Fact Sheet

Revolutionary and simple control device for commercial refrigeration

  • Low-cost device fits on the existing temperature sensor which controls the compressor based upon ambient air temperature
  • Endocube controls the compressor based upon product temperature
  • Fridges installed with this device see compressor starts and stops less frequently and longer compressor cycles saving electricity without compromising food safety
  • Improves efficiency of commercial fridges and freezers by between 15 and 35
  • Technology Payback – 2 to 12 months based purely on energy consumption
  • Launched in the UK and United States in 2007 – wide circulation and high customer sat-isfaction
  • Significant energy savings (reduced electricity bills and Demand Charges/Climate Change Levy Charges)
  • Considerable noise reduction
  • Reduced wear and tear on equipment,leading to extended life of equipment
  • Fewer breakdowns
  • Fewer sensor failures (as sensors are protected inside the Endocube);
  • Safer food and less product spoilage
  • Reduced environmental pollution
  • One-time retrofit product requiring no further attention or maintenance once fitted
  • Lower temperatures achieved without heat induced defrost cycles.
  • Bottom Line: Low Cost device which significantly reduces power consumption (up to 35%) and also limits wear on compressor, saving you money in the short- and long-term




How refrigeration units work:


Refrigeration units work in a series of cycles measuring the air in and around the product they cool. All units will start and stop to maintain a pre-set required storage temperature. Refrig-eration unit thermostats usually monitor circulating air temperature in order to decide when to switch on and off. Circulating air temperatures tend to rise far more quickly than food tem-peratures when fridges are opened and closed. As a result, refrigeration units work much harder than necessary to maintain stored products at the right temperature as prescribed by the thermostat. Air cycles (on/off) typically produce a minimum of 12 cycles per hour, and in some open display cases, 20 cycles per hour. This leads to excessive electricity consumption and undue wear and tear on the equipment, resulting in higher energy bills, shorter equip-ment life spans and an exaggerated impact on the environment (both through higher rates of energy consumption and the implication of disposing of refrigeration units with a shorter life-span).


Refrigeration is one of the 3 main drivers of energy consumption for many businesses. It is es-timated that twenty percent of the world’s global energy is used by refrigeration. As Time of Use (TOU) Rates continue to spiral upwards, businesses of all sizes need to find ways to save energy and money. In addition to air conditioning, the biggest challenge is to address electric-ity loads from refrigeration in grocery stores, pubs and corner stores. For each of these types of businesses, refrigeration is a major expense and a driver of summer peak load.




In early 2000, a new device called the Endocube was launched in the UK. The Endocube is an innovative device that fundamentally changes the existing theories around refrigeration.


How the Endocube works:


The Endocube dramatically changes the way a refrigerator operates because it measures the product temperature instead of the air temperature around the product. As circulating air temperature tends to rise far more quickly than food temperature, refrigerator units tend to work much harder than necessary to maintain stored products at the right temperature. When fitted to the thermostat sensor, which controls the compressor, the Endocube significantly re-duces the frequency of the refrigeration cycles as they are now based on food temperature rather than fluctuating air temperature. By using the Endocube as a cycle control mechanism, refrigeration cycles last longer but can be reduced by as much as 80%.


The Endocube consists of a non-toxic wax food simulant contained in a double-skinned enclo-sure. The food simulant mimics food temperature at around 10mm below the surface and is designed to fit quickly and easily around the fridge’s temperature sensor. With the cube fitted, the fridge responds only to the temperature of the food, and prevents fluctuating air tempera-tures from spontaneously starting the unit. It is like having your thermostat regulating fridge temperature by the temperature of the yogurt, instead of the constantly fluctuating air tem-perature. This means the compressor cycles less often than the door is open and closed, con-serving electricity. The Endocube ensures that refrigeration keeps food at the correct tem-perature while drastically limiting the temperature cycling (and resulting consumption) driven by the opening and closing of refrigerators and freezers.


For example, a Dairy Case air cycles 3 minutes on, 2 minutes off = 12 cycles per hour. With an Endocube fitted, the cycles change to 8 minutes on, 7 minutes off = 4 cycles per hour. This equates to a 66.7% reduction in starts.


As the start-up of a refrigerator compressor uses 3 times more power (i.e. 12 amps to start-up / 4 amps to run) considerable energy savings are achieved. In addition, the more efficient refrigeration cycle lease to a more efficient unit, which then leads to a colder storage area. By adjusting the thermostat back to its normal temperature settings, there are further substantial energy savings. Food safety and quality are not compromised.


When you consider more than half of the electricity in a grocery store is used to run fridges and freezers, you can imagine the impact these devices will have. The largest energy saving will be realized in the large freezers and the open chill cabinets used in the catering and super-market industries. Additional savings will accrue based on the extended lifespan of starting devices, refrigeration equipment as well as fewer break downs and service calls.


The Endocube has been rolled out in the UK with great initial success. Green King, one of the largest pub owners in the UK is installing Endocubes and will save 3.5 million pounds a year in electricity costs, about 20% for each refrigerator that the Endocube is installed in. The payback on investment will range from 2 to 12 months according to studies in the UK. Details of UK-based studies can be found in the attached Endocube energy data.


Installation is SIMPLE & EASY!


The Endocube is installed to cover the control probe(s) of a refrigeration unit, in order to pre-vent temperature fluctuations. Once installed, the fridge runs only as the product tempera-ture requires it, saving electricity and compressor wear and tear. Installation is as simple as screwing the Endocube onto the sensor.