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Jose M Corberan - One of the best experts on this subject based on the ideXlab platform.

  • Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source
    Energies, 2020
    Co-Authors: Ximo Masip, Emilio Navarro-peris, Jose M Corberan
    Abstract:

    Energy recovery from a low temperature heat source using heat pump technology is becoming a popular application. The domestic hot water demand has the characteristic of being very irregular along the day, with periods in which the demand is very intensive and long periods in which it is quite small. In order to use heat pumps for this kind of applications efficiently, the proper sizing and design of the water storage tank is critical. In this work, the optimal sizing of the two possible tank alternatives, closed stratified tank and variable-water-volume tank, is presented, and their respective Performance compared, for domestic hot water production based on low temperature energy recovery in two potential applications (grey water and ultra-low temperature district heating). The results show that the efficiency of these kind of systems is very high and that variable-water-volume tanks allow a better use of the energy source, with an 8% higher exergy efficiency and around 3% better Seasonal Performance Factor (SPF), being able to provide similar comfort levels with a smaller system size.

  • Seasonal Performance assessment of sanitary hot water production systems using propane and CO2 heat pumps
    International Journal of Refrigeration, 2017
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    Heat pump water heaters can increase the energy efficiency in sanitary hot water production, which is a relevant share of the final energy consumption in multiresidential and tertiary buildings. Refrigerants for these heat pumps are changing due to the F-Gas Regulation which bans high-GWP fluids. While CO2 is an established solution, propane is a promising low-GWP alternative for heat pump water heaters serving large users in the tertiary sector, where refrigerant charge limits (due to propane's flammability) can be bypassed by installing the heat pump outdoors. Here, the components of a CO2 and a propane air-water heat pump systems of 40 kW are sized and their COPs are compared in different climates; then, the two heat pumps are coupled to a storage tank and a user demand profile (hospital and school). For three different locations, tank size necessary to maintain users' comfort and Seasonal Performance Factor are evaluated through simulation.

  • hot sanitary water production with co2 heat pumps effect of control strategy on system Performance and stratification inside the storage tank
    Applied Thermal Engineering, 2016
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    In this work three different control strategies for the production of sanitary hot water by means of an electric heat pump working with CO2 are investigated. The heat pump is a prototype, here modelled in the vapour-compression software package IMST-ART. By simulating this model, the Performance of the heat pump is correlated to the boundary conditions and is scaled to different sizes, namely 1, 1.5, and 2 times larger than the reference system. After having chosen an application for which the load profile of sanitary hot water during the year is known, these heat pumps are simulated in a TRNSYS16 model where the production of sanitary hot water and the consumption are buffered by the presence of a tank. Key parameter in guaranteeing comfort and good Performance of the system is the stratification inside the storage tank. The size of the tank necessary to keep a certain level of comfort at the user is then determined through a parametric analysis for each size of the heat pump. The energetic Performance is also evaluated for each system in terms of Seasonal Performance Factor. Then, the results obtained are compared with a different system where the heat pump is equipped with an inverter and the circulation pump follows a different control logic. The size of the tank and the Seasonal Performance Factor are therefore determined in this case too. Moreover, a “night&day” control logic is compared to these first two options to have a baseline of comparison in terms of volume of storage needed to guarantee a same level of comfort and Performance. To provide information also on the running costs, a parametric analysis was run varying the type of control, the heat pump and the tank sizes for different load profiles. The results show that the size of the heat pump has a significant effect on the comfort of the user, which usually leads to oversizing of the storage tank when the load profile is unknown. With regard to this, the results obtained for the alternative control system show a 20% reduction of the volume of the tank, given a certain level of comfort, and is therefore useful to reduce the size of the storage tank.

R Mastrullo - One of the best experts on this subject based on the ideXlab platform.

  • Seasonal Performance assessment of sanitary hot water production systems using propane and CO2 heat pumps
    International Journal of Refrigeration, 2017
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    Heat pump water heaters can increase the energy efficiency in sanitary hot water production, which is a relevant share of the final energy consumption in multiresidential and tertiary buildings. Refrigerants for these heat pumps are changing due to the F-Gas Regulation which bans high-GWP fluids. While CO2 is an established solution, propane is a promising low-GWP alternative for heat pump water heaters serving large users in the tertiary sector, where refrigerant charge limits (due to propane's flammability) can be bypassed by installing the heat pump outdoors. Here, the components of a CO2 and a propane air-water heat pump systems of 40 kW are sized and their COPs are compared in different climates; then, the two heat pumps are coupled to a storage tank and a user demand profile (hospital and school). For three different locations, tank size necessary to maintain users' comfort and Seasonal Performance Factor are evaluated through simulation.

