Abstract: A cast cylinder head 1 of an internal combustion engine to be mounted on a vehicle has an intake-side side wall 2i, an exhaust-side side wall 2e, and opposite end walls 3r and 3f. The walls 2i, 2e, 3r and 3f define a water jacket 8. A first cooling water exit part 11 and a second cooling water exit part 21 both having a solid structure are formed by casting integrally with one of the intake-side side wall 2i and the exhaust-side side wall 2e and with one of the end walls 3r and 3f, respectively. Cooling water exit openings 15,16 or 25,26 opening into the water jacket 8 are drilled selectively in either of the first cooling water exit part 11 and the second cooling water exit part 21 depending on the engine mounting position on the vehicle. Thus the same cylinder head can be used independently of the mounting orientation of the engine on the vehicle.

Abstract: Mounting port, provided adjacent to a cooling water passageway, has a hole opening from the passageway for mounting an anode metal in the passageway. Lid member, which closes the outer end of the hole, has a head portion formed at its outer end and an externally threaded portion engageable with an internally threaded portion of the hole with a sealing member sandwiched therebetween. The lid member having the anode metal fixed thereto is inserted in and attached to the port with the threaded portions engaging with each other with a sealing tape sandwiched therebetween. Space is defined between an outer end portion of the port and an outer end portion of the lid member between the head portion and the externally threaded portion so that part of the sealing member protruding from between the threaded portions can be received in the space.

Abstract: A heat exchanging device (10) and method for boosting fuel economy in the internal combustion engines of motor vehicles uses a shell and tube structure whereby that portion of the fuel line, i.e. an inner structure (20), that is downstream from the fuel line filter (204), the fuel pump (202) and the fuel tank (200), and upstream from the fuel injector (206) or carburetor, is placed in heat-exchanging relationship with a portion of the cooling system, i.e. an outer structure (40), that is downstream from the engine block (102) and upstream of the heater core (114) of the motor vehicle.

Abstract: The invention is an internal combustion engine converting the fuel/air mixture (17) to energy, comprising at least one engine having at least one engine cover (2), at least one external piston (5) having geared rotary ducts and providing the combustion and compression volumes inside said engine body (1), having fuel/air mixture (17) and exhaust gas (18) discharge openings (4.1), one internal piston (7) which rotates inside said internal piston space (6) and compresses the fuel/air mixture (17) sucked in through the suction opening (6.1) behind it and pumps this into the external piston inner space (4) and an external piston (5) rotating in the opposite direction.

Abstract: A high-altitude aircraft powerplant including an engine, a two-stage turbocharger having an intercooler and an aftercooler, a cryogenic hydrogen fuel source, and a cooling system including a hydrogen heat exchanger. Aided by a ram-air cooler that cools a coolant to a near-ambient temperature, the heat exchanger is configured to heat the hydrogen using the coolant, and to cool the coolant to a temperature well below the ambient temperature during high-altitude flight. The intercooler and aftercooler use the sub-ambient temperature coolant, as does a separate sensor. The ram-air cooler includes a front portion and a rear portion. The cooling system includes three cooling loops which respectively incorporate only the front portion, only the rear portion, and both portions of the ram-air cooler.

Abstract: A coolant flow measurement device includes a coolant flow circuit, a cooling system, a purge system, a variable speed fluid pump, a differential pressure gage and a primary flow meter. The coolant flow circuit may be attached to a an HVAC system of the vehicle such that coolant may be circulated through the HVAC system of the vehicle. The cooling system may cool the coolant in the coolant flow circuit. The purge system may be used to purge air from the coolant flow circuit. The variable speed fluid pump may be operable to balance the fluid pressure between the device inlet and the device outlet. The primary flow meter may be operable to measure the coolant flow in the coolant flow circuit. The differential pressure gage measures a pressure differential between the device inlet and the device outlet.

