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8/7/2019 PowerCubeTechnicals

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Lowering Your Refrigeration Costs

Protocol:

Numerous trials have been conducted to verify

energy savings that can be achieved by installing a

POWERCUBE to the air sensors monitoring

temperature inside refrigeration units.

Each trial ran for a period of two weeks. During

the first week of each trial, the refrigeration unit was

controlling temperature as normal, based upon air

temperature. Data loggers were installed on the

refrigeration units, capturing benchmark data of

kilowatt-hours (kWh) used and the number of

compressor start/stop cycles. Then, aPOWERCUBEwas installed on the air sensors and the same data

was captured for the second week.

For each trial period, the temperature of the food,

the food simulant itself (POWERCUBE), and

circulating air in each refrigeration unit were

measured to ensure that there was significant change

in total number of kilowatts consumed as well as a

reduction in compressor start/stop cycles, all while

maintaining food at a constant temperature andensuring food safety.

Results In Each Case:

1. Food temperature remained within food safety

guidelines after the POWERCUBEwas installed

2. The POWERCUBE food simulant provided

temperature readings equivalent to that of the

food.

3. Energy savings between 13% and 33% were

observed.

Conclusion:

Installing a POWERCUBE will reduce the

electricity consumption of most commercia

refrigeration units by up to 33% without changing

the storage temperature of the food, and always

ensuring food safety.

The following data reports highlight trials with major companies, who use commercial refrigeration in theirdaily businesses. These trials were conducted in a variety of time durations from two to fourteen days. In all

cases, significant savings were experienced in energy consumption after the POWERCUBE was installed.

2011 Senergy Solar Cor

Verification Of The Technology

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Thermal inertia is a term we seldomif ever hear about. Yet, thermalinertia is constantly operating in the

background of our lives everywhere,but especially so with regard to

refrigeration.

Thermal Inertia simply refers to

the tenancy of something to remain at

its current temperature. Since food is

denser than air, it has greater thermal

inertia than air and is affected much

less by external forces of change.

Air temperature can go up and

down like a yo yo, while food

temperature, comparatively, will

change very slowly. Therefore, when

refrigerated air is circulated around

food, it has a somewhat modest effect

on the food, even though the air itself

is much colder.

So, as the thermostat senses lots of

changes in air temperature, it signals

for lots of on/off cycling of the

compressor. This truly is a tail

wagging the dog scenario. In fact, if

the thermostat were to monitor the

food instead of the air, it would signal

far fewer on/off cycles and provide

true, more substantive cooling of food

with the enhancement of longer on/off

cycle times.

Longer on-cycles have a more

positive effect on food because they

allow the denser-than-air food to

2011 Senergy Solar Cor

The Importance Of Thermal Inertiaabsorb meaningfultemperature changeAnd once the cooling change has been

retained by the food, its thermal inertia

gives it the ability to remain relativelytemperature constant. This provides for

longer off-cycles.

So, when thermostats measure foodtemperature and not air temperaturethe cycles are longer and more relevan

in terms of effective results. Therefore

its no coincidence that total run-time is

greatly reduced, because the system is

now food-monitoring and is operatingmuch more efficiently.

All of this translates into lower

energy costs with a bonus of extended

equipment life span.

Case Study

These two 12-hour graphs showthe frequency and duration of on/offcycles before and after installation.POWERCUBE enables longer and

fewer run times, which have thepositive effect of generating a netcolder food temperature with lessenergy. This means the set point ofthe thermostat can actually be raised while thedesired, optimal, safe food temperature is stillmaintained. Energy savings result from the higherset-point setting, overall reduced run-times, andreduced cycle frequency.

Test and monitoring were conducted on amedium-sized walk-in over five days. The savingsspreadsheet shown at the right reveals the results,

which were averaged as one 24-hour period forsimplification purposes.

Power-consuming compressor starts arereduced by 66%, a dramatic factor that increases thelife of the compressor. This reduction percentage isapplied as an extension to the compressor lifetimeand is added in with the energy savings, which,together, provide a more realistic ROI.

For more information, please contact:Senergy Solar Corp

610-609-0278



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Independent 3rd Party Testing and Certification

Founded in 1944, NSF International (National Safety

Foundation International) is a World HealthOrganization Collaborating Center. (http://www.nsf.org)

It provides public health and safety risk management

solutions to companies and governments around the

world. As an independent, not-for-profit organization,

NSF is committed to public health and safety protection by

certifying products and by writing standards for food, water,air, and consumer goods. Most importantly, NSF

Certification of a particular product is not a one-time

activity. Their certification program requires regular on-site

inspections of the products manufacturing facilities.

Making Sure The Product Performs Properly And Safely

With its testing, analysis, and certification of

POWERCUBE , NSF has determined the following:POWERCUBE is a temperature mimicking

sensor, tested under Protocol P235 by NSFInternational. It is designed for placement intorefrigeration containing dairy, meat, ready meals, andother food products meant to be maintained at or

below 41F. POWERCUBE is designed to accurately

reflect the temperature of food under refrigerationconditions and warm more quickly than food products

upon equipment failure.A temperature mimicking sensor is a separate,

non-invasive device consisting of a food simulantmaterial with a thermocouple or thermistor attached.

A product that is certified means that NSF has:

Reviewed the product, most often through actual sampling

Determined at the time of the review that the product complies with relevant NSF SafetyStandards

Has conducted and will conduct future periodic audits of the manufacturing plant(s) to review

that the product continues to comply with current Safety StandardsAfter NSF grants certification, it authorizes the manufacturer of the product to use the NSF Mark

on it or in connection with its sale, use, and distribution. The NSF Mark conveys

that an independent, third-party organization has tested and determined that

the product complies with the relevant standard.

Certification Technical Details

Under the performance requirements of Protocol P235, POWERCUBE passed the following tests:

The temperature indicated by POWERCUBE is between 2 degrees Fahrenheit of the refrigerated foodproducts 15 mm (0.59 inches) below the surface during the normal refrigeration operations test. The purpose

of the test is to insure that POWERCUBE accurately mimics the food product temperatures. The temperature indicated by POWERCUBE is no more than -2 degrees Fahrenheit lower and no more than

+5 degrees Fahrenheit higher than the refrigerated food products during the warm-up test, which imitates arefrigeration failure. The purpose of the test is for POWERCUBE to indicate a higher temperature than thefood products to provide advanced warning and allow the user to take remedial actions.

POWERCUBE carries the NSF logo for Protocol P235. Under Protocol P235, POWERCUBE is also requiredto adhere to standards ANSI/NSF 2 for Food Equipment Requirements for Design & Construction. Both ofthese standards insure that the POWERCUBEs design is easily cleanable and the materials used are notharmful when operated in the refrigeration environment.

Certification Overview

Analysis Overview

610-609-0278 2011 Senergy Solar Corp


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