GB/T 40150-2021Grain and oil storage—Evaluation of uniformity of grain mechanical ventilation (English PDF)

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.

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.

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.