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Total Pressure Method of Duct Design in HVAC

    In this article of HVAC, We will learn about Total Pressure Method of Duct Design..

Total Pressure Method

Total Pressure Method of Duct Design In HVAC

Total Pressure design in HVAC is based on the ductwork and the air flow distribution through the ductwork. When the unit is filled to the specified pressure, the ductwork and the air flow must be able to provide for that pressure. Any leakage and air-conditioning interruptions will occur if the ductwork and the air flow are not designed to handle this.

Total Pressure HVAC Units

Total Pressure Methods

A high-quality tube or pipe HVAC tube is selected because of its rigid and well-insulated material construction. Such material is used for pipes, ductwork and other components that need a long service life with little, if any, maintenance. It is also used in new construction to increase the building's energy efficiency and comfort by greatly reducing energy loss through ventilation.

Design of HVAC

An extensive technical report on the different types of HVAC ducts and the basic principles of its design can be found here: High Pressure Duct Design in HVAC. The key points of all the different types of HVAC ducts are:

● HVAC ductwork are categorized into the total pressure (TPP) and low pressure (LP) ducts.

● Total pressure ducts are designed to work under pressure to supply air through the ductwork to the desired performance levels.

● Low pressure ducts are designed to work under pressure, not under normal load.

HVAC ductwork

A tube or pipe HVAC ductwork has high pressure inside and low pressure outside the ductwork to control the ductwork and the air flow.


The two HSLI systems are, 1) High Temperature, Low-pressure and 2) Low-Temperature, High-pressure. The LPS/PPHTC system is a hybrid design, which is called hot-jet.

With the Total Pressure Method, the issue of ensuring quality and safety of pipework system are addressed by making sure that the pressure of the air flowing through the ducts is equal to the pressure of the flow through the individual ducts.

The Airflow Pressure required for adequate and safe delivery of ventilation air, is established by having flow equal to Airflow Pressure in the individual ducts.

How to design HVAC duct using Total Pressure Method?

There are different ways to approach the engineering design of a duct system. You can choose the best designed duct for you depending on what your needs are. You can use one of the most popular methods for duct engineering design that is the Total Pressure Method.

The Total Pressure Method involves testing the ground in front of the buildings for the presence of steel that will be required. The Total Pressure Method is an environmentally friendly approach to using duct work, which minimizes potential damage to people and property around the ductwork. It also reduces noise and emission of any pollutants.

The Total Pressure Method can be used in underground duct systems, while the many other ductwork is installed in existing buildings.

Design of Total Pressure Aeration System

The most appropriate method for Total Pressure Aeration System engineering design will depend on your requirements and the project type. In this article, we are going to look at the design of Total Pressure Aeration System using the Total Pressure Method, the easiest and fastest way to go about it.

Your Total Pressure Aeration System will be installed in the highest location where ductwork is required, and is required to control and produce the required airflow. You need to find out the prevailing wind direction, then calculate the pressure of the flow in that direction and the height of the flow.

The measured flow from the diffusers will be fed through a 36-inch pipe into a 24-inch duct. So you need to know the size of the openings you have in the duct, and how far away from the customer that you can install this. If you are putting the Total Pressure Aeration System in a house or building that is below the ground, you need to make sure that the vents and ducts are installed deep into the basement or below ground floor.

What is a Total Pressure Aeration System?

A Total Pressure Aeration System is an engineered duct system that combines the practical and the scientific, and involves the aeration of air using a pressure technique called Total Pressure Aeration System (TPAS). In other words, the term aeration refers to the opening of ductwork to air.

The Total Pressure Aeration System has a very good chance of improving the amount of air that your ductwork can handle. TPAS gives you the opportunity to make your ductwork last longer. It is also an excellent method of keeping the house cooler in summer and warm in winter, as it uses the latest technology to try to achieve the best results.

Total Pressure Method of Air Duct is gaining wide acceptance worldwide. With the rise of new technologies, there is an increase in the consumption of duct due to new construction and renovation projects. Total Pressure Method of Air Duct comes with various benefits. It is a cost effective solution, is suitable for all conditions, and maintains air quality.

Total Pressure Method of Air Duct is an alternative to traditional, hybrid and hot runners method. The hot runners method creates the heat during the ducting process. It is also known as Ducting and Finishing Air Duct and produces the cleanest air ducts and better performance. However, this hot runner method is difficult to adjust as duct work demands fine control, high speed, and tight tolerance of production. This method needs more labor, set up, and transport of machines.

Total Pressure Method of Air Duct follows multiple operations. Duct work begins with pre-pouring of the insulation foam in a box pattern. This foam is connected with the other components and put in a curing chamber. This component is assembled according to the design. The other components include ductwork, fixing, and glazing. This unit is run in a mould, where the ductwork is further pulled into the mold after heating. The main processes in total pressure method of air duct are:

• Spray duct

• Flatten duct

• Roughing

• Fitment and finishing

Various types of units are used for Total Pressure Method of Air Duct:

• The unit for spray duct is the lightweight, portable, and easy to use. The unit for flatten duct is one of the heavier and complex unit for ductwork. In total pressure method of air duct, both these units are used together to make ductwork.

HVAC and refrigeration ductwork offers the following features:

• The large diameter and efficient tools are important factors to achieve a fast and safe performance.

• It should be maintained to protect the system from corrosion, loss of HVAC efficiency, and mold.

• Quick working and hassle-free operation are the key advantages of HVAC and refrigeration ductwork.

• Ductwork, being a constant part of HVAC and refrigeration system, can get used in multiple applications.

