Explain how the method of heating water in a direct cylinder has evolved and the reasons for this change.

The method has shifted from direct boiler heating to immersion heaters due to improved temperature and time control and elimination of water discoloration.

The method has shifted from immersion heaters to direct boiler heating because of cost savings.

The method has remained the same due to lack of technological advancements.

The method has shifted to using solar panels for environmental reasons.

What is the function of the thermostat in a direct cylinder system?

To control the temperature of the water

To supply cold water to the cistern

Explain how the immersion heater and thermostat work together to maintain water temperature in a direct cylinder system.

The immersion heater heats the water, and the thermostat monitors and regulates the temperature to prevent overheating.

The thermostat heats the water, and the immersion heater monitors the temperature.

Both the immersion heater and thermostat supply cold water to the cistern.

The immersion heater drains water from the system, and the thermostat controls the flow.

Why is a 20amp heat proof flex used in the connection to the immersion heater in a direct cylinder system?

To safely carry the electrical current required for heating

To drain excess water from the system

What does the term "single feed" refer to in the context of direct cylinders?

The system requires only one feed

The system uses multiple cisterns

The system does not use any cisterns

Which component supplies the cylinder via the cold feed pipe in a direct cylinder system?

CWSC (Cold Water Storage Cistern)

If a direct cylinder system uses a CWSC of 200 litres, what is the likely function of this cistern?

To supply cold water to the cylinder

To store hot water for distribution

To filter impurities from water

Explain why a direct cylinder system only requires a single cistern at a higher level. Use reasoning based on the information provided.

Because the system only needs one feed, simplifying the design

Because multiple cisterns would increase water pressure

Because a single cistern is used for heating water directly

Because the cylinder cannot handle more than one cistern

What is the function of the primary return pipe in an indirect cylinder system?

It allows cooler primary water to return to the boiler to be reheated.

It mixes primary and secondary water.

It adds chemicals to the water.

It removes secondary water from the cylinder.

Explain how the heat exchanger in an indirect cylinder system transfers heat from the primary water to the secondary water.

The primary water flows around the heat exchanger, giving off its heat to the secondary water inside the cylinder.

The secondary water is pumped into the boiler to absorb heat directly.

The heat exchanger mixes both waters together.

The primary water is cooled by air before entering the cylinder.

Why does the separate primary circuit in an indirect cylinder system allow an inhibitor to be used?

Because the primary water does not mix with the secondary water, allowing chemical treatment.

Because the secondary water is always at a lower temperature.

Because the cylinder is made of a special material.

Because the system operates at high pressure.

What is the primary function of the cold feed cistern in an indirect cylinder system?

To supply cold water to the system

To distribute hot water to taps

In an indirect cylinder system, what is the role of the primary flow and primary return pipes?

To circulate heated water from the boiler to the coil type heat exchanger and back

To deliver cold water to the bath and basin

To vent excess steam from the system

To store water in the hot water vessel

Explain how the coil type heat exchanger in an indirect cylinder system helps to keep the domestic hot water supply separate from the boiler water. Use evidence from the diagram to support your answer.

The coil type heat exchanger transfers heat from the boiler water to the domestic water without mixing the two, as the boiler water flows through the coil inside the hot water vessel, heating the surrounding domestic water.

The coil type heat exchanger mixes the boiler water and domestic water directly.

The coil type heat exchanger stores both boiler water and domestic water together.

The coil type heat exchanger only circulates cold water.

What does the term "double feed" refer to in the context of indirect cylinders?

The system requires two feeds and two independent cisterns at higher level.

The system uses a single feed and one cistern.

The system has double the water capacity.

The system uses two cylinders instead of one.

Which component supplies the cylinder via the cold feed pipe in an indirect cylinder system?

The larger (100 or 200 litres) CWSC

The smaller (18 litres) feed and expansion cistern

What is the purpose of the gate valve in the cold feed pipe of an indirect cylinder system?

To prevent water from entering the cylinder

How does the smaller (18 litres) feed and expansion cistern maintain the water level in the primaries?

By supplying water via a feed pipe to the primary return

By directly feeding the cylinder

By controlling the cold feed pipe

By mixing with the larger cistern

If the larger CWSC is not functioning, what impact would this have on the indirect cylinder system?

The cylinder would not be supplied via the cold feed pipe, potentially stopping its operation.

The expansion cistern would take over all functions.

The system would continue to operate normally.

The gate valve would automatically open to compensate.

What happens as the CWSC fills the prismatic cylinder?

The primaries are filled at the same time

Explain the basic working principle of a prismatic cylinder as a heat exchanger. (DoK Level 2)

It uses a single feed system where the CWSC fills the cylinder and simultaneously fills the primaries, allowing heat exchange.

