> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/plant-hvac/constant-air-volume-system-air-cooled.md).

# Constant Air Volume System (Air Cooled)

A Constant Air Volume System (Air Cooled) is a robust HVAC system with consistent air volume delivery. It regulates cooling by adjusting the air temperature through an air-cooled mechanism. This system ensures stability in airflow, providing reliable and efficient temperature control for diverse building spaces. 

<figure><img src="/files/HZTfp8YAfiyaq38vEIM5" alt=""><figcaption></figcaption></figure>

## Plant Chilled Water

<figure><img src="/files/6mZVpBVjk6nYr91G8eJf" alt=""><figcaption></figcaption></figure>

### Chillers

Specify the number of chillers.

### Chiller CoP

Specify the coefficient of performance of the chiller(s)

### Design Setpoint

Specify the chilled water supply temperature.

### Primary Pump Rated Head

Specify the Primary chilled water pump rate head in kilopascals.

### Secondary Pump Rated Head

Specify the secondary chilled water pump rate head in kilopascals.

### Design Delta Temperature

Specify the temperature difference between the chilled water return temperature and the chilled water supply temperature.

## Plant Hot Water

<figure><img src="/files/2pR34sg2ULneaNeAjlGt" alt=""><figcaption></figcaption></figure>

### Boilers

Specify the number of boilers.

### &#x20;Design Setpoint

Specify the hot water supply temperature.

### Pump Rated Head

Specify the hot water pump rate head in kilopascals.

### Design Delta Temperature

Specify the temperature difference between hot water return and water supply temperatures.

{% hint style="info" %}
Only on Premium Plans. Please reach for further [support](https://app.gitbook.com/o/WS5BGzA70OvplUrfmCf1/s/fKJnzF2TwHA3APPbiCpF/~/changes/232/support-and-training/contact-us).
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/plant-hvac/constant-air-volume-system-air-cooled.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.