• Dry materials must be converted to liquid materials for curing.

How to Design ducts using Total Pressure Method?

In this Total Pressure Method Tutorial, we are going to understand how to design ducts using TPR system. This method is the best design method available today. All you need to do is include suitable pressure, tune your TPR pressure, and make suitable measurement using template method. This can be done with minimal cost and time. All the TPR Ducts Designs Tutorial are given with step by step approach. So, feel free to go through these Total Pressure Design Tutorial and learn to design ducts.

Parameters used for Designing Total Pressure Ducts

Type of Sockets


Wood as a Medium


Duct Cores for DG

Layer design


TPR Duct Design

Duct sheet

Duct lining

Duct panels

Copper / Brass bits for Ducts

Direct PVC Pipe for TPR Design

Direct PVC pipe for Ducts

Step 1: Desolve Pressure

Step 2: Pressure Summarized

Step 3: Duct sheet & Duct lining construction

Step 4: Completing Duct Sleeves and Copper pipes

Step 5: Other Design Details

Duct design is a major part of the building design. Every inch of duct needs to be designed accordingly. Total Pressure Design System is most powerful method available today. To design ducts, you need to know three things and the number is four.

The first thing you need to know is the pressure, where are the points, and how much pressure you need. The reason is that the total pressure you need to design a duct is different from that of a little pipe. So, you need to know how much pressure to give to your pipe and know the volume of pipes you need. You can check the total pressure at point, for the TPR Ducts Design.

Second is the design area, where is the pipe going to be cut, and where the pipe will come in. You also need to find the elevation at the point where the pipe comes in to know the height of the pipe, in centimeters.

The last thing is the timing, timing at which the pipe will be cut.

Total Pressure Duct Design Step-By-Step:

First of all you need to calculate the pressure by weighing pipe and tape. You need to get the pipe and tape equal by weighing them. Next, you need to know the height of the pressure point and estimate it in meter. Calculate the pressure in mm/h to get the pressure in British units. Divide the mass by the pressure to get the gross weight. Divide the weight by the pressure to get the pressure in pounds/metric tons. We have two steps to calculate the pressure. First one is a weigh method.

Next step is TPR by Total Pressure.

How to Design ducts using Total Pressure Method?

Knowing how to design ducts can make all the difference in the success of your building project. Here are the steps to follow:

Step 1: Conduct a three-step test.

First, determine the pressure in each of the two respective ducts by noting the lowest measured pressure in the larger duct (on the inside wall, with the materials in situ) and then the lowest measured pressure at any point across the building's air wall.

Second, measure the pressure inside the building (outside the insulation) and compare that with the lower measured pressure in the larger duct.

Third, decide whether the difference between the two measurements is significant and, if so, measure the difference between the measured pressure within the smaller duct and the lower measured pressure.

If the difference in the measured pressure between the two ducts is smaller than the difference in the measured pressure within the building, you can use the Total Pressure Method to design and install ducts.

There are several ways to design ducts. Here are some of the most common approaches.

Method #1: Braced vs. Span Rack Design

Some companies make the mistake of assuming that you need to be particularly cautious when designing ducts. In fact, they believe you can guarantee safety only by using a brace.

A brace is a metal bar running horizontally between studs and only extends about 6″ down to the floor. It is the perfect length and even pressure to protect a duct's airtight seal.

However, a brace also holds the small area in between the studs in a duct open. A brace is also very heavy. The additional weight presents a safety risk and the large area between the studs presents a difficult design challenge.

Span racks and braces are safer choices, as they allow for thicker insulation and provide some acoustic and fire protection benefits. However, the added weight of the additional insulated materials can make them difficult to move and install.

Choosing a ceiling rack or brace can save you money in the long run, as they are both less expensive than specially designed ducts. A two-step approach might be your best bet.

If you must use a brace, it's best to take steps to prevent it from touching or touching the walls. There are numerous ways to do this, but keep in mind that the thicker the floor or ceiling materials, the better.

Method #2: 2-Step Design

Designers often believe it is easy to design a duct when you use only one method, such as Span Rack Design or Braced Braced Braced.

Not so.

You might think the simplest way to duct an area is to cut the wall and then extend the insulation directly behind the studs.

But that's not the case. If you used the Double Wall Method, you'd have only one sheet of sheetrock on each stud. Now you must make sure the sheets of plywood don't touch each other.

You also need to factor in the sheetrock and studs at both ends. So this is a two-step design.

The first step is to use a double-sided tape to run a pencil line along the exposed wall with the studs visible. This pencil line must extend all the way around the perimeter of the building so that no additional walls can be constructed.

The second step is to move the studs or make adjustments to existing studs to allow for the finished design. This should be done as soon as the studs are installed.

If you were to use the "one way" Method, you'd not be able to move the studs until you removed the double-sided tape. This can be a complicated and time-consuming process.

The Double Wall Method saves you the extra effort.

You'll be saving money, too. Depending on your needs, you can save between 40 and 60 percent by using a double-sided tape to design ducts.

In general, the wider the double-sided tape is placed, the more open the area is and the less expensive it is to build.

If you have two- and three-phase circuits in your home, you should consider a larger double-sided tape. It could allow for 3-ft.-wide double walled ducts to be installed with one turn. The costs would be similar to those for a single-sided tape.

If you plan on installing all of your ducts in one home, you should think twice about using a double-sided tape. The tiny opening will limit the room you can put ducting in.

Before you begin, make sure you have the proper tools and supplies.

Remember, you are creating a barrier that is going to be in place for many years.

This requires a steady hand and a consistent tape application.

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