外文翻译---空气-水风机盘管系统关键问题分析

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1、 中文 2700 字 附录 附录 A 外文翻译 Analysis on typical problems in air-water fan-coil unit system AbstractThis paper has made the simple introduction about the essential feature and suitable situation of air-water fan-coilunit system. It also has made the key elaboration to equipment choice and examination abo

2、ut this system. Simultaneously hasanalysised on typical problems of this system in details not only theoretically but also practically, and also presents recommendedproposals. Keywordsfan-coil unit fresh air handling unit water system examinationsystem features and Applications 0 Introduction With t

3、he improvement of peoples living standards, social developmenExhibition, central air conditioning construction also more and more. Air - water fanCoil system because of its uniQue advantage in the air conditioning system in civil buildinShare is growing. How to regulate the air - water fanDesign of

4、fan coil system, the air conditioning reQuirements at the same time theJi, also becomes more and more important. 1System Features and application of occasions The advantage of this system is to be independent of each air-conditioned room Regulation, without disturbing each other； and the introductio

5、n of fresh air but also good Guaranteed room hygiene reQuirements； space occupied by the pipeline system is also small. Air - the biggest flaw water fan coil system is Summer Operation Dehumidification capacity state system is small； winter humidity conditions can not enter Line control. So it is ve

6、ry suitable for office, hotel and other needs of the independent Regulation, and the humidity is not strictly reQuired for the place. 2fresh air state point determination Air-water fan coil unit system, with fresh air state point .Different will directly decide the fresh air handling units and fan c

7、oil capacity.Small. Generally speaking, after treatment of fresh air state point in four cases.One is the fresh air to the indoor temperature； the second is the fresh air handlingThe indoor enthalpy； third is the fresh air into the wet containing chambe.Amount； fourth is the fresh air to moisture co

8、ntent below room. In industry.Process practice, we hope to bring fresh air to the indoor enthalpyValue, this fresh air unit bear completely fresh air cooling load and part of new.Wet load wind, fan coil units as long as undertake indoor cold negative.The Netherlands, wet load can load and some fresh

9、 air. This combination.Can share the water system and the fan coil unit type air units, but also.Give full play to the role of processing capacity of fresh air unit and fan coil unit 3Design and calculation of equipment equipment selection calculation generally can be divided into design and checkin

10、g calculation of two. Many reference books give is designed.Calculation method. As shown in Figure 1, the R line do indoor proper.Supply air temperature difference can be air state point S, then can obtain the indoor air.Volume Ms； point R point isenthalpic line and 95% relative humidity.You can get

11、 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 fan.State after the treatment of F. The wind wheel should bearCold Quantity of QF is QF=MF (hR-hF) =Qc=Ms (hR-hS), fresh air machineCold Qo gro

12、up should bear is Qo=Mo (ho-hD). Then according to the cold wind wheel and air units should bear, to consider appropriate amplification.Factors found corresponding sample selection of suitable equipment. Take this way the selected units we can only guarantee the heat cooling equipment to meet the ne

13、eds ofPray, 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 t

14、he air flow and the equipment of the windAlso differ, so the selected device is suitable or not still need to do a check.Calculation. The author thinks that the method of selection of equipment is time-consuming and laborious,There are many repeated the calculation process, and the selected device.T

15、o meet the reQuirements of the system is not very good, easy to produce the selected device. 4Calculation of equipment We first according to the cooling load of Qc indoor to determine fanCoil should bear the cold Quantity of Qt (1+ 1+ 2) Qc, and 1The effect of ash deposition on heat transfer rate of

16、 wind wheel added: 10%, summer, summer and winter,20%, winter: 15%； 2 wind wheel intermittent use of additional rate, 20%.Then check the fan coil samples corresponding to the high-grade, fan coil all heat cooling capacity can be close to the Qt. Here we must note the cold Quantity conversion of fan

17、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 flow.Cold, if one of theparameters ch

18、ange, 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 parameters.Different, and check the correction coefficients corresponding to the fan coil unit in the design al

19、l hot Qt cold Quantity condition and sensible heat cooling capacity of Qs.Select the fan coil units, according to 0.9Qt = MF (hR-hF)；0.9Qs = MF (tR-tF) to determine the actual running conditions of wind wheelThe exports of the state of F, where Qt, Qs are respectively the fan disc.Tube mid-range air

20、 runtime all hot and cold Quantity and heat Quantity of cold, the reason.The cold front is multiplied by 0.9 is to consider the wind wheel running after a period of time.Will decline.Selection of fresh air unit must be based on the Quantity of fresh air is designed to the primary unit model, and the

21、n determined according to the cooling unit must bear surface units of the rows of heat exchanger. Similarly in the selection we must carefully than nominal working condition and design condition which.The number of different, and check the correction coefficients corresponding to calculate unit in t

22、he design condition .All heat cooling capacity under Qt, and then according to 0.9Qt = MF(h0-hd) and d=90-95% determine the state point of D after treatment of fresh air.D point and F point is determined to determine the air state point S,According to the moisture load heat, we can determine the int

23、erior.State point is in the allowable range. In order to complete the entire system equipment selection process.To determine the 5 fan coil water system forms.Fan coil watersystem from the angle of the form classification of different points,There are many kinds of forms. Here I will focus on the same and different process system selection. We have always believed that when the water system the ratio is small, the pipeline resistance and resistance of the device is less than 1/3 when the applicable ISO the scheduling system, or is used with the process