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Energy, Health & Comfort

EHC:1 Space Heating 

AIM

To encourage and recognise lower carbon dioxide (CO2) emitting space heaters.


CREDIT CRITERIA

Up to six points are available for dwellings which have a very low ‘carbon dioxide emissions to space heating load’ ratio (i.e. kg CO2 per kWh/m2).

Design Rating Documentation

how the Living House does

The Living House is targeting the full 6 points for space heating as we are also targeting Passive House certification and therefore our design and construction will be modelled and verified in PHPP as not requiring any additional heating sources (such as heat pumps, fire places (which are banned by the Living Building Challenge) or electric heaters. 

The Living House is therefore designed to slowly absorb heat during the day through the thermal mass of the rammed earth, and then slowly release the heat during the evenings. 

EHC:2 Hot Water

 

AIM

To encourage and recognise the reduction of carbon dioxide (CO2) emissions associated with hot water production for the dwelling.


CREDIT CRITERIA

Up to four and a half points are available based on the efficiency of the hot water system compared with an ‘average’ system, as measured by CO2 emissions.

how the Living House does

The Living House is targeting the full 4.5 points for hot water through the use of the innovative Energie hot water system.

 

The Energie system works by using a refrigerant in the panel instead of water. The refrigerant liquid is at approx. -28 degrees Celsius. The air around the panel warms the liquid and it evaporates to form a hot gas. A small compressor attached to the cylinder compresses the gas, giving off even more heat. The very hot gas then travels around a spiral heat exchanger in the cylinder and gives up its heat to the water in the cylinder which surrounds the heat exchanger. As the gas cools it condensates (giving off more heat) and returns to a liquid, goes back to the panel and the process is repeated.

It is a very simple system with few moving parts, as it works by differential temperature – the difference between the temperature of the air around the panel and the very cold liquid in the panel.

Design Rating Documentation

EHC:3 Lighting

 

AIM

To encourage and recognise the reduction of energy consumption associated with interior and exterior lighting.


CREDIT CRITERIA 

For the full two points you have to do the following:

INTERIOR LIGHTING:

• 90% (by count) of installed lamps have a minimum efficacy of 35 lumens per watt, AND
• 25% (by count) of the most efficient (i.e. 35 lumens per watt or greater) lamps are not replaceable with lower efficiency lamps, either through permanently wired integral fittings such as LED lighting or with dedicated bases which only allow lamps to be replaced with those of equal efficacy, AND
• All light fittings within the lounge or main living area must be integral fittings or dedicated bases.


OUTDOOR LIGHTING:
• 100% (by count) of exterior lighting have daylight cut-off devices with motion sensor controls or integrated photovoltaic cells. AND
• 100% (by count) of installed lamps have a minimum efficacy of 20 lumens per watt.

Design Rating Documentation

how the Living House does

The Living House is targeting the full 2 points for lighting. We don't have a lighting design completed at this point in time, but whatever is designed will be compliant with the above criteria.

EHC:4 Whiteware & Appliances

 

AIM

To encourage and recognise the provision or purchase of energy efficient whiteware, to reduce the energy load from appliance use in the dwelling.


CREDIT CRITERIA 

Design Rating Documentation

how the Living House does

The Living House is targeting the full 2 points for whiteware and appliances. Due to the Living Building Challenges Net Positive Energy requirements we will be selecting the most energy efficient appliances possible. 

EHC:5 Renewable Energy

AIM

To encourage and recognise the installation and operation of local renewable electricity generation systems to reduce carbon dioxide (CO2) emissions as part of everyday dwelling operations.


CREDIT CRITERIA 

Up to eight points are available to dwellings which reduce their CO2 emissions through reliance on electricity generating renewable energy system(s).

how the Living House does

The Living House is targeting the full 8 points for renewable energy in line with the Living Building Challenges requirement that we generate 105% of our energy demand on site.

