A straight-charged Thermostatic Expansion Valve (TEV) is designed to operate at an evaporator temperature of 5⁰C with a degree of superheat of 4⁰K. R134a is the refrigerant used in the refrigeration system as well as the bulb. Find: (a) The required spring pressure at the design condition; (b) Assuming the spring pressure to remain constant, find the degree of superheat, if the same TEV operates at an evaporator temperature of –15⁰C. The saturation pressure of R134a can be estimated using Antoine’

A straight-charged Thermostatic Expansion Valve (TEV) is designed to operate at an evaporator temperature of 5⁰C with a degree of superheat of 4⁰K. R134a is the refrigerant used in the refrigeration system as well as the bulb. Find: (a) The required spring pressure at the design condition; (b) Assuming the spring pressure to remain constant, find the degree of superheat, if the same TEV operates at an evaporator temperature of –15⁰C. The saturation pressure of R134a can be estimated using Antoine’

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 14RQ: The compressor amperage of a 3-ton system operating on 230 V is approximately -A.

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A straight-charged Thermostatic Expansion Valve (TEV) is designed to operate at an evaporator temperature of 6⁰C with a degree of superheat of 4⁰K. R134a is the refrigerant used in the refrigeration system as well as the bulb. Find: (a) The required spring pressure at the design condition; (b) Assuming the spring pressure to remain constant, find the degree of superheat, if the same TEV operates at an evaporator temperature of –20⁰C. The saturation pressure of R134a can be estimated using Antoine’s equation given by: Psat = exp(14.41 – (2094/(T – 33.06)), where: P is in kPa and T is in ⁰K Step by step solution please!!!
A manufacturing company is intending to use its water cooled condenser for its proposed cold storage room. The name plate of the condenser gives the following specifications: refrigerant ammonia condenser water inlet 30 OC condenser water outlet 40 ỌC condensing temperature 35 OC refrigerant flow 3.84 kg/min circulating water flow 120 kg/min If the company decided to purchase a new compressor and evaporator, find the tonnage of the system and the temperature in the evaporator, (b) what is the COP? (c) find the theoretical hp required.
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QI: An R-134a refrigeration system produces 10 ton of refrigerating effect at the evaporating temperature -10°C and the condensing temperature of 40°C.The absolute pressure measured at the inlet and outlet of evaporator are 2.0 bar and 1.7 bar, respectively. Considering there are no superheat and sub cooling effects, calculate the following parameters with or without a drop of pressure in the evaporator: (i) Refrigerating effect (ii) Mass flow rate (iii) Power requirement in kW/TR (iv) COP
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A concentrating solar collector array with 42 modules each comprising a CLFR (refer to Figure 8.11) and an absorber tube is used for raising steam under the following operating conditions:• Superheated steam condition: p1 = 100 bars, t1 = 550°C, enthalpy h1 = 3500 kJ/kg (from h,s-diagram)• Feedwater temperature is t2 = 268°C and its enthalpy is h2 = cp t2 = 4.187 × 268 = 1122 kJ/kg• Direct (beam) normal insolation (DNI) at the system location Ib,N = 833 W/m2 • Aperture area of a single CLFR module Aap = 390 m2• Efficiency of the solar collector ηc = 0.71 Calculate (i) the rate of useful heat output of the CLFR array and (ii) therate of steam production.
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