• entries
    15
  • comments
    11
  • views
    214

About this blog

This is a short blog about the thinking process, installation and results of a combined ASHP, MVHR, PV, EV charging and Water heating coil system being installed in a bungalow with good insulation and air tightness.

 

Be warned! The theory, installation and results assumed may not be right and I will only be sure when the job is completed.

 

Should you have any questions about this PM me and I will try to include an answer in the blog.

 

Good luck with your home

 

Marvin

Entries in this blog

 

ASHP on a flat roof

Not really having much information to go on when installing an ASHP on my flat roof, we decided to go ahead anyway.    Questions that arose were about things like will it blow over, can the warm roof take the weight, can the warm roof take all the vibration,  will it wear away the EDPM, is the condensation OK to go into the soakaway, is there much maintenance required, how heavy is the ASHP,  can we get it up there, can we get the power up there, will the control cables reach where we

Marvin

Marvin

 

Water coil installation into MVHR

This is posted during the design and installation phase during the winter 2021/2022.  The cooling side results are not expected to be known until Summer 2022.   As the air passes through the water coil it changes temperature depending on the coil water temperature. If the coil is going to be used for heating only it can be used without a condensate trap. However as this is going to be used for cooling as well I have constructed a drain in the bottom.   Coil with lid off. Air

Marvin

Marvin

 

Loft insulation

The existing loft insulation irritated the .... out of me. Mainly because I needed to change a lot of pipes in the loft and the roof is only 22.5 degrees and the fluffy was very thick.  What with the 150mm insulated MVHR pipes (190mm thick) 2 high and a roof at 1300 ish it was too cramped. Anyone looking at the ducting photos will see the loft was bare. Before insulating, the bungalow was loosing 87% of the heat through the roof because the rest is so well insulated. Gonna have to tur

Marvin

Marvin

Loft insulation

Loft insulation

The existing loft insulation irritated the .... out of me. Mainly because I needed to change a lot of pipes in the loft and the roof is only 22.5 degrees and the fluffy was very thick.  What with the 150mm insulated MVHR pipes (190mm thick) 2 high and a roof at 1300 ish it was too cramped. Anyone looking at the ducting photos will see the loft was bare. Before insulating, the bungalow was loosing 87% of the heat through the roof because the rest is so well insulated. Gonna have to tur

Marvin

Marvin

MVHR Installation 2

MVHR Installation 2

More of the same...   When insulating the ducts I noticed that the top of the MVHR was not insulated so I have installed flexi conduit on the cables ready to throw fluffy over the top.       This is the inlet pipe running under the ridge. 150 diameter with insulation held on with cable ties     An installed air damper in red. More about these later....     Water coil with thermal lid. Lid made from PIR.    

Marvin

Marvin

ASHP installation info

ASHP installation info

The viewpoint used to decide items is a balance between the outlay cost and the running costs. This system will not be the cheapest way to produce heating and hot water nor the most expensive installation system but a balance related to the existing equipment and personal requirements.   BEST ADVICE: Read the manual of the product you are proposing to use BEFORE you buy, especially regarding the installation and check that it will work for you.   Choosing the ASHP: The s

Marvin

Marvin

 

Heating and cooling assumptions.

An Excel spread sheet has been used to calculate the heating and cooling.   One thing also calculated is that at peak energy the bungalow requires as much for the heating in the winter as for the cooling in the summer! So the hottest part of the hottest day and the coldest part of the coldest night need about the same amount of power! This is mainly because of the solar gain through the windows.   The calculations were compared with what has been used for heating and it is re

Marvin

Marvin

 

Assessing heating/hot water energy prior to Combo

Following  1 I try to detail the info so people can check...   The bungalow ran on LPG bottled gas for 3 years heating and hot water so I know what was used: I have used the worst 2 years:   I am using the conversion rate of  one kg of LPG gas giving about 14.091kW hours   In 2 years we used about 13277kW of LPG energy for heating and hot water. ( about 10 bottles of 47kg ) If we deduct a modest 2kW for ho

Marvin

Marvin

 

List of equipment being installed

The holistic set I am installing is:   ASHP main parts: : Air to water Cool Energy inverTech Air Source Heat Pump CE-iVT9 4.3kW-9.5kW Cool Energy 60L Stainless Buffer Tank CE-B60   MVHR main parts:  Domus HRX2-D Heat recovery System with "summer bypass" 125mm and 150mm rigid circular ducting and Domus duct insulation.     Electricity Generation main parts: PV Sofar Solar Grid Tied Inverter 6KTLM-G2 16 Longi  320W Mono Solar Panels

Marvin

Marvin

 

Bungalow air tightness

Air tightness was followed to a reasonable standard:   All external walls sealed with plastic before the electric first fix   Plasterboard ceiling to almost floor and then siliconed / masticed to floor.   No open fireplaces, cat flaps or tricklevent.

Marvin

Marvin

 

Bungalow thermal elements

The bungalow has an average of 180mm of PIR under the suspended floor. The cavity walls have an average of 140mm PIR in the walls The loft has an average of 300mm of fluffy. Theflat roof has 200mm PIR. The doors and windows are the latest double glazing.

Marvin

Marvin

 

Bungalow history

The bungalow was built in the 1970's and extensively renovated in the last 4 years.   It has external block walls and timber suspended floor, timber frame including all internal walls and concrete tiled roof running east/west at a rise of 23 degrees.   Having never heard of, or gained knowledge from, buildhub I renovated and extended the bungalow as best as I knew. The garage was converted and has a flat roof. Fortunately the work included insulation, air tightness and a MVHR

Marvin

Marvin