A New England Food company approached Thermal Products, Scott Robinson and our partner Advantage Engineering to assist them in designing a new process cooling system to cool a new low protein food being manufactured and then packaged.
At first review the (3) process cooling loads were deemed to be in the neighborhood of 100 tons total, depending on product batch temperatures. The initial design fell well above the customers budget for this project and forced us to review other avenues.
During the site visit, Thermal Product’s Scott Robinson, noted that the incoming city water temperature was within a temperature range to handle two of the three processes and recommended using the city water to send to the existing Plate and Frame heat exchangers that were isolating the cooling water from the process food, affording Thermal Products and Advantage Engineering to offer a revised proposal to handle 80% less cooling load. This not only reduces the capital costs of the chiller, substantially, but also lowered the operating costs significantly from what was originally thought.
Scott determined the remaining third process, did require 6.5 gpm of 36°F cooling water to be supplied prompting a revised proposal for a 20 Ton Advantage Engineering Air Cooled Chiller Model OACS-20 with a close approach Plate and Frame exchanger, again to isolate a 30% Propylene Glycol and Water mixture from water heading to an existing heat exchanger with process food on the other side. Scott needed to “de-rate” the chiller to the 9.75 ton load thereby needing 20 tons. The industry design standard for chillers has been a base design of 50°F chilled water temperature @ 95°F ambient temperature. When a lower cooling temperature is required, as Scott did in this application, a higher nominal ton capacity is needed to reach 36°F. The final chiller included some of the equipment below.
• Air Cooled Condensed R407c refrigerant circuit
• Scroll compressors with hot gas bypass capacity control
• Crankcase heater for cold start-ups
• Discharge check valve
• Brazed Plate Heat Exchanger as the evaporator
• 3HP process pump
• NEMA 4 Control Cabinet
• Advantage Proprietary MI Microprocessor control instrument
• Plate and Frame Heat Exchanger, shipped loose for installation indoors
Thermal Products was able to further assist our customer’s tight delivery needs by doing a small customization of a stock chiller in order to have the chiller onsite in Massachusetts in 1 week from order.
The next step Scott says is to consider storing the approximately 10,000 gallons of elevated hot discharge water used daily by trimming those BTU’s off in one large insulated poly tank.
“I have a design in the works to recirculate and cool daily water by preventing it from costly one time use then down the drain”.
“Q3 and Q4 is the timeframe to look at this”
Please look for the follow-up article to wrap-up this application! Please contact Scott Robinson or any of the Thermal Products team to discuss your application
Scott has been with Thermal Products for over 7 years, but has more than 30 years’ experience in the HVAC and refrigeration industries, an easy shift to our line of heat transfer and related industrial products. Scott is an ASHRAE member and retains numerous state trade licenses. Scott is responsible for the New England trade areas.
Thermal Products has arrived at the Craft Brewers Conference in Washington D.C. stop by to see Scott D Robinson and the Advantage Engineering Team at booth #645!
Thermal Products Inc, will be participating at the Craft Brewers Conference (CBC) & Brew Expo America in our nation’s Capital, Washington D.C., together with our partners Advantage Engineering http://thermalproducts.com/products/chillers/advantage-engineering and Enerquip Heat Exchangers http://thermalproducts.com/products/shell-tube-heat-exchangers/enerquip
This annual event allows exhibitors and buyers to develop profitable business relationships and helps brewing and brewery restaurant professionals encounter the latest and best products and services that industry vendors have to offer.
We’ll be there to show ours!
Please visit Scott Robinson of Thermal Products and our partners at the booth locations below.
Advantage Engineering Booth #645
Enerquip Heat Exchangers Booth #2002
An Evaporative Water Tower is an energy efficient way to dissipate heat from your process. It is common for people to think a chiller is needed anytime something needs to be cooled but we should do the exercise to find out if an evaporative tower can do the job. The major question is this… Can your process be cooled by 85F water? If unsure, check with operating personnel or the equipment manufacturer of the process. If the answer is yes, then you’re on the road to an efficient way to cool your process. We say 85F, because on average summer days, a properly sized evaporative water tower can provide cooling water at 85F and even lower during cooler times of the year. A Cooling Tower Ton is 15,000 btu’s of energy vs 12,000 btu’s for a refrigerant ton, making a cooling tower more efficient. An evaporative water tower that is placed on the roof or elevated by legs and bracing provides a self-draining method into an indoor pump tank station where its water is then pumped to your processes providing year round operation. Thermal Products can work with you on the few technical pieces of data needed to size one properly.
A Chiller and it’s terminology in the industrial world denotes below ambient cooling with fluid temperatures mainly between 40F to 60F to your process. Many processes truly need these colder temperatures in which the heat removal through refrigeration is achieved. Most process applications can circulate process water through a loop in the building that is kept cool by a refrigerant chiller.
This can be accomplished by installing either an “air cooled” or “water cooled” chiller. Air cooled chillers are most popular as they are easy to install and use. Both air & water cooled chillers can be placed outdoors or indoors. If placing an air cooled chiller indoors you need to be aware of the heat being rejected into your room. Thermal Products can assist you with that calculation.
Pump Tank Stations are an integral part of an evaporative water tower including tremendous thermal storage in the chiller process as well. Water has excellent characteristics to absorb heat quickly and then let it go. Incorporated in the use of an evaporative water tower means a large sum of 85F water in a 400 to 1500 gallon tank size retains this water while one or more pumps send this water to and from your process. It returns back warmer in many cases pre designed at 10 degrees higher. The same water mixes with a dedicated pump to the evaporative water tower, heat is removed in the tower or chiller, then is returned back to the tank.
While chillers, in most cases, have a smaller reserve of water on board, a pump tank station is used for “batch cooling”. You might have a process in which you only need to cool it a few times a day or maybe once a day such as quenching of parts. In this case, large amounts of cold water and a little chiller is the answer. Calculated properly a small chiller needs to only cool a large volume of water in a pump tank station. The chiller might, for example, have 4 hrs to cool a pump tank station, bring it down to 50F and await the next process. Once again, designed properly by Thermal Products this large volume of water might only raise 15 to 20 degrees higher, achievable for a chiller of moderate size.