Recent advances in building air conditioning systems

Afonso, Clito

doi:10.1016/j.applthermaleng.2006.01.016

Cited by 64 publications

(14 citation statements)

References 18 publications

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“…The new hygroscopic salt solution H 2 O/KCOOH (potassium formate) is cheap, non-corrosive, biodegradable, and it exhibits a very high solubility (up to 80% at ambient temperature) which ensures a consistent humidity reduction (Longo and Page 2 of 18 Gasparella, 2005), therefore it seems to be very promising as "desiccant of the future" (Longo and Gasparella, 2015). H 2 O/KCOOH was already applied as desiccant in a packed column (Longo and Gasparella, 2005) and in a rotor impeller absorber (Alfonso, 2006) for sorption dehumidification of the air. More recently a H 2 O/KCOOH desiccant cooling system driven by the heat recovery on a biomass boiler was experimentally investigated (Qiu et al, 2013), an innovative micro-liquid desiccant dehumidification system using H 2 O/KCOOH was studied (Jradi and Riffat, 2014) and a latent heat converter working with H 2 O/KCOOH was applied for the thermo-hygrometric control of a flower green house in winter season (Longo and Gasparella, 2015).…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Longo

Gasparella

2016

International Journal of Refrigeration

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Section: Introductionmentioning

confidence: 99%

Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Longo

Gasparella

2016

International Journal of Refrigeration

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“…The substitution of these compression machines by thermally driven cooling systems using renewable energy or waste heat is a promising alternative. An overview of different technologies for thermally driven cooling systems can be found in Afonso (2006). In particular, due to a high correlation between solar irradiation and cooling demand for most buildings, the application of solar energy is very attractive.…”

Section: Introduction 11 System Approachmentioning

confidence: 99%

Absorberand Regenerator Models for Liquid Desiccant Air Conditioning Systems: Validation and Comparison Using Experimental Data

Krause

Saman

Halawa

et al. 2008

Proceedings of ISES World Congress 2007 (Vol. I – Vol. V)

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Solar assisted air conditioning systems using liquid desiccants represent a promising option to decrease high summer energy demand caused by electrically driven vapor compression machines. The main components of liquid desiccant systems are absorbers for dehumidifying and cooling of supply air and regenerators for concentrating the desiccant. However, high efficient and validated reliable components are required and the design and operation have to be adjusted to each respective building design, location, and user demand. Simulation tools can help to optimize component and system design. The present paper presents new developed numerical models for absorbers and regenerators, as well as experimental data of a regenerator prototype. The models have been compared with a finitedifference method model as well as experimental data. The data are gained from the regenerator prototype presented and an absorber presented in the literature.

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“…In fact, as the typical value of coefficient of performance (COP) for vapor compression systems is between 2 to 3 [6], combining these systems with any type of renewable energy resources can certainly increase their COP. To this end, it has been found that the electric compression and absorption systems have very high energy saving potential when utilizing the availability of solar energy [7].…”

mentioning

confidence: 99%

Modeling and experimental validation of a solar-assisted direct expansion air conditioning system

Vakiloroaya

Skibniewski

2013

Energy and Buildings

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Continuous increase in global electricity consumption, environmental hazards of pollution and depletion of fossil fuel resources have brought about a paradigm shift in the development of ecofriendly and energy-efficient technologies. This paper reports on an experimental study to investigate the inherent operational characteristics of a new direct-expansion air conditioning system combined with a vacuum solar collector. Mathematical models of the system components are firstly derived and then validated against experimental results. To investigate the potential of energy savings, the hybrid solar-assisted air-conditioner is installed and extensively equipped with a number of sensors and instrumentation devices, for experimentation and data collection. The influence on the system energy usage of the average water temperature, storage tank size and room set-point temperature are then analyzed. Once the air-conditioned room has achieved its desired temperature, the compressor turns off while the cooling process still continues until the refrigerant pressure no longer maintains the desired temperature. The advantages of the proposed hybrid system rest with the fact that the compressor can remain off in a longer period by heat impartation into the refrigerant via the water storage tank. Results show an average monthly energy saving of about between 25% and 42%. AbstractContinuous increase in global electricity consumption, environmental hazards of pollution and depletion of fossil fuel resources have brought about a paradigm shift in the development of ecofriendly and energy-efficient technologies. This paper reports on an experimental study to investigate the inherent operational characteristics of a new direct-expansion air conditioning system combined with a vacuum solar collector. Mathematical models of the system components are firstly derived and then validated against experimental results. To investigate the potential of energy savings, the hybrid solar-assisted air-conditioner is installed and extensively equipped with a number of sensors and instrumentation devices, for experimentation and data collection. The influence on the system energy usage of the average water temperature, storage tank size and room set-point temperature are then analyzed. Once the air-conditioned room has achieved its desired temperature, the compressor turns off while the cooling process still continues until the refrigerant pressure no longer maintains the desired temperature. The advantages of the proposed hybrid system rest with the fact that the compressor can remain off in a longer period by heat impartation into the refrigerant via the water storage tank. Results show an average monthly energy saving of about between 25% and 42%.Keywords: energy saving, solar-assisted air conditioner, modeling, experimental validation, performance prediction. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47...

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Recent advances in building air conditioning systems

Cited by 64 publications

References 18 publications

Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Absorberand Regenerator Models for Liquid Desiccant Air Conditioning Systems: Validation and Comparison Using Experimental Data

Modeling and experimental validation of a solar-assisted direct expansion air conditioning system

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