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RED Calc Free Help Tool Descriptions
RED Calc Tool Descriptions

Tool Descriptions

Ventilation Tools

This bundle of tools includes all you need for your ventilation design and analysis. The Department of Energy (DOE), the Building Performance Institute (BPI), and RESNET are requiring design and analysis of residential ventilation systems. These ventilation tools will help you get your work done fast, accurately, and with professionalism.

ASHRAE 62.2-2016 tool / user guide

for calculating whole-dwelling ventilation for new and existing dwellings according to ASHRAE Standard 62.2-2016, Ventilation and Acceptable Indoor Air Quality in Residential Buildings. Also calculates fan run-time for intermittent fan operation and allows you to determine the measured leakage rate corresponding to a chosen whole-dwelling mechanical ventilation rate.

ASHRAE 62.2-2013 tool / user guide

for calculating whole-building ventilation for new and existing buildings according to ASHRAE Standard 62.2-2013, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. Also calculates fan run-time for intermittent fan operation and allows you to determine the building leakage rate corresponding to a chosen whole-building mechanical ventilation rate.

ASHRAE 62.2-2010 tool / user guide

for calculating whole-building ventilation for new and existing buildings according to ASHRAE Standard 62.2-2010, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. Also calculates fan run-time for intermittent fan operation.

ASHRAE 62.2 California tool / user guide

for calculating whole-building ventilation for new and existing buildings according to the California version of ASHRAE Standard 62.2-2010, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. Also calculates fan run-time for intermittent fan operation.

Ventilation Elec Usage tool / user guide

for determining the electrical cost of operating a ventilation fan (or other electrical load) for a year (or other period). This tool will work for continuous or intermittent operation of a fan.

Depressurization (DTL) Analysis tool / user guide

for determining the DTL CFM50, the maximum exhaust appliance airflow rate for a given DTL or house pressure, or the negative pressure threshold for a given DTL and appliance airflow rate. This is a "solve-all" tool, meaning you can solve for all or most of the tool variables by checking the radio button to the left of the variable name.

Pitot Tube Airflow tool / user guide

for determining airflow in a duct if you have a pitot tube and a digital manometer. This is a great method for measuring the flow rate of a range exhaust hood or a clothes dryer if you have access to the duct.

Box Airflow tool / user guide

for measuring exhaust fan airflow with a cardboard box and digital manometer. You must cut a rectangular opening in the box and attach your manometer to the box with a hose.

Moisture Tools

This bundle of tools includes all you need for analyzing moisture issues in buildings, including dew point temperatures, vapor pressure, humidity ratios, and much more.

Moisture Metrics tool / user guide

for relating dry-bulb temperature, saturation (equilibrium) vapor pressure, relative humidity, dew point temperature, water vapor density, vapor pressure, wet-bulb temperature, and humidity ratio.

Wood Moisture Content tool / user guide

for determining relative humidity or wood Equilibrium Moisure Content EMC. Enter the air temperature and equilibrium moisture content of a sample piece of wood that has been in the space. The RED tool will calculate the average relative humidity for you. Or enter the air temperature and the EMC to find the average relative humidity.

Air Leakage Tools

This bundle includes tools for determining natural air leakage (infiltration) rates and the resulting sensible heat loss or gain. The dependency on building leakage, building height, flues, leakage distribution, sheltering, terrain, and weather conditions can be explored. The calculations use the same, powerful infiltration model, AIM-2, that was used to calculate the weather and shielding factors for the ASHRAE 62.2-2013 ventilation standard. These tools are a part of our ongoing work to bring the wealth of knowledge and capabilities that exists in our national labs to our users.

Air Leakage Metrics tool / user guide

for converting among eight leakage metrics including ACH50, Equivalent leakage area (EqLA), Effective leakage area (ELA), Specific leakage area (SLA), and more. Determine if your building complies with the International Energy Conservation Code or Energy Star Qualified Homes requirements for ACH50 or the Washington State requirement for SLA. Determine a target tightness value for your crew.

Zone Pressure Diagnostics tool / user guide

for performing Zone Pressure Diagnostics (ZPD) calculations with the most advanced methods, but with simplicity. Determine air leakage through and leakage area in the interior and exterior pressure boundaries of a zone. Find the zone's contribution to whole-house leakage. Appraise the effectiveness of your air sealing work, and much more.

