Use of the enthalpy of sewage stream for heat production on an example of sewage treatment plant in Kety [Poland]
2008
Szul, T.,Uniwersytet Rolniczy, Krakow (Poland). Katedra Energetyki Rolniczej
The paper analyses the purposefulness of waste heat from treated sewage utilization by means of heat pumps to satisfy the heating needs of medium sized sewage treatment plant facilities. The buildings, situated in the area of the sewage treatment plant, are characterized by thermal power requirements for heating and preparation of warm usable water (cwu) on the level of 123 kW. At present these requirements are fulfilled totally by burning natural gas of which about 44 thous. cubic m is used up during the heating season. Annual expenditure for this purpose reaches almost 64 thous. zloties. The paper discussed four variants of heat pump use in the treatment plant facilities, which are capable of fulfilling heat needs to a different degree. Application of heat pumps in the heating system allows to satisfy the heat needs to between ca. 10 percent and almost 85 percent, depending on the adopted variant. Annual savings of the treatment plant due to application of heat pumps for heating its buildings may range from 12 percent to c.a. 60 percent depending on the applied variant
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