COSC 326 - Exam #2 with all Correct & 100% Verified
Answers |Actual Complete Exam |Already Graded A+
What are the benefits of Distributed HVAC Systems? ✔Correct Answer--Easy to provide zoning
-Direct control by occupants
-Easier independent scheduling for energy savings
-Generally lower capital costs and shorter lead time for equipment
-Don't need dedicated maintenance staff, use service contract
-Can often install on roof, less usable space for equipment
What are the characteristics of a Constant Air Volume (CAV) air handling system? ✔Correct
Answer--Constant zone airflow that is at design year round
-Meet varying loads with varying supply air temperature
What are the characteristics of a Variable Air Volume (VAV) air handling system? ✔Correct
Answer--Constant zone supply air temperature
-Meet varying loads with varying supply airflow
-Allows the fan to meet the load saving electrical power
-Tremendous horsepower savings
What varies with the cube of velocity of the air that is moving through the system? ✔Correct
Answer-Horsepower
What are the characteristics of a Dual Duct (DD) air handling system? ✔Correct Answer--The
air-handling unit has two coils: a cooling coil and heating coil, both of which operate
continuously
-Use constant or variable supply airflow
-The coils feed cool or hot air into designated ducts (cold deck and hot deck)
-The two ducts run parallel to each other throughout the entire building
What is are the characteristics of a Multizone (MZ) air handling system? ✔Correct Answer--
Mix hot and cold air for each zone at the air handler
-These systems are not efficient
What are the characteristics of Air Water Systems? ✔Correct Answer--Use combination of
conditioned air and zone water coils
-Ventilation requires outdoor and and zone heating and cooling
-Zone heating and cooling loads can be met with fan coils
What are the characteristics of a Fan Coil? ✔Correct Answer--One or two coils (use seasonal
valves if one coil for both hot and cold water
-Thermostat controls water flow
, -Ventilation must be met with conditioned or unconditioned outdoor air
What coil is used for just heating OR cooling? ✔Correct Answer-Two Pipe Fan Coil
What coil is used for both heating AND cooling? ✔Correct Answer-Four Pipe Fan Coil
What are the characteristics of Secondary HVAC Equipment and systems? ✔Correct Answer--
Generally in the building
-Control air distribution and water Distribution
-Include air handlers and fan coils
What are the characteristics of Primary HVAC Equipment and Systems? ✔Correct Answer--
Primary sources of heating and cooling
-Chillers and heat rejection
-Boilers
-Engines and generators
-Thermal Storage
How many Megawatts of electricity does Texas A&M generate? ✔Correct Answer-50
How many watts is one Megawatt? ✔Correct Answer-One Million
What is Diffuser Selection? ✔Correct Answer--Throw air out at 10-15 degree angle to deliver
air to a room
-Mix air without causing draft, quietly, with low pressure drop
-Velocities less than 50 fpm (0.25 m/s) in occupied zone
-Diffuser manufacturers report throw: distance where velocity is reduced to specified level
-Beware of change in throw at reduced airflow
What is the Noise Criteria rating for Diffusers in an Auditorium? ✔Correct Answer-20-25
What is the Noise Criteria rating for Diffusers in an Restaurant? ✔Correct Answer-25-30
What is Throw? ✔Correct Answer-The distance where velocity is reduced to a specified level
What are they types of HVAC systems? ✔Correct Answer--Central
-Distributed
What are the benefits of using Central HVAC? ✔Correct Answer--Large equipment has higher
quality, efficiency, and durability standards
-Split system typically lasts 15-16 years, potentially up to 20 years
packaged units last 10-15 years
-Maintenance is concentrated
-Noise is removed from the zone
Answers |Actual Complete Exam |Already Graded A+
What are the benefits of Distributed HVAC Systems? ✔Correct Answer--Easy to provide zoning
-Direct control by occupants
-Easier independent scheduling for energy savings
-Generally lower capital costs and shorter lead time for equipment
-Don't need dedicated maintenance staff, use service contract
-Can often install on roof, less usable space for equipment
What are the characteristics of a Constant Air Volume (CAV) air handling system? ✔Correct
Answer--Constant zone airflow that is at design year round
-Meet varying loads with varying supply air temperature
What are the characteristics of a Variable Air Volume (VAV) air handling system? ✔Correct
Answer--Constant zone supply air temperature
-Meet varying loads with varying supply airflow
-Allows the fan to meet the load saving electrical power
-Tremendous horsepower savings
What varies with the cube of velocity of the air that is moving through the system? ✔Correct
Answer-Horsepower
What are the characteristics of a Dual Duct (DD) air handling system? ✔Correct Answer--The
air-handling unit has two coils: a cooling coil and heating coil, both of which operate
continuously
-Use constant or variable supply airflow
-The coils feed cool or hot air into designated ducts (cold deck and hot deck)
-The two ducts run parallel to each other throughout the entire building
What is are the characteristics of a Multizone (MZ) air handling system? ✔Correct Answer--
Mix hot and cold air for each zone at the air handler
-These systems are not efficient
What are the characteristics of Air Water Systems? ✔Correct Answer--Use combination of
conditioned air and zone water coils
-Ventilation requires outdoor and and zone heating and cooling
-Zone heating and cooling loads can be met with fan coils
What are the characteristics of a Fan Coil? ✔Correct Answer--One or two coils (use seasonal
valves if one coil for both hot and cold water
-Thermostat controls water flow
, -Ventilation must be met with conditioned or unconditioned outdoor air
What coil is used for just heating OR cooling? ✔Correct Answer-Two Pipe Fan Coil
What coil is used for both heating AND cooling? ✔Correct Answer-Four Pipe Fan Coil
What are the characteristics of Secondary HVAC Equipment and systems? ✔Correct Answer--
Generally in the building
-Control air distribution and water Distribution
-Include air handlers and fan coils
What are the characteristics of Primary HVAC Equipment and Systems? ✔Correct Answer--
Primary sources of heating and cooling
-Chillers and heat rejection
-Boilers
-Engines and generators
-Thermal Storage
How many Megawatts of electricity does Texas A&M generate? ✔Correct Answer-50
How many watts is one Megawatt? ✔Correct Answer-One Million
What is Diffuser Selection? ✔Correct Answer--Throw air out at 10-15 degree angle to deliver
air to a room
-Mix air without causing draft, quietly, with low pressure drop
-Velocities less than 50 fpm (0.25 m/s) in occupied zone
-Diffuser manufacturers report throw: distance where velocity is reduced to specified level
-Beware of change in throw at reduced airflow
What is the Noise Criteria rating for Diffusers in an Auditorium? ✔Correct Answer-20-25
What is the Noise Criteria rating for Diffusers in an Restaurant? ✔Correct Answer-25-30
What is Throw? ✔Correct Answer-The distance where velocity is reduced to a specified level
What are they types of HVAC systems? ✔Correct Answer--Central
-Distributed
What are the benefits of using Central HVAC? ✔Correct Answer--Large equipment has higher
quality, efficiency, and durability standards
-Split system typically lasts 15-16 years, potentially up to 20 years
packaged units last 10-15 years
-Maintenance is concentrated
-Noise is removed from the zone