Abstract: The present invention provides an engine which can easily cool oil within an oil circulation path The oil circulation path includes an oil reservoir, an oil pump for sucking oil from the oil reservoir so as to pressurize, an oil supplying oil passage conducting the oil from the oil pump to each of lubrication points, and an oil returning oil passage for returning the oil to the oil reservoir from the lubrication points. The cooling fluid path includes a cooling fluid pump, and a cooling fluid passage for supplying the cooling fluid, which conducts the cooling fluid from the cooling fluid pump to the cooling points. The oil passage and the cooling fluid passage come into contact with each other at one or more points of the engine main body so as to be heat exchangeable via a partition wall.

Abstract: The invention relates to an apparatus for liquid cooling of an internal combustion engine (11) and a process for producing it. The apparatus of the invention comprises a cooling circuit (13) which comprises at least one cooling channel (23, 24, 41) for a liquid coolant which is in thermal contact with at least one component (12a, 12b, 31) of the internal combustion engine (11), wherein a wall of the cooling channel (23, 24, 41) which comes into contact with the coolant has a microstructured surface having a certain porosity and roughness at least in a subregion. According to the invention, such an apparatus is produced by constructing a cooling circuit for a liquid coolant which has cooling channels which can at least partly be brought into thermal contact with the internal combustion engine, wherein a microstructured surface is produced on at least part of the walls of the cooling channels which come into contact with the liquid coolant.

Abstract: A cooling system for an internal combustion engine incorporating a heat accumulator to temporarily store heat during peak heat loads. In automotive vehicles, the heat accumulator may store excess heat generated during vehicle acceleration or hill climbing and it may dissipate stored heat during vehicle cruise, deceleration, or engine idle. The heat accumulator contains phase change material with a solid-to-liquid transition temperature higher than the normal operating temperature of the cooling system. The invention enables reducing the size and weight of engine cooling system without compromising its performance. This is particularly important for improving fuel economy and reduction of emission in automotive vehicles. In addition, the invention enables reducing the coolant inventory in the system thereby allowing for faster engine warm-up and reduced emissions of harmful pollutants during a cold engine start.

Abstract: An integrated hybrid heat exchanger with a multi-sectional structure, may include a first radiator and a second radiator, and/or at least a coolant bypass member disposed between the first and second radiators, the coolant bypass member connecting one end portion of the first radiator and the other end portion of the second radiator so as to fluid-communicate between the first radiator and the second radiator.

Abstract: A liquid to liquid heat exchanger for a marine engine cooling system disposes a tube bundle within a non-metallic shell, provides a thermostat within an integral portion of the shell, uses bolts that both push and pull respective end caps when rotated, and in one embodiment provides an integral deaeration reservoir to remove entrained gases from a liquid of a closed cooling system.

Abstract: A system is provided that draws heat from an open-loop engine cycle into a closed-loop working fluid circulatory system that utilizes computer-aided feedback mechanisms. The closed-loop working fluid draws engine heat from multiple sources: exhaust stack gases, the engine block, the engine transmission, and the engine headers and exhaust manifold near the valves. Heat exchangers are arranged in an ascending pattern according to the temperature of the heat at each heat generating location of the open-loop engine cycle. A wankel or similar type engine receives the heated working fluid and rotates a shaft connected to a generator to generate electricity. An electrolysis unit is powered by the generated electricity and separates water into hydrogen and oxygen. A reformation unit receives fuel such as diesel and the generated hydrogen to reform the fuel prior to injection into the engine for combustion.

Abstract: A system and method for removing gases from an engine coolant system. In one embodiment, the system includes a fluid system that is operable to collects gas, and a gas collection system coupled to the fluid system. The system also includes a venturi pump system coupled to the fluid system and to the collection system, where the venturi pump system is operable to extract the gas from the fluid system via the collection system.

Abstract: An engine assembly may include a cylinder head defining an engine coolant reservoir, a pressurized fluid supply, a valve actuation assembly, and a hydraulic fluid reservoir. The valve actuation assembly may be in fluid communication with the pressurized fluid supply and may include a valve member displaceable by a force applied by the pressurized fluid supply. The hydraulic fluid reservoir may be in fluid communication with the valve actuation assembly and in a heat exchange relation to the engine coolant reservoir.

