- Identify materials that can serve as a nonpermeable VDR.
- What is zoning?
- Describe the types of HVAC distribution system classifications.
- Describe the types of HVAC air distribution system arrangements.
- Describe the types of pipe arrangements used in allwater and air-water HVAC distribution systems.
- Explain the components and operation of a water-loop heat pump (WLHP) system.
- Explain the operation of a conventional mixed-air ventilation system.
- Explain the operation of a displacement ventilation system.
- Explain the operation of a demand controlled ventilation (DCV) system.
- Explain the components and operation of an air-side economizer.
- Describe the operation of night ventilation precooling (night flush ventilation).
- How does a higher altitude affect performance of a HVAC system? What is affected?
- A fan in a residential furnace is needed to move 1700 standard cfm (ft3/min) of warm air at a temperature of 120°F. The fan will be installed in a building at an elevation of 6000 ft above sea
- A fan in an AHU is needed to move 20 000 standard cfm (ft3/min) of warm air at a temperature of 130°F. The fan will be installed in a building at an elevation of 5000 ft above sea level. Approximate
- For the conditions in the previous exercise, describe a good strategy for use of a vapor diffusion retarder.Data from in previous exerciseA building has indoor air conditions of 70°F dry bulb
- The heating load of a building at winter design conditions is 1 510 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial gas-fired hot water boilers provided in
- The heating load of a building at winter design conditions is 3 210 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial oil-fired hot water boilers provided in
- The heating load of a building at winter design conditions is 3 600 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial dual fuel (gas- and oil-fired) hot water
- A 10 ft long copper baseboard unit is designed to output 550 Btu/hr per ft at standard design conditions. Estimate its output at 5000 ft above sea level.
- Make a visit to a residence. Examine the HVAC system. Make a sketch of the system and identify chief components of the system. Write out control strategies used.
- Make a visit to a commercial building. Examine the HVAC system. Identify chief components of the system. Describe control and energy management strategies used.
- Review a set of construction drawings of a residence. Examine drawings of the HVAC system. Make a sketch of the system and identify chief components of the system.
- Review a set of construction drawings of a commercial building. Examine drawings of the HVAC system. Make a sketch of the system and identify chief components of the system.
- What are the advantages of a forced-air system as compared to a hot water system?
- What types of materials are most commonly used for forced-air ducts?
- What can be done to ensure that the system will be as quiet as possible?
- What is the purpose of putting dampers in the ductwork?
- What is the purpose of putting turning vanes in the ductwork and where are they used?
- When is insulation around the ductwork recommended?
- When heating is the predominant function of the forced-air system, what are the recommended locations for the supply and return?
- Describe the layout of an extended plenum ductwork arrangement.
- Describe the layout of a reducing plenum ductwork arrangement.
- Describe the layout of an individual supply ductwork arrangement.
- Describe the layout of a perimeter loop ductwork arrangement.
- Describe the single-zone and multizone constant air volume systems. Explain the differences between the systems.
- How does the equivalent diameter of a duct relate to a rectangular duct section?
- Which duct system is more common, the low-velocity or high-velocity system?
- Why should air velocity in the ducts be kept below certain limits? Give two reasons.
- Why must automatic dampers be designed to operate so they close gradually?
- What term is commonly used to refer to the cooling capacity of a cooling unit, and how does it relate to Btu/hr?
- What does the term SEER mean, and why is it important to check the SEER of the cooling unit?
- What type of equipment may be used when both heating and air conditioning are required?
- What factors determine where the supplies and returns are located?
- Determine the perimeter length (in inches) and aspect ratio of the following ducts:a. 12 in × 12 inb. 18 in × 12 inc. 24 in × 12 ind. 36 in × 12 ine. 48 in × 12 in
- For the duct sizes in the previous exercise, which duct section uses the least material?
- Determine the perimeter length (in inches) and aspect ratio of the following ducts:a. 8 in × 8 inb. 16 in × 8 inc. 24 in × 8 ind. 32 in × 8 ine. 40 in × 8 in
- For the duct sizes in the previous exercise, which duct section uses the least material?
- Determine the perimeter length (in mm) and aspect ratio of the following ducts:a. 200 mm × 200 mmb. 400 mm × 200 mmc. 600 mm × 200 mmd. 800 mm × 200 mme. 1000 mm × 200 mm
- For the duct sizes in the previous exercise, which duct section uses the least material?Data From Previous ExerciseDetermine the perimeter length (in mm) and aspect ratio of the following ducts:a.
- Determine the equivalent diameter of the following ducts:a. 12 in × 12 inb. 18 in × 12 inc. 24 in × 12 ind. 30 in × 12 ine. 48 in × 12 in
- Determine the equivalent diameter of the following ducts:a. 8 in × 8 inb. 16 in × 8 inc. 24 in × 8 ind. 32 in × 8 ine. 40 in × 8 in
- The minimum required equivalent diameter of a duct is 16 in but is too deep for the ceiling clearance allowed by the architect’s design. The vertical clearance available for ductwork is 12 in.
- The minimum required equivalent diameter of a duct is 30 in but is too deep for the ceiling clearance allowed by the architect’s design. The vertical clearance available for ductwork is 20 in.
- The minimum required equivalent diameter of a duct is 34 in but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork is 24 in.
- The minimum required equivalent diameter of a duct is 500 mm but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork in the space
- The minimum required equivalent diameter of a duct is 900 mm but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork is 400 mm.
