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Estudo experimental da perda de pressão em canais convencionais com o refrigerante R1234yf em ebulição convectiva
(Universidade Federal de Minas GeraisBrasilENG - DEPARTAMENTO DE ENGENHARIA MECÂNICAPrograma de Pós-Graduação em Engenharia MecanicaUFMG, 2018-05-25)
New legislation in Europe, limit the use of refrigerants with high global warming
potential (GWP). Currently the most widely used refrigerant medium temperature equipment is
the R134a with GWP of 1430, which therefore ...
Determinação da fração de vazio pelo método QCV para escoamentos bifásicos horizontais do refrigerante HFO-1234yf
(Universidade Federal de Minas GeraisBrasilENG - DEPARTAMENTO DE ENGENHARIA MECÂNICAPrograma de Pós-Graduação em Engenharia MecanicaUFMG, 2019-06-14)
This work presents an experimental study on the void fraction in two-phase horizontal flows with R1234yf fluid. The object of the study was the determination of the void fraction for a large range of quality and for some ...
Modelo dinâmico para um evaporador operando com R-1234yf e R134a
(Universidade Federal de Minas GeraisUFMG, 2018-02-02)
Currently, hydrofluoroleophins (HFOs) have been used more in refrigeration processes because they have low ozone depletion potential (ODP) and low global warming potential (GWP). With the emergence of restrictions such as ...
A review of recent research on the use of R1234yf as an environmentally friendly fluid in the organic rankine cycle
(2021-05)
ORC technology is one of the most promising technologies for the use of residual energy in the generation of electrical energy, offering simple and environmentally friendly alternatives. In this field, the selection of ...
Estudo experimental e modelo de simulação para a determinação do inventário em sistemas de refrigeração carregados com os fluidos R-134a e HFO-1234yf
(Universidade Federal de Minas GeraisUFMG, 2017-08-03)
The present work is a theoretical/experimental study on the inventory in refrigeration systems loaded with the fluids R-134a and HFO-1234yf. The first is a chlorine-free hydrofluorocarbon (HFC) with ozone depletion potential ...
Estudo experimental do coeficiente de transferência de calor local por condensação do refrigerante R1234yf em um tubo horizontal liso com diâmetro interno de 4,8 mm
(Universidade Federal de Minas GeraisBrasilENG - DEPARTAMENTO DE ENGENHARIA MECÂNICAPrograma de Pós-Graduação em Engenharia MecanicaUFMG, 2020-03-23)
The aim of this work was the experimental determination of the condensation
heat transfer coefficient for the R1234yf fluid for mass velocities of 150 kg/(m².s), 200
kg/(m².s), 250 kg/(m².s) and 300 kg/(m².s), saturation ...
Análise comparativa e modelo de simulação de um climatizador veicular com condensadores a R1234yf/água e R134a/ar
(Universidade Federal de Minas GeraisBrasilENG - DEPARTAMENTO DE ENGENHARIA MECÂNICAPrograma de Pós-Graduação em Engenharia MecanicaUFMG, 2023-02-27)
Due to recurrent crises in the energy sector and the earth global warming, car manufacturers
and researchers have been accelerating the search for more efficient vehicle air conditioning
systems (VACS) and more friendly ...
Numeric model of a direct expansion solar assisted heat pump water heater operating with low GWP refrigerants (R1234YF,R290, R600A and R744) for replacement of R134A
(Universidade Federal de Minas GeraisUFMG, 2018-09-20)
Heating water through of heat pump has a reduced consumption of electric energy duetotheuseoftheenergyavailableintheenvironment. Thisworkexploresthelackofstudies of direct expansion solar assisted heat pump (DX-SAHP) using ...
Comparação do desempenho do R-1234yf em substituição direta do R-134a em ar condicionado automotivo para máquinas agrícolas
(Universidade do Vale do Rio dos Sinos, 2016-10-14)
Automotive air conditioning for off-road agricultural machinery, like tractors and combine harvesters, presents some particular characteristics when compared with others AC systems for vehicles. Higher air velocity and ...
Comparação do desempenho do R-1234yf em substituição direta do R-134a em ar condicionado automotivo para máquinas agrícolas
(Universidade do Vale do Rio dos Sinos, 2016-10-14)
Automotive air conditioning for off-road agricultural machinery, like tractors and combine harvesters, presents some particular characteristics when compared with others AC systems for vehicles. Higher air velocity and ...