in fundamental research of condensed matter physics, as the investigations of fascinating quantum phenomena, such as superconductivity, superfluidity and quantum criticality, often require ...
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Şahin, Şahin, Šašel Kos, Šašel Kos   +539 more
core   +5 more sources