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Residential Heat Load Calculations
1.
The purpose of a home air conditioner is to move heat from inside the home to the outside by
a) Absorbing the heat from the inside air into the condenser.
b) Means of radiation and air distribution.
c) Absorbing the heat from the inside air into the evaporator
d) Means of infiltration and distribution.
2.
What document gives the designer an opportunity to see if any of the calculated values are out of Iine?
a) Shell delta T used in the Ioad estimate.
b) The design catalog.
c) Heat Gain/loss Summary
d) An infrared camera.
3.
What is blower door test equipment used for?
a) A testing apparatus used for measuring building envelope air tightness
b) Ventilation system Performance Verification.
c) Measuring the cubic feet per minute of the fan in the central air conditioner.
d) Establishing the average recovery rate of the heater with maximum ventilation.
4.
When calculating thermal loss or gain
a) Measurements must be done twice to be sure
b) Fractional measurements are usually rounded to the next or nearest whole number.
c) Measurements must be made to feet and fractions of an inch.
d) Many measurements can be estimated by the designer.
5.
What is the perimeter in feet of exposed wall for the entire house provided?
a) 86’
b) 166.33’
c) 172’
d) 139’
6.
Glass with a textured surface which provides low visibility and allows in natural light is called
a) Frosted Layer
b) Heat resistant glass.
c) One-way mirror.
d) Obscure glass.
7.
Ventilation is important to the home owner because
a) Too much ventilation may increase oxygen levels to reach unsafe occupant conditions.
b) The department of energy imposes fines on excessive ventilation practices.
c) Increased ventilation may reduce equipment size and operating cost.
d) Too little ventilation may result in improper equipment size and poor indoor air quality
8.
Find the heat gain for the exposed wall and knee-wall. The building is 20’ wide with an exterior wall height of 8’. The roof has a 6 on 12 pitch. Insulation R-11 Outdoor Summer design temperature 95-degree F. Indoor design Temperature 70 degree F. Attic temperature 145 degree F.
a) 705 BTU/h
b) 1,433 BTU/h
c) 2,310 BTU/h
d) 478 BTU/h
9.
One nondestructive way to find out if a wall is insulated is to
a) Look around the sides and/or behind an electrical outlet on an exterior wall
b) Use an electronic insulation depth detector.
c) Take off a sheet of sheeting inside.
d) Cut a large hole through the wall inside the structure.
10.
Calculate the total BTU loss for all ceilings from the provided drawing constructed with the following specifications. Total R value = 19 Outdoor winter design temperature 18 degrees F. Indoor winter design temperature 68 degrees F. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 4,622 BTU
b) 3,465 BTU
c) 4,834 BTU
d) 97 BTU per Sq. Ft.
11.
Reflective foil insulation will conduct to the next solid Layer and have an equivalent R-value of zero unless there
a) Duct tape on all seams.
b) Non-conductive painted Iayers.
c) An air gaps between the foil Iayers
d) Aluminum tape on all seams.
12.
Which of the following is an example of a thermal break?
a) A metal frame around a door or window acting to retard heat flow.
b) A wooden material added to the window to enhance beauty and use.
c) A lever operated vent that can be added to the windows and doors.
d) Non-conducting frame around a door or window acting to retard heat flow
13.
The ability of a window to absorb certain types of energy and radiate that energy through itself and out of a room is called
a) Sensitivity.
b) Emissivity
c) Instability.
d) Reflectivity.
14.
Three basic types of Insulation are
a) Gypsum, boards and batts.
b) Fiber, reflective, and foam
c) Batts, fiber and reflective.
d) Aluminum batts, fiber and wool.
15.
Gross area of the floor for the provided drawing NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) Is usually the same as the ceiling
b) Can not be calculated from the floor plan
c) Matches the ceiling minus the Hallway.
d) Is usually ¼ larger than the area of the ceiling.
16.
