About CPTherm G-Series
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CPTherm G
CPTherm G products are aqueous low temperature heat transfer fluids with a robust corrosion inhibitor package used in general applications. CPTherm G has been formulated to operate in various low temperature thermal applications. Some of the applications include geo-thermal systems industrial manufacturing, ice rinks, and more. Table 1 provides a summary of the physical properties of CPTherm G.

TABLE 1 / Physical Properties of CPTherm™ Concentrate
Physical Property CPTherm Concentrate
Composition (% by weight) Potassium Formate & Other Additives = 50% - 60% Deionized Water = 40% - 50%
Color, Odor Clear, Colorless, Oderless
Specific Gravity 1.42 at 15.6° C
pH of Solution 10.7 - 11.5
Boiling Point >100° C
Volatiles 0,0% by Volume
Soluble in Water Soluble in all Proportions

CPTherm G is an attractive option for both direct heat and secondary loop heat transfer fluids due to the improved performance and heat transfer capacity over glycols. CPTherm G provides high efficiency compared to glycol-based fluids because of its lower operating viscosity and higher thermal conductivity. These factors enable the user to:

  • Reduce system size
  • Complete operating cycles in a shorter period of time
  • Improve overall efficiency

Existing glycol systems can easily be converted to CPTherm G with minimal/no process changes. Because CPTherm G has advantages over glycols, certain cost savings may be realized, including a decrease in system size requirements and potential decrease in energy consumption. CPTherm G is offered in a concentrated form as well as pre-diluted formulations for ease of use. The availability of the concentrate and pre-diluted formulates allow for use in systems operating from -70°F to 150°F, with burst protection down to -80°F.  See Table 2 for operating conditions and burst protection (freeze point) data.

TABLE 2 / Operating Conditions and Burst Protection of CPTherm™ G-Series
  Minimum Operating Temperature (F°) CPTherm Concentrate
CPTherm G-LT -70 -80
CPTherm G-M45 -35 -45
CPTherm G-M20 -10 -20
CPTherm G-0 10 0

How CPTherm G Operates
Heat transfer fluids circulate through a closed pipe within a system that is intended to be either heated or cooled. The circulating fluids either pull heat out of the system or add heat to the system.  The system’s design is either a direct or secondary loop setup. The following Figure 1 and Figure 2 illustrate setups for a typical system.

In a direct loop system (Figure 1), using a refrigerant as the transfer medium, the gas circulates through the whole system. This increases the inherent risk associated with use in situations where the gas is toxic (i.e.  ammonia).

FIGURE 1 / Direct, Cold Loop System

Direct Cold Loop System

In a secondary loop system (Figure 2), a primary heat transfer agent cools/heats a secondary heat transfer fluid, which then circulates through the system. This system’s design governs its efficiency (engineering and material) as well as properties of the fluids such as specific heat, thermal conductivity and viscosity. Based on the end use, heat transfer fluids may have to meet additional specific criteria.

FIGURE 2 / Secondary Loop Heat Transfer System

Secondary Loop Heat Transfer System

A secondary loop heat transfer design, using CPTherm G as a heat transfer fluid, can be used to replace conventional pressurized refrigerant with several advantages. Secondary loop systems allow the high-pressure refrigeration component such as ammonia to be centralized and isolated, which minimizes the refrigerant charge. Given the significant regulatory barriers associated with high-volume ammonia usage (due to its toxicity and flammability), CPTherm G is a cost effective and safe enabler for use in secondary loop systems.


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