FAQ

What is the difference between a brine-based refrigeration machine and a standard water-based refrigeration machine? Is it possible to convert existing standard refrigeration machines to work with energy storage? Does this affect efficiency?

The glycolate water refrigeration machine is larger, due to the need for a larger heat exchanger inside. This one is about 15% larger. The glycolated water refrigeration machine is otherwise absolutely the same as that of water. The only thing that changes is the size of these components and the configuration of these to be optimized to work with negative temperatures.

In addition, the loop is filled with a mixture of ethylene glycol/water that prevents freezing and allows the production of ice, which is not part of the refrigeration machine itself. It is recommended to check the percentage of glycol each year or after major interventions on the glycol loop.

Most water refrigeration machines can be converted to run at -4 degrees C on a glycol loop.

What's the difference between designing an energy storage system and a conventional chilled water system?

The loop should be filled with glycol. Icebat often requires a dedicated pump for its discharge. A plate heat exchanger is required between the glycol loop and the water loop. The regulation is also different in order to use the Icebat as much as possible. A filter is required before icebat.

Does ice storage incur additional maintenance costs?

 The specific maintenance costs for the Icebat are very low. It is simply recommended to change the durites every seven years.

In addition, as the size and number of coolers are reduced, the cost of cooling maintenance is also reduced, which lowers the overall maintenance cost of the facility over the years.

How many hours do I need to make ice cream?

The chargin time depends on the power of the glycolated water coolers and the input temperatures. The longer the charge time, the smaller the glycol cooler. Usually we need about 8 hours.

How long for a full discharge of the Icebat?

The discharge time depends on the temperature you want to reach with cold water on the consumer’s side. For air conditioning, the discharge time is also between 6-10 hours. But with hybrid storage we can unload ice storage in 30 minutes.

What are the likely risks with energy storage?

Normally, operating with an Icebat is safer than operating with a refrigeration machine because there are no moving parts inside the storage battery, which means no component wear. In addition, in case of power outage, you have the cold already available and you only need to use a pump for evacuation, instead of the entire compressor of the refrigeration machine. Icebat is thus often used as an emergency system where the need for cold is crucial.

How much energy savings can I make with energy storage? Can it lower my capital cost?

  Using the Icebat for a new installation reduces installed power by 30% to 70% depending on the cooling load profile. This saves money on electric subscriptions.

How much space do I need to set up storage?

 All our tanks are custom made. We can adapt the size of the tank (including height) of the space available for each project.
The space required for an Icebat is about 25m3/MWh.

How far do we have to go in low temperatures to make ice in a warm climate like Israel?

Outside temperature has little impact since the piping for the glycol loop will be insulated anyway.

Is the glycol clogging the tubes?

We recommend that you always install a filter before entering the pipes. But only an impurity in the fluid from an external source can be harmful.

Can the storage unit be assembled on site?

On-site assembly is possible regardless of the size of the bin and is one of our major assets.

How much energy is stored in 1 cubic meter?

Icebat stores between 10-15 TRh per cubic metre of storage while pure ice stores 25 TRh per cubic meter.

How can be sure that the glycol does not make more ice on the top than at the end of the U shape (ice-cooled ) ?

Our heat exchangers, and in particular our sensors, have been designed to ensure a uniform distribution of ice throughout the heat exchanger module. This is also possible because we load slowly, which gives the system time to be at a uniform temperature.