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yes of course - and when i approached you to quote for helping me i was asking you to prepare an Excel file that took into account the inlet water temperature and the flow m/s of water over the heating element as well as many other factors. i know that energy density is not the deciding factor...

this now makes sense. i have spoken to adThp on fiverr.com and he did some heat loss calculations for me. i dont know why you (adThp ) did not mention this is who you are in this post or on the messages you sent me to be on fiverr recently. the entire system is correctly earthed. the PCB has...

respectfully, you do not know the design of our system. I am well aware of the cheap dangerous water heaters you are talking about, and our system is not like this. We can give a constant in shower water temp of 42C with a 3.6 kW heating element at a flow rate of 6 lpm when the cold water is...

I didn’t get a message from them

Who is the OP?

i do not think its that simple, because the design of the heating chamber will affect the flow rate m/s of water over the heating element which will massively effect the heat transfer and therefore the peak temp on the heating element i did not consider that the water is actually moving very...

can you explain in simpler terms?

the 1" threaded hole on the side is where the heating element attaches the inlet is to the left and the outlet is to the right

sorry - i thought i replied but i must have hit preview instead of post they are in parallel. Total surface area across both elements where heat is emitted is 135 cm2 with total power output of 3600W This will most likely be a single coil with a surface area of 427 cm2 and a power output of...

So is a heat pump There are many used cases where the system is particularly suitable

The system has a heat exchanger in that recovers heat from use shower water. The preheated Coldwater can reach 35C. There is a preheat mode in the system where we recirculate water Using a pump past the heating element to heat the inner workings of the system. In this scenario the inlet...

Sorry, you are quite right. I should have realised this. Inlet temp is up to 40C with a flow rate of 6 lpm At 6 lpm, with a 3.5 kW heating element the max temp rise is 8C so the max outlet temp is 48C

TugboatEng - I agree I don’t know how to do the calculation to work out the maximum energy density we can have based on: - the flow rate and - surface area and - inlet water temperature

Depending on the energy density, will depend on the temperature of the water that is right next to the heating element. This will depend on different things such as the starting temperature of the water and the flow rate. If the water that touches the heating element raises above 60 or 65° C...

I need to know what energy density to target when I redesigned my heating element for our instant electric shower. Heating element is 3.5 kW, approximately 20 cm in length. We can’t have this limescale problem

the one in my picture is from our version of an instant water heater - so water flowing past the heating element

can you share the links to the guidelines that you found

they are spiral inside at that density they will be destroyed with limestone very quickly this is our current heating element which is 27W/cm2 (3600W/135cm2=27W/cm2) - this is after 6 weeks in a hard water area! with this design we get to 8w/cm2 ( 3.14*10*1360mm = 427.04cm². 3.5 kW / 427...

these heating elements are sold by the millions for these types of instant electric showers. i have ordered an electric shower to disassemble so i can work out the surface area of the heating element someone must know what is the acceptable range of energy densities for these widely available...

i am trying to find out what is considered acceptable for an instant electric shower's heating element the power range is 7 - 10.5 kW the flow rates are between 3-6 lpm - higher in summer and lower in winter - all depending on the temperature of the incoming cold feed. I do not know the...