Rijomac Duct Sizer

RIJOMAC SYSTEM

Controlled Environment Engineering

RJM-DS-001 v3.0

RJM-DS-001 • Version 3.0 • Rebuild

Duct Sizer Engine

Project Input Calculation Result Report

1. Project Information

Project Name

Room / Area

Engineer

Date

Engineering Notes

Duct sizing awal berdasarkan airflow dan velocity. Untuk desain final, verifikasi friction loss, fitting loss, elbow, reducer, diffuser, damper, noise, dan ESP fan.

2. Duct Sizing Input

Airflow

Airflow Unit CFM m3/h L/s

Duct Model Rectangular Duct Round Duct Flat Oval Duct Flexible Duct

Sizing Method By Target Velocity By Fixed Rectangular / Oval Size By Fixed Round / Flex Diameter

Target Velocity

Velocity Unit m/s FPM

Width (mm)

Height (mm)

Round / Flex Diameter (mm)

Preferred Aspect Ratio W:H 1.5 : 1 2 : 1 2.5 : 1 3 : 1 4 : 1

Duct Standard Rijomac Practice SMACNA Reference DW144 Reference ASHRAE Reference Project Specification

Air Density (kg/m3)

Ready.

3. Duct Sizing Result

Airflow-

Velocity-

Required Area-

Recommended Size-

Equivalent Round Diameter	-
Hydraulic Diameter	-
Area in ft2	-
Velocity in FPM	-
Aspect Ratio	-
Reynolds Number	-
Flow Regime	-
Recommendation	-

Duct Visualization

-

-

Engineering Note:
Tool ini untuk sizing awal. Untuk desain final, tetap perlu perhitungan friction loss, fitting loss, leakage, acoustic/noise, balancing damper, diffuser, filter, coil, dan ESP fan.

4. Engineering Report

5. Velocity Reference Library

Application	Typical Velocity	Engineering Note
Quiet Branch Duct	3-5 m/s	Cocok untuk area noise sensitive.
General Branch Duct	4-6 m/s	Umum untuk comfort HVAC.
Main Duct	6-9 m/s	Perlu cek pressure drop dan noise.
Industrial / Short Run	8-12 m/s	Hanya jika noise dan ESP masih aman.
Flexible Duct	2-4 m/s	Sebaiknya pendek dan tidak banyak belokan.

RJM-DS-001 v3.0 • Rijomac Engineering Center • Duct Sizer Engine

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