| 摘要 |
PCT No. PCT/SE89/00561 Sec. 371 Date Aug. 2, 1990 Sec. 102(e) Date Aug. 2, 1990 PCT Filed Oct. 12, 1989 PCT Pub. No. WO90/04139 PCT Pub. Date Apr. 19, 1990.A heating apparatus including a burner and a heat exchanger wherein the burner supplies a primary fluid and exhaust gas to the heat exchanger. Secondary fluid supplied to the heat exchanger is first heated within the heat exchanger by the primary fluid and then is further heated within the heat exchanger by the exhaust gas. |
