BSE Chapter 12 Revision Flash Cards

Describe what a Sealed, pressurised central heating system is and how it differs from an open vented system?

• Sealed systems are fed directly from the mains cold-water supply and use an expansion vessel to manage water expansion.

• Open vented systems do not require a filling loop to charge the system with water.

• Sealed systems operate at atmospheric pressure and do not require any additional components.

• Open vented systems are more efficient than sealed systems in terms of energy consumption.

Explain what the purpose is for a Rainwater system?

• To collect and carry away rain from roofs using integrated channels or eaves-mounted gutters connected to rainwater pipes.

• To filter and purify rainwater for drinking purposes.

• To store rainwater for irrigation and gardening.

• To redirect rainwater into underground reservoirs for future use.

How do central heating boilers transfer the heat energy?

• They transfer their heat energy to another medium, usually water or air, which carries the heat to the areas where it is needed.

• They convert heat energy directly into electricity for immediate use.

• They store heat energy in large tanks for later use.

• They release heat energy into the atmosphere without any medium.

Describe the Components as well as their Purpose when used in a ducted air-conditioning system

• Circulation fan (fan coil unit): Moves air to and from rooms

• Heating unit: Provides warmth during winter

• Air purifier: Cleans the air of pollutants

• Dehumidifier: Removes excess moisture from the air

Gas systems supply gas to a property as a source of fuel for heating and cooking. State the two different types of gas:

• Natural gas and Propane

• Natural gas and Butane

• Natural gas and Liquefied petroleum gas (LPG)

• Natural gas and Methane

Describe what a Low pressure, open vented central heating system is?

• A system that uses high pressure and closed vents to circulate water.

• A system supplied by a feed and expansion cistern located in the roof space or tank room, which can be modern or semi-gravity.

• A system that relies solely on gravity to circulate water without any pumps.

• A system that operates at atmospheric pressure and requires no water supply.

Write down what the missing words are from the provided diagram?

• Option A: Diagram A

• Option B: Diagram B

• Option C: Diagram C

• Option D: Diagram D

What are the disadvantages of an Indirect Cold Water System?

• Supply pipe must be protected against backflow from cistern

• Increased efficiency in water delivery

• Lower installation costs

• Reduced maintenance requirements

What is a CWSC?

• Cold-water storage cistern (CWSC) is a Cistern (tank) designed to store water

• A type of water heater used in residential buildings

• A system for purifying drinking water

• A type of water filtration device

All central-heating appliances require a flue to remove the products of combustion (POC) safely to the outside. What is the basic working principal of the flue?

• To produce an updraught, whether by natural means or using a fan, to eject fumes away from the building.

• To circulate warm air within the building to maintain temperature.

• To filter out harmful gases before they exit the building.

• To provide a pathway for fresh air to enter the heating system.