Airwork Ltd

Airwork Ltd AIR-CONDITIONING - REFRIGERATION - ELECTRICAL

Just minding my business
14/04/2026

Just minding my business

The maintenance guy thinks he can fix it himself.Low sub cool on 3 circuits, over current on vfd, and needs updating on ...
28/12/2025

The maintenance guy thinks he can fix it himself.
Low sub cool on 3 circuits, over current on vfd, and needs updating on software. Good luck!

20/11/2025

Duct cleaning improves the overall indoor air quality. The rotary brush powered an electric engine attached to a flexible steel rod allows the brush to get to inaccessible areas to improve the cleaning

HVAC Airflow Calculation from RPM: SimplifiedStepsThis guide covers the essential steps for calculating airflow (CFM) fr...
18/11/2025

HVAC Airflow Calculation from RPM: Simplified

Steps

This guide covers the essential steps for calculating airflow (CFM) from RPM in HVAC systems, ensuring accuracy for your projects.

*

Step 1: Identify Fan Specs

Before beginning, gather the following data from your system:

Fan Diameter (D)

RPM (Revolutions per Minute)

Blade Design / Pitch

*

*

Step 2: Calculate Fan Area (A)

Formula:

A = π X (D2/4)

Where:

A = Fan Area (square feet)

D = Fan Diameter (feet)

🌬️ TYPES OF AHU FILTERS (Air Handling Unit Filters)Filters in an AHU are arranged in stages — from coarse to fine to hig...
13/11/2025

🌬️ TYPES OF AHU FILTERS (Air Handling Unit Filters)

Filters in an AHU are arranged in stages — from coarse to fine to high-efficiency — to ensure clean air supply and protect HVAC equipment and occupants.

🧱 1. Pre Filter (Primary Filter)

Short form: PF / PRF

Function:

Removes large particles like dust, lint, hair, and pollen.

Protects the downstream filters (fine and HEPA).

Efficiency: 80–90% arrestance (G3–G4 class as per EN 779 / ISO Coarse 60–70).

Material: Synthetic fiber, washable media, metal frame.

Used in:

First stage in AHU

Utility areas, production halls, offices, HVAC intake air

Purpose: Increases life of fine and HEPA filters.

🌫️ 2. Fine Filter (Secondary Filter / Intermediate Filter)

Short form: FF

Function:

Removes smaller particles (dust, mold spores, and fine smoke).

Ensures medium air cleanliness before final filtration.

Efficiency: 60–95% (F5–F9 class / ISO ePM1/ePM2.5).

Material: Pleated synthetic or fiberglass media.

Used in:

Second stage in AHU after Pre-filter

Cleanrooms, laboratories, and pharmaceutical areas

Purpose: Protects HEPA filters and improves air quality.

🧪 3. HEPA Filter (High Efficiency Particulate Air Filter)

Short form: HEPA

Function:

Removes microscopic particles, including bacteria and viruses.

Captures particles ≥0.3 µm with ≥99.97% efficiency.

Efficiency Class: H13–H14 (EN 1822).

Material: Fine glass fiber or PTFE media with aluminum separator.

Used in:

Final filtration stage in AHU

Cleanrooms, pharmaceutical manufacturing, operation theaters, semiconductor industries

Purpose: Ensures ultra-clean air for critical processes.

🦠 4. ULPA Filter (Ultra Low Pe*******on Air Filter)

Short form: ULPA

Function:

Removes particles down to 0.12 µm with 99.999% efficiency.

Efficiency Class: U15–U17 (EN 1822).

Used in:

Highly sterile areas — microelectronics, advanced pharma, isolation rooms

Purpose: Achieves maximum purity beyond HEPA levels.

💧 5. Carbon Filter (Activated Carbon Filter)

When you Add Glycol To A chilled water system, you will loose capacity on the chillers, your pumps, and the air handling...
23/10/2025

When you Add Glycol To A chilled water system, you will loose capacity on the chillers, your pumps, and the air handling units.

This is because the glycol becomes thicker as it cools, and it also transfers less heat than water.

This diagram shows a multi-zone HVAC system with one outdoor unit connected to different indoor units — an air handler, ...
19/10/2025

This diagram shows a multi-zone HVAC system with one outdoor unit connected to different indoor units — an air handler, ceiling cassette, and floor-mounted head.

Variable Frequency Drives (VFDs) offer significant advantages for refrigeration compressor units. By allowing precise co...
13/10/2025

Variable Frequency Drives (VFDs) offer significant advantages for refrigeration compressor units. By allowing precise control over the compressor's motor speed, VFDs optimize energy consumption, leading to reduced operational costs. They enable the system to match the cooling load more accurately, enhancing efficiency and reducing wear on components.VFDs also improve system reliability by minimizing stresses and fluctuations in the refrigeration cycle, which can prolong equipment life. The soft start feature reduces inrush currents, protecting electrical systems and lowering maintenance requirements. Furthermore, VFDs can facilitate better temperature and pressure control, enhancing the overall performance of refrigeration systems, contributing to improved product quality and reduced energy waste. Overall, the integration of VFDs in refrigeration applications promotes enhanced operational efficiency, sustainability, and cost-effectiveness.

Evaporative Cooling Explained.Evaporative cooling is a process that leverages the natural principle of evaporation to co...
08/10/2025

Evaporative Cooling Explained.

Evaporative cooling is a process that leverages the natural principle of evaporation to cool air. It’s a simple, cost-effective method widely used in HVAC systems, particularly in hot air and low humidity. Here’s a detailed explanation aimed at mechanical contractors, HVAC service technicians, and mechanical engineers:

Basic Principle

At its core, evaporative cooling occurs when water evaporates into the air, absorbing heat and lowering the air's temperature. This is because evaporation requires energy, which is taken from the air in the form of heat, thereby reducing the air's temperature.

Components of an Evaporative Cooler

An evaporative cooler typically consists of:

A fan: To draw in warm air from the outside.
Water-soaked pads: Air passes through these pads where evaporation takes place.
A water reservoir: To keep the pads soaked.
A pump: To circulate water from the reservoir to the pads.
Vents or ducts: To distribute the cooled air throughout the space.

Process

1. Air Movement: The fan draws warm, dry external air into the unit.
2. Evaporation: The air passes through water-soaked pads, and as water evaporates from the surface of the pads, it absorbs a significant amount of heat from the air.
3. Cooling: The air, now cooler and slightly more humid, is circulated through a duct system into the building or space.
4. Continuous Operation: Water is continuously pumped onto the pads to ensure they remain saturated, and excess water drips back into the reservoir to be recirculated.

Efficiency Factors

Humidity: The efficiency of evaporative cooling diminishes as humidity increases because air with higher moisture content has a reduced capacity to absorb more water.

Airflow: Effective circulation of cooled air and expulsion of hot air are crucial. Proper ventilation ensures that the humidified air doesn’t become stagnant, maintaining the comfort level inside the space.

Address

Ikeja Industrial Area
100242

Opening Hours

Monday 09:00 - 17:00
Tuesday 09:00 - 17:00
Wednesday 09:00 - 17:00
Thursday 09:00 - 17:00
Friday 09:00 - 17:00
Saturday 09:00 - 17:00
Sunday 09:00 - 17:00

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