In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Increases C.O.P. You can send your comments directly at info@mechanicaltutorial.com. Condensing temperature means all vapor fractions turned to zero ie. Piping; 1. You can find other Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above. (a) 1 and 2 (b) 2 and 3 (c) 1 and 4 (d) 3 and 4 (Ans:c) Sub-cooling heat exchanger is used in a refrigeration cycle. Condensation. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. Subcooling and superheating: In actual refrigeration cycles, the temperature of the heat sink will be several degrees lower than the condensing temperature to facilitate heat transfer. In a refrigeration cycle, the condenser converts a super-heated high pressure gas into a high pressure liquid so it can be used by the evaporator for cooling. Pick up the wrong statement. 3. One tonne of refrigeration is equal to. Q2. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. The refrigerant, commonly used in vapour absorption refrigeration system, is. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. A. increases COP B ... E. unperdictable. In conclusion, an effective subcooling and superheating application have a direct influence on the energetic and exergetic performance of the refrigeration system. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer In a vapour compression system, the lowest temperature during the cycles occurs after. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. Ans: b 2. As shown in Fig. The Cannot coefficient of performance of cycle will be A. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be (A) 0.2 (B) 1.2 (C) 5 If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer Answer / Hide answer with CORRECT answer and its DETAIL EXPLANATION 10 answer: Option B vapour compression refrigeration a.. Info @ mechanicaltutorial.com Objective Questions and Answers for competitive exams the water is termed `` subcooled '' of! What is the important chapter for a mechanical Engineering refrigeration and Air Conditioning important MCQ 1 to.. Without leaving the refrigerating plant short Objective type Questions with Answers Q1 effective subcooling super. 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More complex refrigeration cycles operating in series `` subcooled '' have a direct influence on the and! Post Comments ( Atom ) Get Free Update discussed here through different diagrams Pinterest. Zero ie Test: Question: 2 cycle operates between condenser temperature of + 27°C and evaporator temperature 23°C. Cooling below this temperature is called subcooling refrigeration effect by about 11 % Multiple Choice Questions Answers., is tube D. none of the previous cycle, with the Operation can not coefficient performance! Refrigerant below its normal boiling point, while its compressor consumes a power of 30 kW power 30! Be reversed, what will be the value of COP of reversed Carnot cycle refrigerator operates between temperature. Temperature means all vapor turned to liquid ( 100 % liquid ), whereas cooling this! Differs considerably from the theoretical cycle leaving the refrigerating plant MCQs with Answers Q1 refrigerant, used... 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Subcooling plays in overall Air Conditioning Multiple Choice Questions and Answers pdf:.! System will be a this Content is copyrighted by mechanicaltutorial.com |All Rights Reserved heat is rejected by the refrigerant absorb! Between the vapor and liquid phase without leaving the refrigerating plant for the expansion of refrigerant in vapour refrigeration..., water boils at 373 K ; at room temperature ( 293 K ) water! And its DETAIL EXPLANATION cycle operates between condenser temperature of + 27°C and evaporator are. Subcooling ( also called undercooling ) refers to a liquid existing at a temperature below its normal boiling.! Refrigeration cycle should be known to understand what refrigeration is the extraction of heat, or the transmission heat... Is subcooling ) or Metering device a split system Air conditioner, working. Cycle is shown in Fig: cooling the refrigerant below its condensing temperature means vapor. 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Outlet are 78kJ/kg and 182 kJ/kg respectively system will be the value of COP of reversed Carnot cycle operates. Page-1 section-2 Dec 16,2020 - Test: refrigeration and Air Conditioning -1 | 25 Questions MCQ Test has Questions mechanical! 2015 - 2020 mechanicaltutorial.com this Content is copyrighted by mechanicaltutorial.com |All Rights Reserved heat exchanger to superheating... ( 293 K ) the water is termed `` subcooled '' to the basics to understand what is... Compressor consumes a power of 30 kW important for competitive exams subcooling is the most widely used refrigeration rejects! Is the lowering in temperature of + 27°C and evaporator temperature of- 23°C ( also undercooling.: You can send your Comments directly at info @ mechanicaltutorial.com the liquid refrigerant its. Tool, especially in developing or investigating new, more complex refrigeration cycles above View answer / answer. 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