The effect of thermal insulation on HIACE

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Add thermal insulation to my new HIACE VAN

My newly ordered HIACE VAN was delivered on Aug./5/2017.

One of the popular modifications among HIACE buffs is add heat insulation material between the panel and inner linings.

I was planning to go to Hokkaido, northern part of Japan in winter, so adding thermal insulation was my first priority.

I started the work in August, and it was very hot inside the HIACE VAN in the middle of summer.

Source of information

Beforehand, I got useful information from the following blogs. (They are all written in Japanese.)

HIACE-SGL.net

Quest for enjoyment with HIACE

48rider.com

It was really hard work

Remove the carpet on the floor.

Put an insulation mat between the floor and the carpet.

Remove inner linings.

Install heat insulation on HIACE VAN

Remove the rear first.

Install heat insulation on HIACE VAN

Then, remove the front, too.

Put insulation mat on the ceiling.

Install heat insulation on HIACE VAN

See the passenger cabin from rear.

Install heat insulation on HIACE VAN

See the luggage room from front.

Then, glue fiberglass insulator onto the ceiling.

Install heat insulation on HIACE VAN

Glue fiberglass thermal insulator onto the front ceiling.

Recover the inner linings.

It was so difficult for me to attach the linings again. They are too large to deal by myself.

(Sorry, I was too exhausted to take any photos.)

It took almost 7 days to finish the work.

My neighbors were thinking I was dismantling my car.

Make thermal insulation window panels

I made heat insulation panels from 30mm thick Styrofoam board.

Link to Monotaro.

Measure the effect of heat insulation

Seeing the cargo room from front.

I learned the details from the page.

Add a curtain to avoid cold air coming from front cabin.

This is heat insulating type curtain. Link to Amazon

Measure the effect of heat insulation

Curtains installed between passenger cabin and cargo room.

Clarify the advantage of thermal insulation

Before starting to Hokkaido, I wanted to test the effect of above heat insulation items.

Items used for the test

Electric blanket

rated power: 60W

Thermometer

It can measure outside temperature as well via wired sensor.

Unfortunately, now out of stock. Link to Amazon

Test1

Condition

The car was stopping during the test.

Heat generation : By 2 of electric blankets, used all the time

Items used for heat insulation  :Curtain, Window panels.(Rear hatch window, side widows of cargo room are all covered.)

Measured data

Difference means (Inside temperature) – (Outside temperature). Therefore, positive difference means inside is warmer than outside.

Remarks

Inside of the car maintained about 4 degrees Celsius higher than outside until midnight.

In the morning, outside was getting warm first, then heat went into inside to raise the temperature.

Test2

Condition

The car was stopping during the test.

Heat generation : By 2 of electric blankets, used all the time.

Items used for heat insulation :None (Heat insulation material installed inside of the inner trims were same as Test1.)

Measured data

Remarks

Inside of the car is about 1 degree Celsius colder than Test1.

Therefore, this 1 degree Celsius was given by the window panels and curtain, and other 3 degrees Celsius are given by heat insulation installed between the panel and inner linings.

Result

If you install fiberglass inside of inner linings,

  • Car inside temperature will be higher by 3 degrees Celsius with 120 W heat.
  • It would be 4 degree Celsius if you add heat insulation panel on cargo room windows, and a curtain between cargo room and passenger cabin.

Notes

It is said that the heat coming out of one person is about 100 W, so 2 electric blankets can be replaced for one person.

When car inside temperature was measured, I opened a door to see the thermometer, and at that time, I couldn’t avoid outside air coming inside, and affecting the inside temperature.

Thank you for reading my article.

Note

The original article was written and published on Nov./7/2017.

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