Arch-333 Test #2

The total amount of energy that is transmitted through glazing is a combination of which two energy flows? Conduction and solar Convection and solar Sensible and latent Radiation and solar Conduction and enthalpy

Conduction and solar

Heat Load

"The amount of heat that must be supplied by the HVAC system to keep the room at the design temperature"

A material is consider "vapor impermeable" at what perm level? .1 perm or less greater than .1 perm but less than 1.0 perm greater than 1.0 perm but less than 10 perms greater than 10 perms Permeability is not rated by perms

.1 perm or less

Typical double-glazed windows conduct heat at what rate above that of a well insulated wall? 5 to 10 times 10 to 20 times 25 to 50 times 50 to 75 times

25 to 50 times

Glass with a shading coefficient (SC) of .75 allows how much solar heat into the space, compared to clear, single-strength glass? 75% more heat 75% less heat 25% more heat 25% less heat Does not apply to heat gain

25% less heat

The solar heat gain through a clear, single pane window installed on the East side of a building is apt to be highest at what time of day? 9:00 A.M. 12:00 Noon 3:00 P.M. 6:00 P.M. Equal at all times

9:00 A.M.

Vapor Barrier

A Class I vapor retarder

Rate of Conduction Heat Transfer

A function of three variables Thermal conductivity Area Temperature differential Q = 1/RT x Area x (T2 - T1) = BTU/HR

Thermal Break

A thermal "break" disconnects the bridge

Thermal Bridge

A thermal "bridge" is a pathway of reduced resistance in an assembly Thermal bridges significantly reduce the Resistance of the wall assembly

The Overall Heat Transfer Coefficient

A. Represents the ability of a complete structure or construction to conduct (or transfer) heat B. Can be calculated by adding all resistances C. Resistances (R) are additive, Heat Transfer Coefficients (U) are not!

The foremost authority on heating, refrigerating and air-conditioning data, and the source of the tables and charts, is known by what acronym? TETD SHGF SC CFM ASHRAE

ASHRAE

Air Barrier

Air barriers are systems of materials designed and constructed to control airflow between conditioned and unconditioned spaces An air barrier is not necessarily a vapor barrier (i.e., they can be permeable) The concern about airflow stems from its ability to carry water vapor

A simple method of estimating the amount of infiltration into a building based upon the volume of the building is referred to by what name? Crack method Volume method Whole building method Air change method Fenestration method

Air change method

Airflow with moisture adversely impacts which of following long-term performance parameters of a material? Thermal energy use Building behavior in a fire Structural integrity All of the above Both 'A' and 'C'

All of the above

The Total Equivelent Temperature Differential (TETD) is a function of which of the following variables? Orientation Time of day Absorption property Thermal mass All of the above

All of the above

Which of the following is method of providing a drained opening? Pan flashings Membranes lining openings Building papers Formable flashings All of the above

All of the above

What term describes the transmission of heat through direct physical contact, without appreciable displacement of the particles of the body? Latent heat of fusion Latent heat of vaporazation Convection Radiation Conduction

Conduction

What factor describes a material's susceptibility, or ability, to conduct heat flow? Temperature Differential (Delta T) R Factor U Factor Q Factor CFM

U Factor

The element that is designed and installed in an assembly to retard the movement of water by vapor diffusion is referred to by what term? Vapor barrier Air barrier Vapor retarder Vapor permeable VApor semi-permeable

Vapor retarder

Envelope Losses consist of all of the following except Wall Roof Floor Windows Doors Infiltration Ventilation

Ventilation

Which of the following activities releases the most latent heat into the space? Sedentary work Standing Walking at 3 MPH Moderate dancing Light bench work

Walking at 3 MPH

Placing Vapor Retarder Guidelines

Locate only on the warm side of the wall (except basement) for cold climates Avoid vapor barriers where vapor retarders will work Avoid vapor retarders on both sides of assemblies like the plague Avoid vinyl wall coverings on the inside of air-conditioned assemblies Avoid polyethylene vapor barriers, foil faced batt insulation and reflective radiant barrier insulation on the interior of air-conditioned assemblies

The outside temperature criteria used to calculate heating and cooling loads is a function of what variable(s)? Mean of extreme outside temperature Mean of extreme outside temperature and function of building Mean of extreme outside Humidity Ratios and function of building Mean of inside temperature and extreme outside temperature Mean of inside temperature, extreme outside temperature and function of building.

Mean of extreme outside temperature and function of building

LEED v4 EA Prerequisite 2

Minimum energy Performance as found in ASHRAE 90.1 - 2010 Demonstrate a 5% improvement in new buildings or a 3% improvement in existing buildings compared with the baseline building performance rating

Can you add U-Values?

NO

Air conditioning heat rejection equipment, such air-cooled condensers, cooling towers, etc. whould be installed in which location? Indoors Outdoors Underground In an enclosed structure

Outdoors

Strategies For efficiency (in order)

Reduce the load -Owner operation -Building orientation -Envelope Select the right HVAC system Look for synergies

Thermal Resistance

Refers to its ability to resist the flow of heat through a homogeneous substance.

