Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same.

Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same.

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,...

See similar textbooks

Similar questions

Refrigerators currently being manufactured in the United States are using______as their refrigerant.
2. Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same.
Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same. Solve the following problems and sketch the schematic diagram describing the system. Show pertinent and complete solutions.
A heat pump like the one shown in the figure is used to heat a house during the winter months. The temperature inside the house is always kept at 21 ° C. When the estimated heat loss from the house is 135000 kJ / h, the outdoor temperature is -5 ° C. What is the minimum power required to drive this heat pump unit?
A gasoline truck engine takes in 10,000 J of heat and delivers 2,000 J of mechanical work per cycle. . What other machines utilize the concept of heat engine in its operation? Give at least 3 examples.
With a 1 kW pump, the energy leakage per unit time is 0.6 kW for a 1 ℃ temperature difference between a house to be heated and the outside environment. Coefficient of performance of the heat pump used to keep this house at a constant temperature of 20 ℃; If it is up to the theoretical heat pump performance coefficient; What is the minimum outdoor temperature ℃ for this heat pump to meet its needs and be used?
Find the rate at which heat is extracted from the refrigerated space.
a refrigerator operating in a room at 20 c has to extract heat at r rate of 500 w from the cabinet at 4 c to compensate for the imperfect insulation. how much power must be supplied to the motor if its efficiency is 80% of the maximum possible?
An inventor just invented a kind of heat engine that could operate at a maximum temperature of1000K and minimum temperature of 300K. This heat engine is used to drive a heat pump which extracts heat from the reservoir at 300 K. Its capacity is operating at a rate twice that at which the engine rejects heat to it. If the efficiency of the engine is 40% of the maximum possible and the COP of the heat pump is 50% of the maximum possible, what is the temperature of the reservoir to which the heat pump rejects heat? What is the rate of heat rejection from the heat pump if the rate of heat supply to the engine is 50 kW?
b. A heat source of unknown temperature supplies energy of (R + 650)kJ to a Carnot heat engine. If this engine sends (R + 250)kJ to a sink at (R + 26)°C find, i. The temperature of the heat source and R=30 ii. The efficiency of the heat engine
Problem 2- Refrigeration After returning from the store you place 4 bottles of water, 3 kg each, in the refrigerator. The water is initially at 25 °C and needs to be cooled to 10 °C. The refrigerator has a COP of 1.8 and a power input of 500 W. How long will it take for the refrigerator to cool the water? Is your calculation realistic? Explain.
The working temperature of a pair of heat pumps that are connected in series is between 300K and 600K degrees Celsius. When compared to the first heat pump, the efficiency of the second heat pump is three times higher. In this case, the second heat pump receives 20 kW of heat, and both the first and second heat pumps release 20 kW of heat. Calculate the input work for both heat pumps.