Abstract: The invention relates to a circuit (NK) for cooling charge air (LL) in a motor vehicle comprising a turbocharger that is provided with a circulating pump (5) for the circuit (NK). Said pump (5) is coupled to a turbine (2) and forms a turbine/pump combination (1) along with the turbine (2).

Abstract: A cogeneration system is disclosed. The system has a cooling water circulation channel for returning cooling water of the engine to the engine after some of the cooling water has been removed. The cooling water circulation channel is provided with a cooling water pump for pressure-feeding the cooling water; electricity supplying means; and a control part for performing a control so that electrical energy is supplied from the electricity supplying means to a motor for driving the cooling water pump when a power outage signal is received.

Abstract: A cooling arrangement for a vehicle which is powered by a combustion engine. The cooling arrangement includes an air passage through which air flows in a specific direction, and at least three cooling elements to effect cooling of a medium. The three cooling elements are arranged one after another in the air passage such that at least part of the air which flows through the air passage flows successively through all of the cooling elements and cools the media in the respective cooling elements. The cooling elements are arranged one after another in the air passage in a sequence which is related to the temperature of the media in the respective cooling elements such that the air which flows through the cooling elements in the air passage cools a succession of media, each media in succession is at a higher temperature than the one preceding it.

Abstract: A expansion tank for an engine cooling system comprises a housing forming a main chamber and a swirl chamber, the swirl chamber being defined by a cylindrical wall. An inlet connection discharges through an inlet orifice towards a collector duct having an entrance. From the inlet orifice the coolant is directed as a stream or jet along the adjacent surface of the cylindrical wall towards the entrance of the collector duct, guided by circumferential ribs. The kinetic energy of the stream is converted into pressure energy so that the pressure delivered from the outlet connection is slightly above the pressure at the top of the swirl chamber, above the level of liquid. This swirl chamber pressure is set by the relief pressure allowed by a filler cap, the gain in pressure helping to avoid cavitation in a coolant circulation pump.

Abstract: To increase the wind volume of the cooling wind flowing through a radiator and to enhance the cooling performance of the radiator by providing a wind exhaust duct using a crankcase of an internal combustion engine. A cooling device of the internal combustion engine includes a radiator arranged lateral to crankcases. A wind exhaust duct exhausts the cooling wind passed through the radiator to the atmosphere. The wind exhaust duct is extends along a rotational axis of the crankshaft at the upper portion of the crankcases and the upper portion of the transmission case.

Abstract: A water temperature controller includes a first body with a first connecting portion, and a second body with a second connecting portion. The connecting portions are slidably connected in a longitudinal direction. The first connecting portion may be at least partially disposed within the second connecting portion. An O-ring may be provided between the connecting portions. The first and/or second body may be made of plastic.

Abstract: A system (30) and method for removing heat from a confined space such as from engine compartment or service brake of a motor vehicle where heat is generated by operation of a heat engine (12) that propels the vehicle or application of a friction brake. The system and method do not use engine or electrical power because natural aspiration is used to remove heated air and Curie Temperature of a ferromagnetic material is used to selectively allow and disallow natural aspiration.

Abstract: The invention relates to a device for guiding media in a cylinder block and crankcase of a reciprocating piston in-line combustion engine having a number of cylinders. To this end, the media guide comprises, among other things, at least one cross-channel that leads from one longitudinal side to the other longitudinal side of the cylinder block and crankcase. A structurally advantageous and simple design is provided by virtue of the fact that the cross-channel runs inside a free space, which is formed by recesses of two adjacent pistons in the lower area of the piston skirts and above the crankshaft bearing of the combustion engine.

Abstract: A vehicle energy management system including a vehicle engine crankshaft mounted generator as well as single function heat exchangers, with each of the single function heat exchangers associated with a corresponding electric fan. The electric fans are controlled to sequentially energize to avoid overloading the generator.

