BS EN 1264-3-2009 内部水基表面加热和冷却系统.尺寸标注.pdf
《BS EN 1264-3-2009 内部水基表面加热和冷却系统.尺寸标注.pdf》由会员分享,可在线阅读,更多相关《BS EN 1264-3-2009 内部水基表面加热和冷却系统.尺寸标注.pdf(22页珍藏版)》请在三一文库上搜索。
1、 W - - - - - - - -8- - - 2- - 77- - 0,15 (m 2 K)/W shall not be used if possible. 4.1.1.4 Limit curves The limit curves in the field of characteristic curves describe in accordance with part 2 of this European Standard the relationship between the specific thermal output q and the temperature differ
2、ence H between the heating water and the room in the case where the physiologically agreed limit values of surface temperatures F,max = 29 C (occupied area) or F,max = 35 C (peripheral area) are reached1. For bathrooms ( i = 24 C) the limit curve for (F,max - i) = 9 K also applies. For design purpos
3、es, i.e. the determination of design values of the specific thermal output and the associated temperature difference between heating water and room, the limit curves are valid for the temperature drop of the heating water in a range of 0 K 0,5 the following equation has to be used: des,H 2 des,Hdes,
4、V 122 (9) The result of Equation (8) or (9) provides the design flow temperature V,des = V,des + i. For all other rooms operated at the same flow temperature V,des, for the ratio /H,j 0,5 the associated values for the temperature drop j of the heating water are taken from the field of characteristic
5、 curves (see Figure A.4) or calculated according to j ,Hdes,V j 2 (10) using the temperature differences H,j corresponding to the respective values of the specific thermal output qj (see Figure A.4). For / H,j 0,5 the temperature drop j has to be calculated as follows: 1 3 4 13 2 1 j ,H j ,Hdes,V j
6、,Hj (11) Note: Equations (8) and (10) are the result of simplifications and therefore valid only under the specified condition / H 0,5. Compared to this, equations (9) and (11) generally are applicable, i.e. for any relationship / H. If the value qdes according to equation (5) for the room used for
7、design (or for other rooms if the case arises) cannot be obtained under the aforementioned conditions by any pipe spacing, it is recommended to include a peripheral area or to provide supplementary heating surfaces. The supplementary heating surfaces shall be selected complying with the purpose and
8、the location. The additional required thermal output Qout is determined with the following equation: Qout = QN,f QF (12) In this case, the maximum specific thermal output qmax now may occur in another room. 4.1.3.3 Heating Mode - Determination of Water Flow rate The total thermal output of a floor h
9、eating system is composed of the specific thermal output q and the downward heat loss qU, see clause 8 of part 2 of this Standard. These circumstances taking into account, the design water flow rate mH of a heating circuit is calculated as follows: u ui u o W F H RqR R 1 c qA m (13) where (also see
10、Figure A.5): cW specific heat capacity of water; cW = 4190 J/(kg K)4 4) Using this value together with q in W/m2 in equation (13), mH is provided in kg/s. EN 1264-3:2009 (E) 9 Ro upwards partial heat transmission resistance of the floor structure (see equation (14) Ru downwards partial heat transmis
11、sion resistance of the floor structure (see equation (15) i standard indoor room temperature in accordance with EN1264-2 u indoor temperature of a room under the floor heated room With respect to the thermal resistances indicated in Figure A.5, the following equations are valid: u u B;o s R 1 R (14)
12、 ceiling,plaster,ceiling,ins,u RRRRR (15) where: 1/ is the heat transfer resistance on the heating floor surface; 1/ = 0,0093 (m2K)/W R;ceiling is the heat transfer resistance on the ceiling under the floor heated room; R;ceiling = 0,17 (m2K)/W NOTE The calculation procedure above described on the b
13、asis of Figure A.5 is to understand as a principle one. For other structures, an appropriate modification may be necessary. 4.1.4 Peripheral areas Peripheral areas AR, with an increased surface temperature (up to a maximum of 35 C) are generally situated along the outer walls of a room with a maximu
14、m width of 1 m. As described in clause 4.1.3, design of peripheral areas is based on the higher limit curve ( F,max - i) = 15 K (see Figure A.1). In case a series circuit is formed with a heating circuit in the occupied area, the temperature drop in the peripheral area shall be selected, so that the
15、 flow temperature, calculated from the lower limit curve, is not exceeded by entry of the heating water from the peripheral area into the occupied area. 4.2 Ceiling heating systems 4.2.1 Basic principles 4.2.1.1 Temperature difference between heating water and room For ceiling heating systems, the s
16、pecifications and equation (1) given in clause 4.1.1.1 unchanged apply. 4.2.1.2 Characteristic curve For ceiling heating systems, equation (2) and the respective specifications given in clause 4.1.1.2, apply. The gradient KH is provided as a combined result coming from part 2 and part 5 of this Stan
17、dard. Detailed information about the procedure, see part 5 of this Standard. 4.2.1.3 Field of characteristic curves In principle, the specifications given in clause 4.1.1.3 also apply. With respect to the calculation method (see part 5 of this Standard), the field of characteristic curves should con
18、tain the values of R,B specified in clause 4.1.1.3, even though not all together are needed for practical application. EN 1264-3:2009 (E) 10 4.2.1.4 Limit curve Physiological limitations concerning the surface temperatures of ceiling heating systems depend on geometrical conditions, i.e. in practice
19、 on the respective application. Therefore, in this Standard only average conditions can be taken into consideration. Consequently, it is emphasized, in practical engineering the real conditions shall be taken into account. For geometrical conditions of usual flat rooms a maximum amount for the avera
20、ge temperature of the heating ceiling surface of F,m = 29 C is applicable, i.e. a difference between the heating surface and the room of ( F,m - i ) = 9 K5. As a result, the limit curve within the field of characteristic curves is a horizontal straight line in the distance qG (see below). Using the
21、heat transfer coefficient = 6,5 W/(m2K) coming from part 5 of this Standard, the limit of the specific output results to: qG = 59 W/m2 (rounded) If higher values F,m 29 C are used, the compliance with physiological limitations shall be proved. In general, refer to EN ISO 7730. 4.2.2 Boundary conditi
22、ons 4.2.2.1 Flow pipes to adjacent rooms The same procedure described in clause 4.1.2.1 applies. 4.2.2.2 Upwards thermal insulation To limit the heat flow through the ceiling to rooms above, the required thermal resistance of the insulating layer R,ins (in principle see Figure A.5) shall be at minim
23、um in accordance with Table 1 of EN 1264-4. As for the rest, the content of clause 4.1.2.2 applies accordingly. 4.2.3 Design 4.2.3.1 Design value of specific thermal output It is recommended to apply the procedure described in clause 4.1.3.1 accordingly. 4.2.3.2 Determination of the design flow temp
24、erature It is recommended to apply the procedure described in clause 4.1.3.2 accordingly. In the case of operating with floor heating connected in parallel and using uniform flow temperature, the flow temperature of the floor heating system shall be used. 4.2.3.3 Heating mode Determination of water
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS EN 1264-3-2009 内部水基表面加热和冷却系统.尺寸标注 1264 2009 内部 表面 热和 冷却系统 尺寸 标注
链接地址:https://www.31doc.com/p-3645422.html