Energy saving assessment of a desiccant-enhanced evaporative cooling system in variable air volume applications

2017 ◽  
Vol 117 ◽  
pp. 94-108 ◽  
Author(s):  
Sung-Joon Lee ◽  
Hui-Jeong Kim ◽  
Hye-Won Dong ◽  
Jae-Weon Jeong
Keyword(s):  
Energy Saving ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Variable Air Volume ◽  
Air Volume ◽  
Evaporative Cooling System

scholarly journals The Analysis of Cooling Time and Energy Consumption of VAV Fan-pad Evaporative Cooling Systems in a Greenhouse

HortScience ◽  
2020 ◽  
Vol 55 (6) ◽  
pp. 812-818
Author(s):  
Zhixiong Zeng ◽  
Jiaming Guo ◽  
Xinyu Wei ◽  
Enli Lü ◽  
Yanhua Liu
Keyword(s):  
Energy Consumption ◽  
Crop Production ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Energy Output ◽  
Temperature Zone ◽  
Indoor Temperature ◽  
Variable Air Volume ◽  
Evaporative Cooling System ◽  
Specific Temperature

Mechanical ventilation systems are applied in greenhouses for temperature adjustment, but they consume a large amount of energy. This research aims to optimize the energy consumption of a variable air volume (VAV) fan-pad evaporative cooling system via experimentation. We discuss the effects of adjusting the VAV fan-pad evaporative cooling system on temperature and humidity, and we provide an estimate of the corresponding energy consumption under different highest stable temperature conditions. The test results demonstrate that a higher fan frequency is typically accompanied by greater ventilation quantity, faster cooling speed, more pronounced effects of the fan-pad evaporative cooling system fan, and more intensive energy consumption during the cooling process compared with a low fan frequency. When the temperature increased for 71 seconds or 60 seconds in a specific temperature zone (34 to 35 °C), the indoor temperature could be reduced to the optimum for crops with a fan frequency of 20 Hz, saving more than 87% of the energy output. When the warm-up time for a specific temperature zone (34 to 35 °C) was 41 seconds, the indoor temperature could be reduced to the optimum temperature for crops only when the fan frequency was 50 Hz. The VAV fan-pad evaporative cooling system increased the relative humidity in the greenhouse to satisfy crop production demands. The temperature of crops shared the same variation trend as temperatures inside the greenhouse. Our research results theoretically benefit cooling control and energy-saving design of greenhouses in the subtropics.

scholarly journals The Analysis for Energy Consumption of Marine Air Conditioning System Based on VAV and VWV

2018 ◽  
Vol 38 ◽  
pp. 04012
Author(s):  
Sai Feng Xu ◽  
Xing Lin Yang ◽  
Zou Ying Le
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Water Volume ◽  
Pump System ◽  
Air Conditioning System ◽  
Variable Air Volume ◽  
Air Volume ◽  
Marine Air ◽  
Variable Water

For ocean-going vessels sailing in different areas on the sea, the change of external environment factors will cause frequent changes in load, traditional ship air-conditioning system is usually designed with a fixed cooling capacity, this design method causes serious waste of resources. A new type of sea-based air conditioning system is proposed in this paper, which uses the sea-based source heat pump system, combined with variable air volume, variable water technology. The multifunctional cabins’ dynamic loads for a ship navigating in a typical Eurasian route were calculated based on Simulink. The model can predict changes in full voyage load. Based on the simulation model, the effects of variable air volume and variable water volume on the energy consumption of the air-conditioning system are analyzed. The results show that: When the VAV is coupled with the VWV, the energy saving rate is 23.2%. Therefore, the application of variable air volume and variable water technology to marine air conditioning systems can achieve economical and energy saving advantages.

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