scholarly journals Experimental Study of Hybrid Solar Air Conditioning System in Iraq

2018 ◽  
Vol 24 (10) ◽  
pp. 32 ◽  
Author(s):  
Ahmed Abd Mohammed ◽  
Raed Ayad Abduljabbar
Keyword(s):  
Experimental Study ◽  
Power Consumption ◽  
Ambient Temperature ◽  
Storage Tank ◽  
Air Conditioning ◽  
Average Power ◽  
Coefficient Of Performance ◽  
Air Conditioning System ◽  
Average Power Consumption ◽  
Average Coefficient

In this paper, an experimental study of the thermal performance for hybrid solar air conditioning system was carried out, to investigate system suitability for the hot climate in Iraq. The system consists of vapor compression unit combined with evacuated tube solar collector and liquid storage tank. A three-way valve was installed after the compressor to control the direction flow of the refrigerant, either to the storage tank or directly to the condenser. The performance parameters were collected by data logger to display and record in the computer by using LabVIEW software. The results show that the average coefficient of performance of hybrid solar air conditioning system (R=1) was about 2.42 to 2.77 and the average power consumption was about 1.1 to 1.12 kW when the ambient temperature was about 34.2 to 39.7 ˚C, while the average coefficient of performance of conventional system (R=0) was about 3.23 and the average power consumption was about 1 kW when the ambient temperature was about 30.8 to 34.3 ˚C. It can be concluded that the use of the hybrid solar system in Iraq with its current form could not be saved electricity.  

Performance Comparison among Heat Pump Water Heaters Working with R32, R134a and the Mixture of R32/R134a

2012 ◽  
Vol 512-515 ◽  
pp. 1295-1298
Author(s):  
De Feng Ding ◽  
Shi Jie Liu ◽  
Chao Yu Zheng ◽  
Wen Sheng Yu ◽  
Wu Chen
Keyword(s):  
Power Consumption ◽  
Heat Pump ◽  
Average Power ◽  
Input Power ◽  
Performance Comparison ◽  
Coefficient Of Performance ◽  
Water Heater ◽  
Heat Pump Water Heater ◽  
Discharge Temperature ◽  
Average Power Consumption

A general air-source heat pump water heater originally designed to work with R134a was reconstructed as experimental rig for performance studies on systems using different refrigerants including R32, R134a and the mixture of R32/R134a which mass ratio is 1:5. Experimental results showed that the power consumption of the heat pump water heater charged individually with R32 would greatly exceed the system’s original pre-set maximum input power. When the leaving water temperature was increased from 18°C to 58°C, the average discharge temperature of the heat pump charged with R32/R134a mixture was 13.6% higher than that with R134a. The average power consumption of the heat pump with R134a was 253.5W less than that with R32/R134a mixture. However, the average COP (Coefficient of Performance) obtained by that with R32/R134a mixture was 0.83 higher than that with R134a.

DEVELOPMENT AND EVALUATION OF AN AUTOMOTIVE AIR-CONDITIONING TEST RIG

2016 ◽  
Vol 78 (10-2) ◽  
Author(s):  
Ahmad Zulkhairie Amran ◽  
Zulkarnain Abdul Latiff ◽  
Henry Nasution ◽  
Mohd Rozi Mohd Perang ◽  
Hishammudin Mohd Jamil ◽  
...  
Keyword(s):  
Power Consumption ◽  
Air Conditioning ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Test Rig ◽  
Air Conditioning System ◽  
Variable Parameters ◽  
Automotive Air Conditioning ◽  
Air Flow Velocity ◽  
Compressor Power

To evaluate an air-conditioning system performance on board is quite cumbersome and tedious process due to the limitation of space in the engine compartment. This paper presents the process of designing and the result from the automotive refrigeration system simulation that have been integrated into the test rig. To perform the test on automotive refrigeration simulator the location for the temperature measurement selected and thermocouples were installed. The locations of the temperature probes are at the inlet and outlet of compressor, condenser outlet and the inlet of the evaporator. The gas pressure was measured at low and high pressure sides located at evaporator outlet and receiver-drier respectively. The test results were analyzed using the properties table of the refrigerant used. The coefficient of performance (COP), cooling load of the system and compressor power consumption were determined. The variable parameters used are the evaporator blower speed and the air velocity passes through the condenser. The experimental results obtained show that increasing the blower speed will reduce the COP of the refrigeration system. The maximum COP of the system is 4.3 at the lowest evaporator blower speed. The power consumption will be reduced when the air flow velocity through the condenser is increased from 0, 40, 50, 60, 70 km/h respectively.

scholarly journals The Optimized Energy Saving of a Refrigerating Chamber

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1887
Author(s):  
Whei-Min Lin ◽  
Chung-Yuen Yang ◽  
Ming-Tang Tsai ◽  
Hong-Jey Gow
Keyword(s):  
Power Consumption ◽  
Energy Saving ◽  
Control Strategy ◽  
Average Power ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Switching Loss ◽  
Binary Coding ◽  
Average Power Consumption ◽  
Effectiveness And Efficiency

This paper proposes a control strategy for the energy saving of refrigerating chambers. Combining binary coding and proteome reorganization, the binary proteome algorithm (BPA) is proposed to solve this problem. The refrigeration system model is firstly established based on the performance data of compressors and temperature measurements of each refrigerating chamber. The objective function is an averaged coefficient of performance (COP), which considers the switching loss of the compressors, power consumption of the compressors, and refrigerating capacity of the chambers. The control strategy is defined as an optimization problem with constraints to avoid the ineffective operation of a refrigeration system for improving the COP. BPA is adopted to solve the control strategy for optimizing energy saving. The effectiveness and efficiency of the BPA are demonstrated using a real system, and the results are compared with the original control strategy. Results show that the average power consumption drops from 115.92 kW to 108.82 kW, and the average COP value rises from 1.92 to 2.03. The proposed control strategy is feasible, robust, and more effective in energy-saving problems. Other than energy saving, the proposed control strategy also has the benefits of reducing the evaporator frost formation, which allows the products to avoid chill damage.