  • hot sanitary water production with co2 heat pumps effect of control strategy on system Performance and stratification inside the storage tank
    Applied Thermal Engineering, 2016
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    In this work three different control strategies for the production of sanitary hot water by means of an electric heat pump working with CO2 are investigated. The heat pump is a prototype, here modelled in the vapour-compression software package IMST-ART. By simulating this model, the Performance of the heat pump is correlated to the boundary conditions and is scaled to different sizes, namely 1, 1.5, and 2 times larger than the reference system. After having chosen an application for which the load profile of sanitary hot water during the year is known, these heat pumps are simulated in a TRNSYS16 model where the production of sanitary hot water and the consumption are buffered by the presence of a tank. Key parameter in guaranteeing comfort and good Performance of the system is the stratification inside the storage tank. The size of the tank necessary to keep a certain level of comfort at the user is then determined through a parametric analysis for each size of the heat pump. The energetic Performance is also evaluated for each system in terms of Seasonal Performance Factor. Then, the results obtained are compared with a different system where the heat pump is equipped with an inverter and the circulation pump follows a different control logic. The size of the tank and the Seasonal Performance Factor are therefore determined in this case too. Moreover, a “night&day” control logic is compared to these first two options to have a baseline of comparison in terms of volume of storage needed to guarantee a same level of comfort and Performance. To provide information also on the running costs, a parametric analysis was run varying the type of control, the heat pump and the tank sizes for different load profiles. The results show that the size of the heat pump has a significant effect on the comfort of the user, which usually leads to oversizing of the storage tank when the load profile is unknown. With regard to this, the results obtained for the alternative control system show a 20% reduction of the volume of the tank, given a certain level of comfort, and is therefore useful to reduce the size of the storage tank.

M Tammaro - One of the best experts on this subject based on the ideXlab platform.

  • Seasonal Performance assessment of sanitary hot water production systems using propane and CO2 heat pumps
    International Journal of Refrigeration, 2017
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    Heat pump water heaters can increase the energy efficiency in sanitary hot water production, which is a relevant share of the final energy consumption in multiresidential and tertiary buildings. Refrigerants for these heat pumps are changing due to the F-Gas Regulation which bans high-GWP fluids. While CO2 is an established solution, propane is a promising low-GWP alternative for heat pump water heaters serving large users in the tertiary sector, where refrigerant charge limits (due to propane's flammability) can be bypassed by installing the heat pump outdoors. Here, the components of a CO2 and a propane air-water heat pump systems of 40 kW are sized and their COPs are compared in different climates; then, the two heat pumps are coupled to a storage tank and a user demand profile (hospital and school). For three different locations, tank size necessary to maintain users' comfort and Seasonal Performance Factor are evaluated through simulation.

  • hot sanitary water production with co2 heat pumps effect of control strategy on system Performance and stratification inside the storage tank
    Applied Thermal Engineering, 2016
    Co-Authors: M Tammaro, A W Mauro, C Montagud, Jose M Corberan, R Mastrullo
    Abstract:

    In this work three different control strategies for the production of sanitary hot water by means of an electric heat pump working with CO2 are investigated. The heat pump is a prototype, here modelled in the vapour-compression software package IMST-ART. By simulating this model, the Performance of the heat pump is correlated to the boundary conditions and is scaled to different sizes, namely 1, 1.5, and 2 times larger than the reference system. After having chosen an application for which the load profile of sanitary hot water during the year is known, these heat pumps are simulated in a TRNSYS16 model where the production of sanitary hot water and the consumption are buffered by the presence of a tank. Key parameter in guaranteeing comfort and good Performance of the system is the stratification inside the storage tank. The size of the tank necessary to keep a certain level of comfort at the user is then determined through a parametric analysis for each size of the heat pump. The energetic Performance is also evaluated for each system in terms of Seasonal Performance Factor. Then, the results obtained are compared with a different system where the heat pump is equipped with an inverter and the circulation pump follows a different control logic. The size of the tank and the Seasonal Performance Factor are therefore determined in this case too. Moreover, a “night&day” control logic is compared to these first two options to have a baseline of comparison in terms of volume of storage needed to guarantee a same level of comfort and Performance. To provide information also on the running costs, a parametric analysis was run varying the type of control, the heat pump and the tank sizes for different load profiles. The results show that the size of the heat pump has a significant effect on the comfort of the user, which usually leads to oversizing of the storage tank when the load profile is unknown. With regard to this, the results obtained for the alternative control system show a 20% reduction of the volume of the tank, given a certain level of comfort, and is therefore useful to reduce the size of the storage tank.

Assaad Zoughaib - One of the best experts on this subject based on the ideXlab platform.