To calculate the rate of heat loss, what three factors must be known?
a) The combined U-value of the construction plane, the temperature difference from one side to other side of the construction and the area of unexposed surface.
b) The area of unexposed surface of the plane the R-value of the construction plane, and the temperature difference from one side to top side of the construction plane.
c) The area of exposed surface of the plane, the T-value of the construction plane, and the temperature difference from one side to other side of the construction plane.
d) The total area of exposed surface of the plane, the U-value for the construction plane, and the temperature difference from one side to other side of the construction plane
17.
When sizing an air conditioner. what critical information must be known?
a) Previous cooling bills from utilities and make comparisons.
b) Rule of thumb calculation methods and the contractors’ reputation.
c) Amount of air flow needed to heat the house normally in winter.
d) Calculated sensible and Iatent Ioads
18.
What is the effect of an oversized heating and cooling system?
a) The structure will develop low humidity levels in the cooling season and high humidity in the winter.
b) Equipment will last longer and require less energy to operate due to the shorter run time.
c) Operating cost and relative humidity in the structure will decrease significantly.
d) Moisture damage to a furnace heat exchanger and inadequate humidity removal during cooling cycles
19.
A window designed for sloped or horizontal installation in the roof of a residential building to provide day-lighting and/or ventilation and may be fixed or operable are called.
a) Air venting window.
b) Roof vent window.
c) Skylight window
d) Sash window.
20.
A basement interior is considered conditioned space if
a) The space is not humidified by a electronic humidifier/fan.
b) A maximum of 50°F is maintained over the heating season.
c) The temperature is not significant in calculation itself.
d) A minimum of 50°F is maintained over the heating season
21.
The blueprint scale is 1/8” = 1’ and the measurement is ½”, what is the actual length.
a) 12”
b) 2’
c) 4’
d) 1/2’
22.
Find the total glass area of the North side of the provided house drawing? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 18
b) 5
c) 36
d) 12
23.
Transmission heat loss is
a) Heat transferred through confining walls. glass, ceilings, floors or other surfaces
b) Around doors and windows and porous building materials.
c) Heat transferred through cracks and crevices.
d) Heat lost through materials made of glass only.
24.
When the outside temperature or wind speed changes
a) The design temperature must be recalculated for the location.
b) Chill factor is used in finding the heat gains.
c) The rate of heat loss or gain changes
d) Relative humidity must be considered.
25.
The construction features needed to calculate basement heat loss are
a) Above-grade wall, below-grade wall, and basement floor
b) Adjacent garages, basement walls (interior only) and doors.
c) Basement interior walls above grade, the basement floor and windows.
d) Basement windows, doors, and bathroom if present.
26.
The design cooling load is an estimate of the rate at which a building gains heat is
a) Based on the design outdoor temperature
b) Based on the maximum outdoor temperatures.
c) Based on external factors only.
d) Based on the minimum outdoor season temperature.
27.
The amount of building air leakage at specific pressures, or an equivalent leakage area can be found with which of the following?
a) An air pump pressure.
b) Duct leakage tester.
c) Blower-door tester
d) A Vacuum pump gauge.
28.
Radiant heat travels from a source
a) Travels by electromagnetic waves from the source
b) Travels in a 90-degree angle from the source.
c) Only in one direction parallel to the source.
d) To only one molecule at a time from the source to the place being warmed.
29.
When installing zones for heating and cooling
a) Only one thermostat controls the heating system.
b) An automatic change-over thermostat must be used
c) Separate thermostats are needed for heating and cooling systems.
d) Each zone should have its own thermostat or sensor
30.
Using a blue print with a scale of ¼” = 1’ and you measure 8 ¾” for an exterior wall with a ruler. What is the actual length of the wall?
a) 32 ft.
b) 8 and ¾ ft.
c) 12 ft.
d) 35 ft
31.
If the floor plan indicated two bedrooms, how many people would be used in the calculations of heat gain? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 2
b) 1
c) 4
d) 3
32.
