Improvement Measures and Evaluation of Energy Efficiency of Air Conditioning

2012 ◽  
Vol 468-471 ◽  
pp. 1989-1992
Author(s):  
Hong Zhang ◽  
Jia Ming Zhao
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Air Conditioning ◽  
Evaluation Criteria ◽  
Economic Benefits ◽  
Practical Significance ◽  
Efficiency Ratio ◽  
Total Energy Consumption ◽  
Refrigeration Equipment ◽  
Improvement Measures

Air conditioning and refrigeration equipment are more and more widely applied, It’s energy efficiency proportion of total energy consumption is growing. To evaluate energy efficiency and apply high grade energy efficiency of air conditioning , that can bring considerable economic benefits and improve energy-saving initiative for the enterprises. This has great practical significance to realize Chinese energy-saving task. In this paper the air conditioning energy efficiency ratio(EER), seasonal energy efficiency ratio(SEER) and integrated part load value(IPLV) are proposed and analyzed, Many evalution methods are put forword to provide appropriate evaluation criteria for enterprise, and the energy-saving measures on the different assessment criteria are also put forward, It has some guiding significance to improve the efficiency of air conditioning and refrigeration equipment.

USING WATER VAPOR AS REFRIGERANT IN MULTISTAGE VARIABLE SPEED TURBO COMPRESSOR TO IMPROVE SEASONAL ENERGY EFFICIENCY RATIO OF AIR CONDITIONING

2011 ◽  
Vol 19 (02) ◽  
pp. 131-140
Author(s):  
QUBO LI ◽  
DEMISS A. AMIBE ◽  
NORBERT MÜLLER
Keyword(s):  
Energy Efficiency ◽  
Water Vapor ◽  
Energy Demand ◽  
Air Conditioning ◽  
Electrical Energy ◽  
Coefficient Of Performance ◽  
Air Conditioner ◽  
Variable Speed ◽  
Efficiency Ratio ◽  
Part Load

An air conditioning system using water as refrigerant (R718) that compresses water vapor with multistage stage variable speed axial compressor with intercooling between stages by water injection is considered. Four stage compression with flash intercooling resulted in 50% improvement of coefficient of performance (COP) at full load compared to conventional refrigerants like R134a. The energy efficiency of an air conditioning unit is specified by seasonal energy efficiency ratio (SEER). SEER is defined as the ratio of cooling output of an air conditioner measured and electrical energy consumption as per AHRI 210/240 during cooling season. The SEER is computed after determining the evaporator cooling capacity and the electrical energy demand of the compressor at each bin temperature using assumed compressor isentropic efficiency, mechanical efficiency and electrical efficiency and multiplying by the weight of each bin temperature to determine the total for the cooling season. As a result of multistage compression, best part load performance of water as a refrigerant and operation of compressor near design point at part load due to variable speed drive, 50%–60% improvement in SEER is obtained compared to the best available in the market using conventional refrigerants such as R134a with single stage compression.

The Experiment on System Performance Comparing Analysis and Displacement between R1270 and R22

2015 ◽  
Vol 799-800 ◽  
pp. 770-773
Author(s):  
Zhi Jiang Wu
Keyword(s):  
Energy Efficiency ◽  
Heat Exchanger ◽  
Performance Optimization ◽  
System Performance ◽  
Air Conditioning ◽  
Tube Diameter ◽  
Experimental Results ◽  
Efficiency Ratio

The refrigeration circle performance of air conditioning comparing analysis and displacement between R1270 and R22 is studied in this paper. In addition, the system performance optimization of R1270 refrigeration circle is discussed.The experimental results show that the smaller tube diameter of heat exchanger for R1270 system is easy to improve the energy efficiency ratio in the unimproved system.These results are important for theory and reality to research this type of air conditioning.

scholarly journals Performance of Air Conditioning Unit under Constant Outdoor Wet-Bulb Temperature and Varied Dry-Bulb Temperature

2021 ◽  
Vol 39 (5) ◽  
pp. 1483-1490
Author(s):  
Andriyanto Setyawan ◽  
Susilawati Susilawati ◽  
Tandi Sutandi ◽  
Hafid Najmudin
Keyword(s):  
Energy Efficiency ◽  
Air Temperature ◽  
Air Conditioning ◽  
Cooling Capacity ◽  
Air Conditioner ◽  
Outdoor Air ◽  
Efficiency Ratio ◽  
Liquid Line ◽  
Discharge Temperature ◽  
Line Temperature

