HVAC

Types of Cooling or HVAC Installations:

Air conditioning (also A/C, air con) is the process of removing heat and controlling the humidity of the air within a building or vehicle to achieve a more comfortable interior environment. This may be achieved using powered devices (‘air conditioners’), by passive cooling or by ventilative cooling. Air conditioning is a member of a family of systems and techniques that provide heating, ventilation and air conditioning (HVAC).

• Air conditioners, which typically use the vapor-compression refrigeration range in size from small units used within vehicles through to massive units that can cool an entire building. Air source heat pumps, which can be used for heating as well as cooling are becoming increasingly common in cooler climates.

• Evaporative coolers lower the temperature of air using the principle of evaporative cooling, unlike typical air conditioning systems which use vapor-compression refrigeration or absorption refrigeration. Evaporative cooling is the conversion of liquid water into vapor using the thermal energy in the air, resulting in a lower air temperature. The energy needed to evaporate the water is taken from the air in the form of sensible heat, which affects the temperature of the air, and converted into latent heat, the energy present in the water vapor component of the air, whilst the air remains at a constant enthalpy value. This conversion of sensible heat to latent heat is known as an isenthalpic process because it occurs at a constant enthalpy value. Evaporative cooling therefore causes a drop in the temperature of air proportional to the sensible heat drop and an increase in humidity proportional to the latent heat gain. Evaporative cooling can be visualized using a psychrometric chart by finding the initial air condition and moving along a line of constant enthalpy toward a state of higher humidity.^[8]
• Vapor-compression refrigeration uses evaporative cooling, but the evaporated vapor is within a sealed system, and is then compressed ready to evaporate again, using energy to do so. A simple evaporative cooler’s water is evaporated into the environment, and not recovered. In an interior space cooling unit, the evaporated water is introduced into the space along with the now-cooled air; in an evaporative tower the evaporated water is carried off in the airflow exhaust.

Where does the Installations take place?

• Domestic – Normal house/ Flat/ RDP/ Qupong
• Industrial – Factories/ Large buildings/ Mall’s/ Shops/ Farms

Pictures of Previous Installations: