George C. Briley has generously contributed his knowledge to IIAR throughout the years. Below is a list of the Technical Papers that George has presented at various IIAR Conferences. IIAR Members have access to these papers through the Members Only Members Only
section of the IIAR website. Just login with your username and password.
Energy Cost Comparison: Cryogenics vs. Mechanical Freezing System - 1980
Author: George C. Briley
Capital savings of increasing energy efficiency in light of rising energy costs. Comparison of cryogenics and mechanical freezing systems. Cost and facility analysis of liquid carbon dioxide vs. liquid nitrogen mechanical systems. Physical properties of liquid carbon dioxide and liquid nitrogen. The difficulty of measuring shrink or dehydration. Cost comparison of the “cost to freeze” fried onion rings and hamburger patties with liquid carbon dioxide vs. liquid nitrogen mechanical systems. Idea of incorporating a two-stage ammonia system with a combination mechanical-cryogenic liquid carbon dioxide system.
A New Concept for Freezing Cartoned Products - 1982
Author: G.C. Briley
The "VRT" (Variable Retention Time) Freezer for cartoned or packaged products is a major advance in Long Retention Freezer Design. It combines the advantages of counter flow heat exchange with Programmable Logic Control (PLC) and a simple mechanical system to provide an economical, automated approach to long retention freezing.
Lubricant (Oil) Seperation - 1984
Author: George C. Briley
Properly managing the lubricant (oil) that is normally circulating within a refrigeration system employing helical screw compressors is the key to efficient plant operation. When the lubricant (oil) quantity in the evaporator(s) becomes excessive, lots of things happen -- most all of them are bad. With the latest developments in both lubricants and separation systems, lubricant carryover can be reduced to negligible quantities with minimal capital investment.
Gazing into the Crystal Ball – 1985
George C. Briley
Some 10 years ago, in conjunction with the activities of the "R" in ASHRAE committee, I wrote an article for the ASHRAE Journal which discussed the industrial refrigeration industry including some of the rather interesting developments that had taken place over the last 10 years (1964-1974) and predicting some of the developments that would evolve during the next decade -- and become viable in the marketplace.
Hot Gas Defrost Systems for Large Evaporators in Ammonia Liquid Overfeed Systems - 1992
Author: George C. Briley, P.E. and Thomas A. Lyons
Hot gas defrost system requires detailed engineering analysis as they become larger and larger. Other types of defrost, particularly "water", should be considered where large evaporators require a short defrost interval. Familiarize yourself with the articles mentioned in the bibliography before designing a defrost system for large evaporators.
Defrosting Evaporators with Water - 1994
Author: George C. Briley, P.E. and Thomas A. Lyons, P.E.
There are a number of advantages for water defrost systems. These advantages include: The energy required for water defrost is less than for hot gas defrost. The only loads added to the refrigeration system are those required to return the coil to operating temperature and the losses to the surrounding area. This energy cost will vary with the application. Water defrost keeps coils clean except in very dirty applications (IQF Vegetable Freezers). If a refrigerant leak exists in a room where water defrost is used, stop the refrigerant flow to the unit; shut off the fans; and open the water defrost valve. The water will absorb the ammonia very rapidly. Caution: the water from the defrost may have to be diluted before it is discharged into a sewer. Water defrost, combined with hot gas defrost, can be employed where extremely rapid defrost is required.
Ammonia Absorption Refrigeration - 1996
Author: George Briley
A unique approach to combining classic ammonia absorption and a gas engine generating system to reduce energy costs in a cold storage warehouse will be discussed. But first, the classic ammonia absorption system will be described, including how it works. There are a number of advantages to using ammonia absorption systems, including: low maintenance costs, high reliability, minimal installation space, quiet, automatic control, no damage from overloads, and high efficiency and flexibility.
6000 TR Ammonia Water Chilling System - 1998
George C. Briley, P.E.
The Louisiana State Capitol building was air-conditioned in the middle 1930’s, employing 100% outside air, and the air distribution system has remained the same over all these years due to space limitations. There is no room for a return air system. There were over 20 water chilling systems in other office buildings which have been built since the 1930’s in a campus-like setting on the banks of the Mississippi River. All of the systems employ CFC and HCFC refrigerants. Each independent system employed centrifugal or screw and/or reciprocating compressors purchased from various manufacturers. Maintenance had become costly and rental equipment had to be employed from time to time due to equipment breakdown. Some years prior to this project being funded, a detailed study of the air conditioning load for each building was completed. This study, along with some planned expansions, was used in the analysis required to establish the size of the central water chilling system. The final design was based on six 1200 TR systems with one chiller being a standby. Since the planned projects were some years away, only five 1200 TR systems were installed.