English

This BRE Report gives a guide to the use of infra-red thermography as a means to investigate the thermal properties and hidden constructional details of building envelopes. An introduction is given to infra-red thermography, the operation of the camera and the difference between photography and electronic thermography. The guide describes the aims and requirements for carrying out an infra-red survey and discusses thermal analysis and application of the results.

With electricity in Norway generated almost entirely from hydro power, government and utilities in Norway are working hard to encourage consumers to switch from fossil fuels to electricity. But, as the world's most intensive user of electricity, Norway is also taking measures to promote efficient energy systems suchas district heating and cooling using heat pumps.

Field experiences show that air-to-water heat pumps require special attention to the entire system when installed in cold climates. Generally, equipment manufacturers provide installation and start-up instruction manuals on their factory-assembled heat pumps. Most manuals describe installation methods, precautions and warnings as to unit handling for example, but they normally cover only limited information about special applications of the units. Neglect of manufacturer's instructions will often lead to such serious troubles as repeated compressor failures and insufficient heating.