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MEP Engineering Calculators Suite

7 quick-reference engineering calculators for HVAC Tonnage, Substation Sizing, Cable Voltage Drop, APFC Power Factor, Duct Airflow, Solar PV Sizing, and Fire Pump Head.

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Explore our standalone engineering portal featuring 20 certified calculators with advanced de-rating factors, psychrometric coil analysis, busbar short-circuit bracing, cleanroom ACPH & HEPA sizing, ISO 8528 DG sizing, and printable PDF compliance reports.
Open 20-Tool Subdomain ↗ ⚡ Electrical (10 Tools) ❄️ HVAC / Cleanroom (10 Tools)
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ASHRAE & IS 1391 Heat Load Formula

HVAC Cooling Tonnage Calculator

Total Floor Area (Sq. Ft.)
Climate & Insulation Rating
Average Occupants (People)
Equipment Heat Load (Watts)
Calculated HVAC Scope
50.8 TR
Calculated Net Cooling Tonnage
610,000 BTU/hr
Total Heat Load
60 TR VRF/Chiller Plant
Recommended Standard Commercial Equipment Size
20,320 CFM
Recommended Airflow Capacity
⚡ Dedicated Subdomain Tools ASHRAE / IS 1391
Calculate detailed sensible vs latent heat loads, psychrometric coil ADP, or chiller plant lifecycle payback on our dedicated portal:
❄️ Full HVAC Heat Load Sizing (Tool 6) ↗ 🌡️ Psychrometric Cooling Coil & ADP (Tool 16) ↗ 📊 Chiller Plant 15-Yr LCC & Payback (Tool 20) ↗
IS 2026 / NBC 2016 Sizing Standard

Electrical Substation & Transformer Sizing

Lighting Load (kW)
Raw Power Sockets Load (kW)
HVAC Compressor & Pumps (kW)
Machinery & Motor Loads (kW)
Diversity Factor
Target Power Factor
Substation Engineering Output
200 kVA Substation
Recommended Standard Transformer Rating
155 kW
Total Connected Load
124 kW
Peak Maximum Demand
200 kVA DG Backup
Recommended DG Generator Capacity
⚡ Dedicated Subdomain Tools IS 2026 / ISO 8528
Calculate core & copper losses, transformer impedance, generator step-loading, or busbar fault bracing:
⚡ Transformer Sizing & Losses (Tool 1) ↗ 🔋 DG Set Prime / Standby Sizing (Tool 4) ↗ 📐 Busbar Sizing & Fault Bracing (Tool 11) ↗
IS 7098 / IEC 60364 Standard

Cable Sizing & Voltage Drop Calculator

Feeder Load (kW) — 3 Phase 415V
Route Cable Length (Meters)
Load Power Factor
Cable Engineering Selection
35 sq.mm 4C Armored
Recommended XLPE Aluminum Cable
122.8 Amps
Full Load Current
7.35 V (1.77%)
Calculated Route Voltage Drop
PASSED (IS 7098 Compliant < 3%)
Voltage Drop Compliance Status
⚡ Dedicated Subdomain Tools IS 7098 / IS 3043
Calculate cable sizing with soil/ambient derating, short-circuit withstand, and earth conductor strip sizing:
🔌 Advanced Cable Sizing & Derating (Tool 2) ↗ ⚡ Earthing Strip & Conductor Sizing (Tool 5) ↗ 📐 Busbar Ampacity & Short Circuit (Tool 11) ↗
IS 13585 Standard

APFC Capacitor Bank Calculator

Active Facility Load (kW)
Initial Power Factor (Measured)
Target Power Factor
APFC Panel Sizing
102 kVAR
Required Compensation Capacity
125 kVAR APFC Panel
Recommended Automatic APFC Panel Size
₹ 367,200 / Year
Estimated Power Factor Penalty Savings
⚡ Dedicated Subdomain Tools IS 13585 / IEC 60831
Calculate multi-stage APFC step distribution, detuned harmonic reactors (7%/14%), and motor MCC protection:
💡 APFC Bank & Step Distribution (Tool 3) ↗ ⚙️ Motor Starter & MCC Protection (Tool 14) ↗ 🔋 Online UPS & Battery Bank Sizing (Tool 15) ↗
ASHRAE Equal Friction Method