Thermal conductivity is defined as
a) Heat transfer through a specific mass of material over a given time
b) The quantifiable heat transfer rate of a metal.
c) The movement of electrons through 1 square foot by inch thick material.
d) The temperature at which material will most efficiently conduct heat.
33.
Which of the following best describes R-value?
a) The rating of thermal resistance for a material. The higher the rating number the slower heat passes through it when the temperature difference is maintained across it
b) It is the U value times the temperature difference of the thermal conductivity.
c) The amount of conduction and convection available to be transferred in a normal setting.
d) Heat transfer coefficient of a material and its ability to keep out all conduction and radiation.
34.
What are some wind pathways for air penetration during heating season?
a) Through connections at a Foundation/wall, Floor/wall, Wall/window, Wall/roof and through materials such as concrete blocks and mortar joints.
b) Through connections at a foundation/wall, floor/wall, wall/window, wall/roof and through materials such as concrete blocks and mortar joints
c) Through items inside a foundation/wall, floor/wall, wall/window.
d) Through items in a solid foundation/wall, floor/wall, wall/window, wall/roof and through holes purposely left exposed in the concrete blocks and mortar joints.
35.
Excluding infiltration, duct loss, people, and appliances. Calculate the BTU sensible heat gain for the entire house using the following construction specifications and the dimensions from the provided drawing. Wall insulation R-13 and R2.5 Poly Board (U factor .08) Ceiling R-19 Dark Roof (U Factor .104) Floor insulation R-30 2x6 joist Over Open Crawl Space (U Factor .028) Window South (U Factor 1.6) Window East and West (U Factor2.96) Window North U Factor (1) Outdoor Summer design temperature 95 degrees F. Indoor Summer Design Temperature 72 degrees F NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 33,943 BTU
b) 18,943 BTU
c) 24,000 BTU
d) 15,943 BTU
36.
The term Building Assembly is
a) Interior walls, floors, and ceilings sections of the building that is included in the calculations of the load with the exception of doors
b) Part of building losses and heat gain loads that are not considered when calculating total loads.
c) Any part of the building enclosure that has thermal boundary conditions at the interior and exterior of the building.
d) Building knee and partition walls assembled or constructed off site.
37.
Radiant heat
a) Is not a very good source for heating due to its nature and safety.
b) Has very short paths for travel available and is only found in heaters.
c) Travels slowly in curved formations from its source, the sun.
d) Travels outward from its source in straight lines at the speed of light
38.
What are three types of batt Insulation?
a) Linen, silk, and cotton.
b) Fiberglass. cotton and rock wool
c) Metal, duct board, and sheet fiberboard.
d) Heavy plaster, fiberboard, and metal.
39.
For heating, heat gain from the sun and internal sources within the building are
a) Added into the calculations because it is a large volume of energy and extremely valuable in reducing the total heating load.
b) Neglected when doing heating load calculations because they are not dependable heat sources.
c) Added into the calculations simply because it is a valuable resource for heating.
d) Calculated into the total energy available for heating purposes
40.
A Satisfactory ventilation system will provide supply air with these characteristics
a) Minimal impurities or pollutants, comfortable temperatures, low flow rate and reduced noise
b) Fast rates of air flow, comfortable temperatures and impurities.
c) Impurities and pollutants, comfortable temperatures, low flow rate and reduced noise.
d) Fast rates of air flow, hotter temperatures, and impurities.
41.
When performing a load calculation, which building walls are most affected by solar gain in the northern hemisphere?
a) North and South.
b) North, East, and West.
c) South, East, and West
d) East and West.
42.
Convection heat transfer occurs when
a) A fan circulates air within a conditioned space.
b) Radiant beams strike the surface and release heat.
c) Magnetic fields in the air collide and the surface heats.
d) Fluids at different temperatures flow within a given space
43.
An area of an external wall which allows light to pass through is referred to as
a) Deprecation
b) Penetration
c) Indication
d) Fenestration
44.