Design Rating Documentation

EHC:6 Whole House Thermal Performance

 

AIM

To recognise the reduction of purchased energy associated with space heating and cooling of the house, through good passive solar design.


CREDIT CRITERIA

Up to 15 points are available for designs which provide passive thermal comfort all year round.

Design Rating Documentation

how the Living House does

The Living House is targeting the full 6 points for space heating as we are also targeting Passive House certification and therefore our design and construction will be modelled and verified in PHPP as not requiring any additional heating sources (such as heat pumps, fire places (which are banned by the Living Building Challenge) or electric heaters. 

The Living House is therefore designed to slowly absorb heat during the day through the thermal mass of the rammed earth, and then slowly release the heat during the evenings. 

EHC:7 Moisture Control

AIM

To encourage and recognise measures that control indoor moisture levels, improve indoor environment for occupants, reduce respiratory illnesses and the risk of mould, and to increase the durability of the dwelling.


CREDIT CRITERIA

Up to four and a half points are available where it is demonstrated that indoor moisture levels have been managed as below:

Minimising Potential Moisture Sources
a.Containment of overflow
In rooms that have washing/bathing fixtures, are there either overflows on all fixtures OR is a floor waste provided?


b.Eliminating ground moisture
Is there a ground cover (e.g. polythene sheeting) under any suspended timber floors? N.B. Points are awarded automatically for concrete floors.


c.Absence of unflued gas heating

d.Showers completely enclosed

Minimising Condensation

Is the dwelling adequately insulated to discourage condensation on exterior walls, ceilings and floors? This is based on the following requirements.

Providing Localised Ventilation at Moisture Sources
Option A: Stand alone features
a.Is there a dedicated extraction system for the cooking hob vented to outside?

b.Is there a dedicated extraction system for each bathroom vented to outside?

c.Is every bathroom extraction system:
(i) Automated to turn on without manual switching in some way (hardwired to a light switch, humidistat, timer or passive infrared)?
(ii) Placed so as to adequately deal with the source of steam?

d.Do all outlet grilles from all the extraction systems have:
(i) A cover to protect the outlet grill?
(ii) Blades angled to deflect the rain?

e.Is the clothes dryer extract ducted directly from the appliance to the outside, not the roof space, OR is the appliance a condensing clothes dryer, OR is there no clothes dryer in the dwelling?

Option B: Integrated System
Is there a centralised building ventilation system that the following areas connect to:
a.Cooking hob vent

b.Is the clothes dryer connected to centralised duct directly extracted to the outside OR is the appliance a condensing clothes dryer, OR is there no clothes dryer in the dwelling.

c.Bathroom extract(s)

d.Is every bathroom extraction system:
(i) Automated in some way (hardwired to a light switch, humidistat, timer or passive infrared)?
(ii) Placed so as to adequately deal to the source of steam?

 

Ensuring Moisture Removal on a Dwelling Wide Scale
a.Passive option:
(i)Is there a net openable area of windows (or other openings) to the outside of no less than 5% of the floor area?
(ii) Are at least 90% of the openable windows/openings constructed in a way that allows them to be secured against intruder entry while open (i.e. to at least 10mm along one edge)?

Mechanical Option:
Is there a whole house mechanical air supply ventilation system with:
(i)Externally sourced air or filtered air transferred from the roof cavity (supply only – positive pressure)?
(ii)A heat exchanger utilising heat and relative humidity from exhaust air (balanced pressure heat recovery)?
(iii)Do all outlet grilles from all the extraction systems associated with the whole house mechanical air supply ventilation system have:
a) A cover to protect the outlet grill?
b) Blades angled to deflect the rain?

