Heat Ventilation & Air Condition

  Question 1. What Is a Local Comfort Cooling System? Answer : They may be integrated, with heating, ventilation, and air conditioning provided by a single system, for example, air handling units connected to ductwork, or they may be a combination of separate systems, for example, mechanical ventilation but with radiators for heating and local comfort cooling units. Question 2. What Is a Centralised Air System? Answer : The most common central cooling system is a split system, which includes an outdoor cabinet containing a condenser coil and compressor, and an indoor evaporator coil, usually installed in conjunction with your furnace. or air handler. The compressor pumps a chemical called refrigerant through the system. Question 3. What Is Constant Volume System? Answer : Constant Air Volume (CAV) is a type of heating, ventilating, and air-conditioning (HVAC) system. In a simple CAV system, the supply airflow rate is constant, but the supply air temperature is varied to meet the th...

  Guide to designing ductwork systems How to design a duct system. In this article, we’ll be learning how to size and design a ductwork system for efficiency. Methods of ductwork design There are many different methods used to design ventilation systems, the most common ways being: Velocity reduction method: (Residential or small commercial installations) Equal friction method: (Medium to large-sized commercial installations) Static regain: Very large installations (concert halls, airports, and industrial) We’re going to focus on the equal friction method in this example as it’s the most common method used for commercial HVAC systems and it's fairly simple to follow. Design example The Building Layout So we’ll jump straight into designing a system. We’ll use a small engineering office as an example and we want to make a layout drawing of the building which we’ll use for the design and calculations. This is a really simple building it has just 4 offices a corridor and a mechanical r...