Cavitation and Valve Selection Considerations By TK NG Valves are generally used for flow or pressure control of fluid. In Fig 1, the amount of fluid flows through the valve can be controlled by varying the plug to seat clearance (i.e. the flow passage) at the valve port. …
Insulation Practices for Gas and Liquid Refrigerant Pipes of Split Type Air Conditioners By TK NG CorrigendumTypos found in the earlier version of this article have been corrected in dark green. Do you know the gas and liquid refrigerant pipes between the indoor and outdoor …
Separating A Noise Source from the Background Noise By TK NG When measuring the noise levels at different octave bands of an operating machine such as air-cooled chiller on site, what you can get are the combined sound pressure levels of the machine and the surrounding background. To …
Discharge Ductworks Arrangement for Air Cooled Condenser with Fan Cycling Control By TK NG Air cooled condensers of air-conditioning/refrigeration systems installed in the vicinity of inhabited areas are usually provided with acoustic treatment to minimize the noise nuisance generated. For air cooled condensers equipped with fan cycling control …
Floating Neutral in Building with 3-phase Power Supply and 1-phase Loads By TK NG 3-phase supply is usually provided in a building where power demand is high. There may be both 1-phase and 3-phase loads connected to the power supply. Figure 1 below shows a typical connection arrangement. …
Pressure Withstanding Capacity of Copper Piping System By TK NG When designing a fluid conveying piping system, one key consideration is the working pressure of the fluid which the system will have to handle. For a high-rise building, the fluid working pressure can change considerably from one location …
Oil Free Magnetic Bearing Chiller – Energy Advantage By TK NG Oil free magnetic bearing chiller (oil free chiller in short) is a highly energy efficient piece of air conditioning equipment, which is characterized by a partial load COP (Coefficient of Performance) higher than that at full load. …
Minimizing Trip-over at Lift Landing By TK NG For lift arriving at a landing, automatic re-levelling of the lift car is required if difference in the levels of the car door sill and landing sill exceeds a certain limit as required by local code. The re-levelling is effected …
The Benefit of More Flat Steps at Escalator Landing By TK NG Whenever you step onto the landing of an escalator, what you need to do is to grasp the moving handrail and make sure your feet do not straddle two adjoining flat steps. This is to prevent …
Water Hammer not due to Closing of Valve By TK NG Water hammer is experienced when water in motion is forced to stop abruptly, such as closing of a valve at the end of a pipeline. However, there are cases where the cause of water hammer is due …