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Condensing units

A condensing unit is a single package that includes a compressor, condenser (air or water cooling) are mounted on a base plate or on a frame and all connecting pipes, together with the necessary wiring and control to create a set of function (Fig. 13.1). Condensing units, as a rule, include liquid receiver and ready to connect to the web site for the evaporator. Accessories such as pressure cutout switches, the liquid line, drier, sight glass and fan speed control can be included in the specification must be examined carefully. They are built in accordance with the size from less than kW exceeding 100 kW cooling capacity and may include more than one compressor. Air cooled type can have two or more fans. Sometimes capacitor separately and in this case, encoded part is called the compressor. Blocks are designed for outdoor applications have weatherproof housings and can be suitable for any wall or floor mounting (Fig. 13.2).

Capacitor corresponds to compressor cooling capacity data refer to air or water temperature at the condenser.

As compressors and condensing units do not include the evaporator, they are not complete systems and not be charged with the refrigerant, but dry nitrogen holding charge, or little refrigerant gas to maintain a slight positive pressure for transit. Suction and liquid connecting power lines and communications installed on site.

Ratings of condensing units to denote the input temperature condensing environment - air or water are traditionally presented in the form of curves (Fig. 13.3) and now more common among manufacturers of computer selection programs. Standard rating conditions condensing units are in the European Standard EN13215, 2000. Assessment of the condensing unit capacity while external conditions differ can be performed graphically, as described in Chapter 10.

Some manufacturers of air-cooled condensing units offer different sizes capacitor for each compressor, and they should be closely compared in terms of higher debt and reduce operating costs. A small capacitor, which will result in higher condensing temperatures and therefore a drop in cooling effect, since the liquid enters the expansion valve hotter, and reducing the amount of pumped due to lower volumetric efficiency. There will also increase the power of the drive motor...

 
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