外文翻譯---空氣-水風(fēng)機(jī)盤管系統(tǒng)關(guān)鍵問題分析-文庫吧
2025-01-02 23:37 本頁面
【正文】 and checking calculation of two. Many reference books give is method. As shown in Figure 1, the R ε line do indoor air temperature difference can be air state point S, then can obtain the indoor Ms。 point R point isenthalpic line and 95% relative can get fresh air state point D after treatment with DS connection and extension。According to the Quantity of fresh air and supply air volume ratio of Mo Ms to the after the treatment of F. The wind wheel should bear Cold Quantity of QF is QF=MF (hRhF) =Qc=Ms (hRhS), fresh air machineCold Qo group should bear is Qo=Mo (hohD). Then according to the cold wind wheel and air units should bear, to consider appropriate found corresponding sample selection of suitable equipment. Take this way the selected units we can only guarantee the heat cooling equipment to meet the needs of Pray, does not necessarily guarantee system to meet the requirements of dehumidification. But figureAnd D points in the F point is we hope that the device can handle toState point, and D points of the actual operating conditions of F will change。At the same time, we designed the equipment of the air flow and the equipment of the wind Also differ, so the selected device is suitable or not still need to do a . The author thinks that the method of selection of equipment is timeconsuming and laborious,There are many repeated the calculation process, and the selected meet the reQuirements of the system is not very good, easy to produce the selected device.4 Calculation of equipment We first according to the cooling load of Qc indoor to determine fan Coil should bear the cold Quantity of Qt ≥ (1+ β 1+ β 2) Qc, and β 1The effect of ash deposition on heat transfer rate of wind wheel added: 10%, summer, summer and winter,20%, winter: 15%。 β 2 wind wheel intermittent use of additional rate, 20%.Then check the fan coil samples corresponding to the highgrade, fan coil all heat cooling capacity can be close to the Qt. Here we must note the cold Quantity conversion of fan coil units, namely the fan coil nominal working condition and conversion between the design conditions. We know the sample fan coil cooling capacity is under certain conditions, it is a certain the air inlet parameters, premise, entrance water temperature, water , if one of the parameters change, will lead to the wind changes in the actual processing capacity of coiler. Therefore, in the selection of a must be careful on the nominal working condition and design condition what , and check the correction coefficients corresponding to the fan coil unit in the design all hot Qt cold Quantity condition and
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