HVAC Basic

In a refrigeration system, the low-pressure, low-temperature vapor is converted into a high-pressure, high temperature vapor by the _____.

• compressor

• evaporator

• expansion device, metering device

• condenser

The main purpose of a condenser in a cooling system is to _____.

• store liquid refrigerant

• remove heat from the refrigerant

• remove water from the refrigerant

• add heat to the refrigerant

The main purpose of an evaporator in a cooling system is to _____.

• store liquid refrigerant

• remove heat from the refrigerant

• remove water from the refrigerant

• transfer heat into the refrigerant

The basic concept of LEED is to _____.

• Reduce the cost of buildings and structures

• To raise funds for social city networks

• Design buildings or structures to have minimal impact on the environment.

• Formally direct builders to high cost suppler's to main a monopoly.

What is the definition of the term Heat Transfer?

• The transfer of heat from a cooler substance to a warmer substance

• The transfer of heat from a warmer substance to a cooler substance

• The installation of insulation in the walls of a structure

• The removal of insulation from a structure

What is the purpose of an expansion device in a refrigeration system?

• Absorbs heat

• Is a heat exchanger

• Creates pressure

• Provides a pressure drop of refrigerant in a system

The term Hydronic system refers to _______.

• a system that uses wood for a heat medium

• a system that uses coal for a heat medium

• a system that used water for a heat medium

• A system that uses air far a heat medium

The term ventilation means _____.

• the introduction of fresh air into a confined space in order to control air quality,

• The cooling of air in a confined space to control the moisture content.

• making sure there's is no infiltration of unwanted odors.

• a requirement by LEED that air pressure stay constant and no air changes happen over a certain period of time.

What part of the refrigeration system would you find refrigerant in a low pressure liquid phase?

• between the evaporator and compressor

• between the compressor and condenser

• between the condenser and metering device

• between the metering device and evaporator

What is required if an evaporator operates below 32 degrees F?

• defrost system

• special thermostat

• new evaporator

• new compressor