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ম্যাথ ব্লকস — যোগ, বিয়োগ, গুণ, ভাগ

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Addition (+) — Monthly EB Bill

একটি office floor-এর তিনটি section:

Section A = 35 জন
Section B = 28 জন
Section C = 32 জন
Total = 35 + 28 + 32 = 95 জন

BMS example — total building energy:

Floor 1 meter = 450 kWh
Floor 2 meter = 380 kWh
Floor 3 meter = 520 kWh
Total = 1,350 kWh → energy dashboard-এ দেখানো হয়েছে

Subtraction (-) — Home Water Tank Consumption

Morning tank level = 85%
Evening tank level = 42%
আজকে Consumed    = 85 - 42 = 43%

BMS example — filter differential pressure:

Pressure before filter = 250 Pa
Pressure after filter = 180 Pa
Differential = 70 Pa → যদি 150 Pa-এর উপরে হয় → alarm: filter change করুন

Multiplication (×) — Air Flow Calculation

Air velocity in duct = 4.5 m/s (velocity sensor থেকে)
Duct cross-section area = 0.8 m² (fixed value)
Volume flow rate  = 4.5 × 0.8 = 3.6 m³/s

BMS এটি ব্যবহার করে verify করে যে AHU design অনুযায়ী correct airflow deliver করছে কিনা।

Division (÷) — Average Zone Temperature

Zone 1 = 23°C, Zone 2 = 25°C, Zone 3 = 24°C, Zone 4 = 26°C
Sum    = 98°C
Average = 98 ÷ 4 = 24.5°C → chiller plant optimisation-এর জন্য ব্যবহৃত হয়

একটি faulty sensor পুরো system-কে ভুল পথে চালিত করে না। চারটি sensor-এর Average একটি true floor temperature দেয়।

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