An experiment has been carried out for examining the performance of an air conditioning unit under constant outdoor wet-bulb temperature and varied dry-bulb temperature. During the experiment, the wet-bulb temperature of the compartment for outdoor unit was maintained at 22℃ and the dry-bulb temperature was varied from 24℃ to 36℃. The increase of outdoor air temperature results in the increase of supply air temperature, discharge temperature, suction temperature, and liquid line temperature. These cause the degradation of the air conditioner performance. An increase of power consumption by 1.4% and decrease of cooling capacity by 0.8% were observed for each 1℃ increase of outdoor air temperature. As a result, the energy efficiency ratio drops by 2% for each 1℃ increase of outdoor air temperature.

Supply Chain Optimization Audit (SCOA) for Green ICT Opportunities

2011 ◽  
pp. 559-580 ◽  
Author(s):  
Saugato Mukerji ◽  
Aditya K. Ghose
Keyword(s):  
Energy Efficiency ◽  
Supply Chain ◽  
Supply Chains ◽  
Energy Saving ◽  
Air Conditioning ◽  
Data Centers ◽  
Supply Chain Optimization ◽  
Green Ict

Green ICT is a lot more than efficient air-conditioning of data centers and switching off monitors and desktop PCs. ICT has the ability to give rise to and continuously enable energy saving on a scale 50 to 100 times bigger by becoming the technology that detects and prevents process inefficiency of energy intensive supply chains. Energy efficiency that can only be sustainably achieved as a result of using ICT creatively is outlined in this chapter. The authors consider the optimization of supply chain as a crucial enabler of the overall effort of an organization to improve its environmental credentials. Therefore, undertaking the audits of an organization’s supply chains, and ensuring that the end result improves its efficiency is one way of limiting the carbon generated during its activities.

scholarly journals Modelling and optimal energy-saving control of automotive air-conditioning and refrigeration systems

2016 ◽  
Vol 231 (3) ◽  
pp. 291-309 ◽  
Author(s):  
Yanjun Huang ◽  
Amir Khajepour ◽  
Farshid Bagheri ◽  
Majid Bahrami
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Air Conditioning ◽  
Moving Boundary ◽  
Parameter Method ◽  
Model Predictive Controller ◽  
Automotive Air Conditioning ◽  
Lumped Parameter ◽  
Proposed Model ◽  
Predictive Controller

Air-conditioning and refrigeration systems are extensively adopted in homes, industry and vehicles. An important step in achieving a better performance and a higher energy efficiency for air-conditioning and refrigeration systems is a control-based model and a suitable control strategy. As a result, a dynamic model based on the moving-boundary and lumped-parameter method is developed in this paper. Unlike existing models, the proposed model lumps the effects of the fins into two equivalent parameters without adding any complexity and considers the effect produced by the superheated section of the condenser, resulting in a model that is not only simpler but also more accurate than the existing models. In addition, a model predictive controller is designed on the basis of the proposed model to enhance the energy efficiency of the air-conditioning and refrigeration systems. Simulations and experimental results are presented to demonstrate the accuracy of the model. The experiments show that an energy saving of about 8% can be achieved by using the proposed model predictive controller compared with the conventional on–off controller under the examined scenario. The better performance of the proposed controller requires electrification of the automotive air-conditioning and refrigeration systems so as to eliminate the idling caused by running the air-conditioning and refrigeration systems when a vehicle stops.

scholarly journals Analysis on the monitoring system of energy conservation and comfort in office buildings based on internet of things

2020 ◽  
Vol 15 (3) ◽  
pp. 351-355
Author(s):  
Dongmei Li
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Internet Of Things ◽  
Energy Saving ◽  
Monitoring System ◽  
Air Conditioning ◽  
Control Method ◽  
Working Hours ◽  
Central Air Conditioning ◽  
Energy Saving Control

Abstract In order to reduce the cost of central air conditioning, we need to reduce its energy consumption. This paper briefly introduced Internet of Things and the energy-saving and comfort monitoring system of central air conditioning based on the Internet of Things. The system took comfort degree as constraint and energy efficiency as objective to control energy saving of central air conditioning. Company X in Guanghan, Sichuan, China, was taken as an example for analysis. The system was compared with the energy-saving control system which took temperature and power as constraints. Compared with before the energy-saving control, the proportion of air conditioning downtime in the working hours of employees increased after the implementation of the two kinds of energy-saving control systems, and the proportion of downtime under the energy-saving control system designed in this study was larger; in addition, after the control of the two kinds of energy-saving systems, the energy efficiency of the air conditioning significantly improved, and the air conditioning under the control of the energy-saving system proposed in this study had more improvement in energy efficiency and higher energy-saving efficiency. The energy-saving control method proposed in this study can effectively reduce the power consumption of the central air conditioning in the office.

