scholarly journals Experimental Analysis on Solid Desiccant Used in An Air Conditioning

2019 ◽  
Vol 130 ◽  
pp. 01007
Author(s):  
Ekadewi Anggraini Handoyo ◽  
Andriono Slamet ◽  
Muhammad Danang Birowosuto
Keyword(s):  
Silica Gel ◽  
Electricity Consumption ◽  
Air Cooling ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Commercial Building ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration ◽  
Closed Door ◽  
Consumption Saving

Garden by The Bay in Singapore is the world’s largest coolest conservatories. Although it is located in tropics and uses so many glasses, its electricity consumption is as much as a commercial building. The key to this low consumption is in air cooling technology. Air used for cooling the conservatories is dehumidified first using liquid desiccants before cooled. The same technology was implemented to a single-split air conditioner (AC) that works on a vapor-compression refrigeration cycle. The experiments were conducted in a room with opened and closed door. Instead of using a liquid desiccant, the experiment used a solid desiccant, i.e., silica gel which thickness was 6 mm and 8 mm with density equals to 1.27 gr cm–3. From the experiment, it is found that: (i) the thicker the silica gel, the higher outlet air temperature from silica gel, (ii) less condensate will be produced when the silica gel used is thicker, (iii) silica gel is suitable for reducing humidity of outdoor/fresh air, and (iv) the electricity consumption saving for inserting 8 mm silica gel is only 4 % when the door is closed and 31 % when the door is opened.

scholarly journals Energy, Exergy and Anergy Analysis of Vertical Split Air Conditioner Under experimental ON-OFF Cycling

2019 ◽  
Vol 25 (7) ◽  
pp. 1-20
Author(s):  
Yasser Abdul Lateef Ghani ◽  
Abdul Hadi N. Khalifa
Keyword(s):  
Air Conditioning ◽  
Refrigeration Cycle ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Labview Software ◽  
Energy Flows ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration ◽  
Arduino Microcontroller

A time series analysis can help to observe the behavior of the system and specify the system faults. In addition, it also helps to explain the various energy flows in the system and further aid in reducing the thermodynamic losses. The intelligent supervisory LabVIEW software can monitor the incoming data from the system by using Arduino microcontroller and calculates the important parameters. Energy, exergy, and anergy analysis present in this paper to investigate the system performance as well as its components. To accomplish this, a 4-ton vertical split air conditioner based on vapor compression refrigeration cycle charged with refrigerant R-22 was modified for experimental analysis. The results showed that during 5400 secs of experimental study, the system shut down once by the software for 5 min. The volumetric and isentropic efficiencies of the compressor were 79.85 % and 64.48 % respectively. The maximum entropy generation was due to the compressor of 3.4 W/K while the maximum anergy was due to the condenser of 1.39 kW. The exergy efficiencies of the compressor, condenser, and the evaporator were 73.57, 40.18, and 47.45 % respectively. The system and Carnot COP were 2.53 and 4.9 respectively. The exergy efficiency of the air conditioning system was 48.7 %.  

Enhancing Air Conditioning Performance Using TiO2 Nanoparticles in Compressor Lubricant

2015 ◽  
Vol 1125 ◽  
pp. 556-560 ◽  
Author(s):  
Sumeru ◽  
Triaji P. Pramudantoro ◽  
Farid Nasir Ani ◽  
Henry Nasution
Keyword(s):  
Air Conditioning ◽  
High Pressures ◽  
Cooling Capacity ◽  
Input Power ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Air Conditioners ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration

Most air conditioners utilize vapor compression refrigeration cycle in their operation. In this cycle, the compressor is deployed to circulate the refrigerant from low to high pressures. Lubrication is an important aspect in the compressor to lubricate internal parts. Due to their remarkable properties in the thermo-physical and heat transfer capabilities, nanoparticles have prospect to be applied in the refrigeration and air conditioning system. The reliability and solubility nanoparticle of TiO2 in refrigeration systems have been investigated by several by several researchers. By introducing TiO2 nanoparticle in the lubricant, the friction coefficient and input power of the compressor can be decreased. An air conditioner with cooling capacity of 2.5 kW is utilized in the experiment. Five different concentrations of nanoparticle in the lubricant, viz.: 0.1, 0.2, 0.4, 0.5 and 0.6 gram of TiO2 in one liter of lubricant were mixed using a magnetic stirrer. After 10 days, TiO2 nanoparticles in the lubricant were observed its solubility. Furthermore, based on their solubility, TiO2 nanoparticle with concentration of 0.2 g/L was selected in the experiments. The results show that the air conditioner using R290 with TiO2 nanoparticle in the lubricants works normally and the input power of the air conditioner decreases about 3.1% and the cooling capacity and the COP increase about 5.1% and 8.4%, respectively, compared to the system without nanoparticle in the lubricant.

