Acronyms
If your filing a project for Energy Code in New York City, you'll have to follow one of these two two possible compliance paths
What are NYC ECC or ASHRAE 90.1?
- New York City Environmental Conservation Code
- American Society of Heating Refrigerating and Air Conditioning Engineers, Standard 90.1
This type of fan, commonly seen in air handler fan arrays, is lauded for its high efficiency, quiet operation, and uniform distribution.
What is a plenum fan?
When Trace 700 was being discontinued, AKF adopted this new load calculation software, before it was also discontinued.
What is Cove Tools?
Typically identified as a delta h on the psychrometric chart, this property is used to solve for the total cooling energy required to calculate your total cooling load requirement
What is Enthalpy?
IF a pump operates at below its net positive suction head, this will occur
What is Cavitation
Be clean out there! If you're working in a critical environment you might want to check this rating on the filter of your HVAC unit.
What is MERV? Minimum Efficiency Reporting Value
OR What is HEPA
High Efficiency Particular Air
By progressively increasing pressure through each stage, this having more than one of this component is critical within a multistage pump.
What is an impeller?
The group of equations used to describe the relationship between variables involved in pump and fan performance are know as this
What are the Fan/Pump Affinity Laws?
Also acceptable: Fan Laws, Pump Laws, Affinity Laws
An AHU sized for this percentage of outside air would provide an outside air ACH of 2 when the total ACH requirement for the space is 6
What is 33%
In an Adiabatic system, this can be transferred in or out of the system
What is Energy
These three acronyms are commonly referenced when looking at a pump curve and performance.
What are ?
A common problem in water-cooled chillers caused by improper water treatment, reducing heat transfer efficiency in the condenser tubes.
What is fouling?
When following the prescriptive path for energy filing, compliance can be demonstrated by submitting either of these two documents
What are Tabular Analysis and Comcheck?
A common misconception when calculating pump head, this parameter is substantially more important in open loop system compared to closed loop systems.
What is static pressure differential (or what is pressure due to elevation change)?
The name of a process which remains at constant volume
What is an Isochore
These 2 acronyms are commonly used describe the impact a refrigerant will have on the environment if released into the atmosphere
What are GWP and ODP?
Global warming potential
Ozone Depletion potential
This component is added to variable refrigerant flow (VRF) heat pumps to improve efficiency by subcooling the refrigerant before it enters the evaporator.
What is an economizer?
This is the term for air that falls along the curved top-left line of the psychrometric chart
What is Saturated?
We know it, we love it….the sensible heating equation can be reconfigured to solve for this variable when given CFM and btu/hr.
What is the change in air temperature (or what is the dry bulb)?
Thermodynamic cycle with maximum theoretical efficency
What Is Carnot Cycle
Better check one of these performance metrics if you want to know how well is your new HVAC equipment going to performance compared to minimum allowed by code (name at least 4 different)
What are:
This component automatically opens to release steam when the system pressure exceeds a preset limit.
What is a safety relief valve?
Get comfy! Trousers, knee-length skirts, and sweatpants are some of the clothing options available when calculating thermal comfort according to this standard.
What is ASHRAE 55?
Humidification load can be calculated using CFM and this variable, commonly found on the psychrometric chart
What is the difference in the humidity ratio (or delta W)
This Scotish scientist coined the term Potential energy
Who is William Rankine