Residential Heat Load Calculations


1. The purpose of a home air conditioner is to move heat from inside the home to the outside by




2. What document gives the designer an opportunity to see if any of the calculated values are out of Iine?




3. What is blower door test equipment used for?




4. When calculating thermal loss or gain




5. What is the perimeter in feet of exposed wall for the entire house provided?






6. Glass with a textured surface which provides low visibility and allows in natural light is called




7. Ventilation is important to the home owner because




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.






9. One nondestructive way to find out if a wall is insulated is to




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.






11. Reflective foil insulation will conduct to the next solid Layer and have an equivalent R-value of zero unless there




12. Which of the following is an example of a thermal break?




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




14. Three basic types of Insulation are




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.






16. To calculate the rate of heat loss, what three factors must be known?




17. When sizing an air conditioner. what critical information must be known?




18. What is the effect of an oversized heating and cooling system?




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.




20. A basement interior is considered conditioned space if




21. The blueprint scale is 1/8” = 1’ and the measurement is ½”, what is the actual length.




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.






23. Transmission heat loss is




24. When the outside temperature or wind speed changes




25. The construction features needed to calculate basement heat loss are




26. The design cooling load is an estimate of the rate at which a building gains heat is




27. The amount of building air leakage at specific pressures, or an equivalent leakage area can be found with which of the following?




28. Radiant heat travels from a source




29. When installing zones for heating and cooling




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?




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.






32. Thermal conductivity is defined as




33. Which of the following best describes R-value?




34. What are some wind pathways for air penetration during heating season?




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.






36. The term Building Assembly is




37. Radiant heat




38. What are three types of batt Insulation?




39. For heating, heat gain from the sun and internal sources within the building are




40. A Satisfactory ventilation system will provide supply air with these characteristics




41. When performing a load calculation, which building walls are most affected by solar gain in the northern hemisphere?




42. Convection heat transfer occurs when




43. An area of an external wall which allows light to pass through is referred to as




44. When the inside and outside temperature of a structure are equal, there is




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.






46. Which of the following is considered an infiltration load?




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.






48. The blueprint scale is 3/16” = 1’, and the measurement is 1 3/8”, what is the actual length?




49. The inverse of “U” value is




50. One ton of cooling is equal to how many 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.






52. Supply ducts can be sized by knowing




53. The effectiveness of an envelope's ability to perform as expected depends on the




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.






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.




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.






57. A Simple thermostat controlling the air conditioners functions senses




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.






59. Hot and cold spots are caused by




60. During the process of calculating the heating loads of a building you must first




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.






62. The terms awning, bay, and bow casement refer to




63. Which of the following has the lowest R Value




64. Estimating the rate of infiltration air is difficult, because it depends on the




65. What are heat infiltration losses?




66. Elevation changes greater than a few hundred feet can




67. An oversized air conditioner runs only long enough to satisfy the temperature and may not adequately address




68. Temperature difference between the inside and outside of a structure and ''R" value are




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.






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




71. Forced "Mechanical" convection occurs when




72. The National Fenestration Rating Council (NFRC) energy performance label can help you determine how well a product will




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.






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.




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.






76. Moisture control within the wall cavity is very important because damp insulation has




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?




78. The R-value for building materials used in residential construction increases directly proportionate to the




79. Low Emittance (E) Glass is




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?




81. Local geography and microclimatic conditions often result in significant differences between




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.






83. Negative pressures in the lower levels of a structure and positive pressure in the upper levels are caused by




84. Doubling the thickness of a material while maintaining the temperature difference, the rate of heat transfer through the material will be




85. Typical values of air change rates range from




86. The normal sequence to calculate the cumulative conductivity for a cross section of building materials.




87. To control comfort level, and efficiency it is necessary to control the rate of ventilation air




88. When calculating the heating load for a zone, which of the following should be used?




89. Spray Foam insulation can be effectively used for sealing




90. Ventilation air should be




91. Approximately how much heat does the human body produce when resting?




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.






93. Heat moves at a rate relative to




94. Windows featuring a hinged sash that uses a crank to swing out left or right are called




95. What is the shorthand term for the difference between two temperatures?




96. The total CFM required for an air conditioning system is determined by the




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.






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?




99. What are heat transmission losses?




100. What will a non-uniform distribution from settling insulation in an attic cause?




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