supermarkets 1Supermarkets of every size are in every country in the world. They require large amounts of fresh air and cooling to keep both produce, shoppers and staff comfortable.

Supermarkets temperature problem

Large numbers of people require a great deal of cooling and this becomes a bigger issue in temperate countries that for the majority of the year have no issues delivering the cooling demanded.  This becomes an issue in hot weather when the cooling capacity of the air handling unit is dealing with the latent load. This is where the evaporator coil has to remove the water from the air being treated before cooling can be achieved.  This will greatly reduce the sensible cooling effect.  This is more noticeable over the past 5 years in the UK as we have had record temperatures with high humidity on cooling equipment that is not designed to handle this latent load. Supermarkets in the UK tend to only cool the air by up to 5.0°C below the outside ambient.  This drop in temperature is enough to make people feel cool as they walk through the door.

supermarkets 2Supermarket dehumidifiers

At Desiccant Dryair we supply standard dehumidifiers installed in series or parallel cooling equipment already installed as standard. The desiccant dehumidifier will take care of the latent load allowing the cooling plant to give cooling effect.

The dehumidifier is more efficient at this region of psychrometrics and even higher efficiencies can be gained by using waste heat for the regeneration of the desiccant wheel.

Chemical dehumidification like the desiccant we manufacture are environmentally friendly with no greenhouse gasses omitted. Supermarkets lose the most refrigerant per year than any other industry through leakage.  This is hundreds of tons of refrigerant per year.  Desiccant technologies are the fastest growing sector in the HVAC industry.

For new build supermarkets Desiccant Dryair have installed desiccant cooling units.  They come in many different combinations from full silica gel desiccant wheels, enthalpy wheels, latent cooling coils, sensible wheels, sensible cooling coils and evaporative cooling / humidification.  All components will be within a single unit and the final combination will depend on the ambient condition and the desired final condition.

Control of the desiccant cooling is a vast amount of temperature and humidity sensors.  With this the desiccant cooling will operate to incredibly high efficiencies reducing the mechanical cooling equipment size dramatically.

Desiccant Dryair have extensive experience in control engineering. Control engineers and software engineers ensure the dehumidification levels and cooling levels off sensible wheels and evaporative cooling plant are working to optimum efficiencies. All information can be transmitted via the PLC.