The calculator is available for free download and lets you see real-time energy connections among building components, isolate the effects of a change to a single energy parameter or produce concept-level energy estimates. Not only can you see real-time energy connections, but you can calculate total CO2 emissions for a building from both electricity and gas consumption.
This software allows the user to calculate the heat load of a given application. Heat load is the amount of heat that must be removed from the cabinet (box) in order to maintain the target temperature.
heat load calculator free download
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This heating system sizing calculator is based on the ASHRAE standards. This calculator will calculate heating loads for air conditioning systems for residential places.Important notes:
Chvac quickly and accurately calculates the maximum heating and cooling loads for commercial buildings. The cooling loads can be calculated with either the CLTD method or the new RTS (Radiant Time Series) method. The program allows an unlimited number of rooms which can be grouped into as many as 100 air handling systems. Chvac automatically looks up all cooling load and correction factors necessary for computing loads. In addition, it can look up outdoor design weather data for over 2000 cities located around the world. There is also provision for editing the weather data as well as adding data for other cities. Comprehensive reports list the general project data, detailed room loads, air handler summary loads, outside air loads, total building loads, building envelope analysis, tonnage requirements, CFM air quantities, chilled water flow rates (if applicable), and complete psychrometric data with entering and leaving coil conditions. Other outstanding features include ASHRAE Standard 62 analysis, automatic building rotation, 360 degree wall orientations, tilted glass, exterior shading, internal operating load profiles, variable indoor design temperatures, people diversity, pretreated outside air, seasonal infiltration and ventilation rates, reheat loads, duct gains and losses, and return air plenums.
Chvac contains many, many advanced features. Here are just a few of its capabilities. Calculates Peak Heating and Cooling Loads Calculates Both Heating & Cooling CFM Requirements Calculates Runout and Main Trunk Duct Sizes Automates Compliance with ASHRAE Standard 62 Provides Overall Building Envelope Report Creates Spreadsheet File with Calculated Results Performs Complete Psychrometric Analysis Prints Bar Graphs and Exploded Pie Charts Exterior Shading Handles Overhangs, Fins, & Glass Tilt Uses Exact ASHRAE RTS or CLTD Procedures Built-in Design Weather Data for Hundreds of Cities Analyzes Up to 12 Months Per Calculation Calculates 24 Hours per Design Day Allows Unlimited Number of Rooms per Project Rooms May Be Grouped Under 100 Air Handlers Rooms May Be Optionally Grouped Under VAV Boxes Allows 100 Walls, 100 Windows, and 100 Roofs per Room Allows Simultaneous Infiltration and Ventilation Allows Different Summer and Winter Air Rates Allows Different Indoor Conditions for each Room Allows 20 Master Roof Types, 20 Master Wall Types, 20 Master Partition Types, and 50 Master Glass Types Provides a User-Defined Library of Custom Materials Provides a List of your Favorite Materials Allows Up to 10 Internal Operating Load Profiles Allows Full 360 Degree Wall and Glass Orientations Allows Glass to be titled from 0 to 180 degrees Allows for Roof and Wall Color Effects Provision for Both VAV and Constant Volume Systems Proper Handling of Return Air Plenum Loads Accounts for People Diversity in Total Building Load Computes Supply Fan Horsepower and Heat Gains Accounts for Both Draw-thru and Blow-thru Fans Calculates Reheat Requirements if Necessary Computes Supply and Return Duct Gains and Losses Allows Direct Specification of Supply CFM Quantities Allows Specification of Minimum Supply Air Quantities Allows Heating Only, Cooling Only, or Both Excess Supply Air Can be Handled as Reheat, Reserve Capacity, or by Adjusting the Leaving Coil Conditions Leaving Coil Conditions Can be Specified with a Desired Dry Bulb Temperature or a Relative Humidity Calculates Chilled and Hot Water Coil Flow Rates Allows for Pretreated Outside Air Calculates benefits of Heat Recovery Ventilators (HRV) for heating and cooling Allows Heating and Cooling Safety Factors Lighting & Equipment Watts along with No. of People can be Entered Directly or on a Per Square Foot Basis Selects Equipment from the ARI/GAMA Databases Creates Custom Sales Proposals Creates Spreadsheet Output File
Calculation Method Chvac performs cooling calculations using either the CLTD method or the new RTS (Radiant Time Series) method. The RTS method is described in the latest edition of the ASHRAE Handbook of Fundamentals, while the CLTD method is from earlier editions of the Handbook. The RTS method is especially accurate because it calculates the delayed effect of radiant heat gains during each of the past 24 hours in determining the current cooling load. That means, for example, that the program gives proper consideration to the effect of an external shading device that shades a window in the morning in a room that peaks in the afternoon. The CLTD method, on the other hand, uses exact table values from the Handbook where possible, which means that you can verify the results by hand. You can actually switch back and forth between RTS and CLTD for any project. All you have to do to switch between the two methods is to enter equivalent Master Data definitions for roofs, walls and glass and then change the Cooling Calculation Method input to the other method.
