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The HXs are capable of providing a NEMA 4X and IP66 level of ingress protection for expensive electronics within the cabinets from the harmful elements that often exist in a pipeline environment.
Some of the most efficient VFDs in the market convert 6-7% of the input horsepower to heat--a sizable percentage that HXs are designed to dissipate.
One way to enhance heat transfer in compact HXs is to utilize evaporative cooling where a thin water film is applied over HX fins.
Table 1 presents an overview of experimental studies on evaporative cooling of HXs. Although limited in number, published experimental studies have established that evaporative cooling could significantly enhance heat transfer capacity of fin-tube HXs and could enhance power plant efficiency, refrigeration cycle coefficient of performance (COP).
Sunden (2007) categorized the use of CFD in HX simulation to be either for flow distribution upstream of HXs using coarse mesh or heat transfer and skin friction prediction of periodic modules within the HX using fine computational meshes (Li et al.
One of the earliest approximation-assisted optimization studies in HXs (Lee et al.
The cabinet cooling HXs are capable of cooling 20 kW each, so there is a good correspondence between the 5637 kW of ITE plus mechanical load and the 20 x 300 = 6000 kW cooling capacity of the cabinet coolers.
It also allows for the chillers to be bypassed when not in use, allowing for optimal quantities of each of the three main chilled-water plant components (pumps, HXs, chillers) to be selected for each of the three main operating conditions (full mechanical cooling, integrated economizer mode, and full water-side economizer).
In the first optimization study, the fin materials on both indoor and outdoor HXs are minimized in order to reduce the initial equipment cost and compressor capacity is modulated to meet the required performance targets.
In the second optimization study, the fin materials on both indoor and outdoor HXs are kept constant at the optimum values obtained from the initial optimization study however the compressor capacity and outdoor HX fan speed are allowed to change to reach maximum COP at the cold ambient conditions of -26.1 [degrees] C (-15 [degrees] F).
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