What is pH diagram of refrigeration cycle?
A p-h diagram is a figure with a vertical axis of absolute pressure and a horizontal axis of specific enthalpy. It is an important diagram used frequently for a performance calculation of a refrigerating machine.
What is ideal refrigeration cycle?
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space.
What is pH diagram of Vapour compression cycle?
The P-H and T-S diagram for the simple vapor compression refrigeration cycle is shown in the figure for vapour entering the compressor is in dry saturation condition The dry and saturated vapour entering the compressor at point 1 that vapour compresses isentropic ally from point 1 to 2 which increases the pressure from …
What are the desirable properties of an ideal refrigerant?
Physical Properties of Refrigerants
- Low Freezing Point. Refrigerants should have low freezing point than the normal operating conditions.
- Low Condensing Pressure.
- High Evaporator Pressure.
- High Critical Pressure.
- High Vapor Density.
- High Dielectric strength.
- High Latent Heat of Vaporization.
- High Heat Transfer Coefficient.
Which chart is most useful in refrigeration?
Pressure-enthalpy chart is useful in refrigeration.
How does the ideal gas refrigeration cycle differ from the Carnot refrigeration cycle?
In the ideal gas refrigeration cycle, the heat absorption and the heat rejection processes occur at constant pressure where as in Carnot refrigeration cycle the heat absorption and the heat rejection processes occur at constant temperature.
What is the desirable characteristics of refrigerant?
The desirable properties of a refrigerant are as follows: High latent heat of vaporization to get more refrigeration effect. Large conductivity to reduce size of condenser and evaporator. Low specific volume of vapour. Low freezing point such that there is no blockage during flow through evaporator.
What is refrigerant critical temperature?
The critical temperature of a refrigerant is the temperature above which a refrigerant gas (vapour) cannot be liquefied, irrespective of pressure. This process normally takes place in the condenser. The refrigeration compressor pumps hot gas (vapour) into the condenser coil.
What is COP in refrigeration system?
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.
How do you use a PH diagram?
On the P-H diagram, pressure is indicated on the y-axis and enthalpy is indicated on the x-axis. Typically enthalpy is in units of Btu/lb and pressure is in units of pounds per square inch (psi). The upside down U figure shown on the diagram designates the points at which the refrigerant changes phase.
How is the refrigeration cycle represented in a P H diagram?
Usually one tends to pick pl as low as possible but not below atmospheric pressure. Saturation curve this curve represents what state vapor or liquid and region sub cooled latent heat and superheat the refrigerant is in. The refrigeration cycles can also be represented in a p h diagram.
What makes a refrigerant different from an ideal cycle?
Most of the differences between the ideal and the actual cycles are because of the irreversibilities in various components which are: 1-In practice, the refrigerant enters the compressor at state 1, slightly superheated vapor, instead of saturated vapor in the ideal cycle.
How does the vapor-compression cycle work in refrigeration?
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space. The ideal vapor-compression cycle consists of four processes.
What are the four components of a refrigeration cycle?
The Vapor-Compression Refrigeration Cycle The vapor-compression refrigeration cycle has four components: evaporator, compressor, condenser, and expansion (or throttle) valve. The most widely used refrigeration cycle is the vapor-compression refrigeration cycle.