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. Explain how the expansion valve in the refrigeration system works?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 22RQ: Variable refrigerant flow systems sense the ______and _____of the refrigerant to determine the...

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Question

1. Explain how the expansion valve in the refrigeration system works?
2. Explain the mechanism of the capillary tube that is usedas an expansion valve?
3. Describe the cascade refrigeration system?
4 .Prove whether the cascade refrigeration system can increase the refrigeration COP?

Materi:thermodynamics

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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saturated liquid from condenser Pcond = 900 kPa mcond =0.05 kg/s mcomp refrigerant to compressor ank- 500 kPa 3 rim mup Başka yönergeler almak için tıklayın Figure illustrates a vapor separator that is part of a refrigeration system. Saturated liquid R134a leaves the condenser at State 1 with a mass flow rate of 0.05 kg/s and pressure of 900 kPa. This refrigerant enters the vapor separator (a large, insulated tank) through a valve. The pressure in the tank is 500 kPa. There is no pressure drop due to flow through the tank (i.e., the pressure at States 2, 3, and 5 are all the same). The flow at State 2 is two-phase. The liquid portion of this flow falls to the bottom of the tank due to gravity while the vapor portion remains at the top. The saturated liquid is drawn from the bottom of the tank (at State 3). The saturated vapor is drawn off of the top of the tank at State 5 and fed to a compressor. Assume that the vapor separator is adiabatic, rigid, and operating at steady state. a) The…
Analysis of the Refrigeration System Cooling effect: Q = (h1 – h4) Compressor work: Win = (h2 – h1) Condenser load: Qn = (h2 – h3) QL (h1-h4 Theoretical COP: COPref = Win Qh. (h2-h3 COPhp = W in Win Assuming total cooling capacity is : Q Mass flow rate of refrigerant in circulation: m = h1-h4 Compressor power: Þ = m(h2 – h,) = (h2-h;) (h1-h4) Condenser capacity:: Q. = m(h, – hạ) = 0 h3-12) (h1-h4) Example 2 A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 C and condenses at 35 C, with the 5 K of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determine the following; a) The refrigeration effect b) The mass flow rate of refrigerant c) The compressor power d) The rate of heat rejection at the condenser e) The COP The corresponding Carnot COP f) g) The percentage Carnot efficiency Example 2 A plant…