Vapor compression system

Vapor - compression refrigeration. Jump to navigation Jump to search. While some people have viewed this method as environmentally harmful and inefficient, the cycle is still applicable in the industrial sphere. Natural gas plants, petroleum refineries, and petrochemical plan­­­­­­­ts and most of the food and beverage processes are some of the industrial plants that utilize vapor compression refrigeration systems.

Basically, vapor -compression refrigeration employs a heat engine run backwards, so heat energy is taken from a cold reservoir and deposited into a hot reservoir.

By the Second Law of Thermodynamics, heat energy does not spontaneously transfer from a cold to a hot reservoir. Its directly driven variable-speed motor eliminates belt drives, gear transmissions and flex couplings. Bearings are cooled with air and lubricated intermittently with oil. To complete the cycle, the high pressure liquid is made to flow through an expansion valve.

To create an air cooling system , the e vapor ator acts as a refrigerant to an air heat exchanger. The air cooling system is used in buildings, automobiles, and in electronics enclosures where air cooled rack-mounted equipment is being cooled. In vapor compression cycle, no work is done by the system during the throttling process.

Since the pressure increase of the vapor also generates an increase in the condensation temperature,. Basically, vapor - compression refrigeration employs a heat engine run backwards, so heat energy is taken from a cold reservoir and deposited into a hot reservoir. Hence, the network supplied to the cycle increases further by area EDT as compared to the reversed Carnot cycle. These compressors are integral to a vapor compression refrigeration system in a supermarket.

The process of refrigeration uses the vapor - compression refrigeration cycle to move heat from one place to another. In many HVAC air conditioner and heat pump applications, the process of refrigeration or the vapor - compression cycle is what makes it work. In vapor absorption system , the liquid refrigerant leaving the evaporator does not put any bad effect on the system except to reduce the refrigerant effect. In a vapor compression system , it is desirable to superheat vapor before leaving the evaporator, so no liquid can enter the compressor. It has been and is the most widely used method for air-conditioning of large public buildings, offices.

The Refrigeration Cycle Animation in Video above describes this process. In real dollars and cents,. First, reliable, relatively inexpensive vapor compression systems can lift high heat loads at this temperature. A vapor - compression refrigeration system plays an important role in the chemical process industry (CPI) due to its capacity to cover an adequate range of heating and cooling targeted temperature by varying pressure as well as bringing process temperature to far below ambience. It is also used in domestic and commercial refrigerators, large-scale warehouses for storage of foods and meats, refrigerated trucks and railroad cars, and a host of other commercial and industrial services.

Petroleum refineries, petrochemical and chemical plant processing plants,.

Heat is absorbed from its source and rejected to a warmer exterior (typically the ambient environment). The influent is applied to the hot evaporator surface causing the water to turn to steam in the evaporator chamber. Contaminants left behind on the evaporator surface are collected as concentrate and then exit the system though a heat exchanger. This heat can be from the excess steam from the process or the hot water.

In the vapor absorption system the energy input is given in the form of the heat. While vapor - compression technologies have served heating, ventilation, and air-conditioning (HVAC) needs very effectively, and have been the dominant HVAC technology for close to 1years, the conventional refrigerants used in vapor - compression equipment contribute to global climate change when released to the atmosphere. In every distillation phase, the distillate is always at a pressure higher than the feed water thereby ensuring that in the likelihood of leakage. Lets start with some calculations.

HVAC system , such as HVAC system 10. The first practical vapor compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. The specific objectives of the lesson: This lesson discusses the most commonly used refrigeration system , i. Vapour compression refrigeration system. The following things are emphasized in detail: 1. The presentation will give you idea about the vapor compression refrigeration system. The evaporator produces the cooling or refrigerating effect.

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. These days the electric power has become very expensive, hence the running cost of the vapor compression refrigeration system is very high. VCC system mounted inside.

The ECU was designed as a sealed forced air system , where the outside airstream for the condensor was isolated from the recirculating inside air to cool the electronics components. Department of Mechanical Engineering. A refrigeration system that is used for cooling is called a refrigerator. The vapor compression cooling system layout is shown in Figure 4. For the first time the benefits of efficient, reliable, lightweight, and small vapor compression technology is being used to protect mission critical computing and communications systems. The properties of the refrigerant change as it passes through each component, and in some cases the phase of the refrigerant also changes.

The refrigerant flows continuously through the components, and completes a thermodynamic cycle each time it passes through state 1. The refrigeration cycle designed to approach the Carnot cycle in the actual system is the theoretical vapor - compression cycle. In addition, for both packaged and chiller systems, faults occur frequently in vapor - compression cycle equipment. The other unit has a heat exchanger that transfers heat between two vapor - compression cycles, i. STEP An automatic system (optional) regulates feed-water flow passing through phase. Refrigerant flows through the compressor, which raises the pressure of the refrigerant.

COMPRESSION REFRIGERATION SYSTEM. Next the refrigerant flows through the condenser, where it condenses from vapor form to liquid form, giving off heat in the process. The heat given off is what makes the condenser hot to the touch. They are characterized by drawing low pressure vapor and compressing it to higher pressure for local separation or piping to a separation facility.

The packages may include: One or two screw compressors. Since then, we’ve refined and improved the technology to deliver high-quality potable drinking water and distilled water in some of the world’s harshest environments. And since MECO has installations worldwide, you have access to a global service network that can respond quickly to emergencies and service maintenance needs. Benefits Much like heat pipes, vapor compression coolers use the high heat of vaporizations of the working liquid to remove large amounts of heat. Therefore, low mass flow rates required.

Advantage over a chilled liquid loop that requires a much higher mass flow rate. Present work deals with the improvement of vapor compression refrigeration system by using sub- cooling and diffuser at inlet of condenser. In this work, diffuser is installed at condenser inlet.