Design Infiltration with AIM-2 tool / user guide

for calculating stack-induced, wind-induced, and the combined infiltration, as well as the resulting sensible heat loss or gain, for given indoor/outdoor temperatures and wind speed. The primary use case is determining the design infiltration rate that can be used in a heating or cooling load calculation for system sizing.

Advanced Infiltration with AIM-2 tool / user guide

for calculating hourly (low, average, and high) stack, wind, and total infiltration; the effect of combining whole-building ventilation and natural infiltration; and the load on a heating and/or cooling systems due to ventilation and infiltration. Additionally, three separate charts provide graphical representations of these results. All calculations are based on TMY3 weather data and may be restricted to a date range (one day to one year).

Insulation Tools

This bundle includes tools for determining R-value, the number of bags of insulation, and insulation density. These tools will help you get your estimating and analysis done fast and accurately.

Dense-Pack Insulation tool / user guide

for calculating installed density or the number of bags of insulation. This tool will work of any dense-pack insulation and accommodates hidden or exposed framing.

Loose-Fill Insulation tool / user guide

for calculating installed depth, settled depth, settled R-value, or number of bags of insulation when installing loose-fill cellulose or fiberglass.

Surface Heat Transfer tool / user guide

for determining surface heat transfer. This solve-all tool also allows you to solve for temperature difference, time, R-value, and area.

Infrared R-value tool / user guide

for calculating R-value or interior surface temperature with your infrared measurement device (infrared camera or thermometer). This is a great tool for determining if a wall is insulated or not and, if it is, what the effective R-value is.

Parallel-Path Equivalent R-Value tool / user guide

for calculating overall R-value, U-factor, or total UA value of a building section made up of up to 10 distinct R-values. For example, the framed area and the insulated area of a wall (2 distinct R-values).

Domestic Hot Water Tools

These tools help you analyze hot water use, allow you to compare hot water systems, and guide you through the procedure of determining flow rate from a fixture.

DHW Systems Comparison tool / user guide

for comparing up to three DHW systems with a base-case system. You can use this tool for any hot water system for which you have an Energy Factor (EF) and a fuel price per unit. This tool can also be used to determine the savings from lowering the hot water supply temperature.

DHW Average Daily Usage tool / user guide

calculates average daily hot water use based on the amount of hot water used by various appliances and use incidents. Default usage values are included.

DHW First Hour Rating tool / user guide

helps you determine the First Hour Rating for the purpose of sizing a storage water heater. This method is based on guidance from the Air-Conditioning, Heating and Refrigeration Institute (AHRI), the industry standard for sizing storage water heaters.

DHW Instantaneous Sizing tool / user guide

is a "solve-all" tool used for sizing an instantaneous (tankless) hot water heater. It can also be used to determine the maximum hot water flow rate for a given system and temperature rise.

DHW Volume per Use tool / user guide

determines the volume of hot water used given an amount of mixed (hot + cold) water used and the temperatures of the hot, cold, and mixed water. The amount of mixed water can be specified by volume directly, or from a flow rate and duration.

Water Flow Rate tool / user guide

is a "solve-all" tool that relates the volume of water drawn, the duration of the water draw, and the flow rate. The primary expected use case is determining flow rate using a test container with known volume and a stop watch. The tool was developed as an aid in using the DHW Volume per Use tool when flow rate is used and must be determined, but may also be used for more general purposes.

Weather Tools

These tools report and analyze weather data. Often it is useful to use these tools with other RED Calc tools. For example, it is useful to use the Weather Station Data (TMY) tool to find your closest weather station before using the ASHRAE 62.2-2013 Ventilation tool.

Weather Station Data (TMY) tool / user guide

for finding the Typical Meteorological Year (TMY) weather data for 1100 weather stations in North America. Weather station latitude, longitude, and altitude (elevation) are displayed. Additionally, dry bulb and dew point temperatures and wind speed are displayed in a table for the selected date range. An embedded Google map helps in locating the nearest weather station location and an interactive charting feature allows you to analyze weather data.
Version 2016-07-06
© 2015 Residential Energy Dynamics, LLC
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Copyright 2016 Residential Energy Dynamics, LLC