BU2 Quiz 100

30問 • 1年前

問題一覧

The amount of heat that must be added to or removed from a unit mass of substance in order to change its temperature by one degree.

Specific Heat

How many tons of refrigeration effect (TR) should a convention hall need to accommodate 4,000 people, considering an average human body generates 400 BTUs?

None of those mentioned

What type of heat is removed from the room to be conditioned when the refrigerant passes through the evaporator?

Latent Heat

How much enthalpy is required to turn a 2-kg. ice into water at a desired temperature of 70-deg. F?

800 BTU

What type of heat transfer process happens in a human body when he enters a conditioned room or space?

Convection

How much latent heat of fusion is required to melt a 1.927-ton of ice?

554,976 BTU

How does a human body feel when he is in a cold environment and the humidity is high?

Feels Colder

What becomes of the refrigerant that passes through from the condenser and to the thermostatic expansion valve (TEV)?

High temperature, high pressure liquid

What type of heat transfer process happens when a human body is exposed to the environment, regardless of the air movement?

Radiation

How much amount of latent heat should be added to melt a pound of ice?

144 BTUs

These cooling tower types push air through the tower from an inlet to an exhaust; it is a blow-through arrangement, where a blower type fan at the intake forces air through the tower.

Forced draft cooling towers

What correction should be done to achieve thermal comfort, if the air temperature in a room is on the high side?

Reduced humidity

When air and surface temperatures equal our body temperature, what is the most essential heat flow process to cool our body?

Evaporation

It is a type of centralized air conditioning system that uses refrigerant or chilled water to cool air in the AHU, and the cooled air subsequently distributed through ductworks.

All-air system

What becomes of the refrigerant when it passes through from the cooling coil and to the compressor?

Low temperature, low pressure vapor

These are chiller compressors used in smaller systems up to 100 tons and are typically more efficient, although they produce more vibration.

Reciprocating compressors

It is that form of heat which causes a change in temperature when it is added or removed.

Sensible heat

How much enthalpy should be taken out and turn into ice a 450-gram of water that is in a room temperature of 85-deg F?

197 BTU

How much enthalpy must be removed from a volume of steam and turn it into a 2-kg. of water at a desired temperature of 70-deg. F?

4839 BTU

What type of heat is released when the refrigerant passes through the condenser?

Latent heat

This system of centralized air conditioning directly use fan-coil units to provide the local temperature making it the most compact of all, however, sacrificing indoor air quality.

All-water system

What is the state of the refrigerant that passes through from the thermostatic expansion valve (TEV) to the evaporator or cooling coil?

Low temperature, low pressure liquid

These chiller compressors have two threaded inter-fitting rotors coupled together to compress the volume occupied by the refrigerant; its refrigeration capacity of twin-screw compressors is normally used in the 200- to 800-ton range.

Rotating screw compressors

What is the Energy Efficiency Ratio (EER) of a cooling unit with a capacity of 28,800 BTU/h and an input power of 2.4Kw?

It is defined as the heat load in a room that has to be removed in order to achieve a certain room temperature and humidity.

Cooling load

What type of heat is released when the refrigerant passes through the thermostatic expansion valve?

Sensible heat

What type of heat is added when the refrigerant enters the compressor?

Sensible heat

What is the state of the refrigerant that passes through from the compressor and the condenser?

High temperature, high pressure vapor

What type of heat flow process occurs when the temperature inside a building is lower than that on the outside?

Conduction

How much enthalpy is required to turn into steam a 450-gram of water that is in a room temperature of 85-deg. F?

1097 BTU

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Mat · 43問 · 1年前

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