Energy Savings

When you install KEEP COOL® glass covers, the cold air inside the chest freezer is encapsulated and isolated from the warm air in the store. Consequently, the defrosting cycle of the chest freezer is reduced by up to 87%, which allows for substantial energy savings.

Furthermore, the evaporator performance will be adjusted to a lower intensity, which improves the energy conversion efficiency, ensuring additional energy savings.


Energy conversion efficiency of an open island display

Energy Conversion Efficiency of an open island display

How it works:

The air flow cycle ensures sufficient cooling of the goods:

  1. The air passes over the goods. The entry-air is cold. With no protection against the warm air (and light) of the store, the return-air is considerably warmer than the entry-air.
  2. The return-air passes the evaporator, which re-cools the heated air.
  3. The cold air is blown forward by a fan, which ensures air flow.
  4. The cold air passes over the goods (again)



Energy balance of an open island display

Energy Balance of an open island display

How it works:

Cold entry-air assures sufficiently low return-air temperatures, despite the temperature increase (due to the effect from the warm air in the store):

 The evaporator must perform with high intensity in order to ensure sufficiently low entry-air temperatures.

 The return-air contains mixed air volumes.

 The warm air from the store contains much humidity, which creates frost in the evaporator, establishing the need for high-frequency defrosting cycles.

RESULT: high energy consumption due to the evaporator performance and high-frequency defrosting cycles.

Energy balance of a covered island display


Energy Balance of a Covered Island display

How it works:

The temperature loss from entry-sir to return-air is reduced, and the temperature of the entry-sir can thus be adjusted by 4°:

 The evaporator performance is set to a lower intensity.

 The air-flow consists of constant cold air, which contains less humidity, allowing for a decrease in the defrosting cycle by up to 87%.

RESULT: low energy consumption due to low evaporator performance and low-frequency defrosting cycles.



Download data:

Change in the defrosting cycle

Field study: Graph of the defrosting cycle before and after the installation of glass covers
Click for large image (opens in a new window)


Energy savings realized

HUSSMANN energy test (energy savings realized)
Click for large image (opens in a new window)