Analysis on Energy Saving Factors and Research on Energy Efficiency Evaluation Indexes of Ventilation and Air Conditioning System in the Underground Engineering

2013 ◽  
Vol 291-294 ◽  
pp. 682-687
Author(s):  
Shi Bin Geng ◽  
Sha Sha Chen ◽  
Ming Xing Xiao
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Air Conditioning ◽  
Water System ◽  
Efficiency Evaluation ◽  
Underground Engineering ◽  
Air Conditioning System ◽  
Evaluation Indexes ◽  
Heat System ◽  
Energy Efficiency Evaluation

This paper makes comprehensive analysis on energy saving factors of ventilation and air conditioning system in the underground engineering mainly from five aspects ,such as the overall scheme, cold - heat system, air system, water system and operation management . And based on this, furthermore, each energy saving factor is quantified , the energy efficiency evaluation indexes of each subsystem is studied .So that it provides a concrete and feasible evaluation index and its basic calculation method for energy-saving evaluation, diagnosis of energy saving and energy saving reconstruction work.

scholarly journals Evaluasi Penggunaan Listrik dengan Metode Konservasi Energi untuk Efisiensi Energi di Gedung FKIP UNTIRTA

2020 ◽  
Vol 12 (1) ◽  
pp. 11-21
Author(s):  
Fahrizal Tunjung Kresnadi
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Electrical Energy ◽  
Energy Audit ◽  
Building Area ◽  
Led Lights ◽  
Consumption Intensity ◽  
Area Data

Knowing the level of intensity of energy consumption (IKE) in the FKIP Untirta building using the energy audit method for achieving energy efficiency. The data used in data collection in the form of electricity usage data, building area data and observations made by researchers. Analysis of the data used in this study is to use the formula of energy consumption intensity. The results showed the IKE value of the CB FKIP Untirta building was 254.5 kWh/m2. With these results, it can be seen that the IKE value in the CB FKIP Untirta building is still inefficient. This is based on ASEAN-USAID parameters which range at 240 kWh/m2. Based on electrical energy consumption in the CB FKIP Untirta building there is an opportunity for energy saving or energy saving solutions that are replacing TL lamps with Led lights or by replacing TL lamps that are smaller watts and in terms of air conditioning or air conditioning load replacing R32 refrigerant with R32 refrigerant mixture and The R290 has proven to be quite efficient in terms of savings and energy efficiency. And the duration of use of electrical energy.

scholarly journals Energy Efficiency Ratio (EER) of Novel Air Conditioning System on LPG Fuelled Vehicle: A Lab-Scale Investigation

2019 ◽  
Vol 16 (3) ◽  
pp. 7133-7143
Author(s):  
Muji Setiyo ◽  
Budi Waluyo ◽  
Paolo Gobbato ◽  
Massimo Masi
Keyword(s):  
Energy Efficiency ◽  
Air Conditioning ◽  
Alternative Fuels ◽  
Road Transport ◽  
Intake Manifold ◽  
Cooling Power ◽  
Efficiency Ratio ◽  
Passenger Cars ◽  
Air Conditioning System ◽  
The Impact

Alternative fuels have become an effective solution to reduce the impact of road transport on the environment. On the other hand, the growing uses of air-conditioning (AC) have contributed to worsening the fuel economy of passenger vehicles. Liquid petroleum gas (LPG), if injected in the gaseous phase to power SI engines, may allow reducing the fuel consumption due to AC devices through the recovery of cooling energy from the fuel systems. This paper presents lab-scale tests of an air conditioning system prototype for LPG-fuelled vehicles. The prototype has been assembled using standard vehicle components to quantify the cooling energy recoverable from the LPG evaporation before the fuel is injected into the engine intake manifold. Temperature and humidity of the air exiting the LPG evaporator are measured for fuel mass flow rates typical of light-duty vehicles. The energy efficiency ratio (EER) of the prototype achieves 2.72 when cooling power equals 1.2 kW. Although the system tested needs improvements, the experimental data show that the cooling energy recovered by LPG evaporation can significantly reduce the power consumption of standard AC systems in passenger cars.

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