1. A device for holding a first and a second component together, the device comprising:
a bolt having a first end configured to secure to a first component, and a second end configured to secure to a second component, the bolt having a shank including a necked-down portion configured to concentrate axial stress;
a head near the first end;
a nut mounted about the second end, the second end extending through the nut for securing to the second component;
an actuator fitted about the shank between the head and the nut, the actuator being formed of a shape memory alloy material that is configured to elongate axially against the head and nut in response to being heated through the material’s crystalline phase change transformation temperature;
wherein the bolt is configured to convert from a compressed configuration to an elongated configuration by heating the actuator and elongating the necked-down portion to plastically deform the bolt.
2. The device of claim 1, wherein the first end comprises threading configured to secure the first component.
3. The device of claim 1, wherein the first end comprises internal threading configured to secure the first component.
4. The device of claim 1, wherein the second end comprises threading configured to secure the second component.
5. The device of claim 1, wherein the second end comprises external threading configured to secure the second component.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An air conditioning controlling system, comprising:
a sensor configured to measure a first air pressure in a cold aisle in a first space cooled by an air conditioner and a second air pressure in a hot aisle in a second space cooled by the air conditioner; and
a control apparatus configured to calculate a first prediction value of a power consumption amount of an information processing apparatus and a second prediction value of a power consumption amount of the air conditioner for each of a plurality of first temperatures at an air capacity of the air conditioner which is based on the first air pressure and the second air pressure, detect, from among the plurality of first temperatures, a temperature at which a total value of the first prediction value and the second prediction value is minimized, and set the detected temperature as a second temperature to the air conditioner.
2. The air conditioning controlling system according to claim 1, wherein the air capacity in which an air pressure difference between the first air pressure and the second air pressure falls within a given range.
3. The air conditioning controlling system according to claim 1, wherein, when the second temperature is set to the air conditioner, the control apparatus stores the total value for each of the plurality of first temperatures.
4. The air conditioning controlling system according to claim 1, wherein the air conditioner includes a temperature sensor configured to measure a temperature of air outside the first space and the second space.
5. The air conditioning controlling system according to claim 1, wherein, when the second temperature is set to the air conditioner, the air capacity is set to the air conditioner.
6. The air conditioning controlling system according to claim 1, wherein the cold aisle and the hot aisle are disposed across a rack in which the information processing apparatus is accommodated, and
the cold aisle is disposed on a cooler side.
7. The air conditioning controlling system according to claim 2, wherein the control apparatus adjusts the air capacity based on the air pressure difference.
8. The air conditioning controlling system according to claim 2, wherein the control apparatus decreases the air capacity when the air pressure difference exceeds a threshold value, and increases the air capacity when the air pressure difference is equal to or smaller than the threshold value and exhibits a negative value.
9. The air conditioning controlling system according to claim 2, wherein, within the given range, the air pressure difference is equal to or smaller than a threshold value and exhibits a positive value.
10. An air conditioning controlling method, comprising:
measuring an air pressure difference between a cold aisle and a hot aisle disposed across a rack in which an information processing apparatus is accommodated, the cold aisle corresponding to a first space cooled by an air conditioner and the hot aisle corresponding to a second space cooled by the air conditioner;
adjusting an air capacity of the air conditioner with which the air pressure difference falls within a given range; and
calculating a first prediction value of a power consumption amount of the information processing apparatus and a second prediction value of a power consumption amount of the air conditioner for each of a plurality of first temperatures to be set to the air conditioner;
selecting, from among the first temperatures, a temperature at which a total value of the first prediction value and the second prediction value is minimized; and
setting the selected temperature as a second temperature to the air conditioner.
11. The air conditioning controlling method according to claim 10, further comprising,
storing the total value for each of the plurality of first temperatures when the second temperature is set to the air conditioner.
12. The air conditioning controlling method according to claim 10, further comprising,
measuring a temperature of air outside the first space and the second space.
13. The air conditioning controlling method according to claim 10, further comprising,
setting the air capacity to the air conditioner when setting the second temperature to the air conditioner.
14. The air conditioning controlling method according to claim 10, wherein the cold aisle is disposed on a cooler side.
15. The air conditioning controlling method according to claim 10, further comprising:
decreasing the air capacity when the air pressure difference exceeds a threshold value; and
increasing the air capacity when the air pressure difference is equal to or smaller than the threshold value and exhibits a negative value.
16. The air conditioning controlling method according to claim 10, wherein, within the given range, the air pressure difference is equal to or smaller than a threshold value and exhibits a positive value.