Design Rating Documentation

how the Living House does

Phew! That is a huge list of requirements isn't it. Anyway the Living House is targeting full points here throuhg the following design strategies:

Minimising Potential Moisture Sources

1. overflows on all fixtures

2. concrete slab

3. Showerdomes on all showers

Minimising Condensation

Ceiling R-value of >R3

Wall R-values of >R3

Floor R-value of > R2

Glazing R-value of R1

Providing Localised Ventilation at Moisture Sources & Ensuring Moisture Removal on a Dwelling Wide Scale

We are proposing to install a Zender ventilation system in the Living House. We are installing the Zender system in accordance with our desire to achieve Passive House certification and luckily it also ticks all the EHC-7 boxes at the same time. At this stage for the Homestar Design Rating we have documented compliance with a passive ventilation system as we have not fully designed the Zender system yet. 

EHC:8 Washing Line

 

AIM

To recognise and encourage the reduction in the amount of energy used to dry clothes with a tumble dryer or similar.


CREDIT CRITERIA

1)18m of line for each three (or more) bedroom dwelling, OR 12m for each one or two bedroom dwelling.

2) Primary Space: 0.3 points are awarded for a fixed washing line that is located in an external space where the primary use is to dry washing OR

Secondary Space: 0.1 points are awarded for a washing line that is located in a space where the secondary use is to dry washing (e.g. in a garage, workshop or similar space outside of the dwelling’s thermal envelope).

3) A covered washing line will be awarded an additional 0.4 points as it will increase its usefulness when raining

Design Rating Documentation

how the Living House does

The Living House is targeting the full 1 point. We will have a washing line outside in the garden. We will also have a second washing line in the garage to use when it is raining outside. 

EHC:9 Sound Insulation

 

AIM

To encourage and recognise the provision of an improved sound environment protected from both internal and external sources within the dwelling.


CREDIT CRITERIA

a.Windows: 80% (by count) of windows have a Sound Transmission Class (STC) of 33 or more.
b.Mechanical or Natural Ventilation: Mechanically ventilated OR sound insulating ventilation strips (trickle vents).
c.Internal Walls: One living space or designated noisy room with a fibrous infill and double layer plasterboard
d.Noisy Room: Designated room (if applicable) for noisy activities such as entertainment rooms (audit visual), music rooms, bedroom(s) and children’s play rooms. Noisy rooms must be designated in the HUG under the ‘Key house operation information’ – ‘Energy health and Comfort’ section
e.Solid Core Doors: Noisy room has a solid core internal door with acoustic seals.
f.Carpet or Acoustic Ceiling Tiles: 80% of liveable rooms (by count) will contain carpet or acoustic ceiling tile.

Design Rating Documentation

how the Living House does

For the first time the Living House will not be targeting full points in a credit. Instead we will only be targeting 1.33 points here in the following:

b.Mechanical Ventilation: We have the Zender system.

c.Internal Walls: Upstairs in the Living House we have a bedroom/office that we will designate as the noisy room and we will put Autex acoustic insulation in the walls of this room. 

 

d.Noisy Room: As above

 

e.Solid Core Doors: Our noisy room will have a solid core internal door with acoustic seals.

EHC:10 Inclusive Design

 

AIM

To encourage and recognise dwellings that are inclusive, usable, accessible and easily adaptable to meet the changing needs of current and future occupants.


CREDIT CRITERIA

how the Living House does

The Living House has achieved a provisional 4 star Lifemark rating on the main dwelling and a 5 star rating on the minor household unit. The reason we couldn't get a 5 star rating on the main dwelling was because the kitchen for the main dwelling is on the first floor and we are not installing a life or stair chair at this time. Although the stairwell is wide enough for a stair life to be installed later if required. You can download our Lifemark documentation below. 

EHC-11 Natural Lighting

 

AIM

To encourage and recognise dwellings that provide good levels of natural light for occupants.


CREDIT CRITERIA

Two points are available for this credit as where there is:
(1) An average daylight factor of no less than 1.5% for living areas and bedrooms, OR
(2) Window areas in external walls are no less than 20% of the floor areas for living areas and bedrooms.
as measured at the floor level under an overcast sky.

Design Rating Documentation

how the Living House does

The Living House is targeting full points for natural lighting. Please refer to the Design Rating documentation to see how we are achieving this.