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108 7 Waste heat recovery of large scale reciprocating engine (a) (b) Figure 7.12: Experimental setup under construction, a) recuperator, condenser, condensate tank and pre feed-pump and b) evaporator (Pictures by Jaakko Larjola). problems related to the availability of the fluid and high price, which appeared when the amounts of the working fluids were purchased. Later, n-pentane was also omitted from the test runs due to lack of time and resources to perform the test runs with the third fluid. However, the results obtained with isopentane are well comparable with the results ob- tained with n-pentane, since these two fluids posses comparably similar properties from the thermodynamic point of view. The main test results for full engine load with working fluids R245fa and isopentane are presented first, and they are followed by the presentation of the results with engine part load with working fluid R245fa. 7.2.2 Condensing conditions From the test results, it was observed that the condensing temperature in the condenser with R245fa is 10.5 ◦C-12.5 ◦C and with isopentane 10.2 ◦C-10.9 ◦C lower than the saturated temperature corresponding to the condenser pressure. On the other hand, with R245fa the condensing pressure is 0.76 bar-0.88 bar and with isopentane 0.40 bar-0.45 bar higher than the saturated pressure corresponding to the measured condenser temperature. This can be caused by the presence of non-condensable gases in the system, such as air or small amounts of water. These condensing pressure deviations when compared to the saturated conditions in the condenser were taken into account in the analysis of the test run results. 7.2.3 Experimental results at 100 % engine load The test runs at 100 % engine load were carried by using R245fa and isopentane as work- ing fluids. Four different evaporation pressures were used for both fluids in order to study the performance of the evaporator with different working fluid conditions. The results forPDF Image | WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES
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