Duct Sizing & Airflow CFM

Required Airflow Rate (CFM)
Design Air Velocity (FPM)
Duct Dimensions Output
35" W × 23" H
Recommended Rectangular Duct Size
8.00 sq.ft
Cross Sectional Duct Area
22 SWG GI
Recommended Galvanized Sheet Gauge
⚡ Dedicated Subdomain Tools SMACNA / IS 655
Calculate equivalent circular/flat-oval duct, total ESP static pressure loss, or chilled water hydronics:
💨 Equal Friction Duct & Sheet Gauge (Tool 8) ↗ 🌀 Fan ESP Static Pressure Loss (Tool 10) ↗ 🚰 Chilled Water Pipe Hydronics (Tool 9) ↗
MNRE & IEC 61724 Standard

Solar Panel & Rooftop PV Sizing

Monthly Electricity Bill Units (kWh)
Average Peak Sun Hours / Day
Rooftop Solar Plant Output
41.7 kWp Solar Plant
Recommended Rooftop PV Capacity
3,750 sq.ft
Required Shade-Free Roof Area
60,882 kWh / Year
Estimated Annual Clean Energy Generation
3.9 Years
Estimated Financial Payback Period
⚡ Dedicated Subdomain Tools MNRE / IEC 61724
Calculate solar inverter capacity, generation degradation, battery bank autonomy, and UPS backup:
☀️ Rooftop Solar PV System Sizing (Tool 12) ↗ 🔋 Industrial Battery Bank & UPS (Tool 15) ↗ ⚡ Solar Earth Pit & Strip Sizing (Tool 5) ↗
NBC 2016 Part 4 / NFPA 20 Standard

Fire Fighting Pump Head Calculator

Occupancy & Hazard Classification
Building Height (Meters)
Active Hydrant Outlets
Fire Fighting Pump Sizing
60 HP Main Electric Pump
Main Fire Pump Motor Rating
10,800 LPM (2,851 GPM)
Main Hydrant Flow Rate
95 Meters Head
Required Total Dynamic Head (TDH)
10 HP Jockey Pump
Pressure Maintenance Jockey Pump
⚡ Dedicated Subdomain Tools NBC 2016 / ISO 14644
Calculate high-rise stairwell pressurization airflow, door leakage, or cleanroom ACPH & HEPA air filtration:
🚪 Stairwell Pressurization Fan Sizing (Tool 18) ↗ 🏥 Cleanroom ACPH & HEPA Module Sizing (Tool 7) ↗ 🚿 Cleanroom Air Shower & Pass Box (Tool 19) ↗
High-Precision MEP Platform

Complete 20-Calculator Engineering Directory

Full-featured engineering calculators hosted on our dedicated subdomain tools.rsele-hvac.com with complete standards references, downloadable technical sheets, and BOQ estimation.

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⚡ Electrical & Power Suite
10 Tools
Explore Electrical Hub (10 Tools) ↗
❄️ HVAC & Cleanroom Suite
10 Tools
Explore HVAC Hub (10 Tools) ↗
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Google Business Profile — Verified Reviews

Real engineering performance and project delivery feedback from plant heads, facility directors, and commercial developers across North India.

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RK
Rajesh Kumar
★★★★★
Verified GBP
"RS Electricals handled our 33kV substation installation and industrial HVAC for our manufacturing plant in Mohali. Exceptional engineering discipline, zero hot-cutover downtime, and completed on schedule."
AS
Amit Sharma
★★★★★
Verified GBP
"Turnkey HVAC cleanroom installation for our pharma manufacturing unit in Baddi. ISO 14644 compliance and pressure cascades passed inspection in first attempt. Highly recommended MEP partner."
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Gurpreet Singh
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Verified GBP
"Professional building automation (BMS) and fire fighting system execution for our commercial IT park in Chandigarh. Their 24/7 AMC team response in Tri-city is unmatched."
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Vikram Nayyar
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Verified GBP
"Seamless electrical panel (MCC/APFC) design and transformer switchyard setup in Ludhiana. Transparent BOQ with zero surprise variation costs."
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Dr. S. Mehta
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Verified GBP
"NABH compliant hospital OT air handling and essential UPS backup electrical setup. The team executed the project with absolute precision and safety."
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Harpreet S. Gill
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Verified GBP
"Complete commercial tower MEP electrification and VRF air conditioning installation in Mohali. Excellent team, transparent BOQ, and zero delay."
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