  • Quasi-Steady State Modeling of an Air Source Heat Pump Water Heater
    Energy Procedia, 2011
    Co-Authors: Farouk Fardoun, Oussama Ibrahim, Assaad Zoughaib
    Abstract:

    Abstract Heat pump systems can be found in high number of applications. One of these is the production of domestic hot water. This paper presents a quasi-steady state simulation model to predict the Performance of a simple air source heat pump water heater (ASHPWH). The mathematical model consists of submodels of the basic system components, namely, evaporator, condenser, compressor, and expansion valve. These submodels were built based on fundamental principles of heat transfer and thermodynamics. The model was coded into MATLAB software and used to predict system parameters of interest such as hot water temperature, evaporating and condensing pressures, heat rejected in the condenser, electric power input, heating Seasonal Performance Factor, and coefficient of Performance.

  • New Methodology of Characterization of Seasonal Performance Factor of An Air-To-Water Heat Pump
    2010
    Co-Authors: Chantal Maatouk, Assaad Zoughaib, Denis Clodic
    Abstract:

    The threat of the global warming is alarming. The increase in oil prices remains a persistent worry and today’s energy challenges are truly critical. In this context, heat pumps in the residential sector appear to be an interesting solution to reduce energy consumption and emissions of greenhouse gases. The French government has developed, under the leadership of the “Grenelle of the environment”, two successive tax incentives that have increased the number of heat pumps (HP) sold in France for heating and / or production of domestic hot water. European standards used to characterize the air-to-water heat pump Performances are based on one test at maximum load operation for an outdoor temperature of 7°C and an outlet temperature of hot water of 35°C. These operating conditions are very different from real life conditions. They can even be quite unrealistic as they exclude start-up and shutdown, defrosting of the outdoor unit, the part load impact, and the weather and water temperature lifts. In this paper, an experimental study is performed on three air-to-water heat pumps. Tests are realized for outdoor temperature varying between -10°C and 14°C and for three water temperature levels. These tests allowed calculating the average heating Seasonal Performance Factor of the HPs. The aim of the experimental study is to select a limited number of testing conditions and to establish a methodology to assess, more realistically the HP Performance.

Alojz Poredoš - One of the best experts on this subject based on the ideXlab platform.

  • A Thermo-Economic and Emissions Analysis of Different Sanitary-Water Heating Units Embedded Within Fourth-Generation District-Heating Systems
    Journal of Energy Resources Technology, 2018
    Co-Authors: Primož Poredoš, Boris Vidrih, Andrej Kitanovski, Alojz Poredoš
    Abstract:

    This paper presents the results of a thermo-economic (TE), primary-energy-Factor and CO2-equivalent (CO2 (eq)), emissions-sensitivity analysis for the preparation of sanitary hot water (SHW) in fourth-generation district-heating systems. The annual required additional heat for the SHW provided by a local heating unit, based on an air-to-water heat pump (AWHP), a natural-gas boiler (NG boiler), and an electrical resistance heater (ERH), was determined using a trnsys simulation. Additionally, the Seasonal Performance Factor (SPF) of the HP under consideration was determined. The study considered three possible supply temperatures, i.e., 35, 40, and 45 °C. The results show that a local heating unit based on an AWHP is most efficient in terms of the used primary energy (PE) and CO2 (eq) emissions. This unit is also the second best in terms of TE Performance. The unit based on a NG boiler is much more appropriate than an ERH unit in terms of both the primary energy Factor (PEF) and the CO2 (eq) emission Factors for an electricity generation mix (EGM) that has values higher than the average for the EU-28. The heat generated by this NG unit is also cheaper than the heat produced by an ERH based on the average price for electricity in the EU-28.

  • Thermo-economic and primary-energy-Factor assessment based on the field test of an air-to-water heat pump
    International Journal of Refrigeration, 2017
    Co-Authors: Primož Poredoš, Andrej Kitanovski, Tjaša Duh Čož, Alojz Poredoš
    Abstract:

    Abstract This paper presents the results of a thermo-economic and primary-energy-Factor assessment based on the field-test results for a residential air-to-water heat pump (AWHP). The AWHP experimental setup consisted of a supervisory control and data-acquisition system, which was connected to a heat meter, an electricity meter, humidity and temperature sensors, a HP control system and a computer. Based on the experimental data, the 4-year-average Seasonal Performance Factor was determined. This information was then applied in a thermo-economic and primary-energy-Factor (PEF) analysis. The results served for a comparison of the AWHP with eight different heating systems (HSs). The results reveal that the considered AWHP represents the most thermo-economically efficient system in terms of the average final costs for heat production. The results of the PEF analysis reveal that the HS with the AWHP under investigation can be characterized as the most efficient system.