Five types of data are requested: general project data, outdoor design data, building material data, air handler data, and specific room data. The general project data includes the project and client name, designer, building opening and closing hours, internal operating load schedules, and any desired safety factors. The outdoor design data includes the summer and winter outdoor design conditions (automatically looked up for you if a city reference is given) and the desired ventilation and infiltration rates. The building material data includes the definition of master building material types for roofs, walls, partitions, glass sections, and exterior shading. A user defined material library is available for saving the data on common material types. The air handler data includes the fan and terminal type, the desired heating and cooling supply air temperatures and data for duct heat gains and losses. The room data includes the room name, floor length and width, number of people, equipment watts, lighting watts, external shading data, and specific roof, wall, partition, floor and glass data.
Chvac not only calculates peak heating and cooling loads, it also aids in selecting HVAC equipment and analyzing building operating costs. Project data from Chvac can be exported to Elite Software's Energy Audit program as well as to the eQUEST program (see more info in this paragraph). In the future, we plan to also provide a link to the Energy Plus program. Export to Energy Audit when you want to analyze residential and light commercial projects, essentially any application which uses unitary HVAC equipment. Export to eQUEST when you want to analyze large commercial projects that require precise modeling of variable loads, equipment, operating schedules, and control schemes. For just selecting unitary HVAC equipment, use the built-in Find HVAC Equipment feature of reading equipment performance databases published by the American Refrigeration Institute (ARI) and the Gas Appliance Manufacturers Association (GAMA).
Using the free eQUEST program with Chvac gives you a complete load calculation and energy analysis package. First, you enter your project in Chvac and let it determine your peak loads. Then, you export a ready-to-open eQUEST project file from Chvac. Then you open that project in eQUEST, and enter any additional data you want to enter that is specific to eQUEST. Then eQUEST will let you perform a detailed energy analysis. The eQUEST program can also be used to perform the calculations required for the energy portion of LEED certification, as described in an article in the September 2007 ASHRAE Journal (page 58 and following).
HeatCAD 2022 is a drawing-based software for fast and accurate calculation of residential heating and cooling loads. The Professional Edition supports ASHRAE and CSA residential heat loss calculations. The MJ8 Edition provides ACCA®-Approved Manual J® (8th Edition) calculations for residential heating and cooling loads (more on Manual J...). HeatCAD delivers advanced design features including integrated load calculations, automatic detection of unheated surfaces, and 3D CAD views. Try it now free for 30-days.
When I'm looking at the NEEP tables, and seeing if my heating load lies in between the 5 degree and 17 degree values (as you suggested, but I think you had a typo), should I be looking at "maximum" or "rated" ?
Unless the room below is going to be more than 10F cooler than your target temp it should not count in the heat load. Unless the floor itself is heated, the temp at the floor is almost always going to be 3-5F cooler than the average room temp, and the ceiling is going to be 3-5F warmer, all due to normal stratification. So the ceiling of a fairly cool 60F room is going to be 63F-65F, and the floor of the 70F room above is going to be 65F-67F. Allowing even R2 (U0.50) using the horizontal air films plus the material of the flooring/subfloor, the heat transfer at such a low temperature difference is "in the statistical noise" relative to inherent errors in the U-factor estimates for walls/ceilings/floors that have a significant temperature difference. 2ff7e9595c