Effect of size on ground-coupled heat pump performance

Alalaimi, M.; Lorente, Sylvie; Anderson, R.; Bejan, Adrian

doi:10.1016/j.ijheatmasstransfer.2013.04.034

Cited by 14 publications

(9 citation statements)

References 13 publications

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“…Miniaturization is not the only requirement of MVCR; one of the most important points is how to achieve excellent cooling performance based on the miniaturization of the system. It is well known that larger systems are generally more thermodynamically efficient than smaller systems, which can be verified by the correlation of Alalaimi et al [5]; therefore, one of the main objectives of the project is to develop a numerical model to characterize the behaviour of an MVCR. Then, the most relevant parameters are In the condenser and evaporator HXs, heat is transferred between the refrigerant fluid and the heat source and dissipating medium fluids, known as secondary fluids.…”

Section: State Of the Artmentioning

confidence: 84%

Design of a Microscale Refrigeration System for Optimizing the Usable Space in Compact Refrigerators

et al. 2022

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This research aims to enter the miniature refrigeration machine sector with the objective of designing a small scale unit while maintaining a competitive coefficient of performance (COP), comparing with a Peltier plates system. To this end, a research of the current technology was carried out in order to obtain indicative values on the scales that were being worked on and their application. After the previous research, a refrigeration cycle was designed in EES (engineering equation solver). From this design, different conclusions were obtained: (1) The correct sizing of the compressor revolutions together with its displacement is crucial for the equipment to be able to provide the desired cooling capacity. (2) In order to obtain the desired cooling capacity in the microscale refrigeration system, the heat exchangers must have fins. (3) Of the analysed refrigerants, R600a is the best choice, as it shows favourable characteristics (high COP and low compression ratio) when working in this type of cycle.

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Section: State Of the Artmentioning

confidence: 84%

Design of a Microscale Refrigeration System for Optimizing the Usable Space in Compact Refrigerators

et al. 2022

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“…Research on the optimization of the parameters of the \ground heat exchanger-heat pump" has been conducted by scientists in France (Toulouse) and the USA (Denver) [10]. As the objective function is adopted with respect to cost, the calculation is carried out and the optimal size for the speci c HP ground heat exchangers is determined.…”

Section: State Of the Problemmentioning

confidence: 99%

Integrated system for the use of solar energy in the animal farm

et al. 2017

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Abstract. The advent of unique technologies of the developing Solar Energy (SE), actual energy, faces economic and environmental problems. The main obstacle to the widespread use of SE is the low value of the average annual e ciency of known solar installations. In a sharply continental climate, they are exploited only in the warm season, about 6-7 months. Known combined systems, where additional conventional water heaters duplicate the operation of solar units, require additional costs for energy carriers. These disadvantages are not o ered by the integrated system of SE use. In the article, the system was studied using the example of a cattle-breeding farm. The new system performs these functions; it recycles heat, organizes their movement and accumulation, and smooths out the uneven SE. The main components of the system are: Solar Power Plant (SPP), milk cooler, climate unit, Heat Pump (HP), the battery heat, automatic control system, and device heating and hot water. The main goal, i.e. lower cost of the energy produced and the elimination of the uneven SE, compared to the known SPP, is achieved through the ow of energy from the sources mentioned above.

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“…The more important point is how to achieve excellent cooling performance on the basis of system miniaturization. It is known that the larger systems generally are more efficient thermodynamically than the smaller systems, which can be proven by the correlation by Alaimimi et al on the relation of revisable efficiency (the second law efficiency) versus system size [24]. This in turn introduces higher requirements and more difficulties for the system miniaturization.…”

Section: Introductionmentioning

confidence: 99%