Aug 5, 2022
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# How to improve the efficiency of your car air conditioner and save fuel

First, let’s figure out how the thermal insulation of air conditioning pipes affects fuel consumption. At the same time, the initial task was to improve the cooling of the passenger compartment, and we succeeded.

The temperature in the cabin dropped from 7-8 degrees Celsius to 3-4.

## Vehicle test with and without insulated tubes

To understand how the thermal insulation of air conditioning pipes affects fuel consumption, we will drive the same distance 2 times with thermally insulated pipes, and then without them. Then we summarize the data of races and draw conclusions.

To accurately record the distance traveled and the fuel spent on it, we use the ELM 327 device, which we connect to a cell phone with the appropriate program.

For all races, we choose a distance of 5-7 km on a flat horizontal track. We accelerate the car to 90 km / h and put it on a cruise. We set the operation of the air conditioner to 4 division. We direct the cooled air to the glass and legs without recirculation. We fix the outside temperature, which is equal to +32 degrees Celsius. We reset the mileage and fuel consumption indicators on the phone to 0.

We start 2 races with heat-insulated air conditioning pipes. The first run of 7.1 km required 0.456 liters of fuel, the second – 0.454 liters. We remove the thermal insulation from the tubes of the air conditioner and also make 2 runs under the same conditions. Fuel consumption is 0.462 liters and 0.464 liters, respectively, for the same 7.1 km.

## What result?

The efficiency of the air conditioner with the thermal insulation removed from the tubes has really decreased. In the cabin, at 4th division, it became noticeably hotter and had to switch to 5th division to ensure the required comfort.

About fuel economy. In the presence of thermal insulation on the tubes of the air conditioner, the average fuel consumption was (0.454 + 0.456) : 2 = 0455 liters, in the absence of – (0.462 + 0.464) : 2 = 0.463 liters. Fuel Economy: /(0.463 – 0.455) : 0.455/ × 100% = 1.76%. That is, savings from every 10 liters of fuel will be about 0.2 liters., And from 100 liters already 2 liters. Quite good.

The fears of some skeptics about the accumulation of condensate between the tubes and the thermal insulation did not materialize. The thermal insulation and pipes were dry, except for the lowest section of the pipes, where the condensate drained and went outside. To make this process more intensive, a narrow gap can be left in this place in the thermal insulation.

As a material for thermal insulation of pipes, we consider K-FLEX, used for insulation of industrial pipelines, aluminum foil and plastic clamps to be the most suitable material.

## Watch the video

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