What is the Energy Consumption of a Heat Pump for an Average Size Automobile?

In summary: Plus you want to get rid of humidity from breathing. Plus you want to exchange air to get rid of odors, CO2, etc.In summary, the conversation discusses the energy requirements for running a heat pump in an average sized automobile and potential options for minimizing energy consumption and maintaining a quiet and low maintenance environment. The estimated energy consumption for an air conditioner in a car is around 500 watts, but there are other factors to consider such as insulation and climate. Suggestions are made for using evaporative cooling with water or harnessing waste heat from the mechanics of the system. The conversation ends with a suggestion for a vortex tube cooler with no moving parts.
  • #1
taylaron
Gold Member
397
1
Hi, I'm doing a science project involving the energy required to run a heat pump for the average size automobile measured in watts. I've been going through sites like mad, but can't find anything helpful. can anyone give me an estimate, or better, a reference to a site with such data on it? I'm guessing an average energy consumption of 2,500 Watts.
Thanks a bunch-

Tay
 
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  • #2
taylaron said:
Hi, I'm doing a science project involving the energy required to run a heat pump for the average size automobile measured in watts. I've been going through sites like mad, but can't find anything helpful. can anyone give me an estimate, or better, a reference to a site with such data on it? I'm guessing an average energy consumption of 2,500 Watts.
Thanks a bunch-

Tay

Do you mean like an air conditioner for the car?
 
  • #3
Im designing a new transportation vehicle that runs solely on electricitiy and I need to calculate how much power a decent heat pump (air conditioner/ heater) would consume. the interior of an average car is the approx size.
 
  • #4
Probably less than 2500 watts.

Auto air conditioners usually run off the motor, so it is hard to find power ratings in electrical terms. I couldn't find any.

But a small room air conditioner uses about 900 watts and this would be for a space about 6 times as big as a car. The car would have poorer insulation than a room, so maybe more like 500 watts. This is still a lot of power from a 12 volt supply (about 42 amps!).

Still just guessing, but it may be close enough.
 
  • #5
Look at doing something evaporative with water. Similar to a swamp cooler. You could have a heat exchanger if you don't want the humidity. Just add water and go.
 
  • #6
An air conditioner uses about 1.5 kW per ton. An air source heat pump has a COP anywhere from about 2-5. For the actual required capacity, you'll need to figure that out from the specifics of this vehicle of yours. How big is it? How much glass is in the shell? What climate is it in?

For heat, you may not need a heat pump: a decent amount of heat is lost in any system that converts electrical to mechanical energy, so you'll probably have some waste heat you can harness.
 
  • #7
Averagesupernova said:
Look at doing something evaporative with water. Similar to a swamp cooler. You could have a heat exchanger if you don't want the humidity. Just add water and go.
Whether that kind of thing works or not is highly dependent on the climate it is being applied to.
 
  • #8
I've calculated the inside volume to be about 20ft^3 and an average yearly climate ranging from 20 degF to 100 degF.

a unique element about this vehicle is that is has very few moving parts along with having extremely low maintenance. When I think of swamp coolers in something like this i think of something that would need to be maintained fairly often. which defeats the purpose here. It needs to be very quiet for the passengers and its environment. I realize a fan is a necessity here, but from my perspective, a swamp cooler would simply be too much. right? Additionally, it is small and compact, so it would probably have poor insulation thus increasing energy demand.

-regarding harnessing the waste heat from the mechanics of the system, there would be very little. The design I have rides on a rail, so it has an AC motor, single speed down step transmission and small wheels. From my perspective, there would not be enough heat to harness.

I'm not concerned too much about energy consumption in terms of demand, because this vehicle receives its power via a conductor on the track.

Regards-

Tay
 
  • #9
taylaron said:
I've calculated the inside volume to be about 20ft^3 and an average yearly climate ranging from 20 degF to 100 degF.

a unique element about this vehicle is that is has very few moving parts along with having extremely low maintenance. When I think of swamp coolers in something like this i think of something that would need to be maintained fairly often. which defeats the purpose here. It needs to be very quiet for the passengers and its environment. I realize a fan is a necessity here, but from my perspective, a swamp cooler would simply be too much. right? Additionally, it is small and compact, so it would probably have poor insulation thus increasing energy demand.

-regarding harnessing the waste heat from the mechanics of the system, there would be very little. The design I have rides on a rail, so it has an AC motor, single speed down step transmission and small wheels. From my perspective, there would not be enough heat to harness.

I'm not concerned too much about energy consumption in terms of demand, because this vehicle receives its power via a conductor on the track.

Regards-

Tay

I have seen pictures of something from the 50's that worked a little like a vortex tube cooler, it clipped to the top edge of a window which was rolled up almost all the way leaving room only for the discharge into the car. As the car moved down the road, air spiraled into the tube and the vortex action separated the cooler air which flowed into the car and the hotter air was entrained into the draft area behind the tube.

I have no clue what to search for or who might have made it, but it is something to consider.

P.S. no moving parts
 
  • #10
taylaron said:
I've calculated the inside volume to be about 20ft^3 and an average yearly climate ranging from 20 degF to 100 degF.
Wow, that's pretty small - like a cocoon. You could exchange that air with outside air heated to 85 F in the winter once a minute for 1400 BTU/hr or 400 W of heat power. And you'd have to do at least that, since that's the minimum ventilation per person you should give someone for comfort.
 

1. How does a heat pump affect my energy consumption?

A heat pump can greatly reduce your energy consumption by using a small amount of electricity to transfer heat from one place to another, rather than generating heat directly.

2. What factors affect the energy consumption of a heat pump?

The size and efficiency of the heat pump, as well as the climate and temperature of the area it is being used in, can all impact its energy consumption.

3. Can a heat pump be used in all climates?

While heat pumps are most commonly used in mild to moderate climates, there are models designed for colder climates that are able to operate efficiently even in extreme temperatures.

4. How does the energy consumption of a heat pump compare to other heating systems?

Compared to traditional heating systems, such as furnaces or boilers, heat pumps can result in significant energy savings. However, the exact amount of savings will depend on factors such as the efficiency of the heat pump and the cost of electricity in your area.

5. Are there any ways to further reduce the energy consumption of a heat pump?

Regular maintenance, such as cleaning or replacing air filters, can improve the efficiency of a heat pump and reduce its energy consumption. Additionally, using a programmable thermostat and properly insulating your home can also help reduce energy usage.

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