| US 7,565,926 B2 | ||
| Heat exchange method and heat exchange apparatus | ||
| Yoshiyuki Okada, Shioya-gun (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jul. 11, 2005, as Appl. No. 11/177,323. | ||
| Claims priority of application No. 2004-205061 (JP), filed on Jul. 12, 2004. | ||
| Prior Publication US 2006/0005554 A1, Jan. 12, 2006 | ||
| Int. Cl. F25B 29/00 (2006.01); F24F 11/06 (2006.01) | ||
| U.S. Cl. 165—201 | 8 Claims |
| 1. A heat exchange method which uses a heat exchange unit for exchanging heat between first and second media to adjust a temperature
of the first medium, said method comprising:
(a) a detection step of detecting temperatures of the first and second media to enter the heat exchange unit; and
(b) an adjustment step of adjusting a flow rate of the second medium based on the temperatures of the first and second media
detected in said detection step,
wherein said adjustment step comprises:
(i) a target heat quantity calculation step of calculating a target heat quantity based on a target temperature of the first
medium and the temperature of the first medium detected in said detection step;
(ii) a first temperature difference calculation step of calculating a first temperature difference based on the target temperature
and the temperature of the second medium detected in said detection step;
(iii) a setting step of setting a provisional target flow rate of the second medium;
(iv) a second temperature difference calculation step of calculating a second temperature difference based on the target heat
quantity, the provisional target flow rate, and the temperatures of the first and second media detected in said detection
step;
(v) an average temperature difference calculation step of calculating one of a logarithmic average temperature difference
and an average temperature difference at the heat exchange unit based on the first and second temperature differences;
(vi) a heat exchange quantity calculation step of calculating a heat exchange quantity at the heat exchange unit based on
one of the logarithmic average temperature difference and the average temperature difference and a heat exchange gain of the
heat exchange unit; and
(vii) a determination step of determining a target flow rate of the second medium based on a result of a comparison between
the heat exchange quantity and the target heat quantity.
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