# how to measure your coil

## Tube Arrangement

Before starting measuring your coil, you will need to determine what types of tubes arrange of your existing coil is.

There are 2 types of tube arrangements: Staggered and Aligned (or In-line) tube arrangements

### Staggered Tube Arrangement

Staggered tube arrangement is the most common arrangement provides a better heat transfer coefficient. Tubes are arranged in Triangular pitch (60 degrees/30 degrees depending on whether the coil is mounted horizontally or vertically). Below are examples of staggered tube arrangement of horizontal mount and vertical mount:

### Aligned (In-line) Tube Arrangement

Another types of tube arrangement is called aligned or in-line tube arrangment. Aligned or in-line tube arrangement is less efficient compared to staggered tube arrangement. Tubes are arranged into Square pitch (90 degrees).

## Row-Depth And Tube-Height

Next step is to count number of rows depth and number of tubes height of your coil.

**Row-depth**: is the thickness of your coil or depth of your coil’s fin-block. Row-depth can be either number of tubes counted in horizontal direction (if the coil is vertical mount) or in vertical direction (if the coil is horizontal mount).

**Tube-height**: represents front face of your coil, determines the height of your coil is if it is in vertical mount. Tube-height is number of tubes in one (1) row-depth.

### Aligned (In-line) Tube Arrangement

As for aligned tube arrange, it is a very easy and straight forward to determine tube-height and row-depth by counting number of tubes in vertical and horizontal directions respectively.

### Staggered Tube Arrangement

However, it is not that simple to determine row-depth and tube-height in staggered tube arrangement. For some, it might be a bit of confusion.

Below is our guide which will help you to determine row-depth and tube-height of your coil if its tubes are configured in staggered arrangement.

###### Your Coil Is Mounted Horizontally

If your coil was taken out and it is laying down horizontally on the ground, then you will determine its row-depth and tube-height as the drawing below:

Its row-depth will be determined by counting every row (including the offsetting row) in vertical direction.

Its tube-height will be determined by counting ONLY either top or bottom row in horizontal direction.

Therefore, in the drawing above, there are 2 rows (1 normal row and 1 offset row), therefore, it is 2 row-depth coil; and there are 3 tubes in the bottom row in horizontal direction, therefore, it is a 3 tube-height coil.

###### Your Coil Is Mounted Vertically

If your coil stands vertically, then its row-depth and tube-height will be determined as the drawing below:

Its row-depth will be determined by counting every row (including the offsetting row) in horizontal direction

Its tube-height will be determined by counting ONLY either the first or the last column in vertical direction

Similarly, there are 3 tubes in the first column, therefore, its tube-height is 3 tubes; and there are 2 rows (1 normal and 1 offset row), therefore, its row-depth is 2 row-depth