Input output and output power

[ldn_dea]

Hi all

I am trying to complete my abbe l3 in heat loss calcs and have a lot of questions to ask because i am just so stuck right now. Why is this so difficult? Im glad im on the course but didnt think it would be this difficult.

I have completed task 2 (hooray) and so dont think ill struggle with task 3 which is the same thing (floor plan + measuring up rads and windows + photos).

Task 4 is an absolute pain and would be very grateful if someone could walk me through it again.

Task 5 is the same as task 4 so if i complete that then t5 shouldnt be difficult.

Task 6 as above

Task 7 as above on my own home

Take 8: is a questionnaire. Question 5 of the questionnaire is asking about input, output and power output. Now im thinking this is all about the temp of air that goes in and what its heated to etc and how that affects the power output of the heat pump. Ill try and explain in my own words.

During summer: water vapour from air is fanned over and heated via refrigerant fluid, this causes evaporation and the air goes into a compression chamber where it is pressurised and becomes even hotter. This hot air gets released to the heat pump? and the remaining condensation is passed back over to the evaporator and refrigerant to start the process over again?

In the winter: ? This is where I am stuck and not sure how much different it would be in winter compared to summer except that more heat energy is lost in the process? Which means the pump has to work longer for the output to reach its designed performance level?

Any help very much appreciated.

P.s. when responding please could you bear in mind i do not have a background in construction so may not understand anything too complex or some jargon.

Thank you in advance.

Talei

 

[Clive]

Hi Talei,

You say Task 4 is a pain, but the reality is, it's what you would need to do if you were carrying out a survey and heat loss calc for a customer. You visit a house, measure and draw up a floorplan, and collect relevant info for the noise assessment etc. Take the required pictures, then gather the data and input the relevant measurements into the spreadsheet to calculate the heat loss. This was everything that we went through on the course itself, it's not something that we can simply 'walk through again' as you've asked.

Obviously the same thing applies to Tasks, 5, 6 & 7.

Q5 of Task 8 - I think you need to read through the relevant section on the Powerpoint slides again. There is a section that explains how teh refrigeration cycle works, which is not quite how you've described it although you're partly there. The process is exactly the same in winter and summer.