scholarly journals Performance investigation of a novel hybrid deep-dehumidification process using liquid desiccant

2019 ◽  
Vol 111 ◽  
pp. 01047
Author(s):  
Bowen Guan ◽  
Jun Liu ◽  
Xiaohua Liu ◽  
Tao Zhang ◽  
Liangliang Chen ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
System Performance ◽  
Air Conditioning ◽  
Cooling Capacity ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Air Conditioning System ◽  
Heating Capacity ◽  
Flow Through

As one of the essential dehumidification ways, liquid desiccant air conditioning system has developed quickly in recent years, especially in the deep dehumidification field. A novel hybrid deep- dehumidification system using liquid desiccant driven by heat pump is proposed in this study to simplify the arrangement of air ducts and guarantee a competitive energy efficiency. In the proposed process, the regenerator, condensing dehumidifier and liquid dehumidifier are cascaded, and the process air flow through them sequentially. Heat pump cycle is utilized in the system, where the cooling capacity of evaporator is used to cool the liquid desiccant in dehumidifier, and the heating capacity of condenser is used for desiccant regeneration. The humidity ratio of the supplied air is as low as 2.6 g/kg. No extra regeneration air or corresponding air duct are needed in the proposed process, which obviously simplifies the layout of the system. Performance of the proposed system is then analysed by numerical results. It’s indicated 17.5~29.2% energy is saved compared with the conventional deep dehumidification process with two-stage heat pump, with the outlet humidity ratio of 2.6 g/kg.

scholarly journals Heat pump air conditioning system for pure electric vehicle at ultra-low temperature

2014 ◽  
Vol 18 (5) ◽  
pp. 1667-1672 ◽  
Author(s):  
Hai-Jun Li ◽  
Guang-Hui Zhou ◽  
An-Gui Li ◽  
Xu-Ge Li ◽  
Ya-Nan Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Vehicle ◽  
Heat Pump ◽  
Air Conditioning ◽  
Heating System ◽  
Experimental Results ◽  
Air Conditioning System ◽  
Discharge Temperature ◽  
Heating Capacity ◽  
Environment Temperature

When the ordinary heat pump air conditioning system of a pure electric vehicle runs at ultra-low temperature, the discharge temperature of compressor will be too high and the heating capacity of the system will decay seriously, it will lead to inactivity of the heating system. In order to solve this problem, a modification is put forward, and an experiment is also designed. The experimental results show that in the same conditions, this new heating system increases more than 20% of the heating capacity; when the outside environment temperature is negative 20 degrees, the discharge temperature of compressor is below 60 degrees.

scholarly journals Modeling and Simulation of Heat Pump Air-Conditioning System using Ecofriendly Refrigerants

2021 ◽  
Vol 9 (VI) ◽  
pp. 1166-1170
Author(s):  
Ajay Landage
Keyword(s):  
Energy Efficiency ◽  
Comparative Analysis ◽  
Physical Properties ◽  
Heat Pump ◽  
Air Conditioning ◽  
Coefficient Of Performance ◽  
Simulation Approach ◽  
Alternative Refrigerants ◽  
Air Conditioning System ◽  
Selection Of

A simulation approach to heat pump systems is proposed in this paper. The evaluation of working fluids is conducted. Moreover, the selected refrigerants are used in the simulation. Subsequently, the system is analyzed in terms of the coefficient of performance (COP) and energy efficiency. Some alternative refrigerants, instead of R22 used R290 refrigerent. It is described the selection of refrigerants adapted to each utilization, based on the thermodynamic and -physical properties, the technological behaviour, costs and use constraints as principal aspects of the environmental protection. Also, it is performed a comparative analysis in function of the total equivalent warming impact (TEWI) for some possible substitutes of refrigerant R22 used in various refrigeration and heat pump systems.

Performance Study of DC Compressor for Automotive Air Conditioning System

2012 ◽  
Vol 614-615 ◽  
pp. 674-677
Author(s):  
Nasution Henry ◽  
M.H.Z. Yamani ◽  
K. Sumeru
Keyword(s):  
Energy Efficiency ◽  
Direct Current ◽  
Electric Motor ◽  
Air Conditioning ◽  
Engine Speed ◽  
Cooling Capacity ◽  
Performance Study ◽  
Air Conditioning System ◽  
Automotive Air Conditioning ◽  
Automotive Air Conditioning System

The automotive air conditioning compressor (AAC) is belt-driven by the engine. The compressor speed is directly proportional to the engine speed. Therefore, the cooling capacity will vary as the engine speed changes. To meet the air conditioning (AC) demand, the compressor continually cycles on and off. In the research, the compressor of the AAC is driven by an electric motor which in turn is operated by electrical battery (12 volt). The use of direct current compressor (DCC) is seen as a solution of the existing system. Using the proposed system, DCC gets significant improvements in energy efficiency. Compared with AAC system, the energy conservation effect is about 77.5% to 86.35%.

scholarly journals Experimental Thermodynamic Investigation on the Refrigerant Charge in a Transcritical CO2 Electric Bus Air Conditioning System

2021 ◽  
Vol 11 (12) ◽  
pp. 5614
Author(s):  
Haidan Wang ◽  
Shengbo Li ◽  
Yulong Song ◽  
Xiang Yin ◽  
Feng Cao ◽  
...  
Keyword(s):  
System Performance ◽  
Air Conditioning ◽  
Cooling Capacity ◽  
Exergy Efficiency ◽  
Coefficient Of Performance ◽  
Air Conditioning System ◽  
Electric Bus ◽  
Maximum Coefficient ◽  
Considerable Impact ◽  
Air Conditioning Systems

