Calculating Heat Loss from Room with Refrigerator and Heater

AI Thread Summary
The discussion revolves around calculating heat loss in a room with a refrigerator and a heater, where both appliances are running continuously but the room temperature remains constant. The refrigerator consumes 250 W, and the heater uses 1 kW, leading to a total input of 1250 W. Participants highlight the concept of energy conservation, stating that if the temperature is stable, the heat loss from the room must equal the total energy input from the appliances. This indicates that the heat loss rate is effectively balanced by the energy supplied by the refrigerator and heater. Understanding this equilibrium is key to solving the problem.
oliverjames
Messages
5
Reaction score
0
A room contains 25 kg of air at 100KPa and 10 degree C. The room has a 250-W refrigerator (the refrigerator consumes 250 W of electricity when running) and 1-KW electric resistance heater. During a cold winter day, it is observed that both the refrigerator and the resistance heater are running continuously but the air temperature in the room remains constant. The rate of heat loss from the room during that day is:

I`m having trouble solving this . can anyone please help?

cheers
james
 
Science news on Phys.org
It's a bit of a trick question, but when you see the trick, it is rediculously easy (that should be a hint...).
 
ok . if i omit the room criteria and if i`m taking only the refrigerator data the heat loss to the room would be 1250 Kw. correct me if i was wrong. Thanks . James
 
Yep, it really is that easy. Nice! Conservation of energy says that if you're at an equilibrium, the inputs and outputs must be equal.
 

Thread 'Condensate rate of water for an air conditioning cooling coil'

I need to calculate the amount of water condensed from a DX cooling coil per hour given the size of the expansion coil (the total condensing surface area), the incoming air temperature, the amount of air flow from the fan, the BTU capacity of the compressor and the incoming air humidity. There are lots of condenser calculators around but they all need the air flow and incoming and outgoing humidity and then give a total volume of condensed water but I need more than that. The size of the...
View full post »
Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Thread 'Why work is PdV and not (P+dP)dV in an isothermal process?'

Let's say we have a cylinder of volume V1 with a frictionless movable piston and some gas trapped inside with pressure P1 and temperature T1. On top of the piston lay some small pebbles that add weight and essentially create the pressure P1. Also the system is inside a reservoir of water that keeps its temperature constant at T1. The system is in equilibrium at V1, P1, T1. Now let's say i put another very small pebble on top of the piston (0,00001kg) and after some seconds the system...
View full post »

Similar threads

A Calculating the heat loss of an open water tank (aquarium)
Replies
2
Views
3K
B How to estimate the heating power of warm air entering a room?
Replies
8
Views
3K
How Does Newton's Law of Cooling Affect Heat Loss Calculations?
Replies
2
Views
2K
Strange claims about heat transfer
Replies
3
Views
1K
Using a fan and space heater to warm up a room
Replies
9
Views
52K
Heat Loss Through a Short Cylinder
Replies
1
Views
2K
Calculate the Heat Loss in a Hot Water Tank from a Shower
Replies
2
Views
3K
Thermodynamics - Hypothermia - Heat loss
Replies
12
Views
2K
Optimizing Air Flow for CO2 and Heat Loss in Vans
Replies
7
Views
3K
How to Calculate Heat Dissipation in an Electric Motor?
Replies
6
Views
7K

Hot Threads

Recent Insights

Back
Top