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Why don't we use the rejected heat by a condenser in refrigerator?
Although I doubt there is a definitive answer to this question, since many factors, mostly economical, take into account, but to make a product that harnesses the rejected heat would be quite difficult. Different refrigerators produce varying amounts of heat, dimensions can vary greatly, and space constraints limit the market greatly. In addition, current methods of converting free heat into energy are very inefficient. At the most, you might be able to use it as a hand warmer.
How do you higher the thermal efficiency of a cycle?
To increase the thermal efficiency of a cycle, you can: increase the temperature at which heat is added, decrease the temperature at which heat is rejected, and reduce internal irreversibilities and losses in the system. This can be achieved by optimizing the design, improving insulation, and using more efficient components.
Why is there heat rejection in a thermodynamic process?
In a practical heat engine, heat is generated by burning a fuel, work is extracted from this heat resulting in the working fluid cooling, and heat is then rejected at the lower temperature. As you must know, in an internal combustion engine heat is rejected both in the engine cooling system and the exhaust. In a power plant, using water/steam as the working fluid in a closed cycle, there are four phases in the cycle: 1. Water is pumped at high pressure into a steam raising unit (boiler) 2. Heat from the fuel, be it coal, oil, gas, or nuclear, is added to the water causing it to become steam 3. the steam is expanded through a turbine doing work, that is driving the generator 4. the steam is condensed back to water using external cooling water. This is called the Rankine cycle. At stage 4 heat is being rejected into the external cooling water, and this heat is lost. It is minimised by running the condenser under vacuum so that steam at less than 100 celsius can still do work, and the final turbine discharge temperature is as low as 30C. Theoretically the efficiency of such a cycle is maximised by making the steam to the turbine as hot as material constraints allows, and the condenser vacuum as low as the local cooling water temperature will allow. The maximum practical efficiency of such a plant is about 42 percent, meaning that 58 percent of the heat from the fuel is rejected. For a PWR nuclear plant the steam temperature is much lower and the cycle efficiency is less, more like 30 percent. I hope this enables you to see why in a practical heat engine there must be heat rejection. There are several entries in Wikipedia for further reading, see 'Heat Engines' first.
Thermal efficiency of nuclear power plant?
The average thermal efficiency of a nuclear power plant, which accounts the heat produced in the reactor and the electricity produced in the turbo generator, is about 33-34%, varying on the type of the reactor as well as which fluid is used to cool the reactor and transfer the heat.
What college was Albert Eistein rejected?
Albert Einstein was rejected by the Zurich Polytechnic School. Despite being rejected by this school, he went on to attend the University of Zurich and eventually obtained his doctorate in physics from the University of Zurich.
When a heat pump is in the cooling mode the heat is rejected through the Outdoor Fan or The Condenser Coil or The Evaporator Coil?
Condenser coil
What happens to the efficiency of a heat engine when the temperature of the reservoir into which heat energy is rejected is lower?
The efficiency of a heat engine increases when the temperature of the reservoir into which heat energy is rejected is lower. This is because a lower temperature of the sink allows for a greater temperature difference between the hot and cold reservoirs, which leads to a higher efficiency according to the Carnot efficiency formula.
Why are you using condenser in rankine cycle?
The condenser is used to lower the temperature of the working fluid. This lowers the pressure and condensates any left over steam, from the turbine, so it will be purely liquid before entering the pump.
What is a refrigeration condenser?
found on the high side of the system ( meaning high pressure side ) it acts in the same way the radiator in your car does, its job is to dispel the heat energy from the refrigeration system by way of heat transfer over the coils surface -there are many different types of coils but they all do the exact same thing. on a more technical level -----super heated vapour is forced into the top of the condensing coil circuit after it has been compressed by the heat pump ( the compressor ) creating a high pressure, ......so as the heat escapes from the condenser the refrigerant reaches a stage known as sub cooling , the gas is reaching its saturated discharge temperature ( the point at which no more temperature can be rejected from the gas / system ) and so this high pressure allows the vapour to change to a liquid by the time it is pushed out of the bottom of the condensing coil.
Why don't we use the rejected heat by a condenser in refrigerator?
Although I doubt there is a definitive answer to this question, since many factors, mostly economical, take into account, but to make a product that harnesses the rejected heat would be quite difficult. Different refrigerators produce varying amounts of heat, dimensions can vary greatly, and space constraints limit the market greatly. In addition, current methods of converting free heat into energy are very inefficient. At the most, you might be able to use it as a hand warmer.
What rhymes with dejected?
Words that rhyme with dejection: * injection * infection * detection* rejection*selection
What is the component of a refrigeration system which changes a high pressure vapor to a high pressure liquid?
A brief discussion of the operating vapor-compression cycle is helpful to indicate other potential refrigeration problems in real systems. In the basic cycle, slightly subcooled refrigerant leaves the condenser at high pressure and flows into the liquid receiver if one is present. The refrigerant then enters the throttling device (capillary tube, TXV, etc.) where the pressure is dropped. It then enters the evaporator as a two-phase mixture (liquid and vapor) and evaporates or boils at low temperature, adsorbing heat. Slightly superheated refrigerant vapor exits the evaporator and enters the suction line accumulator, if one is present (used to trap any transient liquid slugs). The refrigerant vapor then enters the compressor where the pressure and temperature are increased as the compressor compresses the refrigerant vapor. The vapor leaving the compressor is superheated, and the compressor discharge is the hottest point in the cycle. This refrigerant is cooled and condensed in the condenser where heat is rejected, and the refrigerant is condensed to liquid. Refrigerant actually leaves the condenser slightly subcooled (subcooled liquid) to assure condensation has been complete. Any non-condensable vapors in the system will be unable to condense in the condenser and will appear as gas bubbles in the condensed liquid stream. These non-condensables may collect in the condenser and displace refrigerant from the condenser heat exchanger, thereby reducing the effective surface area of the condenser.The compressor changes the low pressure vapor to high pressure vapor sending it threw the condenser to cool and turn it back into liquid.
How do you higher the thermal efficiency of a cycle?
To increase the thermal efficiency of a cycle, you can: increase the temperature at which heat is added, decrease the temperature at which heat is rejected, and reduce internal irreversibilities and losses in the system. This can be achieved by optimizing the design, improving insulation, and using more efficient components.
When was Answers.com rejected?
it was not rejected.
What are some lyrics for a global warming song?
CO2 - Boo-Hoo for You; Oceans Neglected are Oceans Rejected; CO2 - We need You less and less; release Us from Your Loss Projected; Methane ... You only contribute to how Our Loss will be Affected; People ... You only contribute to how Our Losses will be Affected and Effected.
When was Rejected created?
Rejected was created in 2000.
How do I say rejected in British?
Rejected has the same spelling in British English. For example, I rejected the job offer.
