Residential Tenancies (Healthy Homes Standards) Regulations 2019

h = [t + v + (f × 40) ] ÷ 1000

h

is the required heating capacity for the living room (kW)

t

is the transmission heat loss of the living room (W) calculated under clause 3

v

is the ventilation heat loss of the living room (W) calculated under clause 4

f

is the area of the floor of the living room (m²).

h = (t + v )× 1.2 ÷ 1,000

h

is the required heating capacity for the living room (kW)

t

is the transmission heat loss of the living room (W) calculated under clause 3

v

is the ventilation heat loss of the living room (W) calculated under clause 4.

t = [ d + (e × g) ] × (b − c)

t

is the transmission heat loss of the living room (W)

d

is the transmission heat loss in respect of the living room’s building elements that are part of the tenancy building’s thermal envelope (W/°C), calculated under subclause (2)

e

is the transmission heat loss in respect of the building elements that form the boundaries of the living room but are not part of the building’s thermal envelope (W/°C), calculated under subclause (3)

g

is the temperature adjustment factor for building elements that are not part of the tenancy building’s thermal envelope,—

(a)

for a modern dwelling or relevant apartment, being 0.25; or

(b)

otherwise, being 0.5

b

is the required internal temperature, being 18°C

c

is the assumed external temperature for the premises as set out in clause 5.

d

is the transmission heat loss in respect of the living room’s building elements that are part of the building’s thermal envelope (W/°C)

A_j

is the area of ceiling j (m²)

R_j

is the construction R-value of ceiling j (°Cm²/W)

j

is the numbering index for all of the living room’s ceilings that are part of the building’s thermal envelope

A_k

is the area of wall k (m²)

R_k

is the construction R-value of wall k (°Cm²/W)

k

is the numbering index for all of the living room’s walls that are part of the building’s thermal envelope

A_m

is the area of floor m (m²)

R_m

is the construction R-value of floor m (°Cm²/W)

m

is the numbering index for all of the living room’s floors that are part of the building’s thermal envelope

A_n

is the area of window n (m²)

R_n

is the construction R-value of window n (°Cm²/W)

n

is the numbering index for all of the living room’s external windows

A_p

is the area of skylight p (m²)

R_p

is the construction R-value of skylight p (°Cm²/W)

p

is the numbering index for all of the living room’s skylights.

e

is the transmission heat loss in respect of the building elements that form the boundaries of the living room but are not part of the building’s thermal envelope (W/°C)

A_q

is the area of ceiling q (m²)

R_q

is the construction R-value of ceiling q (°Cm²/W)

q

is the numbering index for all of the living room’s ceilings that are part of the boundary of the living room but are not part of the building’s thermal envelope

A_s

is the area of wall s (m²)

R_s

is the construction R-value of wall s (°Cm²/W)

s

is the numbering index for all the living room’s walls that are part of the boundary of the living room but are not part of the building’s thermal envelope

A_u

is the area of floor area u (m²)

R_u

is the construction R-value of floor area u (°Cm²/W)

u

is the numbering index for all of the living room’s floors that are part of the boundary of the living room but are not part of the building’s thermal envelope.

v = w × y × z × (b − c)

v

is the ventilation heat loss of the living room (W)

w

is the internal volume of the living room (m³)

y

is the assumed air change rate of the living room,—

(a)

for a modern dwelling or relevant apartment, being 0.5; or

(b)

otherwise, being 1.0

z

is the assumed value for the density of air multiplied by the specific heat of air, being 0.34 Wh/m³K

b

is the required internal temperature, being 18°C

c

is the assumed external temperature for the premises as set out in clause 5.