Chapter 4 HW Questions - Exam 2

For Topeka, Kansas, the Extreme Annual Daily minimum DB winter temperature would be ______°F.

-8

In utilizing the ASHRAE handbook, of the 8760 total hours in a year, the outside dry bulb temperature at the specific geographical location historically fell below the 99.6% design temperature for ____ % of the time in a year.

.4%

Because of constant temperatures, soil above ____ feet in depth changes temperature much slower than does the rapidly changing air temperature.

10

In general, occupants in buildings give off _____ Btu/hr.

250

As a rule of thumb for sizing equipment, 400 to ______ square feet should be calculated per ton.

600

The typical inside design temperature range for the heating season in most U.S. homes is usually in the range of 68°F to ____ °F

72

As a rule of thumb method for sizing heating equipment, 25,000 to _________ Btu's should be figured per 1,000 square feet.

75,000

Which organizations developed the Manual J Residential load calculation and the Manual N, Commercial Load calculations?

ACCA & ARI

Which infiltration method is normally used in design of modern buildings, because all known cracks are sealed and infiltration is already reduced?

Air Change Method

What do you think is one of the best ways to reduce the amount of infiltration in the house you currently live in, or in a relatives house if you don't live in one. Be specific on your answer. You should have a minimum of a couple sentences explaining where and how to reduce.

Best way to reduce the amount of infiltration in the apartment that I live in right now would be to seal the windows/doors because the windows/doors are not sealed well. One way to better seal the doors/windows would be to weatherstrip or caulk them.

The ____________ method represents a good way to obtain estimates for annual energy consumption because it accounts for the changing outside temperature and partial load conditions.

Bin Energy Estimation

In cold climates, it is not important or necessary for insulating construction assemblies below grade due to the constant temperature of soil.

False

Moderate "rounding" in heating load calculations is not acceptable in the building design industry.

False

The primary requirement for thermal comfort of building occupants during cold weather is a comfortable inside WetBulb temperature.

False

There are three methods used to calculate heat loss from infiltration.

False

Unheated basements and crawl spaces located almost entirely below ground will normally have a temperature equal to the outside design temperature.

False

__________ is the amount of heat that a building or building space loses from heat transfer during cold weather

Heat Loss

The _________________ is the heat that the HVAC equipment must generate and introduce into the building to maintain comfortable conditions in the building interior.

Heating Load

________________ heat losses relate to air leakage through the building envelope and the energy required to heat unconditioned air that has leaked into the structure.

Infiltration

For Wichita, Ks, Which month should be planned to have the highest normal heating degree-days?

January

One foot of dry earth has an R- value equal to about ____.

One

In calculating the transmission heat loss in floors on grade, you base the calculations on the _______________ of the slab.

Perimeter

When HVAC systems are operated intermittently (e.g., night setback), the system must be capable of heating up the inside temperature, which has been allowed to coast to temperatures below comfort ranges. These additional loads are called ______________.

Pick-up Allowances

________________ heat losses are the result of heat passing through a material in the building envelope or through an assembly of materials.

Transmission

For residences, ventilation heat loss is generally ignored in heating load computations because it is typically not a code requirement and is generally a small load

True

Generally, heating load computations are made with the assumption that internal heat gains do not exist.

True

Heating load calculations are made to size an HVAC heating system and its components based on heat loss and building performance at near extreme conditions

True

If the basement has open windows or the crawl space or attic is vented, the temperature will be lower than if it does not have windows or vents.

True

Temperatures in un-ventilated spaces will vary depending on the transmission characteristics and quantity of surface area adjacent to heated rooms compared to the transmission characteristics and quantity of surface area adjacent to the exterior.

True

Wind creates a difference in pressure within the building, thereby increasing the rate of infiltration.

True

_________________ is the introduction of outdoor air into the building, or parts of the building, at a controlled rate with the intent to maintain or improve indoor air quality.

Ventilation