When the inside and outside temperature of a structure are equal, there is
a) lower rate of relative humidity.
b) No heat transfer
c) Latent heat transfer to the outside.
d) Thermal heat transfer of sensible heat.
45.
Calculate the total BTU heat gain for the ceiling of room 4 using the following construction specifications and the dimensions from the provided drawing. Vented Attic Dark Roof Outdoor Summer Design temperature 95 degrees F. Indoor winter design Temperature 72 Degres F. HTM = 2.60 NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 669 BTU
b) 915 BTU
c) 352 BTU
d) 21,050 BTU
46.
Which of the following is considered an infiltration load?
a) Heat loss through non-porous building materials.
b) Heat from appliances.
c) The number of occupants.
d) Outdoor air leaking in
47.
What is the total square feet of gross windows used for calculating heat loss of the provided house drawing? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 240 Sq. Ft.
b) 159 Sq. Ft.
c) 179 Sq. Ft
d) 198 Sq. Ft.
48.
The blueprint scale is 3/16” = 1’, and the measurement is 1 3/8”, what is the actual length?
a) 22’
b) 7’4”
c) 66’
d) 29’ 4”
49.
The inverse of “U” value is
a) R value
b) R=X factor
c) T factor
d) K factor
50.
One ton of cooling is equal to how many BTU/h?
a) 5,280 BTU/h.
b) 10,000 BTU/h
c) 2,000 BTU/h
d) 12,000 BTU/h
51.
What is the total area of windows located on the south side of the house in the provided drawing? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 10 Sq. Ft.
b) 60 Sq. Ft
c) 22 Sq. Ft.
d) 36 Sq. Ft.
52.
Supply ducts can be sized by knowing
a) The largest size duct used for the smallest room.
b) BTU, room area, and fan velocity.
c) Static pressure, velocity, and CFM for individual rooms
d) The length of 8” flex duct to main rooms.
53.
The effectiveness of an envelope's ability to perform as expected depends on the
a) Quality of workmanship and materials used
b) Location of the doors and windows in the unconditioned space.
c) Temperature of the crawlspace.
d) Height of the ceilings.
54.
Find the total glass area on the East and West side of the provided house drawing? Note1: The wall height for all rooms is 9 feet. Note 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. Note 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 22 Sq. ft.
b) 372 Sq. ft.
c) 63 Sq. ft.
d) 172 Sq. ft
55.
When selecting equipment cooling capacity for a load preformed with an 80-degree outdoor design temperature, what must be done to the equipment rating.
a) The equipment would need to be de-rated
b) The equipment’s sensible capacity would need to be reduced to 15%.
c) The equipment’s latent capacity would need to be doubled.
d) The equipment rating would need to be increased.
56.
Calculate BTU loss for windows on the south side based on solar and transmission with a HTM of 52. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 3120 BTU
b) 1560 BTU
c) 115 BTU Per SqIn
d) More Information is Needed
57.
A Simple thermostat controlling the air conditioners functions senses
a) Superheat.
b) Sensible heat
c) Radiant heat.
d) Sub-cooling.
58.
Calculate the total BTU heat loss of all windows for the provided drawing, Windows are wood frame double pane, clear glass, with no external shading, Winter Design temperature outdoor 18 degrees F. Winter design Temperature Indoor 68 degrees F. Window U-value: 0.99 BTU/h per Sq. Ft. degree F. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 1000 BTU per window
b) 7871 Total BTU
c) 8550 BTU's per window
d) 1574 BTU
59.
Hot and cold spots are caused by
a) Not enough convection in the structure and not enough vents for the entire building.
b) Consistencies in construction, materials, thermal bridges and breaks, settling of materials, and quality of workmanship.
c) Inconsistencies in construction, materials. thermal bridges and breaks, settling of sealed materials, and quality of workmanship
d) Wrong materials used in the construction, breaks in the structure. And Short cuts to save money and materials.
60.