Abstract: A cooling system for a marine propulsion device incorporates both a closed portion and an open portion. The closed portion is operated to encourage nucleate boiling and is provided with a pump and a valve in order to regulate the rate of flow of coolant through certain heat emitting regions of the engine. The pump can be an electric variable speed pump and the valve can be used to direct coolant through a heat exchanger or to bypass the coolant around the heat exchanger.

Abstract: On the front surface side of a cooler, a filter mounting portion provided with a filter abutment surface with which a filter is brought into abutment from the front side of the filter mounting portion is provided. The front end side of the filter pushed in from a maintenance port is pressed onto an elastic body formed of a plate spring and provided in the filter mounting portion. Thereby, by a pressing force F1 serving as a component force of a restoring force F of the elastic body, the filter is pressed onto the filter abutment surface, and by a position fixing force F2, the filter is pushed rearwards so as to ensure an engagement state of an engaging claw and an engaging hole.

Abstract: A method of estimating temperature in an engine including estimating metal temperatures at each of a plurality of nodes and estimating a coolant temperature. The method further includes detecting a measured coolant temperature and determining a gain based on a difference between the estimated coolant temperature and the measured coolant temperature. The method adjusts the metal temperatures at each of the plurality of nodes based on the gain. The method estimates the metal temperatures of engine components without temperature sensors.

Abstract: The invention relates to a method and a device for cooling an internal combustion engine. An aqueous, non-ionic coolant composition is used in a cooling circuit (14) of the internal combustion engine (11). In order to also ensure long-lasting protection against corrosion for light metal components of the engine that come into contact with the coolant, e.g. components made of magnesium or magnesium alloys, the cooling circuit has at least one deionization device (28), for example, an ion exchanger, for the coolant.

Abstract: In response to simultaneous ON settings of a heater switch signal HSW and an eco switch signal ESW, an eco priority map is set to an intermittent operation permission map (step S350). The heater switch signal HSW is output from a heater switch that is operated to warm up a passenger compartment, while the eco switch signal ESW is output from an eco switch that is operated to give preference to improvement in fuel consumption of the vehicle over the heater function. The eco priority map is designed to allow intermittent operation of an engine in a lower range of cooling water temperature Tw of the engine than that in a heater-on state map set in response to OFF setting of the eco switch signal ESW and ON setting of the heater switch signal HSW.

Abstract: A cooling system for a marine propulsion device provides a bypass loop around a cooling pump that allows the flow of cooling water through certain components to be reduced or increased as a function of the temperature of those components while causing a full flow of cooling water to flow through other selected heat emitting devices. Using this configuration of components and bypass conduits, the operating condition of the cooling water pump can be continually monitored, including the condition of its flexible vanes. By observing the effective cooling capacity of the system under conditions with the bypass valve open and closed, the effectiveness of the cooling water pump can be assessed and a suggestion of maintenance can be provided.

Abstract: An air separator for low flow rate coolant systems which removes air from the liquid coolant thereof. The air separator is a closed canister having a bottom wall, a top wall at a gravitationally high location with respect to the bottom wall, and a sidewall sealingly therebetween. A coolant inlet is at the sidewall, a pump outlet is at the bottom wall and a coolant reservoir outlet is at the top wall. The coolant reservoir outlet is connected to a coolant reservoir gravitationally elevated with respect to the canister. A much larger cross-sectional area per unit length of the canister relative to the piping results in a coolant dwell time in the canister that encourages coolant air bubbles to migrate toward the coolant reservoir.

Abstract: A double pipe heat exchanger that can be produced easily and can be used as a part of piping by bending the whole body, wherein an inner pipe is configured so that: a plurality of balloon-shaped bulges communicating with one another and extending from the center toward the radial directions in a cross section orthogonal to the axis line thereof may be formed; the outer circumference of the bulges may be bent into the shape of waves in an axial cross section; and the top portions of the waves may touch the inner surface of an outer pipe. Then in the state, the whole body including the inner pipe and the outer pipe is bent by applying external force.

