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Plate heat exchangers for Moshe Aviv Tower

Background

Background for the Heat Exchanger Plates project for the Moshe Aviv Tower

In 1995, begun the planning of the highest skyscraper in Israel. In 2001, the 235 meters high tower has been occupied. Until 2017, when the Azrieli Sarona building was built, also with heat exchangers provided by us, the Moshe Aviv Tower was the tallest skyscraper in Israel and probably also in the Middle East.
Moshe Aviv Tower Moshe Aviv Tower

The objective

In a skyscraper which employs a water system that diverges at heights of up to 250 meters with a 25 bar water column on the basement floors, each and every system component is of critical importance.

The challenge

A plate of heat exchangers producer is faced with a number of integrated challenges in cracking this project.

Firstly - heat exchangers must maintain a high pressure, two heat exchangers must be engineered to operate vis-a-vis polluted water from open-circuit cooling tower and maintain internal cleanliness and heat transfer capacity for as long as possible. This is due to the high cost of maintenance operations in cramped machinery rooms set apart in a mechanical equipment building. Another challenge - the heat exchanger structure must be designed for ease of handling and maintenance. Those stringent parameters required heat exchangers that meet the highest industrial standard ISO 15477. In order to meet those multitude challenges, Krashin-Shalev reinforced structured heat exchangers were selected. These heat exchangers also withstood static and dynamic pressures, and were also constructed with asymmetric plates with a wide net clearance of 3.3 mm.

The Project’s Solution

In order to achieve the project’s goal, the HVAC consultant designed special cooling towers to be built on the upper floors of the building and employed pressure breaker heat exchanger technology. One circuit of the heat exchangers located on the middle floors of the tower, receives high pressure from the upper floors and the other circuit provides water to the lower floors at a lower pressure.

The outcome

Plate heat exchangers for the Moshe Aviv Tower were provided in 1999. Even not a single leakage was could be identified throughout their entire operation span. The first maintenance interval of only one of the hardest-working heat exchangers was required in 2009, ten years after commencing operation and the second heat exchanger was unblocked for cleaning in 2018, almost 20 years after commencing operation and a number of other heat exchangers have been working for a generation since the building has been occupied, without ever unblocking them – which is an extraordinary accomplishment for this kind of equipment.

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