Chapter 5, Problem 5.13P

Yeji just came back from dance practice and went straight to her bedroom. It was summer so the temperature in her bedroom was estimated to be around 40°C. She then turned her air conditioner on, closed her door and windows, and it cooled her bedroom to 18°C in 20 minutes. Calculate,a. How much heat was transferred to cool her bedroom to 18°C?b. What is the power consumption of the air conditioner, in kW?The air conditioner has a COP of 2.8. Assume the mass of her entire bedroom to be 750 kg of air, Cv = 0.72 kJ/kg.°C and Cp = 1.0 kJ/kg.°C.*Round off all answers to four decimal places*

A room is heated by an iron that is left plugged in. Is this a heat or work injection? Take the entire room, including the iron as the system.

Please include a diagram for better understanding. Don't use chatgpt,I am tired of it.

Find out the COP of a Carnot heat pump operating between 6°C and 37°C.

A refrigerating system has a refrigerating effect per kilogram of 220kJ. The heat to be removed is 630kJ/hr. Calculate the required power input if the COP is 4. (answer in kW)

The heat loss from a chicken coop (chicken house) is K(Tnside - Totside) during the winter, where K is 1.5 kW/K. The chicken coop temperature can vary between 15 °C and 25 °C without harming egg production. A heat pump with a coefficient of performance of 40% of that of a reversible heat pump is used to heat the chicken coop. What are the minimum power requirements if the outside temperature is -5 °C? .

3.) When a gas surrounded by air is compressed or expands adiabatically, its temperature rises or decreased even though there is no heat input or dissipated to the gas. Where does the energy come from to raise or lower the temperature? 4.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in?

A heat pump with a motor of 2 kW is used to keep a chicken hatchery at 30°C. This latter loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% of a Carnot heat pump. a- Draw a sketch for the entire system showing all energy transfers. b- Illustrate a heat pump operating between two constant-temperature energy reservoirs showing all energy transfers. c- What is the minimum ambient temperature for which the heat pump is sufficient?

A refrigerator working between 283 K to 310K and extracting 340 J of heat. How much work required to run the refrigerator.