RECUTECH Tips and tricks 2

Published on 20. September 2023

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Here are some tips and tricks collected from the Client Zone on our website:

Counterflow heat exchangers dimensions

	X	Y	Z		X	Y	Z
REK/REP +17	397	172	150-1000	RSF+16	366	366	100-600
REK/REP +23	455	230	150-1000	RSP+30	461	232	100-600
REK/REC/REP +27	496	271	150-1000	CXS+39	1034	809	200-1000
REK/REC +31	537	312	150-1000	CXS+53	1313	1088	200-1000
REK/REC +39	619	394	150-1000	CXS+67	1594	1369	200-1000
REK/REC +53	758	533	150-1000	CXS+81	1877	1652	200-1000
REK/REC +67	599	674	150-1000	CXS+95	2167	1942	200-1000
REK/REC +81	1040	815	150-1000	REC+120	1425	1200	200-600
REK/REC +95	1182	957	150-1000	REC+150	1725	1500	200-600

Sealing of counterflow heat exchangers

To avoid leaks inside the unit, it is recommended to apply the seal on the front of the exchanger in the form of a double cross.
The principle of sealing in basic terms of separation of “airflows” is: Always seal the wide bands with a sealer at the ends of the tray.
For narrow trays we recommend the use of mounting rails in the form of a small tray. The mounting rails must be sealed.

Placing multiple counterflow heat exchangers behind each other

Each heat exchanger has a tolerance of + 0-5 mm in width (ie length). It is necessary to use a seal between the exchangers that can cover this tolerance. For example, 7x heat exchanger REK+67-500-26 with a length of 500 mm + 0-5 mm have the total tolerance is 0-35 mm. The inner space of the chamber, where I will insert the exchangers, will have a space of 3,535 mm. We have to find a seal so high and at the same time so soft that it takes up a range of 6.5 mm. In this example, we would recommend using a 10 mm high seal with a considered compression of 50-60%.
It is important for the seal to be airtight. We would recommend materials such as Polyolefin foam or EPDM seal in the shape of “D”.
This types of sealants are used only on the faces (front trays) of heat exchangers.

Location of counterflow heat exchangers

Option 1 – place in the unit in the given place from the top.
In this case, we would recommend the same type of seal as would be used on the exchanger faces
Option 2 – inserting the exchangers from the side into the unit.
In this case, its recommended to use a tool to insert the exchangers from the side at the beginning of the unit and then move them to the desired place. It is necessary to have a seal on the friction surfaces. A sealant with a Teflon layer – it is strong, does not tear and is slippery.

Condensation drain tray

The tray must be sloped – an angle of about 2-3 ° is enough
Stainless steel or lacquered
The tray must be placed either directly below the heat exchanger or the condensate must be drained into the tray by means of “drips”.

QR code and labels

Every exchanger is individually labeled with information about its production process, leakage and quality control Our customers can use fields C D and F for custom text, barcode and QR code lines.

A – Model code

B – Leakage test

C – Text field (3 custom lines)

D – QR code (3 custom lines)

E – Serial number

F – Custom barcode

On average, our heat exchangers show leakages of less than 0.15% and are thus one of the tightest components for heat recovery in the market.

Client zone

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