During the process of calculating the heating loads of a building you must first
a) Choose the heating unit needed by the building square footage.
b) Include fireplaces as an optional heating source.
c) Calculate the total costs of heating fuel.
d) Identify the heating zones within the building
61.
What is the total area of exterior doors, used for calculating heat gain and/or loss for the provided drawing? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 17 Sq. Ft.
b) 18 Sq. Ft.
c) 20 Sq. Ft.
d) 38 Sq. Ft
62.
The terms awning, bay, and bow casement refer to
a) Types of doors.
b) Types of sky lights.
c) Fixtures used in most houses.
d) Types of windows
63.
Which of the following has the lowest R Value
a) Blown fiberglass (U = 0.091)
b) Closed cell foam (U = 0.04)
c) Fiberglass Batts (U = 0.053)
d) Drywall (U = 20)
64.
Estimating the rate of infiltration air is difficult, because it depends on the
a) The direction the structure faces and age of people in the building.
b) Quality of construction, age of the structure, direction and strength of the wind
c) Quality of the materials and age of the structure only.
d) Costs at the time of the construction and the designer’s original purpose.
65.
What are heat infiltration losses?
a) Infiltration is the result of radiant heat which causes expansion and indirectly causes cold air to leak into the structure.
b) Uncontrolled outdoor air leaking into the occupied space from cracks and crevices through the building envelope during cooling operation
c) Heat infiltration is the loss resulting from a faulty fan and ventilation through the ductwork in a structure during the heating season.
d) Uncontrolled indoor air leaking out of the occupied space from cracks and crevices through the building envelope during cooling operation.
66.
Elevation changes greater than a few hundred feet can
a) Significantly change the design conditions
b) Cause no significant change in design conditions.
c) Decrease the heating load in some instances.
d) Usually cause a decrease in cooling and heating loads.
67.
An oversized air conditioner runs only long enough to satisfy the temperature and may not adequately address
a) Air cleaning and filtering issues.
b) Cooling issues.
c) Air distribution issues.
d) Humidity issues
68.
Temperature difference between the inside and outside of a structure and ''R" value are
a) Considered important to structure overall "U'' factor
b) Considered factors affecting heat gain only.
c) Are always considered for cooling calculations only.
d) Factors effecting heat Ioss and gain calculations
69.
Calculate the total BTU loss for all hardwood floors from the provided drawing with the following specifications. Total R value = 30 Over Open Craw Space Outdoor winter design temperature 18 degrees F. Indoor winter design Temperature 68 degrees F. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) Same as the Ceiling
b) 3,010 BTU
c) 2,878 BTU
d) 27,086 BTU
70.
As a building’s sensible cooling loads go down, the run time of the air conditioner becomes shorter. short-cycling air conditioner runs only long enough to satisfy the thermostat, and may not adequately address
a) Humidity control
b) Energy efficiency.
c) Temperature control.
d) Refrigerant pressures.
71.
Forced "Mechanical" convection occurs when
a) Radiant heat strikes the surface of a metal object.
b) fans are static during equipment off-cycle.
c) fluid changes to a vapor at room ambient temperature.
d) ceiling fan pushes warmer air down to the living area
72.
The National Fenestration Rating Council (NFRC) energy performance label can help you determine how well a product will
a) Control the energy cost by listing specific heating units for cooling and heating.
b) Reduce the building heat loss in the summer, reduce the building solar heat gain in the winter, keep out wind, and resist condensation.
c) Reduce the amount of electrical energy used by the heating and air conditioning systems.
d) Reduce the building heat gain in the summer, reduce the building heat loss in the winter, keep out wind, and resist condensation
73.
Calculate the total BTU loss for all exterior walls constructed using the following specifications and the dimensions from the provided drawing Walls (insulation R-11, ½ inch poly board R-2.5, 2x4 wood frame, with Brick exterior finish) Total R value equal 15.5 Winter outdoor design temperature = 18 degrees F. Winter indoor design temperature =68 degrees F. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 5,198 BTU
b) 878 BTU
c) 4391 BTU
d) 8,450 BTU
74.