Abstract: A cooling system for a marine propulsion device provides a bypass loop around a cooling pump that allows the flow of cooling water through certain components to be reduced or increased as a function of the temperature of those components while causing a full flow of cooling water to flow through other selected heat emitting devices. Using this configuration of components and bypass conduits, the operating condition of the cooling water pump can be continually monitored, including the condition of its flexible vanes. By observing the effective cooling capacity of the system under conditions with the bypass valve open and closed, the effectiveness of the cooling water pump can be assessed and a suggestion of maintenance can be provided.

Abstract: A cylinder head cooling structure and an oil temperature control system are provided for an internal combustion engine having a plurality of cylinders, each having a plurality of intake ports and a plurality of exhaust ports. The engine includes cooling oil jackets surrounding the spark plugs in the cylinder head, a thermostat attached to the front surface of the crankcase independently of an oil filter, and an oil temperature sensor disposed on a rear face of the cylinder block above the crankcase in an oil supply path formed on the cylinder rear face for supplying oil to the oil jackets. Oil passages conducting oil into the oil jacket are provided between two separate parts of a bifucated intake port and between two separate parts of a bifurcated exhaust port, and only cooling system oil reaching high temperatures is allowed to flow through the thermostat, thereby improving temperature control response.

Abstract: A cooling system is provided for a vehicle having an engine. The cooling system includes a pair of heat exchangers, such as an oil cooler and a charge air cooler, laterally spaced apart from each other and located in front of a front end of the engine. A pair of blower units are in front of the coolers and blow cooling air rearwardly therethrough. A pair of duct units are located above the engine and to the rear of the coolers. Each duct unit includes a forward opening inlet receiving warmed air from the corresponding cooler, an upwardly opening outlet and a hollow housing extending from the inlet to the outlet. The outlets are spaced laterally apart from each other. A radiator is positioned above the duct unit housings and forward of the outlets. A set of radiator fans blow air upwardly through the radiator and are positioned between the radiator and the duct housings.

Abstract: The invention relates to a circuit arrangement (K) comprising a low-temperature circuit (NK) for cooling charge air (13) that is fed to a motor (8) in a motor vehicle equipped with a turbocharger. According to the invention, the charge air (13) is compressed in two stages in a first low-pressure turbocharger (1) and a second high-pressure turbocharger (2). To cool the charge air (13) a first cooler (3) is provided downstream of the low-pressure turbocharger (1) and upstream of the high-pressure turbocharger (2) and a second cooler (4) is provided downstream of the high-pressure turbocharger (2) and upstream of the motor (8). The invention also relates to a method for operating a circuit arrangement (K) of this type.

Abstract: Disclosed embodiments of proposed hydrogen-oxygen and hydrogen-air engines are usable in automotive, power-producing, chemical and other industries. The engines comprise cylinders; water dissociation means, including thermo-impact transformers and possibly electrolyzers; ionic dividers separating hydrogen and oxygen ions; injection means configured to inject hydrogen and oxygen/air doses in response to an operator's action and according to proposed dosing methods accounting a hydrogen-oxygen optimal ratio suitable for an explosive plasma reaction in the cylinders, increasing engines torque, eliminating/reducing pollutions. Determination of optimal ratios for hydrogen-air mixtures is also discussed. The dosing methods include algorithms for computing termination injection pressures for hydrogen-oxygen/air doses. Different hydrogen-oxygen/air delivery system are described in conjunction with modified dosing methods.

Abstract: The invention relates to a cooling module for an engine (1) of a motor vehicle. Said cooling module comprises a heat exchanger (4), at least one fan (16) and a coolant pump (8), whereby a modular frame (3) forms an integral part of the cooling module (2) and the coolant pump (8) is disposed within and/or on said modular frame.

