Abstract
The practical and economic aspects of heat recovery from a full-scale aerobic waste lagoon are considered. The heat recovery system consists of a water to water heat pump, of 21·6 kW output delivering the heat into pig farrowing accommodation on a commercial farm. The aerobic lagoon maintains a temperature of 35°C, summer and winter, and the heat pump delivers hot water at 55°C to a radiator heating system. The performance of the system was monitored for one year and an assessment is made of the likely costs and benefits for this particular farm. If the waste system is installed to provide some degree of treatment and to control odour, then the capital and running costs need not be debited to the heat recovery system. In this circumstance, the additional costs of the heat pump and heat exchanger may be recovered in 3–4 years.
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