# Hvac Formula

## HVAC FORMULAS TON OF REFRIGERATION - The amount of heat ...

Posted on 23-Oct-2019

HVAC FORMULAS TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) of ice at 32°F 288,000 BTU/24 hr. 12,000 BTU/hr. APPROXIMATELY 2 inches in Hg. (mercury) = 1 psi WORK = Force (energy exerted) X Distance.

http://www.descoenergy.com/pdf/HVAC%20Formulas.pdf

## HVACR FORMULAS - hvacrassets.net

Posted on 23-Oct-2019

HVACR FORMULAS . TON OF REFRIGERATION - The amount of heat required to melt a ton (2000 lbs.) of ice at 32°F . 288,000 BTU/24 hr. 12,000 BTU/hr. APPROXIMATELY 2 inches Hg. (mercury) = 1 psi. WORK = Force (energy exerted) X Distance . Example: A 150 lb. man climbs a flight of stairs 100 ft. high.

https://hvacrassets.net/handouts/mod1-111_handout1.pdf

## USEFUL HVAC FORMULAS - About Us

Posted on 23-Oct-2019

useful hvac formulas electrical: power (watts) = volts (v) x amps (a) *in single‐phase (1ø) applications with no power factor correction. power (watts) = volts x amps x 1.73 *in three‐phase (3ø) applications with no power factor correction..

## hvac design formulas - HVAC Designs – HVAC Designs ...

Posted on 23-Oct-2019

Title: hvac design formulas.pdf Author: HVAC 1 Created Date: 1/19/2017 1:52:23 PM.

## HVAC Formulas: VAV Box Air Flow Rate (CFM) - Computrols

Posted on 23-Oct-2019

HVAC Formulas: VAV Box Air Flow Rate (CFM) The following equation calculates the refrigeration output in Tonns of a chiller. INPUT VARIABLES A Duct area in sq. ft PV Pressure in inches of H2O from PV3 EQUATION Q AV 0.0763 IS THE DENSITY OF DRY AIR AT 60O F THE DUCT DIAMETER UNITS ARE IN FT..

## HVAC Economizers 101 Section #9 Determining the TRUE % of ...

Posted on 23-Oct-2019

HVAC Economizers 101 Section #9 Determining the TRUE % of Outside Air Using Charts and Formulas 9-1. Section #9-Determining the TRUE % of OSA Using Charts and Formulas • The TRUE percent (%) of outside air entering into the building via the air handling unit is found by using percentage charts or formulas. The next f OA Percentage Formula couple o slides will demonstrate both. % OA = X 100 ....

https://buildingretuning.pnnl.gov/training/economizers/PNWD-SA-8511%20HVAC%...

## Arlan Burdick IBACOS, Inc. - nrel.gov

Posted on 23-Oct-2019

HVAC contractor, and other trade partners to understand the importance of appropriately calculating peak heating and cooling loads, as the first step of HVAC system design. Accurate load calculations have a direct impact on energy efficiency, occupant comfort, indoor air quality, and building durability. The load calculation is the first step of the iterative HVAC design procedure, as a full ....

https://www.nrel.gov/docs/fy11osti/51603.pdf

## HVAC Right-Sizing Part 1: Calculating Loads

Posted on 23-Oct-2019

• The measure of energy the HVAC system needs to add or remove from a space to provide the desired level of comfort – Btu/h • Not the . size. of the HVAC system – First piece of information needed – 12,000 Btu/h = 1 Ton Cooling • Can be. highly variable . What Is the Load? Put your presentation title or confidentiality info here. Big Picture: • Losses to the outside environment ....

https://www.energy.gov/sites/prod/files/2013/12/f5/webinar_hvac_calculating...

## HVAC Efficiency Definitions - usair-eng.com

Posted on 23-Oct-2019

The formula for calculating COP is shown below in EQ–9. COP = = EQ-9 Net Capacity (watts) (Gross Cooling capacity) – (Supply fan heat) Power Input (watts) supply fan + compressor(s) + condenser fan(s) Thus, a heat pump with a COP = 2.5 would produce two and a half times as much heat than the heat equivalent of the watts input. If electrical ....

http://www.usair-eng.com/pdfs/efficiency-definitions.pdf

## Cooling Load Calculations and Principles - CED Engineering

Posted on 23-Oct-2019

HVAC COOLING LOAD CALCULATIONS AND PRINCIPLES Sensible Heat Gain – is the energy added to the space by conduction, convection and/or radiation. Latent Heat Gain – is the energy added to the space when moisture is added to the space by means of vapor emitted by the occupants, generated by a process or through air infiltration from outside or adjacent areas..

## Heating formulas - Spirax Sarco International

Posted on 23-Oct-2019

Heating formulas Equation Use to calculate Formula 1 Steam load from kW heat rating kg / h 2 An air heater kW rating from the air flow and temperature rise kW 3 An air heater steam load from the air flow and temperature rise and the steam pressure in the heater kg / h 4 The amount of heat needed to change the temperature of a substance kJ.

http://www.spiraxsarco.com/documents/ti/gcm_13.pdf

## HVAC Formulas: Air Handling Unit Tonnage Output

Posted on 23-Oct-2019

INPUT VARIABLES OUTPUT VARIABLES T1 Entering air temperature of the coil in degrees F TONNS Dewpoint temperature in degrees F T2 Leaving air temperature of the coil in.

## NPLV rating is valid “weather” your - johnsoncontrols.com

Posted on 23-Oct-2019

A more comprehensive discussion of the NPLV formula can be found in HVAC&R Engineering Update 160.00-PM22, available from Johnson Controls. A more comprehensive discussion of multiple-chiller plants and the NPLV rating can be found in the International District Energy Association whitepaper “Application of ARI Standard.

https://www.johnsoncontrols.com/~/media/jci/be/united-states/hvac-equipment...