Due to its considerable impact on climate, bus air conditioning systems are being pushed to take a new and sustainable path. Electric buses relying on transcritical CO2 air conditioning units are perceived to be eco-friendly and future-proof solutions to achieving such a target. However, in order to have highly efficient air conditioning systems, the CO2 charge needs to be optimized. In this paper the energy and exergy-based analyses were performed to investigate the effect of normalized refrigerant charge on the system performance by using a test rig of a transcritical CO2 air conditioning unit for an 8 m electric bus. Results showed that the normalized refrigerant charge range of 0.248~0.336 was recommended in order to ensure the maximum coefficient of performance (COP). In addition, in sufficient charge conditions, the optimal COP, cooling capacity and exergy efficiency were 1.716, 18.97 kW and 29.79%, respectively, under the standard refrigeration condition of 35 °C/27 °C. As the ambient temperature rose from 35 °C to 40 °C, the COP, cooling capacity and exergy efficiency decreased by 16.03%, 10.90% and 12.22%, respectively. Furthermore, the exergy efficiency was found not to be sensitive to slightly insufficient charge, whereas overcharge was observed to be even beneficial to exergy efficiency under the condition of ensuring the maximum COP. In addition, insufficient refrigerant charging seriously affected the irreversible losses in the indoor and outdoor heat exchangers, whereas slight overcharge had little effect on the component exergy efficiency. Finally, the need to improve the CO2 compressor efficiency to enhance the system performance was revealed.

Study on Noncondensing Air-Conditioning System Performance When Combining a Desiccant Cooling System with a CO2 Heat Pump

2006 ◽  
Vol 12 ◽  
pp. 917-933 ◽  
Author(s):  
Yaw-Shyan Tsay ◽  
Shinsuke Kato ◽  
Ryozo Ooka ◽  
Makoto Koganei ◽  
Kousaku Nishida ◽  
...  
Keyword(s):  
Heat Pump ◽  
System Performance ◽  
Air Conditioning ◽  
Cooling System ◽  
Air Conditioning System

Mathematical Modeling for the Regenerator of Liquid Desiccant Air-Conditioning System

2013 ◽  
Vol 465-466 ◽  
pp. 226-231
Author(s):  
Majid Ali Wassan ◽  
Khairul Habib ◽  
Suhaimi B. Hassan
Keyword(s):  
Mathematical Model ◽  
Air Conditioning ◽  
Flow Direction ◽  
Model Performance ◽  
Dilute Solution ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Counter Flow ◽  
Air Conditioning System ◽  
Flow Configuration

T his paper presents mathematical model for regenerator of liquid desiccant air conditioning system. Regression analysis was used to get the relation between enthalpy and humidity ratio. Performance of regenerator is highly affected by varying the flow direction between air & desiccant thus to get proper regeneration results counter-flow configuration is considered. Previous studies show better regeneration results for counter-flow direction of air to desiccant. Validation is done by comparing results of present study the experimental results of previous studies and comparison was found to be quite satisfactory. Based on above mathematical model performance of regenerator was analyzed. The purpose of this research was regeneration of liquid desiccant from its dilute-solution form to strong-solution.

Comparison and Selection of HVAC Schemes for Weihai Baidu City

2011 ◽  
Vol 374-377 ◽  
pp. 681-684
Author(s):  
Yan Peng Wu ◽  
Hai Shan Xia
Keyword(s):  
Energy Efficiency ◽  
Energy Saving ◽  
Heat Pump ◽  
Air Conditioning ◽  
Second Phase ◽  
Air Conditioning System ◽  
Air Source Heat Pump ◽  
Pipe Networks ◽  
Time Part ◽  
Selection Of

The second phase of Weihai Baidu City project plans to become a three-star certificated program which is labled by China’s enviromental building evaluation. Heating and ventilated air conditioning program is one of the most important aspects in evaluation of energy saving. Feasibility study on GSHP, GWHP, air-source heat pump, seawater source heat pump were carried out, it’s confirmed that the most energy-saving and reliable way is that using municipal pipe networks for heating in winter and using split air conditioning or multi-connected air-conditioning system in summer. Summer air-conditioning adopts the new idea “part of time, part of space", representative the latest concept of energy efficiency in buildings in China.

scholarly journals Experimental study on the thermal performance of an air conditioning system in a pure electric vehicle

2021 ◽  
pp. 93-93
Author(s):  
Enhai Liu ◽  
Haijun Li ◽  
Yajun Gong ◽  
Yuping Wei ◽  
Haifei Chen
Keyword(s):  
Experimental Study ◽  
Electric Vehicle ◽  
Heat Pump ◽  
Thermal Performance ◽  
Air Conditioning ◽  
Air Conditioning System ◽  
Factors Affecting ◽  
Discharge Temperature ◽  
Heating Capacity ◽  
Main Factors

This paper studies the thermal performance of an air conditioning system in a pure electric vehicle. An experiment is designed to examine the main factors affecting the performance, and the experimental results show that a heat pump with a low-pressure gas-mixing system can increase the heating capacity and decrease the discharge temperature.

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