Heat exchanger is one of important component in geothermal power plant, because it serves to move the heat energy between two or more fluids which have a temperature differences. This research aims to analyze the comparison of plate-frame with shell and tube heat exchanger performance in intercooler at Kamojang Geothermal Power Plant Unit 2, where the primary cooling water is used to cool the secondary cooling water. The type of Heat exchanger used in Kamojang Geothermal Power Plant Unit 2 is plate heat exchanger. However, some problems are found in this plate heat exchanger type, which is the seals that easily to leak due to the shape of gaskets that easily deformed. Moreover, if there is a problem on the plate, the plate must be replaced and can not be repaired, while the material used in this heat exchanger is titanium which has a relatively high price. With some of these problems, the effectiveness of plate heat exchanger is 30,7%. In the industrial world, the use of shell and tube type heat exchanger is generally used because the construction is relatively simple, moreover if there is a leak in the tube it can be handled by plugging. Therefore, this research will discuss the design of the calculation of shell and tube one pass shell and two tube counterflow type heat exchanger by calculation analysis of LMTD (Log Mean Temperature Difference) method. The effectiveness of design of shell and tube heat exchangers is 45.65% which means that shell and tube heat exchanger has better performance than the plate-frame type.