A resident with a heat loss of 60,000 BTU at a 30 degree outdoor design condition, would have a ___________BTU heat loss at 20 degrees.
a) 60,000 BTU
b) 120,000 BTU
c) 90,000 BTU
d) 80,000 BTU
75.
What is the total area of net ceiling for the provided drawing? NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 60,000 BTU
b) 120,000 BTU
c) 90,000 BTU
d) 80,000 BTU
76.
Moisture control within the wall cavity is very important because damp insulation has
a) Reduced insulating value
b) Been used to increase the insulating value.
c) No insulating value at all.
d) Excellent insulating value.
77.
The Set Point (inside temperature) = 70 degrees F, and outside temperature = 60 degrees F. If the outside temperature changes to 50 degrees F. What happens to the rate of heat transfer?
a) The temperature difference doubles so the rate of heat transfer doubles
b) The temperature difference will cause the rate of heat transfer to be one half.
c) The rate of heat transfer will be almost four times as much as calculated.
d) There will be no significant difference in the rate of heat transfer in this problem.
78.
The R-value for building materials used in residential construction increases directly proportionate to the
a) Length of the material.
b) Thickness of the material
c) Longevity of the material.
d) Temperature difference of the material.
79.
Low Emittance (E) Glass is
a) Glass which has low emissivity due to a film or metallic coating on the glass
b) Glass which has high emissivity due to a film or metallic coating on the glass.
c) Glass which has energy reflective panels with metallic coating glued to the outside.
d) Glass suspended between the inside and outside panes to restrict the passage of radiant heat.
80.
The outside surface of a building has a strong affect on how much solar energy gets absorbed or reflected. Which of the following has the greatest affect?
a) Type of material and wind
b) Direction and Material
c) Color and Texture.
d) Wind and color.
81.
Local geography and microclimatic conditions often result in significant differences between
a) The relative humidity and the moisture ratio.
b) Any given site and the nearest reported weather station
c) Relative humidity and the wet bulb reports.
d) Chill factors and humidity contents.
82.
What is the total area of gross exposed walls of the provided house drawing if the ceiling height is 9’? NOTE 1: The wall height for all rooms is 9’. Note 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimals places. NOTE 3 For each window, door or surface area, round off square feet to the nearest whole number.
a) 1497 Sq. Ft.
b) 172 Sq. Ft.
c) 1376 Sq. Ft.
d) 1548 Sq. Ft
83.
Negative pressures in the lower levels of a structure and positive pressure in the upper levels are caused by
a) Cold air rising and hot air dropping.
b) The ambient temperature is adjusted too high.
c) Stack effect from building height
d) The air conditioning equipment malfunctioning.
84.
Doubling the thickness of a material while maintaining the temperature difference, the rate of heat transfer through the material will be
a) Not changed.
b) Doubled.
c) One half
d) Tripled.
85.
Typical values of air change rates range from
a) 0.5 for new construction to 1.0 air changes per hour for leaky, older buildings
b) 2 for new construction and 2.0 air changes per hour in leaky old buildings.
c) 1 air change for all buildings is the recommended amount.
d) 2 for new construction to 3 air changes per hour for leaky, older buildings.
86.
The normal sequence to calculate the cumulative conductivity for a cross section of building materials.
a) Look up the R-value for each material in the building cross section, add these values, and then take the reciprocal of that answer to get the U-factor
b) Look up the U-value for each material in the building cross-section, add these values, and then take the reciprocal of that answer to get the U-factor.
c) Look up the X-value for each material in the building cross-section, add these values, and then take the reciprocal of that answer to get the U-factor.
d) Look up the T-value for each material in the building cross-section, add these values, and then take the reciprocal of that answer to get the U-factor.
87.
To control comfort level, and efficiency it is necessary to control the rate of ventilation air
a) By a forced fan venting system in the structure during summer.
b) Based on the maximum number of windows and interior doors in the structure.
c) Based on the number of occupants, size of the building and infiltration rate
d) Based on the maximum number of occupants that can be inside the structure at any given time.
