cen heat ppt 3

How is pipe sizing for central heating systems calculated?

• Based on the amount of heat required by a room in kW

• Based on the amount of water containing heat in kg/s

• Based on the size of the room

• Based on the temperature of the water

What happens to the pipe size as more heat is needed?

• The pipe size decreases

• The pipe size remains the same

• The pipe size increases

• The pipe size becomes irrelevant

What is used to counteract the resistance to flow in a central heating system?

• A central heating circulating pump

• A water heater

• A pressure valve

• A thermostat

Where is resistance greater in a central heating circuit?

• At the beginning of the circuit

• In the middle of the circuit

• At the end of the circuit

• It is the same throughout

Why is the first section of the pipework in a central heating system the largest in diameter?

• It carries the least amount of water

• It has the least resistance

• It has to carry the most water to feed all heat emitters

• It is the shortest section

What is the term used for the longest circuit in a central heating system?

• Main circuit

• Index circuit

• Primary circuit

• Secondary circuit

What does Column 1 represent in the central heating pipe sizing process table?

• Total heat required for the section

• Section of pipe being sized

• Flow rate through the pipe

• Pressure loss per meter

What is the typical range for the percentage of heat required, allowing for heat loss from the pipe, as mentioned in Column 3?

• 1% to 5%

• 5% to 20%

• 10% to 30%

• 15% to 25%

What does Column 5 indicate in the table?

• Pipe size in millimeters

• Flow rate through the pipe in kg/s

• Effective length of pipework

• Total pascals by section

According to the table, what should be added for every 20 meters of pipe run as a rough guide for heat loss?

• 5%

• 10%

• 15%

• 20%