The Experts below are selected from a list of 4503 Experts worldwide ranked by ideXlab platform

Rafael Llopis - One of the best experts on this subject based on the ideXlab platform.

  • experimental evaluation of a co2 transcritical Refrigeration Plant with dedicated mechanical subcooling
    International Journal of Refrigeration-revue Internationale Du Froid, 2016
    Co-Authors: Rafael Llopis, Laura Nebotandres, Daniel Sánchez, R Cabello, Jesus Catalangil
    Abstract:

    The authors gratefully acknowledge the Ministerio de Economia y Competitividad (project ENE2014-53760-R.7) and Jaume I University (project P11B2015-66) for financing this research work.

  • effects caused by the internal heat exchanger at the low temperature cycle in a cascade Refrigeration Plant
    Applied Thermal Engineering, 2016
    Co-Authors: Rafael Llopis, Carlos Sanzkock, Laura Nebotandres, Ramón Cabello, D Sanchez, Jesus Catalangil
    Abstract:

    Abstract This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO 2 subcritical cycle in an HFC134a/CO 2 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/CO 2 Refrigeration Plant, which has been analysed with and without internal heat exchanger in an evaporating temperature range from −40 to −30 °C and in a condensing one from 30 to 50 °C. The Plant incorporates a gas-cooler at the exit of the CO 2 compressor. The experimental results confirm that the IHX slightly reduces the cooling capacity but it can increment the overall COP up to 3.7%.

  • Experimental evaluation of a R134a/CO2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanz-kock, Rafael Llopis, Ramón Cabello, Daniel Sánchez, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • experimental evaluation of a r134a co2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanzkock, Rafael Llopis, Daniel Sánchez, R Cabello, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Abstract Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity ( Q ˙ ev ) if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions.

E Torrella - One of the best experts on this subject based on the ideXlab platform.

  • experimental evaluation of a r134a co2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanzkock, Rafael Llopis, Daniel Sánchez, R Cabello, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • Experimental evaluation of a R134a/CO2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanz-kock, Rafael Llopis, Ramón Cabello, Daniel Sánchez, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Abstract Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity ( Q ˙ ev ) if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity View the MathML source if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions

  • energetic evaluation of an internal heat exchanger in a co2 transcritical Refrigeration Plant using experimental data
    International Journal of Refrigeration-revue Internationale Du Froid, 2011
    Co-Authors: E Torrella, Rafael Llopis, D Sanchez, Ramón Cabello
    Abstract:

    Abstract The performance of an Internal Heat Exchanger (IHX) operating in a CO 2 transcritical Refrigeration Plant is analysed, from an energetic point of view, in this work. The evaluation is based on experimental data by contrasting the performance of the Plant working with (44 tests) and without the IHX (46 tests) at the same operating conditions. The experimental evaluation covers three evaporating levels (−5, −10 and −15 °C), at two different gas-cooler outlet temperatures each (31, 34 °C), for a wide range of gas-cooler operating pressures (74.5–105.9 bar). The thermal effectiveness of the IHX is empirically analysed for the different operating conditions in the first part of the paper. Moreover, the relation of its effectiveness with the operating parameters is presented. The second part is devoted to analyse the modification of the energetic performance of the Plant caused by the IHX. The results show a maximum increment on cooling capacity of 12%, an increment of the efficiency of the Plant up to 12% and a maximum increase on discharge temperature of 10 °C at −15 °C of evaporating temperature.

Ramón Cabello - One of the best experts on this subject based on the ideXlab platform.

  • effects caused by the internal heat exchanger at the low temperature cycle in a cascade Refrigeration Plant
    Applied Thermal Engineering, 2016
    Co-Authors: Rafael Llopis, Carlos Sanzkock, Laura Nebotandres, Ramón Cabello, D Sanchez, Jesus Catalangil
    Abstract:

    Abstract This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO 2 subcritical cycle in an HFC134a/CO 2 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/CO 2 Refrigeration Plant, which has been analysed with and without internal heat exchanger in an evaporating temperature range from −40 to −30 °C and in a condensing one from 30 to 50 °C. The Plant incorporates a gas-cooler at the exit of the CO 2 compressor. The experimental results confirm that the IHX slightly reduces the cooling capacity but it can increment the overall COP up to 3.7%.

