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Experiment Study on a Novel Silica Gel-Water Adsorption Chiller

Author: ZhangWenJie
Tutor: WeiXinLi；FanZhongLei
School: Zhengzhou University
Course: Chemical Process Equipment
Keywords: silica gel-water adsorption refrigeration COP SCP
CLC: TB651
Type: Master's thesis
Year: 2008
Downloads: 49
Quote: 1
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Abstract


Adsorption refrigeration technology has been attracting more and more attention as its energy conservation and environmentally friendly properties. The adsorption chiller can be driven by low-grade waste heat or solar energy instead of electric or fossil fuels as driving source, and do not have to use CFCs as refrigerant which has high ODP、GWP coefficient. As one of these chillers, Silica gel-water adsorption chiller has been taken more attention by researchers and There’re many novel absorption refrigeration chillers has been investigated in the recent years. Although the performance of novel silica gel-water absorption chillers has been greatly improved in contrast to the previous absorption chillers, There’re many disadvantageous problems need to be studied and solved such as low COP、SCP、low efficiency of energy-using compared with the traditional compression chillers.In this study, The transient performance, operating characteristics, thermal characteristics, the various media and the water temperature impact on the performance of silica gel - water absorption chiller has been taken an experimental research, The result can be used as a reference to the design and operation of new chillers. The key conclusions as follows:1. The novel silica gel-water adsorption chiller which this experiment studied demonstrated the unique operational characteristics: Although Mass recovery process do not product cooling capacity; It plays an important roles as the increase of the system’s cycle adsorption capacity and improvement of the system’s cooling capacity.2. Heat source as a driving force impacts the performance of this system obviously. The system demonstrated good performance when the heat source temperature varies from 55℃to 90℃. The cooling capacity can reach 5.6KW at hot water inlet temperature T_h=90℃, and 2.15KW at the hot water inlet T_h=55℃. The COP of the system appears two peaks with the scope of the heat source changed from 55℃to 90℃in the experiment, the highest experimental COP values was 0.42. The novel silica gel-water adsorption chiller in this paper have the best performance when the heat temperature changed in the scope between 60℃～85℃.3. The cooling capacity Qr of the system increase with the increased of hot water flow, the cooling capacity increased by 3%～7% when the hot water flux ever increase 0.4m~3/h. the maximum COP achieved when the hot water flux was 2.9 m~3/h. The performance of the system achieved 80% of the maximum values when hot water flux was 1.7m~3/h. The system has good heat flow various adaptation.4. In this experiment, The cooling water inlet temperature impact smallest on the performance when cooling water inlet temperature below 35℃, The COP decreased 5%～8% and the SCP decreased 5%～11% when the cooling water increased every 5℃. And when the cooling water inlet temperature exceed 35℃, it impact obviously on the performance as The COP decreased 18%～25%, the SCP decreased 21%～40% when the cooling water increase every 5℃.5. Under the same working conditions, The COP and the cooling capacity Qr respectively increased 7%～17% and 5%～13% when the chilled water inlet temperature increased every 5℃. Therefore, the better choose is increasing the import temperature of the chilled water as possible in order to improve the performance of this system to6. The COP and Qr of this system is not notability changed with the change of the chilled water flow rate, So it’s the not perfect choose to increase the chilled water flow in order to improve the system performance.

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment > Refrigerator
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