Condensers coiled

Refrigerant condenser coils of heat pump or heat reclaim systems Figure 24.1 shows the sensible heating of air. 

In the case of the evaporative condenser, the heat is input to the condenser coils, which are kept wet by the spray. The water acts both as a heat transfer medium and an evaporative coolant, and its temperature will vary through the stack of tubes. The overall process is complex and ratings are determined from practical tests on a complete condenser [16]. 

The correct and efficient operation of any plant requires full flow at all times through the heat exchangers. Air and water filters need to be kept clean. Finned coils, especially outdoor condenser coils, must be cleaned frequently. The water side of heat exchanger coils should be cleaned of any accumulations of scale or algae as soon as a change in working conditions shows that they are getting dirty. 

Some assumptions must be made regarding the condenser coil performance, and this may have a AT of 14 K between the entering air and condensing refrigerant and subcooling the liquid 5 K, with suction gas entering the compressor with 6 K superheat. 

Fig. 2.10. Freeze drying plant of the type in Fig. 2.9 (a). 1600 cm2 temperature-controlled shelf area stoppering device for vials on four shelves, valve between chamber and condenser, for BTM and DR-measure-ments, freezing is possible between the condenser coils or in the shelves if they are cooled and heated by brine from a thermostat, Tco down to -55 °C (LYOVAC GT 2, AMSCO Finn-Aqua, D-50354 Hurth). 

The visual observation of the condenser coils shows, in the visible zone, a compact solid, glassy structure. Inclusions of permanent gasses resulting in snow like surfaces were not seen. 

Fig. 2.49.4. View of a valve inside the condenser (all shelves in their lowest position). The condenser coils are seen in the background. In front to the right is a part of the CIP system. The seal of the valve can be replaced in the position shown.

To restore the efficiency of a radiator, suffering from the accumulation on noncondensables inside its condensing coils, the noncondensable gases have to be removed. The air vent shown in Fig. 13.1 serves this purpose. 

I, drying chamber 2, condenser 3, condenser coil 4, jet pump 5, heat exchanger 6, throttle valve 7, pressure controlled N2 outlet 8, LN inlet (from [2.6] page 342). 

Fig. 1.90.2. Scheme of the condenser design in plant PI 1 in Table 1.12.6. 1, Condenser wall 2, condenser coil 3, suction tube of vacuum pump 4, water drain 5, connection to drying chamber 6, valve with seal in closed position 7 valve in open position... 

NH3 pump 5, condenser coils for water vapor 6, condenser housing 7, vacuum pump 8, separation of the gaseous NH 3 from liquid NH3 9, absorption of the gaseous NH3 in the water from the expulsion 10, drying chamber 11, heat exchanger. 

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