Standards
Identify sources of heat leakage and recommend structural improvements first.
What is the first step of system design?
A form of energy that results in the motion of atoms.
What is heat?
The average difference between the daily high and low dry-bulb temperatures.
What is the daily range?
The specific temperature below which water vapor in the air begins to condense into liquid water.
What is dew point?
The physical barrier separating inside air from outside air.
What is the building envelope?
It computes the exact BTUs per hour entering and leaving residential structures to prevent oversizing and undersizing.
What is the purpose of Manual J?
A measure of heat intensity or heat level of a substance.
What is temperature?
In the US, heating systems must be capable of maintaining _____F inside when outside temperatures fall below 0F with strong winds.
What is 70 degrees fahrenheit?
Air temperature measured by a standard thermometer freely exposed to the air.
What is the dry-bulb temperature?
Making a building too tight results in insufficient air changes, trapping pollutants inside.
What is Sick Building Syndrome?
These types of systems utilize materials and processes engineered to hit five core benchmarks.
What is Sustainable HVAC systems?
Heat always naturally travels from a substance at a ___________ temperature to a __________ temperature.
Heat that is transferred through walls, ceilings, and floors.
What are conduction loads?
Measured by placing a moist wick over a thermometer bulb.
What is the wet-bulb temperature?
Used to combat Sick Building Syndrome by introducing fresh outside air into the supply plenum using HRVs and ERVs.
What is mechanical ventilation?
This manual was developed over 5 decades ago by the ACCA.
Heat added or removed to control humidity.
What are latent heat loads?
What is the summer target?
The HVAC climate zone of Beaumont, Texas.
What is zone 2A?
This rate depends on house size, envelope tightness, and fireplaces. Tightness baselines include: best, average, poor.
What is the infiltration rate?
HVAC designs use national, ________________ for residential/commercial design, installation, maintenance, and energy auditing. These benchmarks are widely adopted into U.S. building codes.
What are ANSI-approved benchmarks?
(National Standards; American National Standards Institute)
The total amount of heat transfer is determined by building's _____________, _____________, and ___________.
What is Design, Construction Materials and Location?
Manual J calculations rely on 30 year historical weather data to establish limits that occur ________ of hours in a typical year for winter heating and _____ of hours for summer cooling.
What is 99% and 1%?
Expressed as a percentage, it measures how "full" the air is of moisture compared to the maximum amount of water vapor it could hold at that exact temperature.
What is the relative humidity?
The measurement of how many times the entire volume of air within a defined space is completely replaced in one hour.
What are air changes per hour?