PSEMIC Engineering Resource Centre

Engineering Calculator – HVAC, District Cooling, Mechanical & Civil

Practical engineering calculators for HVAC, air-conditioning, district cooling, chilled-water systems, civil works, concrete, steel, pipelines, pumps, flanges, bolting, welding, painting, insulation and site estimation.

Important: Results are for preliminary engineering and estimating only. Final design, sizing, torque, welding, pressure testing, coating, structural and equipment decisions must follow approved drawings, manufacturer data, project specifications, applicable codes and competent engineering review.

HVAC & District Cooling

Cooling Load, AC Capacity & CHW Calculators

AC Capacity Estimator – Residential / Commercial

Floor Area (m²)

Ceiling Height (m)

Space Type

Occupants

Glass / Solar Exposure

Insulation

Enter space details.

Simplified preliminary estimator only; use a formal heat-load calculation for final design.

Get commercial cooling / chiller advice from PSEMIC →

Commercial / District Cooling Connected Load

Gross Floor Area (m²)

Cooling Load Density (W/m²)

Diversity Factor (%)

Enter area and load assumptions.

Discuss district cooling / ETS requirements →

TR ↔ kW ↔ BTU/hr

Cooling Capacity (TR)

Enter TR.

Chilled Water Flow Rate

Cooling Capacity (TR)

CHW ΔT (°C)

Enter TR and ΔT.

Cooling Capacity from CHW Flow

Flow (m³/h)

ΔT (°C)

Enter flow and ΔT.

Required Number of Chillers

Plant Capacity (TR)

Unit Capacity (TR)

Additional Standby Units

Enter capacities.

Approximate Supply Airflow

Cooling Capacity (TR)

CFM per TR

Enter capacity.

Heat Exchanger Duty

Water Flow (m³/h)

ΔT (°C)

Enter flow and ΔT.

Get PHEX / ETS advice →

Civil & Construction

Concrete, Plinth, Excavation & Rebar Calculators

Equipment Plinth / Concrete Base

Length (m)

Width (m)

Height / Depth (m)

Quantity

Rebar Allowance (kg/m³)

Concrete Wastage (%)

Enter dimensions.

Rebar quantity is an estimating allowance only. Structural reinforcement must follow approved design drawings.

Get plinth / equipment base advice from PSEMIC →

Concrete Slab Volume

Length (m)

Width (m)

Thickness (mm)

Enter slab dimensions.

Circular Pedestal / Foundation

Diameter (m)

Height (m)

Quantity

Enter dimensions.

Excavation Volume

Length (m)

Width (m)

Depth (m)

Enter dimensions.

Rebar Weight

Bar Diameter (mm)

Total Length (m)

Enter diameter and length.

Approx. kg/m = d² / 162

Formwork Area – Rectangular Plinth

Length (m)

Width (m)

Height (m)

Enter dimensions.

Steel & Fabrication

Steel Weight & Fabrication Calculators

Carbon Steel Pipe Weight

Outside Diameter (mm)

Wall Thickness (mm)

Length (m)

Enter pipe dimensions.

Get pipeline fabrication advice →

Steel Plate Weight

Length (m)

Width (m)

Thickness (mm)

Enter dimensions.

Round Bar Weight

Diameter (mm)

Length (m)

Enter dimensions.

Flat Bar Weight

Width (mm)

Thickness (mm)

Length (m)

Enter dimensions.

PSEMIC welding & fabrication →

Pipeline & Mechanical

Pipe, Flow, Pressure & Thermodynamics

Pipe Velocity

Flow (m³/h)

Internal Diameter (mm)

Enter flow and diameter.

Pipe Water Volume

Internal Diameter (mm)

Length (m)

Enter diameter and length.

Pipe External Surface Area

OD (mm)

Length (m)

Enter OD and length.

Pressure Converter

Pressure (bar)

Enter bar.

Static Water Head ↔ Pressure

Water Head (m)

Enter water head.

Thermal Energy – Water

Water Mass (kg)

Temperature Change (°C)

Enter mass and ΔT.

Steel Pipe Thermal Expansion

Pipe Length (m)

Temperature Change (°C)

Coefficient (µm/m·°C)

Enter values.

Reynolds Number

Velocity (m/s)

Internal Diameter (mm)

Kinematic Viscosity (m²/s)

Enter values.

Flange & Bolting

Bolt Torque & Stress Estimators

Bolt Torque Estimator

Nominal Bolt Diameter (mm)

Target Preload (kN)

Nut Factor K

Enter bolt diameter and preload.

Do not use this value as an approved field torque. Final torque must follow the applicable flange, gasket, bolt material, lubrication condition, approved bolting procedure and project specification.

Get flange & bolting advice from PSEMIC →

Bolt Tensile Stress

Bolt Load (kN)

Tensile Stress Area (mm²)

Enter load and area.

Painting & Coating

DFT, WFT & Paint Quantity Calculators

DFT / WFT Calculator

Required DFT (µm)

Volume Solids (%)

Enter DFT and solids.

Theoretical Paint Coverage

Volume Solids (%)

Target DFT (µm)

Surface Area (m²)

Enter coating values.

Add allowances for practical losses, geometry, overspray and manufacturer recommendations.

Get coating advice from PSEMIC →

Welding Engineering

Heat Input, NDT & Weld Quality Calculators

Welding Heat Input

Arc Voltage (V)

Current (A)

Travel Speed (mm/min)

Efficiency

Enter welding parameters.

PSEMIC welding & fabrication services →

NDT Quantity

Total Weld Joints

Required NDT (%)

Enter joint quantity.

Weld Rejection Rate

Joints Inspected

Joints Rejected

Enter inspection results.

Insulation & Preinsulated Piping

PUF & Cladding Calculators

PUF Insulation Quantity

Pipe OD (mm)

PUF Thickness (mm)

Length (m)

Density (kg/m³)

Enter dimensions.

PSEMIC field-joint insulation services →

Cladding Area

Insulated OD (mm)

Length (m)

Enter insulated OD and length.

Site Estimation

Man-Hours, Pipe Lengths & Progress

Man-Hours Calculator

Crew Size

Hours / Day

Working Days

Enter crew, hours and days.

Commercial Pipe Lengths

Required Length (m)

Standard Length (m)

Enter lengths.

Project Progress

Completed Quantity

Total Quantity

Enter quantities.

Material Wastage Addition

Base Quantity

Wastage (%)

Enter quantity and wastage.

Related PSEMIC Services

Pipeline Supply & Installation →District Cooling Plant & ETS Works →Chiller Installation & Replacement →Pump Installation & Alignment →Plate Heat Exchanger Installation →CHW Testing & Commissioning →Emergency Welding & Fabrication →Pipe Freezing & Hot Tapping →24/7 Emergency Pipeline Repair →

Need More Than a Calculation?

Get Expert Advice from the PSEMIC Engineering Team

Need assistance with cooling-load estimation, district cooling, CHW pipe sizing, equipment plinths, steel quantities, flange bolting, welding, coating, insulation, pressure testing, shutdown planning or specialist mechanical works? Send your requirement to PSEMIC for practical engineering and site support.

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