Refrigerators Definition and 20 Threads

Refrigerators run on Carnot cycle. It is like a heat pump that operates on the reversed Carnot cycle. It utilizes the evaporation of the refrigerant to absor...

For the heat engine: First I converted all the temperatures to Kelvin, ηmax=1-(333)/(1000)=0.667 ηclaim=(1*10^3)/(1.75*10^3)=0.5714 So the heat engine seems to be less efficient than a Carnot heat engine which means it can exist. For the refrigerator: COPmax=(253)/(363-253)=2.3...

How does the capillary tube decrease the pressure on the liquid when its diameter is smaller? How small diameter of capillary tube is helpful in causing more pressure drop? And how, when pressure drops, the liquid instantly cools down?

Homework Statement The following data refer to an electrically operated refrigerator: - Efficiency : ## \xi = 2.4## - Temperature inside: ##T_i = -9 ° C ## - Temperature of the radiator ## T_r = 40 °C ## - Room temperature: ## T_s = 35 °C## - Total surface of walls: ## A = 3.2 m ^ 2 ## -...

Homework Statement Fill in the empty columns of the following table: Homework Equations y = ΔE x c P = ΔE/Δt ΔE = Y/ Δt The Attempt at a Solution [/B] Part d) Yearly energy cost: Use Y=ΔE x c Refrigerator, top freezer: Y = (448 kWh/yr) ($ 0.06) Y = $ 26. 88/yr Refrigerator, bottom...

Homework Statement The temperature inside the room ##T_I= 25 C ## and the temperature outside the house is ##T_O = 32C##. The temperature difference causes energy to flow into the room (by conduction through the walls and window glass) at the rate 3,000 J/s. To return this energy to the...

Homework Statement Assume that you heat your home with a heat pump whose heat exchanger is at Tc=2∘C, and which maintains the baseboard radiators at Th=47∘C. If it would cost $1000 to heat the house for one winter with ideal electric heaters (which have a coefficient of performance of 1), how...

I am a little confused, because I know how refrigerators work with a refrigerant and a compressor and heat exchanges, and I am looking to build one myself, just wondering because I was looking for refrigerator compressors online to buy. Do they have an inlet for refrigerant or is the...

Homework Statement a)A stone at 400K with heat capacity ##c_p## is placed in a very large lake at 300K. The stone cools rapidly to 300K. Calculate the entropy change, due to this process, of the stone and lake. b)An insulated cool-box of a Carnot refrigerator at temperature T loses heat...

My father told me that when he was a child in the 1950s, his parents owned a natural gas powered refrigerator. He said that the refrigerator made no noise when it was running. I can't fathom how a natural gas powered refrigerator would work. I mean, it would make no sense for natural gas to...

Dear all, Can the conservation of mass principle be applied to the mass flow rate of a refrigerant in an ideal refrigerator system? And what about for an actual refrigeration system? I'm reading the principle here but can't work it out. Says that it applies for steady flow, but I assume...

Homework Statement Suppose 10000 J is transferred between a large thermal reservoir at a temperature of 300 K to another large thermal reservoir at 500 K. What is the net change in entropy of the system? Write an expression for the factor by which the multiplicity of the system changes...

could you explain me the working of a heat pump or a refrigerator

Hi, I was looking at how refrigerators and air conditioners work as part of thermodynamics and I came across the expansion valve. I am a bit confused. From what I understand, there is this expansion valve. When the liquid freon, or ammonia as used as an example in this website, goes...

A refrigerator has coils in back that get hot, and heat is molecular motion. These moving molecules have both energy and momentum. Why doesn't the refrigerator need to be tied to the wall to keep it from recoiling from the momentum it loses out the back?

I can't go to sleep until I find an answer and I'm no student of physics so I was hoping for a little help. If two refrigerators are at the same thermostat setting. One empty (assumed regular Earth air inside) and one full of food. Both have already reached the temperature on the thermostat...

Homework Statement The coefficient of performance of a refrigerator is 5.40. The compressor uses 30.0 J of energy per cycle. a) How much heat energy is exhausted per cycle? b) If the hot-reservoir temperature is 27.0C, what is the lowest possible temperature in C of the cold reservoir...

Homework Statement I am not necessarily having a problem with a particular homework problem. It is more of a conceptual issue. I have been reading about Carnot engines and refrigerators. In trying to understand the topic better, I did a little more digging and looked up how a refrigerator...

Could someone explain to me how heat engines and refrigerators and air conditioners work. I'm very confused about the process and if they are isothermic, isovolumetric, or adiabatic. ~Kitty

Show that the relationship betwee efficiency (n) of a Carnot engine and the coefficient of performance (w) of the same engine when operated as a refrigerator is given by nw= Tc/Th Is a Carnot engine whose efficiency is very high particularly suited as a refrigerator? Why? Well we know that...