These parameters are normally provided by the equipment manufacturer and are a function of the surface area and the heat transfer characteristics of the process/material being cooled. It is crucial that your chiller deliver coolant at the proper flow rate and pressure. If the flow rate or pressure is too high, the equipment being cooled may be damaged; if it is too low, the heat removal will be inadequate. PolyScience can help you specify the type and size of coolant pump most suitable for your needs.
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The final factor influencing chiller/heat exchanger selection is how the heat removed will be dissipated. Chillers with air-cooled condensers exhaust heat into the surrounding air and require only power and ventilation for operation. Chillers with water-cooled condensers transfer heat to the facility's cooling water supply.
Naturally, there are other factors – such as heating capability, external temperature tracking, deionized water capability, etc. – that affect how a chiller is ultimately configured. PolyScience will take all of these into consideration when helping you select the best chiller for your particular application. Here is a summary of the information you'll need to know to ensure that the chiller you select is the best one for your application:
It is generally recommended that 20% to 50% be added to the calculated heat load to provide a safety factor if the chiller will be operated at ambient temperatures above 20°C (68°F), at high altitude, or if the heat output of the device is variable. This will also provide a margin of safety for future cooling needs. That said, resist the temptation to build more of a safety margin into your chiller than is necessary; an oversized chiller will not cool your equipment any more effectively, but will cost more to purchase and operate.
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.
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).
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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 .
Products meeting FEMP-designated efficiency requirements may not be life cycle cost-effective in certain low-use applications or in locations with very low rates for electricity or natural gas. However, for most applications, purchasers will find that energy-efficient products have the lowest life cycle cost.
Agencies may claim an exception to federal purchasing requirements through a written finding that no ENERGY STAR-qualified or FEMP-designated product is available to meet functional requirements, or that no such product is life cycle cost-effective for the specific application. Get additional information on federal product purchasing requirements.
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