What is natural drafting?
Natural draft: When air or flue gases flow due to the difference in density of the hot flue gases and cooler ambient gases. The difference in density creates a pressure differential that moves the hotter flue gases into the cooler surroundings.
How does a natural draft work?
Natural Draft is thermal draft. It occurs when heated gases expand. A given volume of hot gas will weigh less than an equal volume of the same gas at a cool temperature. Since hot combustion gases weigh less per volume than room air or outdoor air, they tend to rise.
What is natural draft ventilation?
A house with a natural draught ventilation system has no fan, and the air is admitted instead through valves and gaps in the structure and is discharged through ventilation ducts often built into the chimney breast. The natural draught system is based on fresh air being drawn in through gaps and leakages in the house.
What is a natural draft appliance?
Natural draft appliances are sometimes referred to as draft hood-equipped appliances or atmospheric appliances. Draft hoods are included in these designs to separate the vent system from the appliance burner to decouple the outdoor weather conditions from burner performance.
What is the difference between natural and mechanical draft?
Natural draft cooling towers make use of the chimney operation of the cooling tower. The air flow is caused by the temperature difference between the air inside and outside the cooling tower. The fans used in mechanical draft cooling towers cause the air flow.
How does a natural draft furnace work?
A natural draft furnace is one that uses natural atmospheric pressure to force the waste gasses of combustion out through the ventilation system. As the fuel in the furnace burns, it creates hot air as well as combustion byproducts, such as carbon monoxide and nitrogen dioxide.
What is the difference between forced draft and induced draft?
Forced-draft fans focus the pressure and volume at the outlet of the fan to push air through a system, creating positive air pressure. Industrial induced draft fans operate by focusing the pressure and volume at the inlet of the fan to pull air through a system.
What are the examples of natural ventilation?
1. What is natural ventilation? Natural forces (e.g. winds and thermal buoyancy force due to indoor and outdoor air density differences) drive outdoor air through purpose-built, building envelope openings. Purpose-built openings include windows, doors, solar chimneys, wind towers and trickle ventilators.
What is natural draft burner?
A natural-draft burner is a mechanical device that utilizes the principles of combustion, draft and pressure to produce the airflow necessary to support the intended performance of the heater application.
What does a natural draft hot water boiler mean?
Natural draft: a traditional water heater with a draft hood. Relies on gravity to get the exhaust gas out of the home. Powervent: has a fan on top that pushes the exhaust gas out of the home, typically through a PVC pipe out the side of the house. The water gets instantly heated as it passes through the water heater.
What is the difference between natural draft and mechanical draft cooling towers?
What are the 3 types of cooling towers?
There are three main types of cooling towers that are defined by how water or air pass through them. These types include crossflow, counterflow, and hyperbolic.