Plate Heat Exchangers

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PHE

Plate Heat Exchangers
FILE NO: DATE: SUPERSEDES: DATE: 113.12L August 2010 113.12 April, 2009

PHE

Efficient Heat Transfer in a Compact Design

Armstrong’s gasketed Plate Heat Exchanger (PHE) product line includes more than 20 different models and offers numerous configurations, connections and material options, providing a superior heat transfer solution for any HVAC application.

Market Challenges
Rising demand for tenant space in commercial buildings and an ever-increasing focus on reducing energy consumption have created numerous challenges for designers and contractors. These challenges include the requirement for mechanical room optimisation and energy recovery or free cooling systems such as water-side economisers, geothermal heating/cooling and deep-lake water cooling. There is now, more than ever, a growing demand for compact heat exchangers capable of transferring heat at low approach temperatures to achieve greater temperature crossing, which saves energy. In addition, factors such as global warming, high frequency of building conversions, and tighter plant rooms have led to a demand for heat exchangers that can be maintained easily and are flexible with regards to future expansion.

Tin
Temperature

Tout

Temperature Cross Tout Tin
Gradient

Temperature Approach

Plate Heat Exchangers
Adding Value to Hydronic Systems
Space Savings
Due to their higher heat transfer capabilities, Armstrong X- Series plate heat exchangers can take up less than other designs, yet provide the same or better performance. The X-series plate have an extremely efficient plate pattern that produces higher heat transfer coefficients, less heat transfer surface area required and a smaller footprint especially for HVAC applications. For a typical cooling application of 1500 kw, the SX90-2000 provides the most compact solution for a given capacity.

Plate Removal Space

Plate heat exchanger footprint Space required in metres (feet) = 0.7 (2.3) x 2.3 (7.5) = 1.6m2 (17.3 ft2) Based on Model SX96-2000

Project Risk Minimisation
All units are certified for safety by the appropriate agency (i.e. PED, ASME, TSSA, etc). Heat transfer plates can be added, replaced or removed easily to maintain or increase the system performance. Gaskets are vented between passages, so there is no cross contamination from a gasket failure. Every unit is provided with a safety shield that surrounds the plates and gaskets. Double-wall heat transfer plates are available for domestic water applications. Select models are available with a design pressure up to 24 bar (400 psi).

Maintenance
Single-pass PHE units are designed with all four system connections on the fixed head. This ensures the unit can be easily maintained without having to break the connecting piping. In addition, plate heat exchangers can be installed in a corner of a mechanical room to optimise the space. When maintenance is required, plates can be removed and installed from one side of the unit. The gaskets are simple to replace and do not require any glue.

Installation Advantage
Connections are typically on the same plane for easy piping. Studded flanged connections reduce piping loads on the plate heat exchanger. Units can be certified at the factory and then shipped disassembled for delivery and installation in tight quarters. The vertical piping arrangement (inlet on top and outlet on bottom) of PHE Series units makes them ideal for condensing steam service.

Energy Efficiency
The Armstrong PHE Series achieves the highest efficiency and heat transfer rates by flowing the two media in opposite directions (counter-current) in a highly turbulent fashion. The temperature gain or loss between the hot fluid and the cold fluid at a given flow rate is the regeneration rate. With counter-current flows, high turbulence and optimized corrugation, Armstrong Series PHE units provide regeneration rates of up to 90%. % Regeneration = ( Tin [hot fluid] - Tout [hot...
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