heat exchanger design handbook (1st issue), by e u schlunder

... difference of pressure that may prevail; thereafter, before leaving the heat exchanger, the fluid may become superheated. Temperature changes there- fore do occur in the phase-changing fluid ... representation of a regenerative heat exchanger 0 1983 Hemisphere Publishing Corporation HEAT EXCHANGER DESIGN HANDBOOK 1 Heat exchanger theory VDI-Verlag GmbH Verlag des Vereins...

Ngày tải lên: 02/04/2014, 15:25

... dimen- sionless " c temperature e ectiveness of the cold fluid [defined by Eq. (3.52)], also as the exchanger e ectiveness of the cold fluid in Appendix B, dimensionless " cf counterflow heat exchanger e ectiveness ... published on heat exchangers. These are summarized in the General References at the end of the book. This text is an outgrowth of lecture notes prepared by...

Ngày tải lên: 02/04/2014, 15:24

... citation-sequence style, you would use a number in superscript format to cite the source, and then give the full citation in the reference page. Here’s how the previous passage would look in the citation-sequence ... don’t need to include the author’s last name in the parentheses at the end of the sentence. If you include the year and the name of the author in the sentence (“McGuire (200...

Ngày tải lên: 31/08/2013, 19:14

... constant heat flux at the pipe wall (cq" pw ). The heat transport through the stagnant water is less effective, whereby the temperature difference between pipe wall and borehole wall must be ... borehole is the same. This is because a constant heat flux at the pipe wall results in higher temperatures in the middle of the borehole, while constant temperature results in a more eve...

Ngày tải lên: 05/09/2013, 14:58

... is also employed. When used directly, steam pressures are usually 15 lb/in 2 gauge or less. When used with a heat exchanger, steam pres- sures up to 100 lb/in 2 gauge are common. Higher pressures ... are open and need makeup water to replace the water evaporated in the tower. Closed systems require some means of compensating for the changes in volume of the fluid due to temperature changes....

Ngày tải lên: 17/10/2013, 22:15

... signal is the use of the outside air temperature as a reference to reset the building heating water supply temperature. Many control systems include other elements, such as switches, re- lays, and ... in heat- ing capacity per pound. Thus, a flow rate decrease of 80 percent may result in an output decrease of only 20 to 30 percent. The shape of the curve is determined by the temperature di...

Ngày tải lên: 20/10/2013, 16:15

... reserved. Any use is subject to the Terms of Use as given at the website. 214 Chapter Seven Figure 7.13a Well water based chiller heat recovery system, heating mode. although these valves are ... to 20-ft) pressure drop, the first pressure-drop device in the system. This reduces the remaining pressure throughout the system. Chiller heat exchangers (tube bundles) are usually rated for 150 ....

Ngày tải lên: 20/10/2013, 16:15

... surface area, the heat transfer factor k, and the temperature difference. Because the temperature difference varies throughout the coil, it is described, for calculation purposes, by a single ... temperature and pressure in the condenser. The high- pressure liquid is passed through a pressure-reducing device to the evaporator. At the lower pressure, the liquid tends to evaporate, re- movi...

Ngày tải lên: 24/10/2013, 15:15

... continue to completion. The turbulence must be vio- lent enough to ensure good contact between the fuel and the oxygen. Assuming there is enough combustion air to work with, inadequate turbulence ... contiguous with the area served. In general, the heating source is remote—water or steam is used—but electric resistance heating is common. Duct heaters and some heat pumps can also be included...

Ngày tải lên: 24/10/2013, 15:15