Suction and Condensing Temperature Effects

As discussed in Chapter 33, suction and condensing temperatures are critical factors that affect compressor capacity and system performance. As suction temperature is increased, the mass flow through the compressor increases because the specific volume decreases and, at constant condensing pressure, the compressor's volumetric efficiency increases. Thus, at constant condensing temperature, as the evaporator temperature increases, both compressor capacity and power requirements increase. However, the power requirement increases at a lower rate due to the lower pressure ratio that the compressor must develop. Figure 37-17 shows the variation of capacity and power requirements as a function of suction temperature for a reciprocating compressor. Notice that the refrigerating capacity increases rapidly as the evaporator temperature increases. In this example, the brake power of the compressor reaches a maximum when the evaporator temperature is 36°F (2°C) and decreases if the evaporator fc

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

Get My Free Ebook


Post a comment