Electric heater is used to heat 0.63 liters/minute of water (c. = 4.18 kJ/kg.K density =1000 kg/m ) from 13 °C to 85 C. What is the current (in Amperes) that must be supplied to this heater if the supplied voltage is 220 V? Select one

Electric heater is used to heat 0.63 liters/minute of water (c. = 4.18 kJ/kg.K density =1000 kg/m ) from 13 °C to 85 C. What is the current (in Amperes) that must be supplied to this heater if the supplied voltage is 220 V? Select one

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

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 13RQ: If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7F,...

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A refrigeration unit with COP = 3.8 is being used to remove heat from a particular machine by 0.42 kg/s of water (C, = 4.18 kJ/kg.K) at 20 °C that is chilled from 40 °C as shown in the Figure. What is the power input (in kW) to the refrigeration unit? Select one: O 11.15 1 2 10.97 9.24 REF TH O 13.26 QH O 14.63 O 12.32
Question 10 Consider a residential heat pump use to maintain the inside air temperature of the house at 23C. Assuming Carnot assumptions, estimate the minimum power requirements (kW) if the outside temperature is OC and the house requires 1 kW of heating per temperature difference between the indoors and the outdoors temperatures (C). 2.392 12.87 1.163 1.787
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A heat engine with efficiency - 60%, driving both a heat pump and refrigerator at the same time, the work generated by the heat engine (WHE=W₁+W₂) W₁ gose to heat pump which (COPH.P.= 2), and W₂ gose to Ref. From the Figure and missing 850 K Tmax =? Tmax=? values, Find: Qodd? a) The Qadd. Qrej, and Tmin of the Heat Pump. b) The Qadd. Qrej, and Tmax of the Heat Engine c) The Qrej. COPRef., and Tmax of the Refrigerator H.P. Tmin=? Qass=? W-150 K H.E. Qraj? 75 K W₂-50 K/ Redd 60 KJ Ref. 50 K
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QUESTION 4 A manufacturer conducted an experiment for an evaporator capacity 500 kW cooling and designed for high COP of 2 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 650 kW, determine: Ethalphy of the refrigerant entering the Evaporator in kJ/kg Answer in two decimal places
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