88.
When calculating the heating load for a zone, which of the following should be used?
a) Determine the type of unit and ductwork that will facilitate the needs of the heating unit.
b) Identify the exposed surfaces by directions, type, and net area of each surface
c) Calculate the duct size for heating then cooling using a duct slide rule.
d) Check the BTU/h input of the heating system.
89.
Spray Foam insulation can be effectively used for sealing
a) The heating vent through the roof. to prevent hot air from escaping.
b) The air handler service door so that it will never come off again.
c) The foundation vents around the building envelope.
d) Open cavities around ducts, pipes, and electrical wiring that pass through the building envelope
90.
Ventilation air should be
a) Provided to conditioned rooms through mechanical and/or natural air distribution
b) Restricted based on the number of building occupants.
c) Cannot be provided by means of mechanical devices for residences.
d) Added to every room and structure by using mechanical devices only.
91.
Approximately how much heat does the human body produce when resting?
a) 500 to 900 BTU
b) 900 to 1200 BTU.
c) 100 to 300 BTU.
d) 300 to 500 BTU.
92.
Calculate the total BTU heat gain for the total walls constructed from the provided drawing using the following specifications. Walls (Insulation R-13, ½ inch poly board R-2.5, 2x4 wood frame, Brick exterior finish) (U Factor .087) Summer design temperature outdoor 95 degrees F. Summer design temperature indoor 72 degrees F. NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 2,703 BTU
b) 20,941 BTU
c) 2,041 BTU
d) 4,301 BTU
93.
Heat moves at a rate relative to
a) The pressure difference that exists between hot and cold materials.
b) Parts per million of saturated heated air volume.
c) The amount of moisture in the air.
d) The temperature difference between hot and cold
94.
Windows featuring a hinged sash that uses a crank to swing out left or right are called
a) Replacement
b) Basement.
c) Double-Hung.
d) Casement
95.
What is the shorthand term for the difference between two temperatures?
a) Zelda T
b) Alpha Z
c) Delta T
d) Delta P
96.
The total CFM required for an air conditioning system is determined by the
a) Total of sensible and latent load
b) Sensible heat load.
c) Latent heat load.
d) Infiltration and ventilation load.
97.
Calculate the total BTU heat gain for room 1 using the following construction specifications and the dimensions from the provided drawing. Wall insulation R-13 and R2.5 Poly Board (U factor .087) Ceiling R-19 Dark Roof (U Factor .104) Floor insulation R-30 2x6 joist Over Open Crawl Space (U Factor .028) Window South (U Factor .68) Outdoor Summer design temperature 95 degrees F. Indoor Summer Design Temperature 72 degrees F NOTE 1: The wall height for all rooms is 9’. NOTE 2: When calculating heat gain and loss for the provided drawing, Round U factor to 3 decimals places, Round heating transfer multiplier (HTM) to two decimal places. NOTE 3: For each window, door or surface area, round off square feet to the nearest whole number.
a) 5,803 BTU
b) 5,380 BTU
c) 7,810 BTU
d) 3,905 BTU
98.
Outer elements of a building, such as wails, windows, doors, roofs, and floors, including those having contact with earth is the ASHRAE definition of what?
a) Structure.
b) Building Envelope
c) Residence office.
d) Structure thermal element.
99.
What are heat transmission losses?
a) Heat transferred through walls, glass, ceiling, floor or other surfaces
b) Heat that is collected for later use in the structure or residence.
c) Heat gained indoors from the solar collection materials.
d) Heat retained in insulations and non-conducting materials for later transfer purpose.
100.
What will a non-uniform distribution from settling insulation in an attic cause?
a) Reduction in insulating value and effectiveness
b) The insulating value and density will increase.
c) The insulating value will stay the same and the density will increase.
d) The attic will have hot spots in the insulation
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