HRV HEAT EXCHANGERS

Used and installed as you would a side wall fan, the HRV is a heat exchanger system designed to reduce the required heat load in broiler houses whilst delivering minimum ventilation as required. Each unit provides 2500m3/h fresh air when running at 100% and any number of units are fitted to achieve the desired ventilation – the required number of units depends on the size of the shed and the number of birds. Smaller houses use 3 or 4 units, larger ones might use 6 or 7.

BENEFITS

85% EFFICIENT

Typical temperature lift of 17+ degrees C in winter & colder months. The warmer the incoming air, the less fuel is required to heat it.

AFFORDABLE

With typical installed costs of around £20k for a shed of 28,000 birds, the HRV is a high performance affordable heat exchanger solution and is suitable for any size shed whether new builds or existing sites.

LOW RUNNING COSTS

The main running cost is electricity usage. The electric motors run on a variable frequency drive to maximise electrical energy savings. For example, a full shed installation of 4 HRVs consumes just 2kW and 8.8A when all units are running at 100%.

The Process Explained

The HRV draws hot stale air from inside the shed and exhausts it, through a plate heat exchanger, to the outside. At the same time, fresh outside air is drawn through the same plate heat exchanger where it picks up the heat from the outgoing air.

The result is that the temperature of the incoming ventilation air is lifted by a significant factor. Independent tests have shown this temperature lift can be as much as 17 degrees C. By raising the temperature of this air without introducing moisture, it enters the shed at a lower relative humidity that the inside air. As such, moisture from the inside air is absorbed by the ‘new’ fresh air and the humidity inside the shed drops.

 

KEY FIGURES

1 %
EFFICIENT

Typical temperature lift of 17+ degrees in winter & colder months.

1
M CUBED / HR PER UNIT

Install as many units as required to achieve minimum ventilation.

1 %
FRESH AIR

All stale air is exhausted. The HRV works without air mixing.

PRINCIPLE OF OPERATION

The HRV draws hot stale air from inside the shed and exhausts it, through a plate heat exchanger, to the outside.  At the same time, fresh outside air is drawn through the same plate heat exchanger where it picks up the heat from the outgoing air.

The result is that the temperature of the incoming ventilation air is lifted by a significant factor. Independent test have shown this temperature lift can be as much as 17 degrees C. 

As it cools, moisture condenses out of the stale air and drains from the HRV casing (this water may or may not need to be collected). By raising the temperature of this air without introducing moisture, it enters the shed at a lower relative humidity that the inside air. As such, moisture from the inside air is absorbed by the ‘new’ fresh air and the humidity inside the shed drops.

FAQ

In a broiler house, tests show the HRV’s efficiency can be as high as 85%. This means that outside fresh air is being brought into the shed at approx 85% of the internal temperature rather than the colder ambient outdoor temperature.

The warmer the incoming air, the less fuel required to heat it.

In an average sized broiler house, typically 5 or 6 units will deliver good results. The max. output from a single unit is 2500m3 so the number needed depends on the number of birds and their minimum vent requirements.

They are controlled via a 0-10V signal that varies according to the birds weight curve. This delivers as much fresh air as the birds need, avoids over venting and delivers maximum efficiency. Most modern house computers have this facility but we can supply controllers to provide this signal if required

Cleaning is quick, easy and thorough. The heat exchange block can easily be removed for cleaning / disinfection and the case can be pressure washed.

Lowering the house relative humidity is a consequence of introducing warm dry air into the shed. Moisture is removed from the air as it is exhausted from the HRV.

No. All air entering the shed through the HRV is 100% fresh.

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