The Effect of Ambient Temperature on the Performance of Automotive Air-Conditioning System

2016 ◽  
Vol 819 ◽  
pp. 221-225 ◽  
Author(s):  
Hisamudin Mohd Yunus ◽  
Henry Nasution ◽  
Azhar Abdul Aziz ◽  
Sumeru ◽  
Afiq Aiman Dahlan
Keyword(s):  
Ambient Temperature ◽  
Heat Load ◽  
Air Conditioning ◽  
Engine Speed ◽  
Internal Heat ◽  
Experimental Period ◽  
Coefficient Of Performance ◽  
Air Conditioning System ◽  
Automotive Air Conditioning ◽  
Automotive Air Conditioning System

The automotive air conditioning is one of the important things to be discovered and analyses to maximize the coefficient of performance (COP). The effects of the global warming in a surrounding world give a big impact on performance of air conditioning system in the vehicle. The significant of these issues make the ambient temperature changing. The ambient temperature it’s different according to the type of the place. The different ambient temperature will effect on the performance of air conditioning system. This study will analysis the energy consumption, temperature distribution and COP at various ambient temperature (30, 35 and 40°C), internal heat load (0, 500,700 and 1000 W) and engine speed (1000, 1500 and 2000 rpm) using HFC-R134a as the refrigerant. Measurements were taken during the 30 minute experimental period for temperature set point which 21°C. The results showed that the performance of the automotive air conditioning system decreases when ambient temperature, internal heat load and compressor speed increased.

scholarly journals Research on Double-Stage and Multi-Stage Capacitive Deionization Absorption Air-Conditioning System

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 395
Author(s):  
Feng Cheng ◽  
Boqing Ding ◽  
Xiuwei Li
Keyword(s):  
Air Conditioning ◽  
Pure Water ◽  
Good Choice ◽  
Coefficient Of Performance ◽  
Capacitive Deionization ◽  
Joint Work ◽  
Thermal Regeneration ◽  
Air Conditioning System ◽  
Multi Stage ◽  
Stage System

An absorption air-conditioning system is a good choice for green buildings. It has the superiority in the utilization of renewable energy and the refrigerant is environment-friendly. However, the performance of the traditional absorption system has been restricted by the energy waste in the thermal regeneration process. Capacitive deionization (CDI) regeneration is proposed as a potential method to improve system efficiency. In the new method-based air-conditioning system, strong absorbent solutions and pure water are acquired with the joint work of two CDI units. Nevertheless, the practical CDI device is composed of a lot of CDI units, which is quite different from the theoretical model. To reveal the performance of multiple CDI units, the model of the double/multi-stage CDI system has been developed. Analysis has been made to expose the influence of some key parameters. The results show the double-stage system has better performance than the single-stage system under certain conditions. The coefficient of performance (COP) could exceed 4.5, which is higher than the traditional thermal energy-driven system, or even as competitive as the vapor compression system. More stages with proper voltage distribution better the performance. It also provides the optimization method for the multi-stage CDI system.

scholarly journals Experimental study on the effect of condensate water on the performance of split air conditioning system

2021 ◽  
Vol 7 ◽  
pp. 840-851
Author(s):  
Hua Yang ◽  
Na Pei ◽  
Liansheng Liu ◽  
Man Fan ◽  
Yue Qin
Keyword(s):  
Experimental Study ◽  
Air Conditioning ◽  
Air Conditioning System

scholarly journals A Novel Cross-Latch Shift Register Scheme for Low Power Applications

2020 ◽  
Vol 11 (1) ◽  
pp. 129
Author(s):  
Po-Yu Kuo ◽  
Ming-Hwa Sheu ◽  
Chang-Ming Tsai ◽  
Ming-Yan Tsai ◽  
Jin-Fa Lin
Keyword(s):  
Power Consumption ◽  
Supply Voltage ◽  
Electrical Power ◽  
Average Power ◽  
Leakage Power ◽  
Shift Register ◽  
Cmos Process ◽  
Average Power Consumption ◽  
Simulation Results ◽  
Layout Area

The conventional shift register consists of master and slave (MS) latches with each latch receiving the data from the previous stage. Therefore, the same data are stored in two latches separately. It leads to consuming more electrical power and occupying more layout area, which is not satisfactory to most circuit designers. To solve this issue, a novel cross-latch shift register (CLSR) scheme is proposed. It significantly reduced the number of transistors needed for a 256-bit shifter register by 48.33% as compared with the conventional MS latch design. To further verify its functions, this CLSR was implemented by using TSMC 40 nm CMOS process standard technology. The simulation results reveal that the proposed CLSR reduced the average power consumption by 36%, cut the leakage power by 60.53%, and eliminated layout area by 34.76% at a supply voltage of 0.9 V with an operating frequency of 250 MHz, as compared with the MS latch.

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