Exhaust-air heat pump technology has proven to be the most efficient way of recovering heat from a ventilation system. In Sweden this technology is now playing an important role in the heating market, particularly in new singly-family homes. However, larger exhaust-air heat pump systems are also being installed here, the largest unit, with a heat output of 3.4 MW, serves 2,500 flats. This article describes some of the projects that have contributed to the development of exhaust-air heat pumps in Sweden.
In view of the rapid expansion of the heat pump market in Japan, a rough calculation has been made to determine the expected impact of the increased use of heat pump air conditioners on the environment. It was found that, through the use of heat pumps, the emission rate of substances into the environment can be reduced in comparison to the use of fuel oil. To make efficient use of this characteristic, measures to prevent the release of refrigerant from heat pumps are required.
With its cool summers and ready supply of low-cost gas, the United Kingdom does not offer the most favourable economic conditions for the widespread application of heat pumps. However, environmental concerns have recently led to al1 increasing interest in heat pumps in this country. To find out more about this trend, the HPC asked EA Technology to report on the situation in the UK regarding C02 and CFC emissions, and on the impact this has on the application of heat pumps.
Since the 1992 United Nations Conference on the Environment and Development (UNCED) in Rio de Janeiro, many countries are now committed to limiting the emissions of greenhouse gases. The HPC's analysis "The Impact of heat Pumps on the Greenhouse Effect" has suggested that heat pumps can make a major contribution towards meeting this commitment, especially with regard to the reduction of Carbon dioxide emissions.
Gives a personal assessment of the most important energy utilisation techniques. Describes low-energy buildings, the building fabric, ventilation, energy saving heating systems, including oil heating, gas heating, wood-firing systems, heat pumps, co-generation, solar systems (active), heat emission and heat control; and waterheating.