- A 12 in diameter galvanized steel (smooth) straight duct section conveys air at 1000 ft3/min. It is 100 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
- A 24 in diameter galvanized steel (smooth) straight duct section conveys air at 5000 ft3/min. It is 50 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
- A 20 in diameter galvanized steel (smooth) straight duct section conveys air at 3000 ft3/min. It is 45 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
- A 34 in diameter galvanized steel (smooth) straight duct section conveys air at 10 000 ft3/min. It is 42 ft long.a. Determine the pressure loss, in inches of w. c.b. Determine the average velocity of
- A 500 mm diameter galvanized steel (smooth) straight duct section conveys air at 2000 L/s. It is 21 m long.a. Determine the pressure loss, in Pa/m.b. Determine the average velocity of air flowing
- A 250 mm diameter galvanized steel (smooth) straight duct section conveys air at 500 L/s. It is 21 m long.a. Determine the pressure loss, in Pa/m.b. Determine the average velocity of air flowing
- A branch duct will convey air at a volumetric flow rate of 500 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
- A branch duct will convey air at a volumetric flow rate of 5000 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
- A branch duct will convey air at a volumetric flow rate of 8000 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
- Design a forced hot air system for the residence in Appendix D based on the heat loss calculations for the geographic location where you reside.Appendix D SHINGLES
- A branch duct will convey air at a volumetric flow rate of 8000 L/s. The pressure loss available for this duct is 10 Pa/m. The duct is not lined.a. Identify the minimum diameter of a round duct.b.
- Design a forced-air heating and cooling system for the residence in Appendix D based on the geographic location where you reside.Appendix D SHINGLES (DARK) SHEATHING FASCIA SCREENED VENT 3/8" PLYWOOD
- A branch duct will convey air at a volumetric flow rate of 1000 L/s. The pressure loss available for this duct is 10 Pa/m. The duct is not lined.a. Identify the minimum diameter of a round duct.b.
- Design a forced-air heating and cooling system for one of the top-floor apartments and one of the lower-floor apartments in Appendix A based on the geographic location where you reside.Appendix A
- What are the four different hot water piping arrangements commonly used in residential and light commercial installations? Describe each.
- What are the differences between series loop and onepipe hot water systems? What are the advantages of each?
- Discuss the two-pipe system, how it works, and its advantages and disadvantages.
- Why are multiple heating circuits (zones) often used?
- How does a radiant hot water heating panel work?
- Describe the following components of a boiler configuration in a hydronic system:a. Expansion tankb. Circulating pumpc. Flow control valved. Safety relief valvee. Air elimination device
- What is the one variable that affects the amount of heat given out by a finned tube convector?
- Describe the following heat distribution device or terminal unit available to distribute heat to a space:a. Convector unitb. Fan coil unitc. Radiatord. Radiant floor unite. Radiant wall unit
- What type of system is most commonly used in a residence?
- A 21⁄4 in × 5 in × 0.011-1-in copper-aluminum fin tube baseboard convector has an output of 840 Btu/hr per foot of tube at a fluid temperature of 180°F. A room in a residence has a heating load
- A 23⁄4 in × 5 in × 0.020-11⁄4-in copper-aluminum fin tube baseboard convector has an output of 850 Btu/hr per foot of tube at a fluid temperature of 180°F. A classroom in an elementary school
- Design a series loop system, two zones, for the residence in Appendix D, based on the heat loss calculations for the geographic location where you reside.Appendix D SHINGLES
- A 23⁄4 in × 5 in × 24 gauge-11⁄4-in steel tube convector has an output of 710 Btu/hr per foot of tube at a fluid temperature of 180°F. A classroom in an elementary school has a heating load of
- A 23⁄4 in × 5 in × 24 gauge-11⁄4-in steel tube convector has an output of 860 Btu/hr per foot of tube at a fluid temperature of 200°F. A classroom in an elementary school has a heating load of
- Design a series loop system, one zone, for the apartments in Appendix A, based on the heat loss calculations for the geographic location where you reside.Appendix A
- Discuss the advantages and disadvantages of electric heating systems.
- What is the primary reason that electric heating systems are used?
- What are the types of electric resistance heating systems?
- What model code typically governs the installation of electric resistance heating systems?
- Determine the output of a 1.5 kW electric resistance heater (100% efficient), in Btu/hr.
- A packaged terminal air conditioning unit is specified as “One-ton PTAC with 3.5 kW Electric Heater.” Determine the output of the heater (100% efficient), in Btu/hr.
- A packaged terminal air conditioning unit is specified as “One-ton PTAC with 5.0 kW Electric Heater.” Determine the output of the heater (100% efficient), in Btu/hr.
- An electric resistance duct heater is rated at 21.5 kW. Determine the output of the heater (100% efficient), in Btu/hr.
- One manufacturer’s brand of cabinet heaters is rated from 2 kW to 32 kW. Determine the range of heater output for this brand (100% efficient), in Btu/hr.
- Electric resistance baseboard convectors are under consideration for heating a vacation home. The bedroom has a design heating load of 4000 Btu/hr. Identify the length of unit (in feet) needed to
- Series A high-output, electric resistance baseboard convectors are under consideration for heating a vacation home. The bedroom has a design heating load of 4800 Btu/hr. Identify the length of unit
- Series B high-output, electric resistance baseboard convectors are under consideration for heating a vacation home. The bedroom has a design heating load of 11 000 Btu/hr. Identify the length of unit
- Electric baseboard heaters will be used to heat a room with a design heating load of 5050 Btu/hr. Identify the length of each of the following units (in feet) required to meet the load.a. Standard
- Electric baseboard heaters will be used to heat a room with a design heating load of 3500 Btu/hr. Identify the length of each of the following units (in feet) required to meet the load.a. Standard
- Design an electric baseboard heating system for the residence in Appendix D, based on the heat loss calculations for the geographic location where you reside.Appendix D SHINGLES