| Title |
Estimation of Relative Resource Circulation for Heat Exchangers Using Material Flow Analysis for Air Conditioners |
| ID_Doc |
22728 |
| Authors |
Fujii, S; Oshita, Y; Kikuchi, Y; Ohara, S |
| Title |
Estimation of Relative Resource Circulation for Heat Exchangers Using Material Flow Analysis for Air Conditioners |
| Year |
2022 |
| Published |
International Journal Of Automation Technology, 16.0, 6 |
| DOI |
10.20965/ijat.2022.p0737 |
| Abstract |
The demand for resource circulation of heat exchang-ers in air conditioners is expected to grow rapidly; however, the market stocking time is relatively long. Therefore, this scenario was used as a case study for sustainable products design. A material flow anal-ysis was conducted to estimate the balance between global relative resource consumption for shipment, waste, and installed stock from publicly available in-formation up to 2050. Based on the projected demand through 2050, the shipment volume for each year was calculated on a cooling capacity basis. From this anal-ysis, the waste volume was calculated. Using the ship-ment volume on the basis of yearly cooling capacity, the shipment volume on a resource basis was calcu-lated considering the heat transfer coefficient. The balance between the waste volume and the installed stock was estimated. The resource circulation was simulated by defining variables such as the ratio of units that can be converted from waste to shipment and the ratio of heat exchangers using circulated re-sources in the total number of shipments. The re-sults indicate that the shipment, waste, and installed stock of resources projected for 2050 were greater than those at the 2021 levels by factors of 2.2, 2.8, and 2.9, respectively. In addition, they were greater than those of the 2021 levels in the scenarios by factors of 1.8, 2.2, and 2.8 accounting for the increase of heat transfer coefficient into account, indicating the impor-tance of improvement of heat transfer. The simula-tion of circulation showed that a fully closed loop in 2050 would be difficult to achieve owing to the short-age of heat exchangers for waste-to-shipment. Sensi-tivity analysis also indicated that even under condi-tions where there is no predicted shortage of circulated resources for 2050, achieving the target in a short pe-riod of time may cause a rapid increase in demand for circulating resources. This would subsequently, lead to a shortage of supply compared to demand. Thus, it is important to account for these dynamics relating re-source circulation and strategy planning during anal-ysis. |
| Author Keywords |
circular economy; heat transfer; closed loop; cooling |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Emerging Sources Citation Index (ESCI) |
| EID |
WOS:000917123000007 |
| WoS Category |
Automation & Control Systems |
| Research Area |
Automation & Control Systems |
| PDF |
https://doi.org/10.20965/ijat.2022.p0737
|