Recepto^™ Mechanical Ventilation Heat Recovery (MVHR) Units from Frenger^® are amongst the highest efficiency units available on the market, but also with shallow depth construction.

The Standard MVHR unit is designed to provide energy savings for a wide variety of applications, predominately for Schools, Academies, Universities and Offices or any space that requires mechanical ventilation (fresh air) whilst retaining most (up to 94% efficiency) of the heat from the extract air.

Note: For more compact and restrictive applications, such as office meeting rooms and domestic installations, Frenger^® offers the Recepto^™ Mini MVHR Unit.

The units transfer heat from extracted room air, via the use of a Eurovent certified aluminium static heat exchanger, to the fresh air supply with an efficiency of up to 94%.

MVHR units are high-efficiency static exchangers featuring aluminium plates with countercurrent exchange. The achievable efficiency can exceed 90% because they ensure the transfer of countercurrent heat between two air flows with different inlet temperatures.

The shallow construction depth is due to Frenger's Recepto^™ MVHR units having angle mounted centrifugal fans, which are low noise and more efficient than typical fans.

Construction

The external casing is made from 24mm double skin panels, using galvanised steel sheets pre-insulated with polyurethane foam (density 45 kg/m³). The foam uses a water based foaming agent (GWP-0). This construction allows for low noise levels.

The plug-type centrifugal fan for supply and return with an electronically controlled (EC) permanent magnet synchronous motor, supply voltage 230V 50Hz. The impellers are designed to ensure minimal noise and optimal airflow.

The air intake circuits use F7 (fine filtration efficiency) 98mm thick air filters with pleated microcells and M6 (average) for the exhaust circuit. These are sized to minimise pressure drops and are accessed by openings in the side of the unit for easy access. The Recepto^™ Standard units are fitted with air pressure switches to indicate when the filters require replacement.

The onboard electrical panel is accessible on the side of the unit. This panel includes the line fuse and electronic power board for the manual or automatic control of the operation of fans and air treatment accessories. The remote control features a display and capacitive-type touch keyboard.

In-House Project Specific Testing

Both of Frenger's Recepto^™ Standard and Mini MVHR units offer some of the lowest noise levels available on the market currently, with Frenger's in-house Acoustic testing facility at their UK technical facility allowing for optimisation of product noise levels during operation.

Frenger's HVAC products also undergo third-party acoustic testing to verify all sound power levels. The Acoustic Testing laboratory that can be seen below is their in-house hemi-anechoic chamber, which utilises sound absorbing acoustic foam material in the shape of wedges to provide an echo free zone for acoustic measurements.

Along with Acoustic Testing capabilities, Frenger^® also have 3x in-house Climatic Test Laboratories and 2x in-house Photometric Test Laboratories to provide complete Project Specific Testing.

The 3x state-of-the-art in-house Climatic Test Laboratories, which have internal dimensions of 6.3 x 5.7 x 3.2m, feature a thermal wall so that both internal and perimeter zones can be tested as well as simulating internal & external heat gains and losses. The Climatic Test facilities are fixed in overall size and construction and can facilitate both Steady and Non-Steady State Testing

'Dim men' are then placed in predetermined positions around the laboratory to simulate the small heat gains produced by office equipment such as computers or printers.

The two Photometric test laboratories at Frenger's UK technical and manufacturing facility are used to evaluate the performance of luminaires. To measure the performance, it is necessary to obtain values of the light intensity distribution from the luminaire and efficacy.

The intensity distribution is obtained by the use of a Goniophotometer, which measures the intensity of light emitted from the surface of the fitting at pre-determined angles.

The light intensity is then measured using either a photometer with a corrective spectral response filter to match the CIE standard observer curves or our spectrometer for LED sources. Frenger's Integration lab is used to determine the LOR (Light Output Ratio) and efficacy.

These light intensity distributions are used to mathematically model the lighting distribution envelope of a particular luminaire. Frenger^® conduct photometric tests in accordance with CIE 127:2007 and BS EN 13032-1 and sound engineering practice as applicable.

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