Study on Technical and Economical Solutions for Improving Air-conditioning Efficiency in Building Sector

Ilie, Anica; Dumitrescu, Rodica; Girip, Alina; Cublesan, Valentin

doi:10.1016/j.egypro.2017.03.1113

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…As modern trend in AC system the VRF systems are considered [18][19][20][21]. The VRF system maintains the zone air temperature at the set-point by supplying adequate refrigerant to indoor fan coils to meet the space cooling load needs [22].…”

Section: Literature Reviewmentioning

confidence: 99%

“…It was shown that negative impacts on the indoor comfort of the outdoor air not completely processed and introduced to the indoor environment were much greater than that of the indoor units processing the thermal loads of the indoor air [19]. Therefore the refrigerant flow control in the VRF-OAP system has been designed to provide more flows to the OAP than to the indoor units and most of the refrigerant flows inside the system were introduced to the OAP.…”

Section: Literature Reviewmentioning

confidence: 99%

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An Innovative Air Conditioning System for Changeable Heat Loads

Trushliakov

Radchenko

Bohdal

et al. 2020

Lecture Notes in Mechanical Engineering

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The efficiency of air conditioning (AC) systems depends on the operation of their air coolers at varying heat loads in response to current changeable climatic conditions. In general case, an overall heat load of any AC system comprises the unstable range, corresponding to ambient air processing with heat load fluctuations, and a comparatively stable part for subsequent air subcooling. Following from this approach, a rational design overall heat load is chosen to provide a maximum annular refrigeration capacity generation and divided into a comparatively stable basic part and a remaining part for ambient air precooling at changeable heat loads. The ambient air precooling mode with considerable heat load fluctuation needs load modulation, whereas the comparatively stable heat load range can be covered by operation at about nominal mode. According to modern trend in AC systems the load modulation is performed by varying refrigerant feed to air coolers in Variable Refrigerant Flow (VRF) system. But with this the problem of inefficient operation of air coolers caused by dry-out of inner walls at the final stage of inside tube refrigerant evaporation followed by dropping the intensity of heat transfer remains unsolved. As alternative approach of the heat load modulation in AC systems there is a concept of incomplete refrigerant evaporation with overfilling air coils that leads to excluding a dry-out of inner surface of air coils and is realized through liquid refrigerant recirculation by injector (jet pump).

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

An Innovative Air Conditioning System for Changeable Heat Loads

Trushliakov

Radchenko

Bohdal

et al. 2020

Lecture Notes in Mechanical Engineering

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“…In order to enhance and estimate the efficiency of fuel saving technologies based on engine cyclic air cooling the various simulation methods with using ANSYS program complexes, 49,51 methods for processing the data on ambient air parameter influence on AECS loading, 52,53 air temperature and humidity control, 54,55 exhaust energy recovery 56 and economical analysis 57 were applied.…”

Section: Introductionmentioning

confidence: 99%

A novel degree-hour method for rational design loading

Radchenko

Mikielewicz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Cooling degree-hours (CDH) received the broadest application in evaluation of the ambient air cooling efficiency in power engineering (engine intake air cooling systems) and air conditioning. The current CDH numbers are defined as a drop in air temperature multiplied by associated time duration of performance and their summarized annual number is used to estimate the annual effect achieved due to sucked air cooling in power plants based on combustion engines (fuel saving, power output increment) and in air conditioning (refrigeration energy generation according to needs). A majority of approaches to designing ambient air cooling systems is proceeding from the cooling capacity of the chillers selected to provide a maximum current or annual CDH number with corresponding maximum current or annual effect (additional energy produced or fuel consumption reduction) in site climate location. But such approaches lead to inevitable oversizing the chillers and cooling systems in the whole. The analysis of intake air cooling efficiency in site varying climatic conditions, accompanied by quite a simple numerical simulation, enabled to reveal the potential of its enhancement and evaluate numerically the results of each step of designing in logical sequence. The new approaches to cooling system rational designing were introduced, that enables to synthesize and substantiate innovative principal decisions to exclude unproductive waste of installed (design) cooling capacity in actual operation. The innovative findings of methodological approaches include the use of the rate of annual CDH number increment as an indicator for selecting the optimum and rational values of design cooling capacity. The optimum cooling capacity corresponds to maximum rate of summarized annual CDH increment and maximum level of thermal loading accordingly, which provides minimum sizes of the chiller. In reality, it is a minimum permissible value of cooling capacity of the chiller installed and the overall ambient air cooling system. The rational cooling capacity, that enables to achieve practically maximum value of annual CDH and avoid chiller oversizing, is determined as the second, local, maximum of the rate in the summarized annual CDH over the range above the first one, global, maximum. A rational design cooling capacity determined by applying the novel methodology allows to decrease the ambient air cooling system sizes by 15 to 20% compared with traditional designing issuing from the peaked thermal load during a year. With this practically a maximum annual effect in fuel saving (energy generation or others) can be achieved too.

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“…They are outstandingly used in residential and other sectors (offices, hotels, restaurants, storage warehouses, schools, hospitals, etc.) [2], what makes them classified among the most energy consumers.…”

Section: Introductionmentioning

confidence: 99%

Solar Air-Conditioning Systems

Aridhi¹,

H'mida²,

Mami³

2018

Sustainable Air Conditioning Systems

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The chapter presents the recent studies focusing on optimizing the efficiency of air-conditioning (AC) systems using solar energy. For this purpose, several advanced AC plants (absorption, adsorption, and desiccant) are designed. Their technology and components are described in this chapter. It also discusses the energy intake of the solar energy use in airconditioning, especially in rural regions where the electricity shortage is frequent, as well as the reduction of the energy costs and the pollution rate. A comparison between solar AC systems and traditional AC systems at the level of the designs, costs, and effectiveness is made at the end of the chapter.

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Study on Technical and Economical Solutions for Improving Air-conditioning Efficiency in Building Sector

Cited by 11 publications

References 1 publication

An Innovative Air Conditioning System for Changeable Heat Loads

An Innovative Air Conditioning System for Changeable Heat Loads

A novel degree-hour method for rational design loading

Solar Air-Conditioning Systems

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