The percent reduction in solar heat gain through a clear, single pane window is denoted by what term? TETD SHGF SC CFM ASHRAE

SC

The solar heat that enters through a clear, single pane window is denoted by what term? TETD SHGF SC CFM ASHRAE

SHGF

he solar gain through a piece of glass on an outside wall is a function of which of the following variables? Shading Coefficient Total Equivalent Temperature Differential (TETD) 'U' value - heat transfer coefficient 'R' value - resistance All of the above

Shading Coefficient

In estimating cooling loads, it is no longer possible to use a simple temperature differential as it does not acount for which of the following conditions? Resistance Solar effects Moisture migration Stack effects Conductance

Solar effects

Thermal Conductance

The ability of a non-homogenous material to conduct (or transfer) heat.

Vapor Retarder

The element that is designed and installed in an assembly to retard the movement of water by vapor Class I - .10 perm or less Class II - .10 perm to 1.0 perm Class III - 1.0 perm to 10.0 perm

Temperature Gradients

The temperature differential between two separate surfaces as heat transmits across them.

An advantage of exterior air barrier systems is that they control wind-washing. True False

True

Brick veneers should be back ventilated to uncouple the the reservoir from the rest of the wall assembly. True False

True

Controlling rain is the single most important factor in the design and construction of durable buildings and in the control of mold. True False

True

For assemblies of non-uniform construction, such as stud walls with insulation between the framing, the 'U' factor can be safely calculated by averaging the areas of each different construction. True False

True

Humans contribute both sensible and latent loads to a space. True False

True

In winter, infiltration is typically higher. True False

True

The Shading Coefficient (SC) is a property of the glazing material. True False

True

The cooling load in the occupied space is less if the design includes a return air plenum. True False

True

The function of a vapor barrier is to retard the migration of water vapor. True False

True

The fundamental principle of water control in the vapor form is to keep it out and to let it out if it gets in. True False

True

The heating loads are estimated first, then the system is designed, then constructed. True False

True

The higher the resistance of the material, the lower the heat transfer rate through the material. True False

True

The significant disadvantage of exterior air barrier systems is their inability to control the entry of air-transported moisture into insulated cavities from the interior. True False

True

Wind velocity does not enter into the calculations for heating loads; nonetheless, it is important for judging the severity of infiltration. True False

True

Which of the following is not considered a heat gain into the occupied space? Lights People Equipment loads Infiltration through doors and windows Conduction through basement floor

Conduction through basement floor

The conduction of heat through a substance is a function of what three variables? WB temperature, area and resistance WB temperature, volume and resistance DB temperature, volume and resistance DB temperature, area and resistance DB temperature, area and specific heat

DB temperature, area and resistance

Drainage Planes

Drainage planes are spaces used in the design and construction of buildings to control rain/condensation

The best way to overcome thermal bridges created by balconies is to do which of the following? Independently support the balconies Use only exterior insulation on the wall Use stainless steel reinforcing bars through a foam block Eliminate the balcony

Eliminate the balcony

LEED EQ Credit 5

Environmental Quality (EQ) "Ventilation" Credit 5 - Design to minimize pollution cross-contamination of regularly occupied spaces Vestibule design Housekeeping and copy centers in a negative space Separate drains for chemicals

A design Dry Bulb (DB) of 99% for heating is less stringent than a deisgn DB of 97.5%. True False

False

Heating and cooling load calculations are entirely accurate if the proper process is used. True False

False

Heating loads represent how much heat is gained by the structure and must be removed by the HVAC system. True False

False

In estimating cooling loads, a simple temperature difference between inside and outside air will account for the solar heat load. True False

False

The insulating value of a total assembly is the sum of the 'U' values for each component of that assembly. True False

False

The latent heat gain into a space due to infiltration or ventilation is a function of the flow and the temperature differential. True False

False

The resistance of an air space within a cavity wall can be safely ignored as it is nearly negligible. True Correct Answer The resistance of an air space within a cavity wall can be safely ignored as it is nearly negligible. True False

False

Vapor barriers are typically intended to retard the migration of air. True False

False

When determining ventilation requirements, it is acceptable to take a credit for the amount of infiltration anticipated. True False

False

Typically, which of the following systems requires the most space within a building?

HVAC

Water Vapor Rule

Water vapor moves from the warm side of building assemblies to the cold side

Drainage planes should be integrated into which of the following elements of the building envelope? Windows and doors Window and door openings Foundation Roof soffits All of the above

Window and door openings

Can you add R values?

YES

Under the Department of Energy's proposed climatic zone map, Nebraska fall under which climate zone? Zone 3 Zone 4 Zone 5 Zone 6 1/2 Zone 6 and 1/2 Zone 5

Zone 5