| 摘要 |
A high-cycle regenerative combustion system (1) has first and second regenerative heat exchanger units (11,12). A four-way valve (3) is provided for alternately bringing the heat exchanger units (11,12) into contact with a low temperature fluid and a high temperature fluid. The valve (3) is switched at a switching cycle time not longer than 60 seconds. Each heat exchanger unit (11,12) has a void ratio epsilon which substantially provides the maximum value (Q/V)max of the volumetric efficiency (Q/V). The temperature efficiency eta t is preset to be a value in a range between 0.7 and 1.0. The heat transmission coefficient h and the heat transmission area A of the heat exchanger unit (11,12) are determined such that the temperature efficiency, which is calculated in accordance with a specific equation as being a function of the heat transmission coefficient, the heat transmission area and the switching cycle time tau , falls under the preset value within the range mentioned above. Each of the first and second heat exchanger units (11,12) has the cell pitch P and the cell wall thickness b, which provide the above-mentioned values of the void ratio, heat transmission coefficient and heat transmission area. Thus, a compact and high-performance regenerative heat exchanger can be obtained, which has a reduced overall volume while exhibiting the large heat transmission rate and high temperature efficiency. <IMAGE> <IMAGE> |
