Simulation of heat pumps for simultaneous heating and cooling using CO2

Diaby, Ahmadou Tidiane; Byrne, Paul; Maré, Thierry

doi:10.1016/j.ijrefrig.2019.03.010

Cited by 21 publications

(18 citation statements)

References 31 publications

(25 reference statements)

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“…The authors performed a numerical study to compare this heat pump architecture operating with CO 2 and with R407C, and observed that CO 2 can outperform the HFC in terms of environmental impact. Diaby et al (2019) [24] is a continuation of the previous work, as the authors present heat pump models for either simultaneous cooling, SH, and DHW or desalination. The numerical results in both cases are satisfactory, and the authors conclude that CO 2 is an exceptionally suited refrigerant for multipurpose heat pumps compared to "standard" refrigerants.…”

Section: Introductionmentioning

confidence: 92%

Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production

2021

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The hotel sector is characterized by high thermal demands and a large carbon footprint, which greatly contributes to the global warming effect. Consequently, there is a need to investigate solutions that can reduce energy usage within this sector by means of environmentally friendly and sustainable technologies. Integrated CO2 heat pump systems for heating, cooling, and hot water production in hotels have demonstrated promising results. This paper theoretically compares the energy consumption, environmental impact, and cost of three different design concepts for integrated CO2 units equipped with thermal storage. The main characteristics of the evaluated designs are single-stage compression, parallel compression, and ejector-supported parallel compression. Furthermore, two separate hot water charging strategies were implemented and investigated over a large span of ambient temperatures and loads. The evaluations were carried out by considering eight different European locations, ranging from Scandinavia to the Mediterranean. The results revealed that the ejector-supported parallel compression design was superior in terms of annual COP, which was found to be in the range of 4.27 to 5.01 for the Scandinavian locations and 5.03 to 5.71 for the other European locations. When accounting for investment cost and electricity prices, the payback period at the Scandinavian locations was 6.3 to 7.7 years. Payback periods of 3 and 4.5 to 7.5 were obtained for hotels located in the temperate and Mediterranean climates, respectively. The investigation also revealed that the hot water charging strategy, rather than the specific CO2 heat pump design, is the least expensive measure to enhance performance.

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Section: Introductionmentioning

confidence: 92%

Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production

2021

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“…Recently, the potential interest of coupling MD with a heat pump for simultaneous cooling of residential and commercial buildings and clean water production was demonstrated [9,47]. It is estimated that 17% of the global electric energy is consumed by the four billion air conditioning and refrigeration devices installed worldwide [3].…”

Section: Heat Pumps For Desalinationmentioning

confidence: 99%

Experimental Study of a Heat Pump for Simultaneous Cooling and Desalination by Membrane Distillation

et al. 2021

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Heat pump systems can simultaneously produce cooling energy for space cooling in hotels, office and residential buildings and heat for desalination using membrane distillation (MD). The MD technique uses a heat input at a temperature compatible with the levels of heat pump condensers (<60 °C). A heat pump prototype coupled with an air-gap membrane distillation unit was constructed and tested. This paper presents the experimental study on a lab-scale prototype and details the two operating modes “continuous” and “controlled” simulating an air conditioning system and a food storage, respectively. The experimental results enable to analyze the performance of the prototype and the physical phenomena involved. Finally, the study shows that this system could be a promising solution to help supplying freshwater to people in hot regions of the world.

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“…A good example of where thin-walled pipes are vital is in the use of high pressure refrigeration systems, such as two-phase CO 2 cooling. CO 2 is a particularly attractive refrigerant as it is a non-toxic, non-flammable gas that does not contribute to ozone depletion [3] and is significantly cheaper than fluorocarbons. Two-phase CO 2 cooling exploits the latent heat change of the liquid to gas transition in order to generate a cooling effect.…”

Section: High Pressure Cooling Systemsmentioning

confidence: 99%

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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Small diameter thin-walled pipes, typically with a diameter less than 20 mm and a ratio of outer diameter to wall thickness is 20 or above, have increasingly become a key value adding factor for a number of industries including medical applications, electronics and chemical industries. In high-energy physics experiments, thin-walled pipes are needed in tracking detector cooling systems where the mass of all components needs to be minimised for physics measurement reasons. The pipework must reliably withstand the cooling fluid operation pressures (of up to 100 bar), but must also be able to be reliably and easily joined within the cooling system. Suitable standard and/or commercial solutions combining the needed low mass and reliable high-pressure operation are poorly available. The following review of literature compares the various techniques that exist for the manufacture and joining of thin-walled pipes, both well-established techniques and novel methods which have potential to increase the use of thin-walled pipes within industrial cooling systems. Gaps in knowledge have been identified, along with further research directions. Operational challenges and key considerations which have to be identified when designing a system which uses thin-walled pipes are also discussed.

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Simulation of heat pumps for simultaneous heating and cooling using CO2

Abstract: Highlights  A model of a CO2 heat pump is described  A first model simulates a heat pump for simultaneous heating and cooling  A second model simulates a heat pump for simultaneous cooling and desalination  CO2 proposes new interesting applications for multi-function heat pumps

Cited by 21 publications

References 31 publications

Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production

Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production

Experimental Study of a Heat Pump for Simultaneous Cooling and Desalination by Membrane Distillation

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

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