You are here:

Thermodynamics/Efficiency Boiler question

Advertisement


Question
Descriptive image
Descriptive image  
QUESTION: Do you think that packing immersed heater from common electrical boiler as shown on the attached image will increse significantly its efficiency.

Lets assume the wall of inner chamber is ideal thermal insulator.
the volume of the inner chamber is 10 timesl less , compared to volume of the outer chamber.

ANSWER: Hi Stoyan,

Its very hard to  say. What is the system intended to do?
Provide constant hot water?
Provide space heating and occasional hot water?
Does the system have a thermostat?
Increase the efficience relative to what?

Best wishes,
Kevin

---------- FOLLOW-UP ----------

Configuration inner chamber
Configuration inner ch  
QUESTION: Hi Kevin.
Thanks for your reply.
I wish you happy and successful new year.
Lets just take as example simple 80 litres home electrical (immersion heater) boiler.

And lets consider the walls of the inner chamber are ideal/perfect thermal insulator (no heat through them at all).
Also the volume of inner chamber is 10% (8 litres) of the total volume (80  litres).

Question is :  Will this configuration heat the water quicker.

I've made some suggestions, but definitely not sure.
See the "grey pipe" in the bottom of the attached image

BR.
Stoyan.

Answer
Hi Stoyan,

You have a fixed amount of water to heat, fixed heat loses to atmosphere and a fixed wattage supplied. The internal arrangements will thus have little effect. However if you draw water off through the internal cylinder you will save energy by not heating the whole tank/system.

Best wishes
Kevin.

Thermodynamics

All Answers


Answers by Expert:


Ask Experts

Volunteer


Kevin

Expertise

Thermodynamics, chemistry, chemical reactions, kinetics, chemical reaction safety, dust explosion technology, static electricity. General science.

Experience

Over 40 years experience as a practicing thermochemist in industry. Head of the fire and explosion laboratory of a major European chemical company (Ciba-Geigy). Now retired.

Organizations
Institute of Chemical Engineers. Royal Society of Chemistry.

Education/Credentials
Chartered Chemist, Member of the Royal Society of Chemistry (C.Chem MRSC). Msc Sheffield.

©2016 About.com. All rights reserved.