scholarly journals Two-Stage Evaporative Inlet Air Gas Turbine Cooling

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1382
Author(s):  
Obida Zeitoun
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Evaporative Cooling ◽  
Air Cooling ◽  
Vapor Compression ◽  
Two Stage ◽  
Turbine Cooling ◽  
Riyadh City ◽  
Vapor Compression Refrigeration ◽  
Gas Turbine Cooling

Gas turbine inlet air-cooling (TIAC) is an established technology for augmenting gas turbine output and efficiency, especially in hot regions. TIAC using evaporative cooling is suitable for hot, dry regions; however, the cooling is limited by the ambient wet-bulb temperature. This study investigates two-stage evaporative TIAC under the harsh weather of Riyadh city. The two-stage evaporative TIAC system consists of indirect and direct evaporative stages. In the indirect stage, air is precooled using water cooled in a cooling tower. In the direct stage, adiabatic saturation cools the air. This investigation was conducted for the GE 7001EA gas turbine model. Thermoflex software was used to simulate the GE 7001EA gas turbine using different TIAC systems including evaporative, two-stage evaporative, hybrid absorption refrigeration evaporative and hybrid vapor-compression refrigeration evaporative cooling systems. Comparisons of different performance parameters of gas turbines were conducted. The added annual profit and payback period were estimated for different TIAC systems.

Modeling of a Transcritical Carbon Dioxide Vapor Compression Cycle: Validation and the Effect of Refrigerant Pressure Drop on Cycle Performance

2001 ◽  
Author(s):  
Douglas M. Robinson ◽  
Eckhard A. Groll
Keyword(s):  
Carbon Dioxide ◽  
Pressure Drop ◽  
Heat Transfer Analysis ◽  
Cycle Performance ◽  
Air Conditioner ◽  
Vapor Compression ◽  
Cycle Model ◽  
Vapor Compression Refrigeration Cycle ◽  
Component Models ◽  
The Impact

Abstract Due to world wide restrictions on the use of fluorocarbon based refrigerants, carbon dioxide has recently received attention as a possible replacement for those refrigerants in certain applications. In order to evaluate the potential performance of a transcritical vapor compression refrigeration cycle using carbon dioxide as the refrigerant, a cycle model has been developed which can simulate the operation of a carbon dioxide based air conditioner. This model is called ACCO2 and includes a detailed heat transfer analysis of the heat exchangers, accounting for the effect of both thermodynamic and thermophysical properties of carbon dioxide, as well as other component models. ACCO2 simulates the operation of a carbon dioxide based air conditioner that uses air as the heat source and heat sink. An overview of component models and the methodology to combine them into an overall cycle model (ACCO2) is presented. ACCO2 was validated using experimental data and data from another validated air conditioner model. During validation, it was noted that the accuracy of refrigerant pressure drop prediction had a strong influence on the accuracy of the prediction of overall cycle performance. In addition, conclusions were drawn concerning the impact of refrigerant pressure drop in an actual carbon dioxide based air conditioner. Conclusions are also drawn concerning the validation and future uses for ACCO2.

scholarly journals Parametric analysis of a combined ejector-vapor compression refrigeration cycle

2020 ◽  
Vol 15 (3) ◽  
pp. 398-408
Author(s):  
I Ouelhazi ◽  
Y Ezzaalouni ◽  
L Kairouani
Keyword(s):  
Current Model ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Refrigeration Cycle ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Entrainment Ratio ◽  
Constant Area ◽  
Vapor Compression Refrigeration Cycle ◽  
Vapor Compression Refrigeration

Abstract From the last few years, the use of efficient ejector in refrigeration systems has been paid a lot of attention. In this article a description of a refrigeration system that combines a basic vapor compression refrigeration cycle with an ejector cooling cycle is presented. A one-dimensional mathematical model is developed using the flow governing thermodynamic equations based on a constant area ejector flow model. The model includes effects of friction at the constant-area mixing chamber. The current model is based on the NIST-REFPROP database for refrigerant property calculations. The model has basically been used to determine the effect of the ejector geometry and operating conditions on the performance of the whole refrigeration system. The results show that the proposed model predicts ejector performance, entrainment ratio and the coefficient of performance of the system and their sensitivity to evaporating and generating temperature of the cascade refrigeration cycle. The simulated performance has been then compared with the available experimental data from the literature for validation.

Sign in / Sign up

Export Citation Format

Share Document