When considering which type of process fluid cooling system is best for your application it is important to determine the process fluid medium, desired temperature, and the significance of operating cost versus initial investment. There are often times multiple solutions to a process cooling application and the following is intended to provide a basic outline of the types of systems available and where they are best used.
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Process cooling is moving heat from where it is not wanted (the process) and ultimately results in putting it into the air outside the manufacturing facility. Heat transfer usually involves the use of some sort of heat transfer media, usually a fluid like water or a glycol solution, to transport the heat from the process equipment to the cooling system.
The first step is to understand the temperature the process cooling fluid needs to be in order to properly remove heat from the process. This is typically specified by the process machine manufacturer and is based on the flow of fluid and the required temperatures of their heat exchangers. There are three basic types of process cooling systems to consider.
Annual Energy Use: Assumed 2,000 operating hours per year for 23 years.
Annual Energy Cost: Calculated based on an assumed electricity price of 8.6¢/kWh, which is the average electricity price at federal facilities in the United States.
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Lifetime Energy Cost: Future electricity price trends and a 3% discount rate are from the Annual Supplement to NIST Handbook 135 and NBS Special Publication 709, Energy Price Indices and Discount Factors for Life Cycle Cost Analysis ' (NISTIR 85--37 update 1).
Lifetime Energy Cost Savings: The difference between the lifetime energy cost of the less efficient model and the lifetime energy cost of the required model or best available model.
Calculated based on highest efficiency model identified in publicly provided manufacturer data as of June . More efficient models may be introduced to the market after FEMP's acquisition guidance is posted.
Calculated based on FEMP-designated efficiency requirements. Federal agencies must purchase products that meet or exceed FEMP-designated efficiency levels.
Calculated based on median efficiency of models identified in publicly provided manufacturer data as of June .
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