Water at degrees has been subcooled by 1 degree F. If the temperature of the water is decreased to degrees, the water has been subcooled from to degrees. That is, it has been subcooled by 32 degrees. When you drink degree coffee, you are drinking a subcooled liquid! When an air conditioning system cools air, sensible heat has been removed. In fact, since the air is a gas or vapor and is heated far above its boiling saturation point, it is superheated air.
Yes, you are breathing superheated air, as the air is hundreds of degrees above the temperature at which the gases which make up air would condense back into liquid form.
Superheated does not necessarily mean hot. And, subcooled does not necessarily mean cold. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. Recalling that latent heat is the heat which is added to a liquid to cause it to change from a liquid to a gas boiling without a change in temperature, let's go to the next step.
When a gas or vapor is above its boiling point, it is said to be superheated. Cooling the gas removes its superheat. When all the superheat is removed from a gas, the gas will condense back into a liquid. The heat removed from a saturated gas to allow it to condense back into a liquid is once again latent or hidden heat and is not a sensible heat process.
That is, during the process of changing from a gas to a liquid, it occurs at a constant temperature; therefore a thermometer will not detect any temperature change. That is latent heat. Air contains water vapor or moisture.
Too much moisture humidity in air is uncomfortable. As air containing too much moisture passes over a properly designed, installed, and operating air conditioning system, the air is cooled by the air conditioning coil evaporator located at the indoor blower section. If the air containing the moisture is cooled to the condensing temperature dew point of the moisture in the air, some of the moisture will condense and deposit on the coil and fins of the cooling coil.
Since the water vapor is changing from a gas or vapor to a liquid, this is a latent heat process. The condensed water should run off the coil and be drained away. A properly operating air conditioning system both cools a sensible heat process and dehumidifies a latent heat process the air. For example, given a 3-ton residential air conditioning system, a percentage of the total capacity of the system is utilized to cool the air while the remaining percentage of the total capacity is used to dehumidify the air.
Properly controlling both the temperature sensible heat and the humidity latent heat will provide the optimum comfort for the occupants. Superheat and subcooling are both sensible heats and therefore can be measured with a thermometer.
Superheat and subcooling are also temperature differentials. That is, each is the number of degrees a gas or liquid is above or below its saturation temperature. Home Explore Login Signup. Successfully reported this slideshow. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Subcooling and superheating in refrigeration. Upcoming SlideShare. Like this presentation?
Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Next SlideShares. Download Now Download to read offline and view in fullscreen. Download Now Download Download to read offline. Subcooling and superheating in refrigeration Download Now Download Download to read offline.
Raghavender Juluri Follow. What to Upload to SlideShare. A few thoughts on work life-balance. Is vc still a thing final. In the refrigeration cycle, subcooling is an important process that ensures liquid refrigerant enters the expansion device. Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device.
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