A HEALTHY PUMP STATION
Regardless of ourdoor temperature
Many pump stations are kept warmed up today, at about 15 ° – 20 ° C, all year around using electricity. Often a municipality has a large number of pump stations. This opens up for energy gains to be made if it would be possible to safely lowering the temperature in the pump stations.
However, if the heat is turned off, the temperature will drop inside the superstructure. When the temperature drops, the relative humidity increases, which can cause problems with corrosion, mold and odor. In order to lower the temperature in the pump stations, the relative humidity needs to be held under control. Airwategreen dehumidifiers are built with a technology that allows them to dehumidify the air regardless of the temperature. This makes the technology suitable for low temperatures and for protection against moisture-related problems.
As an example lowering of the temperature in 100 pump stations in a municipality enables energy savings of about 260 MWh per year. This corresponds to an emission reduction of carbon dioxide of about 23.4 tonnes per year.
CHALLENGES IN PUMP STATIONS RELATED TO HUMIDITY
Corrosion is an electrochemical reaction to metals exposed to corrosive gases and / or high relative humidity. This can lead to high maintenance costs and reduced service life on key components. Hydrogen sulphide emitted from the sump is an example of a common corrosive gas in pump stations.
Corrosion in pump stations typically depends on:
- High relative humidity
- Hydrogen from the sump
Odor comes from the swamp and penetrates the superstructure. This affects the working environment and the nearby neighborhoods may complain.
Examples of gases that emit odor are:
The amount of hydrogen sulphide present in the air in a pump station can affect the health of those who work with pump stations. The health effects are related to the concentration of hydrogen sulphide in the air. To work for 8 hours, the work environment guidelines says that the level should be kept at 5 ppm hydrogen sulphide in the air.
Health Effects Hydrogen Hydrogen:
- Sore throat
- Physical collapse
- Difficulty breathing
A carbon filter can adsorb gases that cause corrosion and odor problems such as hydrogen sulphide, ammonia and mercaptans. However, activated charcoal adsorbs also the water vapor contained in the air if the relative humidity exceeds 70%. The water vapor in the air causes the pores in the carbon to clog and the active carbon loses its ability to trap the harmful gases. This causes the coal to be replaced irregularly and results in high maintenance costs and uncertain operation.
The following calculation is based on a candidate’s work from Uppsala University. Here, the energy consumption in a small pump station was measured in two cases. The pump station has a floor area of approximately 5.8 m2.
In the first case, an element was allowed to hold 18 ° C in the pump station and the relative humidity varies freely.
In the second case, a condensing dehumidifier, FLEX Integrate, kept a RH of 50% and the temperature allowed to vary freely over 5 ° C.
The figure below shows the values of the energy consumption of a pumpstation housing with temperature data in 2015. The blue line shows the pump housing values with an element that maintains the temperature of 18C. The red line shows the values for the power consumption of a condensing dehumidifier. The result shows that with a condensing dehumidifier, the energy consumption for one year is 513.8 kWh and with an element 3101.57 kWh. The energy consumption of a condensing dehumidifier is used instead of the elements being 83.0% lower.
The red line shows the lower energy consumption when a dehumidifier keeps the same climate
The figure above shows the power consumption of a pump station where the relative humidity level is checked for a full year. The blue line shows the energy need when heating with an element, and the red line shows the energy requirement when using a condensing dehumidifier to control the climate and maintain relative humidity at a stable level. As shown in the figure, our dehumidifier needs a fraction of what an electrical element requires.
To handle the challenges associated with moisture in the pump stations, the following setup is used. A carbon filter sucks air directly from the sump. This creates a negative pressure in the sump. Dry air from the superstructure penetrates into the swamp and mixes with the harmful gases. The mixed air is led through the carbon filter. In the superstructure, a wall mounted condensing dehumidifier holds the right climate. The dehumidifier controls relative humidity, but also avoids frost and icing through a built-in frost guard.
Our dehumidifier adapted for pump stations is called FLEX and has a capacity of 5 liters of water / day, which is usually more than enough.
The package includes:
- Dehumidifier FLEX Smart or FLEX Integrate
- Wall mount
- Service agreement
- Odorless climate:
Carbon filter – added
Do not hesitate to contact us for a climate investigation to define the moisture levels and to design a suitable solution for your business!