Template · Engineering
Sensible airflow heat load calculator
Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures.
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XLSXCSVODSXMLNumbers| Sensible airflow heat load calculator | |||||||||
| Example data — replace the blue input cells with your own. | |||||||||
| Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures. | |||||||||
| Populated records | 6 | Prepared capacity used | 10.0% | ||||||
| Total sensible load (kW) | 49.7596 | Peak: Sensible load kW | 13.5675 | ||||||
| Average: Sensible load kW | 8.2933 | ||||||||
| Active rows bar | ██ | ||||||||
| 60 record rows (6 sample rows shown). Blue cells are inputs; dark cells calculate. | |||||||||
| Zone / unit | Airflow m³ per h | Air density kg/m³ | Specific heat kJ/kg·K | Supply °C | Return °C | Temperature diff °C | Mass flow kg/s | Sensible load kW | Scale bar |
| Conference zone cooling | 1,800.0000 | 1.2000 | 1.0050 | 14.0000 | 24.0000 | 10.0000 | 0.6000 | 6.0300 | █████ |
| Open office cooling | 3,600.0000 | 1.2000 | 1.0050 | 15.0000 | 24.0000 | 9.0000 | 1.2000 | 10.8540 | ██████████ |
| Perimeter zone heating | 1,200.0000 | 1.2000 | 1.0050 | 32.0000 | 20.0000 | 12.0000 | 0.4000 | 4.8240 | ████ |
| Conference zone cooling (4) | 2,700.0000 | 1.2000 | 1.0050 | 21.0000 | 36.0000 | 15.0000 | 0.9000 | 13.5675 | ████████████ |
| Open office cooling (5) | 2,880.0000 | 1.2000 | 1.0050 | 12.0000 | 19.2000 | 7.2000 | 0.9600 | 6.9466 | ██████ |
| Perimeter zone heating (6) | 1,500.0000 | 1.2000 | 1.0050 | 40.0000 | 25.0000 | 15.0000 | 0.5000 | 7.5375 | ███████ |
Showing the first 16 of 72 rows and 10 of 10 columns. Cells with formulas show the formula on hover.
| Sensible airflow heat load calculator |
| Method, inputs, and limits for this workbook. |
| What it does |
| Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures. |
| How to use it |
| Replace the fictional records in blue cells with your own data. Keep the dark formula cells. Use the units stated in the column headers and keep each record on one row. Read the calculated columns and inspect the results before using them.… |
| Formulas and method |
| Temperature difference is the absolute difference between return and supply temperatures. Mass flow converts cubic meters per hour to kilograms per second using air density, and sensible load multiplies mass flow, specific heat, and temper… |
| Assumptions and limits |
| Covers sensible heat transfer only and excludes latent moisture loads, duct leakage, fan heat gain, and altitude density corrections unless reflected in the entered density. |
| Missing numeric inputs |
Showing the first 16 of 72 rows and 4 of 4 columns. Cells with formulas show the formula on hover.
What does this template do?
Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures.
Temperature difference is the absolute difference between return and supply temperatures. Mass flow converts cubic meters per hour to kilograms per second using air density, and sensible load multiplies mass flow, specific heat, and temperature difference.
Covers sensible heat transfer only and excludes latent moisture loads, duct leakage, fan heat gain, and altitude density corrections unless reflected in the entered density.
The working tab keeps editable inputs separate from formulas, with 6 populated sample rows, summary KPIs, an in-cell scale bar, and room for 60 records. The Notes tab explains the method and how to extend the range. All example records are fictional and can be replaced. Download a workbook format to retain formulas, or CSV when you need calculated values only.
What’s inside
- Temperature difference is the absolute difference between return and supply temperatures. Mass flow converts cubic meters per hour to kilograms per second using air density, and sensible load multiplies mass flow, specific heat, and temperature difference.
- 60 prepared record rows with blank-row guards and in-cell scale bars
- Summary KPI block with peak, average, and capacity tracking
- Blue input cells, typed dates and numbers, and frozen column headers
- Notes with the method, assumptions, and range-extension instructions
Which tabs does the workbook have?
| Tab | What it holds |
|---|---|
| Worksheet | Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures. |
| Notes | How to use the workbook, formula method, assumptions, and file format limits. |
What formulas does this template use?
This template holds 246 formulas in 320 cells across 2 tabs, so 77% of its cells calculate. They use 14 distinct functions; the longest formula is 134 characters.
| Function | Uses | What it does |
|---|---|---|
IF | 484 | one result when a test is true, another when false |
COUNT | 182 | counts numeric cells |
MAX | 182 | largest value |
OR | 120 | true when any test is true |
MIN | 61 | smallest value |
REPT | 61 | repeats text |
ROUND | 61 | rounds to a number of digits |
ABS | 60 | absolute value |
ISNUMBER | 60 | true for a number |
NOT | 60 | reverses true and false |
COUNTA | 4 | counts non-empty cells |
COUNTIF | 2 | counts cells meeting one condition |
The 12 most used of 14 functions. Counted from the workbook itself. Only functions that Excel, LibreOffice Calc, Google Sheets and Apple Numbers evaluate the same way are used, so the formulas survive every download format.
How do you use it?
- Replace the fictional records in blue cells with your own data. Keep the dark formula cells.
- Use the units stated in the column headers and keep each record on one row.
- Read the calculated columns and inspect the results before using them. Clear unused input rows; keep their formulas.
- The prepared range holds 60 records in rows 11–70. Extend formulas and summary ranges together if you add more rows.
What is it good for?
- Calculate air mass flow rate and sensible heating or cooling load in kilowatts from volumetric airflow and air temperatures
- Replacing the labeled fictional records with your own figures
- Checking a calculation before adapting it to a larger workbook
Questions about this sheet
How is the result calculated?
Temperature difference is the absolute difference between return and supply temperatures. Mass flow converts cubic meters per hour to kilograms per second using air density, and sensible load multiplies mass flow, specific heat, and temperature difference.
What assumptions should I check?
Covers sensible heat transfer only and excludes latent moisture loads, duct leakage, fan heat gain, and altitude density corrections unless reflected in the entered density.
Can I add more than 60 records?
Yes. Copy the formula columns into new rows and extend every summary range to include them. Keep inputs and formulas in their original columns.
Are the example records real?
No. All example data is fictional and intended to demonstrate the formulas. Replace it before using the workbook for your own work.