AC & Heat Pumps: Motor Vehicle Solutions

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Discussion Overview

The discussion revolves around the use of air conditioning (AC) systems in motor vehicles, specifically the potential for AC units to function as heat pumps to provide immediate warmth in cold conditions. Participants explore the feasibility, cost implications, and existing alternatives in automotive heating systems.

Discussion Character

  • Debate/contested, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant suggests that AC units could be designed to operate as heat pumps for immediate warmth, questioning why manufacturers do not implement such systems, possibly due to cost.
  • Another participant raises the point that using heat generated by the engine is a common practice, implying that it may be more efficient than relying solely on an AC heat pump.
  • Cost is highlighted by multiple participants as a significant factor, with one noting that the expense may not justify the limited use of the system.
  • A participant mentions that a simple solution exists in the form of PTC heaters, which are found in many hybrid and diesel vehicles.
  • One participant shares a personal anecdote about using a remote starter to preheat or cool a vehicle, indicating that while it incurs extra fuel costs, it is beneficial in extreme temperatures.
  • There is a general acknowledgment that while the proposed system is technically possible, the practicality and efficiency of existing solutions are also important considerations.

Areas of Agreement / Disagreement

Participants express differing views on the practicality and cost-effectiveness of implementing heat pump systems in vehicles. While some agree that it is possible, others emphasize the efficiency of using engine heat and the associated costs of alternative solutions.

Contextual Notes

Participants do not fully explore the technical specifications or limitations of heat pump systems in vehicles, nor do they address the potential trade-offs between different heating methods.

Who May Find This Useful

Individuals interested in automotive engineering, HVAC systems in vehicles, and those exploring efficient heating solutions for cold weather driving may find this discussion relevant.

Jobrag
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On a hot day the AC in my car starts working immediately pumping cool air, on a cold day I have to wait till the cooling system heats up before I get warm air. It would be perfectly possible (with the aid of a couple of solenoid valves) for the AC unit to run as a heat pump providing immediate warmth, why don't motor manufactures fit a system like that? Is it just cost?
 
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So you don't want to use the heat generated by the engine; just loose it?
 
It is a big expense for something only used for 5 min per day.
 
Yeah it's pretty much the same old story. Anything that is physically possible can be done, but at a cost.
 
Simple fix, and it's found in most hybrid cars and some diesels...PTC heater.
 
My son in law in the cold north, uses a remote starter.
Starts his car about 5 min before he gets out of work.
This method also works for cooling the car down in summer.
It does cost some extra fuel, but if it's -20F, it's worth it.
The answer to your original question is Yes it is possible,
but the engine heat is already there, no need to squeeze
your own out of the air.
 

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