Using a coupled heat pump desiccant wheel system to improve indoor humidity environment of NZEB in Shanghai: Analysis and optimization

2021 ◽  
pp. 108391
Author(s):  
Shaochen Tian ◽  
Xing Su ◽  
He Li ◽  
Yixiang Huang
Keyword(s):  
Heat Pump ◽  
Desiccant Wheel ◽  
Humidity Environment ◽  
Indoor Humidity

PERFORMANCE ASSESSMENT OF A SOLID DESICCANT AIR DEHUMIDIFIER

2016 ◽  
Vol 78 (8-4) ◽  
Author(s):  
Nazri Kamsah ◽  
Haslinda Mohamed Kamar ◽  
Muhammad Imran Wan Khairuzzaman ◽  
M. Idrus Alhamid ◽  
Fazila Mohd Zawawi
Keyword(s):  
Removal Rate ◽  
Operating Parameters ◽  
Inlet Temperature ◽  
Moisture Removal ◽  
Desiccant Wheel ◽  
Air Inlet ◽  
Low Humidity ◽  
Experimental Rig ◽  
Humidity Environment

The presence of moisture in the air along with temperature has a long term and devastating effect on man and material. One way to create a low humidity environment is by using a solid desiccant wheel system. In the present work, an experimental analysis has been carried out under steady-state conditions to investigate the effects of different operating parameters on a solid desiccant wheel system performances. An experimental rig consists of an FFB300 air dehumidifier system was constructed. A parametric investigation was carried out to examine the effects of the reactivation air inlet temperature and process air outlet velocity on the thermal effectiveness, dehumidification efficiency, and moisture removal rate of the desiccant wheel system. The analysis shows that both thermal effectiveness and dehumidification efficiency decrease with the increase of the reactivation air inlet temperature, by 2.5 % and 43 %, respectively. Likewise, when the process air outlet velocity increases both performances criteria reduce by 10 % and 28 %, respectively. The moisture removal rate increases significantly by 30 % as the reactivation air inlet temperature increases. However, the process air outlet velocity has no significant effect on the moisture removal rate. 

scholarly journals Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5918
Author(s):  
Shuo Liu ◽  
Chang-Ho Jeong ◽  
Myoung-Souk Yeo
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
System Performance ◽  
Indoor Environment ◽  
High Humidity ◽  
Comfort Zone ◽  
Upward Trend ◽  
Cooling Systems ◽  
Desiccant Wheel ◽  
Extra Energy

The packaged terminal air conditioning with reheat (PTACR) system, as a commonly used dehumidification system, faces the problem of extra energy consumption in the deep-cooling and reheating processes. Therefore, different heat pump assisted hybrid solid desiccant cooling (HPDC) systems were proposed and their characteristics were investigated via EnergyPlus simulations. The system energy efficiency presents an upward trend with the increase in outdoor temperature and humidity. A high-humidity climate leads to the improvement of system performance. The dehumidification performance of the desiccant wheel in the HPDC system declines when outdoor humidity increases. Compared with the PTACR system, the energy consumption of the HPDC system in which the evaporator was placed upstream of the desiccant wheel is reduced by 36%, 66%, and 64%, respectively, under different high-humidity climates. The system maintained the indoor environment within the comfort zone, and eliminated the need for a heat source for desiccant regeneration. In conclusion, the HPDC system is an available alternative that considers both energy consumption and system performance. Placing the evaporator upstream of the desiccant wheel is more advantageous in high-temperature and high-humidity climates.

scholarly journals Application of heat pump combined two-stage desiccant wheel fresh air system of residential buildings in mixed climate zone

2019 ◽  
Vol 111 ◽  
pp. 01009
Author(s):  
Shaochen Tian ◽  
Xing Su ◽  
Xu Zhang
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Residential Buildings ◽  
Dew Point ◽  
Air Conditioner ◽  
Operation Performance ◽  
Two Stage ◽  
Climate Zone ◽  
Desiccant Wheel ◽  
Air System

The building requires dehumidification for a long period of time in mixed climate zone of China. As a conventional method for dehumidification, vapor compression systems remove the water vapor by cooling the process air below dew point. This system consumes a lot of energy for reheating the air to meet the requirement of supply air temperature. A heat pump combined with two-stage desiccant wheel (TSDW&HP) is proposed as an air conditioning and dehumidification system in this study. The operation performance of proposed system applied in a hypothetical residence with 3 residents was investigated and simulated by using TRNSYS software. The operation modes of the system are discussed for different scenarios of season and outdoor air humidity ratio. In dehumidification season, fresh air deals with all of the latent load. In air conditioning season, fresh air deals with all of the moisture load with part of the cooling load. When evaporation temperature of HP is reduced and more moisture load is processed by evaporator in air conditioning season, there is a balance point between the performance of DWs and heat pump. The energy consumption of TSDW&HP fresh air system was compared with a conventional fresh air conditioner during dehumidification season and air conditioning season. It was found that the energy-saving potential of this system is 27.3% compared with conventional air conditioner.

scholarly journals ANALYSES OF INDOOR HUMIDITY ENVIRONMENT IN NATIONALLY RESIDENTIAL HOUSES OF JAPAN

2009 ◽  
Vol 15 (30) ◽  
pp. 453-457 ◽  
Author(s):  
Huibo ZHANG ◽  
Hiroshi YOSHINO ◽  
Shuzo MURAKAMI ◽  
Kazuaki BOGAKI ◽  
Toshihiko TANAKA ◽  
...  
Keyword(s):  
Humidity Environment ◽  
Indoor Humidity
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