A chart for predicting the possible advantage of adopting a suction/liquid heat exchanger in refrigerating system

Mastrullo, R.; Mauro, A.W.; Tino, S.; Vanoli, Giuseppe Peter

doi:10.1016/j.applthermaleng.2007.03.001

Cited by 44 publications

(12 citation statements)

References 8 publications

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“…Using a theoretical approach and neglecting pressure drop, Domanski et al [2] concluded that it is beneficial for refrigerants with high heat capacity. Mastrullo et al [3], considering pressure losses, obtained similar conclusions about the heat capacity, but they added that the IHX is more recommended for refrigerants that provide low COP.…”

Section: Introductionmentioning

confidence: 55%

Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler

Llopis

Sanz-Kock

Cabello

et al. 2015

Applied Thermal Engineering

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We present the experimental evaluation of an internal heat exchanger or suction-line/liquid-line heat exchanger in a CO2 subcritical refrigeration plant with gas-cooler. The plant, driven by a 1.5kW CO2 semi hermetic compressor, uses brazed plate heat exchangers as condenser, evaporator and internal heat exchanger, an air finned tube gas-cooler and an electronic expansion valves. The evaluation (77 steadystates) covers evaporating temperatures from -40 to -25 ºC and condensing temperatures from -15 to 0 ºC, always at the nominal speed of the compressor. Here, the effect of the internal heat exchanger on the main energy parameters is analysed, i.e., cooling capacity, COP and heat rejection at gas-cooler and condenser. Also, the effect of the internal heat exchanger in a cascade cycle is analysed theoretically. It has been concluded that the internal heat exchanger does not improve the performance of the subcritical cycle, but it could improve the energy performance if it is used inside a cascade refrigeration system. KEYWORDS

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Section: Introductionmentioning

confidence: 55%

Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler

Llopis

Sanz-Kock

Cabello

et al. 2015

Applied Thermal Engineering

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show abstract

“…Mastrullo et al [29] developed a simple chart to verify the effectiveness of installation of an IHX using several refrigerants, and they also sustained that the vapour heat capacity is the most influential property on the performance resulting. Hermes [30] highlighted the effect of the evaporating pressure in COP variation for systems with IHX when the cooling capacity is constrained.…”

Section: Introductionmentioning

confidence: 99%

Drop-in analysis of an internal heat exchanger in a vapour compression system using R1234ze(E) and R450A as alternatives for R134a

Mota-Babiloni

Navarro-Esbrí

Barragán-Cervera

et al. 2015

Energy

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Keywords:Internal heat exchanger R1234ze(E) R134a R450A Energy efficiency Refrigeration a b s t r a c tThe IHX (internal heat exchanger) is introduced in some refrigeration systems in order to achieve higher energy performances. Results obtained vary greatly depending on the refrigerant used and working conditions. This paper describes a drop-in analysis of IHX effects on the performance of a vapour compression system using R1234ze(E) and R450A (R134a/R1234ze(E) commercial mixture) as R134a low-GWP replacements. The tests were carried out in a completely monitored vapour compression system varying the condensing and evaporating temperature, with and without a counter-current flow tube-in-tube IHX. Because the cooling capacity rises and the power consumption remains similar, the conclusion is that the IHX has a positive influence on the energy efficiency for all refrigerants tested. The COP (coefficient of performance) gain using R1234ze(E) is the highest observed (overcomes the R134a COP for the same conditions). The R1234ze(E) and R450A discharge temperature increments are lower than those of R134a so does not reach dangerous values and the IHX pressure drops are also below than that of R134a.

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“…The IHX allows obtaining this increase in suction temperature providing at the same time a small subcooling of the liquid CO2 at the exit of the condenser. This element has been widely analysed for plants working with HFC refrigerants [7][8][9] and for plants working with CO2 in transcritical conditions [10,11]. In general, its use is beneficial if the refrigerant has high heat capacity.…”

Section: Introductionmentioning

confidence: 99%

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

Llopis

Sanz-Kock

Sánchez

et al. 2016

Applied Thermal Engineering

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This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO2 subcritical cycle in an HFC134a/CO2 cascade refrigeration plant that incorporates a gas-cooler at the exit of the low temperature compressor. Previous theoretical and experimental studies showed that the IHX reduces the refrigeration capacity and COP of the subcritical cycle, however, it has been seen that it also lowers the heat to be rejected at the condenser. This reduction, when the cycle is a part of a cascade system, allows reducing the heat load of the high temperature cycle, modifying the working conditions of the cascade plant. The modifications result in an increment of the overall coefficient of performance of the cascade system. The analysis here presented is based on the evaluation of an experimental HFC134a/CO2 refrigeration plant, which has been analysed with and without internal heat exchanger in an evaporating temperature range from -40 to -30 ºC and in a condensing one from 30 to 50 ºC. The plant incorporates a gas-cooler at the exit of the CO2 compressor. The experimental results confirm that the IHX slightly reduces the cooling capacity but it can increment the overall COP up to 3.7 %.

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A chart for predicting the possible advantage of adopting a suction/liquid heat exchanger in refrigerating system

Cited by 44 publications

References 8 publications

Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler

Experimental evaluation of an internal heat exchanger in a CO2 subcritical refrigeration cycle with gas-cooler

Drop-in analysis of an internal heat exchanger in a vapour compression system using R1234ze(E) and R450A as alternatives for R134a

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

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