What They're Saying


"The following low cost measures increase the coefficient of performance (COP) of a refrigeration system by allowing the reduction of condensing temperatures:
- Desuperheat vaporized refrigerant by use of a heat exchanger or, by injecting liquid refrigerant into the hot gas discharge (enhances condenser efficiency).
- Utilize floating head pressure.
- Use refrigerant liquid pressure boost pumps to overcome line pressure loses and allow further reduction in condensing pressure."

Canadian Industry Program for Energy Conservation
Natural Resources Canada


"It is shown that 'flash gas' reduces refrigerating capacity when the condensing temperature is low. Means of overcoming the effects of flash gas by using a subcooler or a liquid booster pump have been investigated experimentally. It will be noted that activating the subcooler introduces an additional pressure drop.

"It has been found that both these methods are successful in preventing flash gas appearing at the entry to the expansion valve, but only the booster pump was successful in restoring the refrigerating capacity to the condition when flash gas was absent. It can be concluded, therefore, that the booster pump is superior to the subcooler in mitigating the effects of pressure drop in the liquid line."

Electricity Association Technology Report
Department of Mechanical Engineering
King's College, London


"After careful review, we believe that the Liquid Pressure Amplifier is based on sound engineering principles and has the potential to yield cost-effective energy savings in appropriate applications."

E Source -Tech Update #TU-93-5
Rocky Mountain Institute


"Safeway's interest in refrigeration technologies that improve the efficiency or performance of their systems led them to install a liquid pressure amplifier (LPA) at their New Westminster store. This Guide to Energy Management (GEM ) outlines the benefits of LPA technology.

"The LPA modification to the refrigeration system reduced the load on the compressors and increased the refrigeration capacity. Based on the monitored information, refrigeration capacity was increased by 8 percent and estimated annual energy use was reduced by 15 percent."

BC Hydro
Guides to Energy Management #C-839


"With respect to floating head pressure, there is no adverse effect on reliability when pressure is reduced below 90'F. In fact, reducing the condensing pressure reduces the compression ratio and generally has a positive effect on both energy consumption and life expectancy. The LPA will not conflict with Copeland Warranty."

Richard E. Turner
Copeland Corporation
Refrigeration Technical Support


"The addition of the Hy-Save pump to the systems that we are building for you will have no impact whatsoever on our standard product warranty.

It is well documented that reduced discharge pressures and the corresponding reduction of compression ratios are beneficial both in terms of system longevity as well as reduced operating costs. The addition of the Hy-Save pump to our systems should help to accomplish both of these goals."

Bob McDonough
Larkin Coils
Applied Products Division


"This is to advise that Liebert's standard warranty would not be violated when the system is equipped with a Hy-Save liquid pressure amplifier, provided the pump is installed in accordance with installation recommendations provided by Hy-Save Inc."

David F. Planitzer
Liebert Corporation
Heat Transfer Products


"Two energy saving devises were tested, ie: a liquid subcooler and the liquid pressure amplifier. Both devices improve air conditioner performance by reducing/eliminating flash gas in the liquid line. The liquid pressure amplifier (a liquid freon pump ) was found to provide better energy savings at all operating temperatures.

"We can expect savings on the order of 25% to 30% of the annual energy required to run our air conditioners fitted with the LPA pump. This will amount to $60,000 to $70,000 annually."

Jack Mandeville
Lolab Corporate Engineering
Johnson & Johnson Company


"We have not measured our energy consumption since the installation of the Hy-Save pumps. However, the increased capacity from our chiller units is expected to show about a three month payback in increased production capacity."

Bill Anderson
Merlin Plastics Supply Inc.


"Energy savings aside, the increase in capacity of my refrigeration system is really appreciated. For the first time in a long time my ice cream is hard! My compressor room is much quieter now, and we had to install a 10 minute delay on my alarm system because all the compressors are cycling off.

"Although they were initially very skeptical, you sure have converted Dave and Larry from Archer Refrigeration. They said that the way my system is operating now should give me indefinite compressor life."

Les Zaba
A&M Super Food Store


"Installation of these pumps virtually solved our refrigeration problems. The addition of a simple device in the liquid line of the system has done more then an entire service department accomplished before. Thank you for introducing us to this product. Even without the energy savings, the reduction in maintenance and downtime would justify the installation."

Harry B. Wilkinson
Technical Manager
General Mills Inc.


"I am pleased to report that we are delighted with the effectiveness of the dehumidification equipment which you installed not long ago in the Eckerd College Library. Frequent checks have shown that the humidity is almost constant at 50%, which is excellent, both for our books and for copy paper. We have found no new mold on any library volumes since you completed your installation."

