A review on the operational instability of vapor compression system

2021 ◽  
Vol 122 ◽  
pp. 97-109
Author(s):  
Yudong Xia ◽  
Qiang Ding ◽  
Nijie Jing ◽  
Aipeng Jiang ◽  
Xuejun Zhang ◽  
...  
Keyword(s):  
Vapor Compression ◽  
Compression System ◽  
Vapor Compression System

An Experimental Investigation on Vapor Compression Refrigeration System Cascaded with Ejector Refrigeration System

2021 ◽  
pp. 2150028
Author(s):  
Vikas Kumar ◽  
Gulshan Sachdeva ◽  
Sandeep Tiwari ◽  
Parinam Anuradha ◽  
Vaibhav Jain
Keyword(s):  
Experimental Investigation ◽  
Thermal Equilibrium ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Vapor Compression ◽  
Refrigeration System ◽  
Compression System ◽  
Vapor Compression System ◽  
Vapor Compression Refrigeration ◽  
Cascaded System

A conventional vapor compression refrigeration system (VCRS) cascaded with a heat-assisted ejector refrigeration system (ERS) has been experimentally analyzed. Cascading allows the VCRS to operate at lower condenser temperatures and thus achieve a higher coefficient of performance. In this cascaded system, the condenser of the vapor compression system does not dissipate its heat directly to the evaporator of the ERS; instead, water circulates between the condenser of VCRS and the evaporator of ERS to exchange the heat. Seven ejectors of different geometries have been used in the ERS; however, all the ejectors could not maintain thermal equilibrium at the desired operating conditions. The compressor of the cascaded VCRS consumed 1.3 times less power than the noncascaded VCRS. Furthermore, the cascaded system provided a maximum 87.74% improvement in COP over the noncascaded system for the same operating conditions. The performance of the system remained constant until the critical condenser pressure of the ERS.

Experimental Investigation of Ejector-Assisted Vapor Compression System

2019 ◽  
Vol 27 (03) ◽  
pp. 1950029
Author(s):  
Vikas Kumar ◽  
Gulshan Sachdeva
Keyword(s):  
Capillary Tube ◽  
Area Ratio ◽  
Coefficient Of Performance ◽  
Vapor Compression ◽  
Evaporator Temperature ◽  
Compression System ◽  
Wide Range ◽  
Expansion Valve ◽  
Maximum Improvement ◽  
Vapor Compression System

The performance of an ejector as an expansion device rather than the conventional expansion valve or capillary tube in a vapor compression system is experimentally analyzed. Experiments have been conducted using 28 ejectors of different dimensions at the same condenser and evaporator temperatures, and it has been observed that for utmost performance, an optimum area ratio of the ejector is required. One of the ejector geometry has been experimented further for a wide range of condenser and evaporator temperatures. The coefficient of performance is found to be enhanced by at least 10% in comparison to the conventional vapor compression system for the considered range of condenser and evaporator temperatures and the maximum improvement in COP obtained is 12.83% at 14.3∘C evaporator temperature and 32.4∘C condenser temperature with 17.9211 ejector area ratio. The refrigerant R134a has been used as the working substance.

Analysis of an evaporator-condenser-separated mechanical vapor compression system

2013 ◽  
Vol 22 (2) ◽  
pp. 152-158 ◽  
Author(s):  
Hong Wu ◽  
Yulong Li ◽  
Jiang Chen
Keyword(s):  
Vapor Compression ◽  
Compression System ◽  
Vapor Compression System

A New Approach to Exergy Analyses of a Hybrid Desiccant Cooling System Compares to a Vapor Compression System

2011 ◽  
Vol 110-116 ◽  
pp. 2163-2169
Author(s):  
S. Khosravi ◽  
Yat Huang Yau ◽  
T.M.I. Mahlia ◽  
M.H. Saidi
Keyword(s):  
Indoor Air ◽  
Cooling System ◽  
Vapor Compression ◽  
Cooling Systems ◽  
New Approach ◽  
Compression System ◽  
Humid Condition ◽  
Economical System ◽  
Vapor Compression System ◽  
Exergy Analyses

In the recent researches HVAC with a based desiccant dehumidifier with a low ambient impact is more efficient in comparison to the traditional systems. Hybrid desiccant cooling systems can be used to control indoor air quality in buildings. This paper presents an integrated energy, entropy and exergy analysis of a hybrid desiccant cooling system compare to a compression system based on first and second laws of thermodynamic. The main objective is the use of a method called exergy costing applied to a conventional compression system that has been chosen to provide the proper conditioned air for a building in hot and humid condition. By applying the same method for the equivalent hybrid cooling system and finding the same exergy costing parameters, two systems can be in comparison to find the more economical system. The result illustrated hybrid desiccant cooling system can be providing 19.78% energy saving and 14.5% cheaper than the compression system the same capacity and lifetime. Nomenclature:

Performance Study of Water Harvesting Unit Working Under Iraqi Conditions

2019 ◽  
Vol 27 (01) ◽  
pp. 1950011 ◽  
Author(s):  
Ali J. Talib ◽  
Abdul Hadi N. Khalifa ◽  
Ahmed Q. Mohammed
Keyword(s):  
Water Vapor ◽  
Power Consumption ◽  
Flow Rate ◽  
Volume Flow Rate ◽  
Volume Flow ◽  
Water Harvesting ◽  
Water Production ◽  
Vapor Compression ◽  
Compression System ◽  
Vapor Compression System

The scarcity of water facing the world is one of the biggest challenges of this century. This challenge requires research plans in the field of water desalination that is not suitable for human use or the harvesting of water from the air. In this work, the performance of the water harvesting unit from the ambient air is studied. For this purpose, a vapor compression system is designed and built, a 372[Formula: see text]W reciprocating compressor is selected depending on the use of a small family consisting of four persons. The components of the vapor compression system are designed depending on the compressor power. The unit evaporator is modified to condensate the water vapor associated with the air instead of cooling the air. The effect of volume flow rate of air across the evaporator is studied. The range of air volume flow rate is from 224 to 244[Formula: see text]m3/h, as well as the operation mode of the unit which either continues to condensate or freeze the water vapor on the evaporator is also studied. The result showed that the water harvesting unit can work at a relative humidity as low as about 20%. The maximum water production for the unit is 7.9[Formula: see text]l/day with a power consumption of 1.76[Formula: see text]kW-h/l at the volume flow rate of air is 230[Formula: see text]m3/h. When an evaporative cooler is turned on in the test chamber, the amount of water production increases to about 13.11[Formula: see text]l/day with a power consumption of 1.068[Formula: see text]kW-h/l, for the same volume flow rate of air mentioned above.

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