How PermaFrost™ works

Through applying the highly thermo-conductive compound PermaFrost™ into the refrigerant circuit, the stagnant oil layer on the inner lining of refrigerant coils is permanently removed, thereby significantly improving heat transfer. PermaFrost™ further increases thermal conductivity by accelerating the heat transfer rate of the system.

Science behind PermaFrost™

Oil accumulates in refrigerant primarily due to oil migration from the compressor. This becomes increasingly apparent on systems of 3 years and older when oil starts leaking into the refrigeration circuit at a relatively high rate. Once the oil has reached the condensing and evaporator coils, it naturally attaches to the metal tubing inner surface. After a period of time, a layer of stagnant oil will build up.

This build up of stagnant oil, particularly with the newly enhanced tubing designs, will create laminar friction inside and adversely affect heat transfer due to the poor heat conductivty of oil molecules. Excessive oil accumulation will result in a significant reduction of capacity, efficiency, and heat transfer rate, resulting in a considerable increase in energy consumption. 

As shown in the figure above, the oil molecules are attached to the tubing wall and form the stagnant layers. This barrier decelerates the heat transfer inside the refrigerant circuit and increases the energy consumption.

After the injection of PermaFrost™, the negatively-charged PermaFrost™ molecules are attracted to the inner metal tubing. These molecules dislodge the stagnant oil on the wall. Apart from expelling these poor heat conductive barriers, the heat transfer rate is accelerated and inefficient laminar flow is reduced.

Finally, after the oil barrier is completely and permanently removed and the inner metal surface is bound by PermaFrost™ molecules, the thermo-conductive PermaFrost™ molecules accelerate heat transfer inside the refrigeration circuit and reduce energy consumption.

Economic impact using PermaFrost™

The following is a brief example illustrating the economic impact of the PermaFrost product to a retail store.  The application is appropriate for many facilities. Note that this is an example based on historical averages and actual results can vary by cooling system and by geographic region. A preliminary and follow-up evaluation of each system is conducted with each installation.

A typical 150,000 sq ft retail location has an annual electricity bill of $196,000 (assumes a Florida store paying 8 cents per KWH). Of this, on average, approximately 50% or approximately $98,000 is from the HVAC system ($98,000 represents only A/C). An installation of the PermaFrost product for a location of this size would cost approximately $18,750. The resulting efficiencies, on average, conservatively result in a 15% drop in electric consumption on the A/C units, or a $14,700 savings per year. This translates to a relatively short payback period of just over 15 months.

Benefits of using PermaFrost™

Although the prior example reflects a store with a rooftop air conditioner, a similar impact on overall performance and energy savings can be applied to all rooftop air conditioners, chillers, and most refrigeration equipment. In all cases we anticipate:

How does REST evaluate the effectiveness of PermaFrostTM?

REST and the client will establish an evaluation protocol that may include several facilities with various climate and equipment variations. REST will inspect A/C or chiller systems with the client's service provider to insure that systems are in proper working order and the required maintenance has been performed prior to PermaFrost™ application. Evaluation periods are established to form a base line of performance which will record key statistics such as power input and compressor discharge temperatures. PermaFrost™ results are then measured against that baseline. The client's service provider or an agreed upon third party will record energy consumption of the system by installing industry recognized logging devices. These will be in place for the duration of the evaluation period. The energy savings calculation will be applied to the local energy costs, seasonal use adjustments, and facility configuration. The final analysis is presented to the client as an annual dollar savings.