It uses a double feed system to separate hot and cold water.

It relies on electrical heating only.

It stores water without any heat exchange.

A technician is asked to replace an old prismatic cylinder with a modern system. What key difference should they consider regarding the filling process? (DoK Level 3)

Modern systems may use separate feeds for primaries and cylinder, unlike prismatic cylinders which fill both simultaneously.

Modern systems always use the same filling process as prismatic cylinders.

Prismatic cylinders require manual filling, while modern systems are automatic.

Modern systems do not use heat exchangers.

Which of the following is a characteristic of unvented cylinders?

They require a CWSC in the loft.

They operate under low pressure.

Their feed is from a storage tank.

Why are unvented cylinders known as high pressure systems?

Because they operate under mains pressure.

Because they have an open vent.

Because they use a CWSC in the loft.

Because they are fed from a storage tank.

Explain why unvented cylinders do not require a CWSC in the loft.

Because their feed is from the rising main, not from a storage tank in the loft.

Because they have an open vent.

Because they operate at low pressure.

Because they are only used in commercial buildings.

Explain the difference between direct and indirect heating methods for unvented cylinders, and discuss why a customer might choose one over the other.

Direct heating uses an internal element, while indirect heating uses an external source; customers may choose based on energy efficiency or compatibility with existing systems.

Direct heating uses solar panels, while indirect heating uses gas; customers may choose based on cost.

Direct heating is only for small cylinders, while indirect heating is for large cylinders; customers may choose based on size.

Direct heating is faster, while indirect heating is slower; customers may choose based on speed.

If a hot water system is upgraded to use a renewable or alternative heat source, what change must be made to the hot water cylinder?

The cylinder must be made larger

Explain why additional coils are required in a hot water cylinder when incorporating a renewable or alternative heat source.

To allow multiple heat sources to heat the water efficiently

To increase the water storage capacity

To reduce the cylinder's weight

To prevent corrosion inside the cylinder

What are two options for additional coils in hot water cylinders to link other heat sources?

Primary coil and Secondary coil

Explain how additional coils in a hot water cylinder can increase the flexibility of heat sources used.

By allowing multiple heat sources to be connected, such as solar heating and other renewable or non-renewable sources, additional coils (like triple or quad coils) enable the cylinder to utilize different energy inputs for heating water.

By making the cylinder smaller and more portable.

By reducing the amount of water the cylinder can hold.

By preventing any heat loss from the cylinder.

6035HWPPT2

Authored by William Heron

Physics

12th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a type of cylinder mentioned in the components list?

Direct

Indirect

Triple feed

Double feed

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of cylinder is designed to recover heat quickly?

Un-lagged cylinder

High recovery cylinder

Indirect cylinder

Double feed cylinder

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain why a pre-lagged cylinder might be preferred over an un-lagged cylinder in a heating system.

Pre-lagged cylinders retain heat better, reducing energy loss.

Pre-lagged cylinders are smaller in size.

Pre-lagged cylinders are less expensive to manufacture.

Pre-lagged cylinders require more maintenance.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following cylinder types does NOT require a vent?

Unvented cylinder

Direct cylinder

Indirect cylinder

Single coil cylinder

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a characteristic of a direct cylinder?

It has a heat exchanger (coil) inside it.

Water inside can be heated directly from the boiler.

Water inside can be heated via an immersion heater.

It offers no discoloration to the water when using immersion heaters.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main disadvantage of heating water directly from the boiler in a direct cylinder?

Lack of temperature control and discoloration of secondary water

High energy efficiency

Better temperature and time control

No discoloration to the water

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is the use of immersion heaters preferred over direct heating from the boiler in direct cylinders today?

Immersion heaters offer better temperature and time control and prevent discoloration of water.

Immersion heaters are less expensive to install.

Immersion heaters require less maintenance.

Immersion heaters use less electricity.

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6035HWPPT2

Which of the following is NOT a type of cylinder mentioned in the components list?

Which type of cylinder is designed to recover heat quickly?

Explain why a pre-lagged cylinder might be preferred over an un-lagged cylinder in a heating system.

Which of the following cylinder types does NOT require a vent?

Which of the following is NOT a characteristic of a direct cylinder?

What is the main disadvantage of heating water directly from the boiler in a direct cylinder?

Why is the use of immersion heaters preferred over direct heating from the boiler in direct cylinders today?

Explain how the method of heating water in a direct cylinder has evolved and the reasons for this change.

Which component in a direct cylinder system is responsible for heating the water?

What is the function of the thermostat in a direct cylinder system?

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