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GB 28381-2012 English PDF (GB28381-2012)

GB 28381-2012 English PDF (GB28381-2012)

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GB 28381-2012: Minimum allowable values of energy efficiency and evaluating values of energy conservation for centrifugal blower

This Standard specifies the minimum allowable values of energy efficiency, evaluating values of energy conservation, and test methods for centrifugal blowers. This Standard applies to single-stage dual-support low-speed centrifugal blowers; multi-stage low-speed centrifugal blowers; single-stage dual-support high-speed centrifugal blowers (including single-side impeller of dual-inlet blower); and multi-stage high-speed centrifugal blowers.
GB 28381-2012
ICS 27.010
F 01
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
GB 28381?€?2012
Minimum allowable values of energy efficiency and
evaluating values of energy conservation for
centrifugal blower
ISSUED ON. MAY 11, 2012
IMPLEMENTED ON. SEPTEMBER 01, 2012
Issued by.
General Administration of Quality Supervision, Inspection and
Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Classification of products ... 5
5 Technical requirements ... 5
6 Test method ... 13
References and Original Chinese Documents ... 14
Foreword
For the purpose of this standard, subclause 5.3 is normative and the other clauses/subclauses are informative.
This standard is drafted in accordance with the rules of GB/T 1.1 ?€? 2009. This standard was proposed by the Department of Resource Conservation and Environment Protection of the National Development and Reform Commission. This standard is under the jurisdiction of National Technical Committee of Energy Fundamentals and Management of Standardization Administration of China (SAC/TC 20).
Drafting organizations of this standard include Shenyang Blowers (Group) Co., Ltd, China National Institute of Standardization, Shaanxi Blowers (Group) Co., Ltd, Chongqing General Industry (Group) Co., Ltd, Nantong Dart-Pollrich Fan Co., Ltd, Shandong Zhangqiu Blower Co., Ltd, Zhejiang Shangfeng Industrial Holding Ltd, and Jiangsu Jintongling Fan Co., Ltd.
The chief drafting staffs of this standard include Chen Fengyi, Mei Yuanping, Zhao Yuejin, Zheng Hua, Li Baohou, Liao Yulong, Li Junhua, Xu Baohua, Zhu Mengbo and Cao Ping.
Minimum allowable values of energy efficiency and evaluating
values of energy conservation for centrifugal blower
1 Scope
This standard specifies the minimum allowable values of energy efficiency, evaluating values of energy conservation, and test methods for centrifugal blowers. This standard applies to single-stage dual-support low-speed centrifugal blowers; multi-stage low-speed centrifugal blowers; single-stage dual-support high-speed centrifugal blowers (including single-side impeller of dual-inlet blower); and multi-stage high-speed centrifugal blowers.
2 Normative references
The following normative documents are indispensable for application of this standard. For dated normative documents, only the edition dated with the day applies to this standard. For undated normative documents, the latest edition (including all amendments) applies to this standard.
JB/T 2977 Technical terms for industry fans, turbo-blowers and compressors JB/T 3165 Thermodynamic performance test for centrifugal & axial blower and compressor
JB/T 7258 Centrifugal blower for general purpose
3 Terms and definitions
The following definitions apply to this standard, in addition to those defined in JB/T 3165 and in JB/T 2977.
3.1
Minimum allowable values of energy efficiency for centrifugal blower
The minimum guaranteed allowable values of variable efficiency for centrifugal blower, under the specified standard conditions of testing.
3.2
Evaluating values of energy conservation for centrifugal blower
the minimum guaranteed allowable values of variable efficiency which shall be achieved with respect to energy conservation for centrifugal blower, under the specified standard conditions of testing.
4 Classification of products
By the number of stages, structure and number of revolutions, a centrifugal blower may be classifed as single-stage cantilever-fitted low-speed centrifugal blower; single-stage dual-support low-speed centrifugal blower; multi-stage low-speed centrifugal blower; single-stage cantilever-fitted high-speed centrifugal blower; single-stage dual-support high-speed centrifugal blower; and multi-stage high-speed centrifugal blower etc.
5 Technical requirements
5.1 Basic requirements
Product design, manufacturing and quality of centrifugal blower shall comply with provisions of JB/T 7258.
5.2 The variable efficiency of centrifugal blower shall be calculated according to the following equation.
%100
)/lg(
)/lg(
)1/(
1%100
)1/(
)1/(%100
pol ????=
=??
=??=
TT
PP
kkkk
mm
tot
pol?? ... (1)
Where.
??pol is the polytropic efficiency of the centrifugal blower;
Table 6 Evaluating values of energy conservation for multi ?€? stage low ?€? speed centrifugal blowers
b 2 /D 2
Number
of stages
The highest polytropic efficiency of the centrifugal blower within the
operating range, ??pol, %
Impeller diameter, D 2 , in mm
Less than
301 to 400 401 to 600 601 to 800
More than
Less than 0.020
2 to 3 54.5 56.0 57.0 58.5 57.5
4 to 6 54.0 55.5 56.5 58.0 57.0
0.021 to 0.030
2-3 68.5 71.5 72.0 73.5 74.0
4 to 6 68.0 71.0 71.5 73.0 73.5
0.031 to 0.040
2 to 3 70.5 73.0 73.5 74.5 75.5
4 to 6 70.0 72.5 73.0 74.0 75.0
0.041 to 0.050
2 to 3 73.0 74.0 74.5 75.5 76.5
4 to 6 72.5 73.5 74.0 75.0 76.0
References and Original Chinese Documents
[1] GB 28381-2012 The centrifugal blower energy efficiency limited value and evaluating values of energy.

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