the illustrated example insert tubes 104 are kept in sets and each set is arranged in a bigger pipe referred to as a shell tube 106 the food product is fed through the insert tubes and a heat transfer medium is fed through the shell in order to keep energy consumption low it is advantageous to use outgoing product or media which is to be cooled down as the heat transfer medium such system are often referred to as regenerative systems on the sides and on the top of the tubular heat exchanger 100 side covers 101 a and top covers 101 b can be placed during service these can be be removed in order to provide for easy access fig2 and 3 illustrate by example cross sectional views of a tubular heat exchanger 200 and a tubular heat exchanger 300 respectively as illustrated each tubular heat exchanger can be designed with different tube and shell dimensions different configuration and different sizes in order to meet the needs specified e g by a food processing company in order to provide for efficient production the tubular heat exchangers can be built up in modules as example the tubular heat exchanger 200 illustrated in fig2 is built up by four modules placed in one column referred to as a 4 u00d7 1 tubular heat exchanger the tubular heat exchanger 300 illustrated in fig3 has modules placed in four columns with four modules in each of.