Edward I. Stevens, Ph. D.
Acting Director of Library Services
Eckerd College
St. Petersburg, Florida


"Historically, (pre-pump installation), our two (2) 100 horsepower compressors operated for a total of 33 hours per day. Since the refrigerant pumps have been installed, our compressor operating time has dropped to 17-20 total hours per day. Thus, over a 33% reduction in compressor time has realized. This translated to a first post-installation electrical bill of over $4,500 as compared to the same month last year."

Andrew J. Carmichael
Director, Central Peninsula Sport Center
Soldotna, Alaska


"At present, our local power company calculates that we are saving on an average of $800.00 per month in electricity costs. Add to this the reduced wear and tear on the refrigeration system, the increase in ice making efficiency and added refrigeration capacity and reduced water treatment cost. eedless to say, the City of Albert Lea is pleased with the results."

Dawn MH Thompson
Recreation Director
Parks and Recreation Department
City of Albert Lea, Minnesota


"One thing I forgot to mention is that previously, we ran the equipment 24 hours a day. We now start the equipment 1.5 hours prior to occupancy and stop the equipment immediately after the building is unoccupied. We have eliminated 14 hours a day in run time. Due to the increase in capacity that the LPA has given this equipment in the form of lower KW per ton, we have projected that this project will pay for itself in less than 12 months."

Michael L. Lan
Assistant Foreman, HVAC Department
Marion County Public Schools
Ocala, Florida


"Two energy saving devices were tested, ie: a liquid subcooler and the liquid pressure amplifier. Both devices improve air conditioner performance by reducing/eliminating flash gas in the liquid line. The liquid pressure amplifier (a liquid freon pump) was found to provide better energy savings at all operating temperatures.

"We can expect savings on the order of 25% to 30% of the annual energy required to run our air conditioners fitted with the LPA pump. This will amount to $50,000 to $70,000 annually."

Jack Mandeville
Iolab Corporate Engineering
A Johnson & Johnson Company


"The energy consumption of each of our air conditioning systems was markedly improved by the refrigerant pumps (24%). Savings to date exceeded projections and greater savings are expected during the off-peak cooling months when lower condenser inlet air temperatures prevail. Of greater interest are the reduced evaporator leaving temperatures (evidencing increased cooling capacity). The building's indoor air conditions have been noticeably improved."

Don Fiorino
Facility Engineer
Texas Instruments Inc.


"Once installed, acting a little skeptical, I closely monitored our building from our Tracer Direct Digital Control system. The big test came on a hot, humid August day when the temperature reached 103 degrees. I was receiving 'cold calls' from tenants. I had mistakenly over lowered the discharge air temperature to ride through the hot afternoon. The interior temperature in south facing offices was sixty-one degrees (61).

"...Review of the utility bills shows a savings of over $4,000.00 during the three (3) months of cooling.

"The Trane rooftops have two (2) compressors each. Since retrofitting, the second stage seldom operates, compared to the original continuous operation."

Lou Taylor
Corporate Facilities Engineer
Brim Corporation


"With respect to floating head pressure, there is no adverse effect on reliability when pressure is reduced below 90'F. In fact, reducing the condensing pressure reduces the compression ratio and generally has a positive effect on both energy consumption and life expectancy. The LPA Will not conflict with Copeland warranty."

Richard E. Turner
Copeland Corporation
Refrigeration Technical Support


"The addition of the Hy-Save pump to the systems that we are building for you will have no impact whatsoever on our standard product warranty.

"It is well documented that reduce discharge pressure and the corresponding reduction of compression ratios are beneficial both in terms of longevity as well as reduced operating costs. The addition of the Hy-Save pump to our systems should help to accomplish both of these goals."

Bob McDonough
Larkin Coils
Applied Products Division


"A thermostatic expansion valve will operate with as little as 40 pounds pressure drop across it. If, however, the liquid temperature was at 100F, the valve's capacity would certainly suffer.

"If the liquid temperature is reduced along with the pressure drop, the valves capacity will suffer very little, provided that the valve is supplied with 100% liquid."

Jeffrey S. Warren
Sporlan Valve Company Ltd.


"We have not measured our energy consumption since the installation of the Hy-Save pumps. However, the increased capacity from our chiller units is expected to show about a three month payback in increased production capacity."

Bill Anderson
Marlin Plastics Supply Inc.


"After careful review, we believe that the Liquid Pressure Amplifier is based on sound engineering principles and has the potential to yield cost-effective energy savings in appropriate applications."

E Source-Tech Update TU-93-5
Rocky Mountain Institute


"The LRP is a simple, reliable means of converting a refrigeration system to floating-head operation, which is the efficient operation obtained by allowing the condenser to operate at lower pressure and temperature when ambient conditions permit.

"To endorse LRP is to acknowledge that one's equipment is not as efficient as it could be. Approval of LRP by component manufacturers is well documented. Since large package equipment manufacturers exercise considerable control over the flow of information, the user acceptance and application concerns we have encountered are not surprising."

Federal Technology Alert
Federal Energy Management Program
DOD, EPA, DOE # RVI 1295