Research on cooling performance of phase change material-filled earth-air heat exchanger
| Autor: | Jianquan Lin, Yimin Xiao, Haotian Huang, Tiecheng Zhou, Yanan Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Renewable Energy
Sustainability and the Environment business.industry 020209 energy Nuclear engineering Energy Engineering and Power Technology 02 engineering and technology Cooling capacity Thermal energy storage Phase-change material Energy storage Energy conservation Fuel Technology 020401 chemical engineering Nuclear Energy and Engineering Air conditioning HVAC Heat exchanger 0202 electrical engineering electronic engineering information engineering Environmental science 0204 chemical engineering business |
| Zdroj: | Energy Conversion and Management. 177:210-223 |
| ISSN: | 0196-8904 |
| Popis: | As a passive energy technology, the earth-air heat exchanger (EAHE) can greatly contribute to reducing the energy consumption of heating, ventilating, and air-conditioning (HVAC) systems. In a traditional EAHE, the cooling/heating effect is achieved through the charging/discharging process of soil sensible heat. However, this process is detrimental to fully develop its potential. Considering that the phase change-based thermal energy storage technology has outstanding advantages in this regard, a new system named phase change material (PCM)-filled EAHE is proposed to overcome this deficiency. To study the cooling performance of this new system, a three-dimensional numerical model based on the effective heat capacity method has been built in ANSYS FLUENT and validated using an indoor test rig, which was filled with some laboratory-prepared shape-stabilized PCM. Then comparative studies between the PCM-filled EAHEs and the traditional one are conducted under Chongqing (China) summer condition. The results indicate that, at the daily maximum outdoor temperature, the outlet temperature of the PCM-filled EAHE, which employs the laboratory-prepared shape-stabilized PCM, is approximately 0.83 °C lower than that of the traditional EAHE. Therefore, this PCM-filled EAHE can achieve an improvement of 20.24% in cooling capacity compared to the traditional one. |
| Databáze: | OpenAIRE |
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