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

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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