Residential Heat Load Analyst ESCO

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

Moisture damage to a furnace heat exchanger and inadequate humidity removal during cooling cycles

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

No heat transfer

Heat moves at a rate relative to;

the temperature difference between hot to cold

Radiant heat travels from a source;

by electromagnetic waves from the source

Doubling the thickness of an insulating material while maintaining temperature difference, the rate of heat transfer will be;

One half

Thermal conductivity is defined as;

Heat transfer through a specific mass of material over a given time

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

South, East and West

Convection heat transfer occurs when;

Fluids at different temperatures flow within a given space

Forced convection occurs when;

A ceiling fan pushes warmer air down to the living area

Radiant heat;

Travels outward from its source in straight lines at the speed of light (186,000 mi/s)

What are heat transmission losses?

Heat transferred through walls, glass, ceiling, floor or other surfaces

Approximately how much sensible heat and latent does the human body produce when resting?

300-500 BTU

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

fenestration

As a building’s sensible cooling loads go down, the run time of the air conditioner becomes shorter. A short-cycling air conditioner runs only long enough to satisfy the thermostat and may not adequately address;

Humidity control

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

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

What are heat infiltration losses?

Uncontrolled outdoor air leaking into the occupied space from cracks and crevices through the building envelope during the cooling operation

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

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

The inverse of “U” value is;

R value

The term Building Envelope is;

Any part of the building enclosure that has thermal boundary conditions between the interior and exterior of the building

Which of the following best describes R-value?

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

Which of the following has the lowest R value?

Drywall (U = 20)

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

Thickness of the material

Three basic types of insulation are;

Fiber, reflective and foam

Reflective foil insulation will conduct to the next solid layer and have an equivalent R-value of zero unless there is;

an air gap between the foil layers

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

Reduced insulating value

Temperature difference between the inside and outside of a structure and “R” value are;

factors effecting heat loss and gain calculations

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

Calculated sensible and latent loads

Outer elements of a building, such as walls, windows, doors, roofs, and floors, including those having contact with earth is the ASHRAE definition of;

Building envelope

Hot and cold spots are caused by;

Inconsistencies in construction, materials, thermal bridges (highly conductive material ex: metal frame), breaks (missed insulation), settling of materials, and quality of workmanship

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

The heat gain/loss summary

During the process of calculating the heating loads of a building, you must first;

Identify the heating zones within the building

Transmission Heat Loss is;

Heat transferred through confining walls, glass, ceiling, floor, or other surfaces

A basement interior is considered conditioned space if;

A minimum of 50 degrees F is maintained over heating season

Spray foam insulation can be effectively used for sealing;

Open cavities around ducts, pipes, and electrical wiring that pass through the building envelope

What are 3 types of batt insulation?

Fiberglass, cotton, and rock wool

The effectiveness of an envelope’s ability to perform as expected depends on the;

Quality of workmanship and materials used

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

Neglected when doing heating load calculations because they are not dependable heat sources

Which of the following is considered an Infiltration load?

Outdoor air leaking in (requires extra energy to condition)

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

A non-conducting frame around a door or window acting to retard heat flow

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

reduction in insulating value and effectiveness

One nondestructive way to check a wall for insulation is to;

Look around the sides and/or behind an electrical outlet on an exterior wall

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

Reduce the building heat gain in the summer, reduce the building heat loss in the winter, keep out wind, and resist condensation

Low Emittance (E) Glass is;

Glass which has low emissivity (ability to radiate thermal energy) due to a film or metallic coating on the glass

The construction features needed to calculate basement heat loss are;

Above-grade wall, below-grade wall, and basement floor

The terms awning, bay, and bow casement refer to;

types of windows

When the outside temperature or wind speed changes;

The rate of heat loss or gain changes

Local geography and microclimatic conditions often result in significant differences between;

Any given site and the nearest reported weather station

Elevation changes greater than a few hundred feet can;