TY - JOUR
T1 - An experimental and analytical study on the feasibility of SMA spring driven actuation of an iris mechanism
AU - Rajan, Aravindh
AU - Abouseada, Mostafa
AU - Manghaipathy, Pavithra
AU - Ozalp, Nesrin
AU - Majid, Feras Abdul
AU - Salem, Ayman
AU - Srinivasa, Arun
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2016/7/25
Y1 - 2016/7/25
N2 - Variation in incoming solar energy adversely affects the temperature inside a solar reactor and lowers its efficiency. Therefore, it is important to develop a mechanism that can maintain semi-constant temperatures inside the reactor from sunrise to sunset. In this paper, we present an iris mechanism that reduces or enlarges its circular opening with the use of Nickel–Titanium Shape Memory Alloy (SMA) springs. SMA springs possess memory of their shapes at certain temperatures. Hence, by controlling the temperature of the spring, it is possible to exert different forces that may then be transferred to the variable aperture mechanism. In this study, variation of the force exerted by an SMA spring with respect to temperature was experimentally tested and the viability of an SMA spring's use in actuating an iris mechanism aperture was examined. In order to simulate conditions under fluctuating solar radiation, a 7 kW solar simulator was used in experiments at varying power levels. It was observed that SMA springs are promising as a replacement of the actuation mechanism driven by a motor.
AB - Variation in incoming solar energy adversely affects the temperature inside a solar reactor and lowers its efficiency. Therefore, it is important to develop a mechanism that can maintain semi-constant temperatures inside the reactor from sunrise to sunset. In this paper, we present an iris mechanism that reduces or enlarges its circular opening with the use of Nickel–Titanium Shape Memory Alloy (SMA) springs. SMA springs possess memory of their shapes at certain temperatures. Hence, by controlling the temperature of the spring, it is possible to exert different forces that may then be transferred to the variable aperture mechanism. In this study, variation of the force exerted by an SMA spring with respect to temperature was experimentally tested and the viability of an SMA spring's use in actuating an iris mechanism aperture was examined. In order to simulate conditions under fluctuating solar radiation, a 7 kW solar simulator was used in experiments at varying power levels. It was observed that SMA springs are promising as a replacement of the actuation mechanism driven by a motor.
KW - Analytical calculations
KW - Aperture
KW - Iris mechanism
KW - Shape Memory Alloys (SMA) spring
KW - Solar energy
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U2 - 10.1016/j.applthermaleng.2016.04.033
DO - 10.1016/j.applthermaleng.2016.04.033
M3 - Article
AN - SCOPUS:84963944013
SN - 1359-4311
VL - 105
SP - 849
EP - 861
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -