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GB/T 40150-2021: Grain and oil storage - Evaluation of uniformity of grain mechanical ventilation
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Grain and oil storage - Evaluation of uniformity of grain mechanical ventilation
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GB/T 40150-2021
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Basic data | Standard ID | GB/T 40150-2021 (GB/T40150-2021) | | Description (Translated English) | Grain and oil storage - Evaluation of uniformity of grain mechanical ventilation | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B20 | | Word Count Estimation | 6,674 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 40150-2021: Grain and oil storage - Evaluation of uniformity of grain mechanical ventilation---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Grain and oil storage-Evaluation of uniformity of grain mechanical ventilation
ICS 67.060
CCSB20
National Standards of People's Republic of China
Evaluation Method of Ventilation Uniformity of Grain and Oil Storage Machinery
Released on 2021-05-21
2021-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document was proposed by the State Bureau of Grain and Material Reserves.
This document is under the jurisdiction of the National Cereals and Oils Standardization Technical Committee (SAC/TC270).
Drafting organizations of this document. Henan University of Technology, Beijing Southwest Suburb Grain Collection and Storage Co., Ltd.
The main drafters of this document. Wang Ruolan, Huang Yawei, Chen Chuanbo, Tian Shupu, Gao Yushu.
Evaluation Method of Ventilation Uniformity of Grain and Oil Storage Machinery
1 Scope
This document specifies the factors influencing the uniformity of vertical mechanical ventilation during grain storage, the determination of evaluation parameters, and the expression methods and calculations for evaluation.
Calculation, result presentation and judgment, etc.
This document is applicable to the evaluation of the mechanical ventilation uniformity of bulk grain piles during the grain storage period of the single-storey warehouse.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 5491 Grain and oilseed inspection samples and sampling method
GB/T 26882.1 Grain Condition Monitoring and Control System for Grain and Oil Storage Part 1.General Rules
GB/T 29890 Technical Specifications for Grain and Oil Storage
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Uniform ventilation
During the ventilation process of the granary, the difference of the ventilation volume of different grain layers and different positions is small, and the ventilation effect is consistent.
3.2
Ventilated dead corner anarea beyond the reachofairflow
During ventilation, the air volume that is difficult to reach, pass through or pass through is significantly smaller than other parts, even the grain pile area with zero air volume.
3.3
Ventilation uniformity
During the ventilation process, the uniform degree of ventilation in different grain layers and positions of the entire grain pile.
3.4
Ventilation uniformity evaluation
Use mathematical statistics and indicators to analyze and evaluate the uniformity of mechanical ventilation.
4 Influencing factors of mechanical ventilation uniformity
4.1 The influencing factors of the ventilation system design on the uniformity of mechanical ventilation are as follows.
a) Air duct layout, air duct size, air duct air volume, ventilation path ratio, opening rate of above-ground cage or trough air distributor, air duct resistance
Power and so on.
b) The size and quantity of pipe fittings such as elbows and tees in the wind network, and the bending radius of the elbows.
c) Choose the air volume, wind pressure or power of the fan.
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