  • Experimental evaluation of a R134a/CO2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanz-kock, Rafael Llopis, Ramón Cabello, Daniel Sánchez, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Abstract Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity ( Q ˙ ev ) if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity View the MathML source if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions

  • energetic evaluation of an internal heat exchanger in a co2 transcritical Refrigeration Plant using experimental data
    International Journal of Refrigeration-revue Internationale Du Froid, 2011
    Co-Authors: E Torrella, Rafael Llopis, D Sanchez, Ramón Cabello
    Abstract:

    Abstract The performance of an Internal Heat Exchanger (IHX) operating in a CO 2 transcritical Refrigeration Plant is analysed, from an energetic point of view, in this work. The evaluation is based on experimental data by contrasting the performance of the Plant working with (44 tests) and without the IHX (46 tests) at the same operating conditions. The experimental evaluation covers three evaporating levels (−5, −10 and −15 °C), at two different gas-cooler outlet temperatures each (31, 34 °C), for a wide range of gas-cooler operating pressures (74.5–105.9 bar). The thermal effectiveness of the IHX is empirically analysed for the different operating conditions in the first part of the paper. Moreover, the relation of its effectiveness with the operating parameters is presented. The second part is devoted to analyse the modification of the energetic performance of the Plant caused by the IHX. The results show a maximum increment on cooling capacity of 12%, an increment of the efficiency of the Plant up to 12% and a maximum increase on discharge temperature of 10 °C at −15 °C of evaporating temperature.

Daniel Sánchez - One of the best experts on this subject based on the ideXlab platform.

  • experimental evaluation of a co2 transcritical Refrigeration Plant with dedicated mechanical subcooling
    International Journal of Refrigeration-revue Internationale Du Froid, 2016
    Co-Authors: Rafael Llopis, Laura Nebotandres, Daniel Sánchez, R Cabello, Jesus Catalangil
    Abstract:

    The authors gratefully acknowledge the Ministerio de Economia y Competitividad (project ENE2014-53760-R.7) and Jaume I University (project P11B2015-66) for financing this research work.

  • Experimental evaluation of a R134a/CO2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanz-kock, Rafael Llopis, Ramón Cabello, Daniel Sánchez, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • experimental evaluation of a r134a co2 cascade Refrigeration Plant
    Applied Thermal Engineering, 2014
    Co-Authors: Carlos Sanzkock, Rafael Llopis, Daniel Sánchez, R Cabello, E Torrella
    Abstract:

    Abstract We present the experimental evaluation of a R134a/CO2 cascade Refrigeration Plant designed for low evaporation temperature in commercial Refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the Plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Abstract Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity ( Q ˙ ev ) if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions.

  • Energetic evaluation of a CO2 Refrigeration Plant working in supercritical and subcritical conditions
    Applied Thermal Engineering, 2014
    Co-Authors: Daniel Sánchez, Rafael Llopis, Ramón Cabello, Carlos Sanz-kock, J. Patiño, E Torrella
    Abstract:

    Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 °C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 Refrigeration Plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 Refrigeration Plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity View the MathML source if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the Refrigeration Plant could improve under certain subcritical and supercritical conditions

Jesus Catalangil - One of the best experts on this subject based on the ideXlab platform.

  • experimental evaluation of a co2 transcritical Refrigeration Plant with dedicated mechanical subcooling
    International Journal of Refrigeration-revue Internationale Du Froid, 2016
    Co-Authors: Rafael Llopis, Laura Nebotandres, Daniel Sánchez, R Cabello, Jesus Catalangil
    Abstract:

    The authors gratefully acknowledge the Ministerio de Economia y Competitividad (project ENE2014-53760-R.7) and Jaume I University (project P11B2015-66) for financing this research work.

  • effects caused by the internal heat exchanger at the low temperature cycle in a cascade Refrigeration Plant
    Applied Thermal Engineering, 2016
    Co-Authors: Rafael Llopis, Carlos Sanzkock, Laura Nebotandres, Ramón Cabello, D Sanchez, Jesus Catalangil
    Abstract:

    Abstract This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO 2 subcritical cycle in an HFC134a/CO 2 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/CO 2 Refrigeration Plant, which has been analysed with and without internal heat exchanger in an evaporating temperature range from −40 to −30 °C and in a condensing one from 30 to 50 °C. The Plant incorporates a gas-cooler at the exit of the CO 2 compressor. The experimental results confirm that the IHX slightly reduces the cooling capacity but it can increment the overall COP up to 3.7%.