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Normative Values of Heat Transmittance Coefficients

URNW/(m2 x K) and RN, W/(m x K)

Heat

transmission coefficients

Type of building

Envelope

Roofs and external coverings

Floors on the ground

W/(m2 x K)

URN,

Walls: - with mass less than 100 kg/m2

- with mass 100 kg/m2 and more

Windows, doors and glazed walls

RN,

W/(m x K)

Thermal bridges

k – temperature factor.

National legislation does not include precise energy efficiency values therefore it can be calculated taking into account several factors. For residential houses, homes for the elderly, hospitals and kindergartens the normative value HTR may be determined in accordance with formula HTR= hAA , where hA − the calculated heat loss coefficient of one square meter of a

building W/(m2 × K), residential house.

A – the sum of floor areas to be heated on all storeys (m2) of a

For buildings with various numbers of storeys the value HTR shall be determined for each part of the building separately.

For residential houses, homes for the elderly, hospitals and kindergartens the specific heat consumption hA of one square meter for one-storey and two-storey buildings shall be respectively 1.10 (W/m2 x K ), for three- storey and four-storey buildings – 0.9 (W/m2 x K), for five-storey and higher-storey buildings – 0.7 ( W/m2 x K).

The calculated heat loss coefficient HT of a building may not exceed the normative value HTR .

The designer is responsible for complying with the national requirements. Municipality Construction Inspection controls the construction process according to requirements.

The control mechanism of the building energy efficiency process is not in place yet.

Additional requirements covered in the law approved in March 2008 are still under discussion. In Latvia, the summer cooling requirements are not subject to legislative restrictions.

In the near future we expect the volume of renovated buildings will increase because of several supportive (financial and informational) actions in the housing sector are due to adopted into the national energy efficiency action plan.

EPBD Buildings Platform > P128_EN_Latvia_July2008

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Residential, pensions,

hospitals and kindergartens

0,2 k 0,25 k 0,25 k 0,3 k 1,8 k 0,2 k

Public, excl. pensions,

hospitals and kindergartens

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