Gas-to-Air Heat Exchanger

Ducting with Temperature Regulator

Figure 14

If one intake system is used to supply temperature controlled air to multiple engines, provisions must be made to ensure that heated water is sent to the heat exchanger when engines are running. If engine jacket water is used, the engine that the water is taken from must be running when any of the other engines are operating. Gas-to-Air Heat Exchanger

If the use of duct work is not practical for a given installation, another option is to install a gas-toair heat exchanger, shown in Figure 15. If done correctly, this system will prevent temperature changes in the gas or the air from affecting the air-fuel ratio.

Design the system so the gas flows through the heat exchanger before entering the gas regulator. The pressure drop across the heat exchanger at full load must be added to the minimum gas supply pressure required by the engine. Design the heat exchanger to minimize both gas and air flow pressure drop while still providing enough heat transfer so that VAT stays within the given limits.

Figure 15