abercrombie milano Vacuum cooling the gas temperat

Vacuum cooling characteristics of the gas temperature

Re-opening the pressure valve on the pressure when the vacuum chamber to re-enter the indoor air temperature is high,[link widoczny dla zalogowanych], causing the air heating chamber; the other hand, temperature difference between water and air, by radiation and convection heat transfer, the air near water layer temperature is lower. 12O1OO80ca60 were 40 deaf 2O0O10O200300400500600 time / s Figure 5, the gas pressure inside the container of water and a temperature curve (including re-compression) 3025201510500100200300400 time / s Figure 6, the gas pressure inside the container of water and a temperature curve (including re-compression) 3.2 containers that hold water 3.2.1 Experimental methods outside the gas experiments on groups with the same water container; measuring points: at the surface of the water, water containers spatial vacuum chamber outside the container bottom, top and middle are arranged thermocouple T4, T5, rI ' 6,[link widoczny dla zalogowanych],, I7. 3.2.2 Experimental results and analysis of Figure 7 re-open the pressure valve for the entire complex when the pressure of the experimental curve, compared with Figure 6, the vacuum chamber containers that hold water and outdoor air by the impact of small temperature rise Obviously, even more than the ambient temperature; With the pressure to atmospheric pressure after the air temperature by condensing water heater coil and other factors slow down, the overall trend is: the upper part of the vacuum chamber at high temperature, central second, bottom minimum. Due to the combined pressure valve open, vacuum chamber pressure response rate was so rapid, a large number of high-temperature gas (ambient temperature) into the indoor air temperature rise significantly. The bottom of the air from the vacuum chamber together with its diffusion rate into the limited air temperature rise of the middle and upper start time slightly delayed. When re-opening the vacuum valve inside and outside a certain pressure difference, air enters the site from time to time some clever ∞ ∞ OBd Mount ROO tuo ∞ ∞ ∞ ∞ O ∞} to find the weak Canadian O at Mount R00 ∞ ∞ ∞ ∞ {find 00b, the first 27, No. 6 in December 20O6 vacuum cooling of the gas temperature changes in the characteristics of f. 27No. 6December. 20o6 energy,[link widoczny dla zalogowanych], when the air after the full access to this part of the vacuum energy into heat can make the indoor air temperature exceeds the ambient temperature.5O4O302010. 1201008060,-hE4020OO15O300450600750 time / s Figure 7, the gas pressure outside the container of water and a temperature curve (full re-compression) 3.2.3 Theoretical Analysis of the process of re-pressing a lot of pressure differential on the outside because of the influx of gas, which can be as inflatable vacuum chamber for the process. Taken as the heat of indoor air system, its volume unchanged. Established after the end of the vacuum chamber vacuum cooling gas temperature. , Pressure P, mass m; complex pressure after the pressure rises to P, temperature, mass m. Because the parameters of a stable atmosphere (PTo, h. Does not change with time) equation (3) becomes: m2 , then (5) can be written as m2cm = m1cH) T1 + (m2 a m1) c = dim c plus the kicking of a complete lack of pressure when the temperature of re = PPTP7To (6) a (2-1) 1 + lou consider to gas expansion, the sample gasification condensate water heater coil and other factors, need to amend its introduction Lu correction factor, there are: P s PTP7To (7) a (2-1) 1 +104 Conclusion and outlook Through experiments and analysis the following conclusions: 1) vacuum cooling process, the vacuum chamber gas temperature occur repeatedly; 2) after vacuum cooling the complex pressure on the vacuum chamber, the gas temperature rise, the vacuum chamber air temperature increase in some regions larger, more than the ambient temperature; Outlook as follows: I) vacuum cooling process of the sample stage temperature drop significantly very short duration, the maximum temperature drop rate of very large, so be instantaneous temperature drop rate further, the analysis of evaporation rate, etc.; 2) re-pressure process gas temperature of the sample need to go into details about the quality of the impact; 3) exploring a vacuum (reduced pressure) boiling theory as to the mechanism of the system from the ground to study the vacuum cooling technology. References l1jKarlMeDonald, Da-WenSun. Vacuumcoolingtechnologyforthefoodprocessingindustry: al ~ viewlJJ. Journaloffoodengineering ,2000,45:55-65 [2] DU Jian Tong, Zhang Rongling. Fruit and Vegetable Vacuum cooling device technology development prospects [J]. Vacuum and Cryogenics, 1999,[link widoczny dla zalogowanych], (3) :175-179 [3] Yan family,[link widoczny dla zalogowanych], Wang Yongqing. Engineering Thermodynamics [M]. Beijing: China Electric Power Press ,2004,69 -73-21-

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