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What is the main purpose of heating load calculations?

  • To size a heating system based on heat loss (correct)
  • To establish the maximum cooling required by the system
  • To calculate the heat transfer through walls only
  • To determine how much heat gain to expect from the sun
  • Which factor is critical in calculating cooling loads?

  • The number of heating systems in the building
  • The outdoor weather conditions only
  • The quality of building materials used
  • Internal heat gains from people and equipment (correct)
  • What does the difference in temperature across a surface impact?

  • The energy consumption of the building
  • The size of the heating system
  • The heat transfer rate (correct)
  • The amount of insulation needed
  • Which condition typically represents the worst-case scenario for heat loss calculations?

    <p>At night with low outdoor air temperatures</p> Signup and view all the answers

    Which of the following does NOT contribute to internal heat gains in a building?

    <p>Sunlight through the windows</p> Signup and view all the answers

    Why is the heat loss calculation simpler than the heat gain calculation?

    <p>It does not consider any internal heat gains</p> Signup and view all the answers

    When conducting cooling load calculations, which component is essential?

    <p>The thermal performance of the roof</p> Signup and view all the answers

    What impacts the amount of heat generated within a space that must be considered for cooling calculations?

    <p>The presence of electrical devices and occupants</p> Signup and view all the answers

    What can be a consequence of duct leakage and heat gain or loss in residential systems?

    <p>Increased unit capacity</p> Signup and view all the answers

    What is the primary factor that leads to complex load calculations in residential buildings?

    <p>Variations in building characteristics</p> Signup and view all the answers

    Which device typically controls the space conditions during cooling unit operation?

    <p>Room thermostat</p> Signup and view all the answers

    In what way do cooling and heating load calculations differ according to the content?

    <p>Cooling requires detailed hour-by-hour analysis, but heating does not</p> Signup and view all the answers

    What effect does excessive sensible capacity in a cooling system have on performance?

    <p>Causes short-cycling</p> Signup and view all the answers

    What aspect of heat flows impacts the load profile of a residential building?

    <p>Relative magnitude and pattern of heat flows</p> Signup and view all the answers

    Which chapter provides more detailed guidance on calculating residential cooling loads?

    <p>Chapter 17 of the ASHRAE Handbook</p> Signup and view all the answers

    How should the content in the ASHRAE Handbook be viewed in relation to determining space heating and cooling loads?

    <p>As an supplementary resource alongside other fundamental materials</p> Signup and view all the answers

    What is a primary factor affecting cooling loads in residential buildings compared to commercial buildings?

    <p>Lower structural heat gains</p> Signup and view all the answers

    In the context of heating load calculations, which feature is unique to residential buildings?

    <p>Flexible use of spaces</p> Signup and view all the answers

    Why might applying commercial building load calculation methods to residences result in inaccuracies?

    <p>Residences experience unrealistically high internal heat gains</p> Signup and view all the answers

    How does the design of residential heating systems typically differ from that of commercial systems?

    <p>Residential systems are often designed for single-zone control</p> Signup and view all the answers

    Which of the following is a significant internal heat gain factor in commercial buildings that is less influential in residential structures?

    <p>Appliances</p> Signup and view all the answers

    What characteristic of internal heat gains is true for residential systems compared to commercial systems?

    <p>They contribute less to the total load</p> Signup and view all the answers

    What is one reason residential buildings experience greater distribution losses?

    <p>Use of older HVAC technology</p> Signup and view all the answers

    Which of the following statements best describes the parameters for evaluating equipment selection in building design?

    <p>Evaluating many options allows for better overall decisions</p> Signup and view all the answers

    Study Notes

    Chapter 5: Space Loads

    • Space load calculations determine required heating/cooling rates for desired indoor conditions
    • Key components of heating/cooling loads are shown in Figure 5-1
    • Calculations determine maximum heating/cooling rates needed annually
    • These calculations are foundational for HVAC system design and component selection
    • Factors affecting load calculations include external (temperature) and internal (occupancy) factors
    • Calculations affect first costs, occupant comfort, and system efficiency

    Background

    • Cooling calculations determine heat gain
    • Heating calculations determine heat loss
    • Heat transfer is the basis of calculations in either case

    Heat Transfer Factors

    • Heat transfer determined by surface area of separation, material quality, and temperature difference
    • Cooling calculation considers all heat gains (building envelope & internal sources)
    • Heating calculation simpler, considering worst case night-time conditions

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