Abstract: A machine includes an electrical power source, which may include a mechanical power source and an electric generator drivingly connected to the mechanical power source. The machine may also include one or more power loads connected to the electric generator. Additionally, the machine may include power-supply controls, which may be configured to execute a control method. The control method may include receiving inputs relating to conditions of operation of the machine. Additionally, the control method may include controlling the speed at which the mechanical power source drives the electric generator, and the power consumption of one or more of the power loads connected to the electric generator, interdependently.

Abstract: An internal combustion engine that includes individually-cooled cylinder assemblies. Direct raw-water cooling is provided for the engine's intercooler, oil cooler, and heat exchanger, which is used for the purpose of cooling a fresh water coolant circulating individually through each of the engines' separate cylinders.

Abstract: An internal combustion engine that includes individual, liquid-cooled, cylinder assemblies mounted separately to a common cylinder carrier. A modular cylinder carrier that is assembled from separate cylinder mounting modules and main bearing bulkheads.

Abstract: A waste heat recovery system for a split-cycle engine includes a heat exchange unit. An air compressor device is in communication with the heat exchange unit. A waste heat input receives waste heat from the engine and is in fluid communication with the heat exchange unit. An ambient air intake connected to the air compressor device draws air into the air compressor device. A compressed air outlet member on the air compressor device in fluid communication with a compression cylinder of the split-cycle engine delivers compressed air from the air compressor device to the engine. Engine waste heat is communicated to the heat exchange unit and energy from the waste heat is used to drive the air compressor device, causing the air compressor device to draw in ambient air through the ambient air intake, compress the ambient air, and deliver compressed air to the engine through the compressed air outlet.

Abstract: In accordance with an embodiment of the present invention, a method of controlling an internal combustion engine system having an internal combustion engine is disclosed. The internal combustion engine includes an engine block defining a plurality of combustion chambers, an intake air system in fluid communication with the combustion chambers and providing intake air thereto, an exhaust gas system in fluid communication with the combustion chambers and carrying exhaust gas therefrom, a cooling system having a cooling fluid circulated therein and a recirculated gas system in fluid communication with the exhaust gas system and intake air system wherein a portion of the exhaust gas is routed from the exhaust gas system to the intake air system.

Abstract: A method for operating an internal combustion engine is provided. By taking into account a setpoint temperature Tsetpoint of the internal combustion engine which depends on external and internal boundary conditions when controlling and/or regulating temperature-dependent functions of the internal combustion engine, fuel consumption and emission characteristics of the internal combustion engine are improved.

Abstract: A heat exchanger, which performs heat exchanging between a lubricating oil circulating within a transfer device disposed behind an engine and an engine coolant, also functions as a mass member of a dynamic damper. The heat exchanger is disposed at an upper face of a transfer case via a resilient member. Herein, the resilient member is comprised of a first metal plate, a second metal plate, and a rubber member interposed between the first and second metal plates, and there are provided lubricating passages flowing within the resilient member. Accordingly, there can be provided the vibration suppression device of the power train that can suppress vibration properly regardless of the temperature changing and advantage the weight reduction without requiring any new disposition space.

Abstract: An internal combustion engine performing its cooling by means of coolant and being capable of detecting a temperature of the coolant accurately is to be provided. In this engine, there is mounted a water outlet 3 provided with a temperature detecting means 9 for detecting a temperature of the coolant after cooling the engine, and with a rib 7 and an upslope surface 8 both of which are capable of guiding the coolant to a temperature detecting portion 9a of the temperature detecting means 9.

Abstract: A control valve suitable for forming part of a cooling circuit comprising a first branch which contains a radiator and a second branch that constitutes a bypass of a radiator is described. The control valve has a third branch, which, in a motor vehicle combustion engine cooling circuit, has at least one unit heater for heating the vehicle cabin.

Abstract: A system includes a control switch mounted in a tractor cabin and is electrically mated to a power source of the tractor. A first coolant is housed within the tractor's engine and a second coolant is housed within a trailer's heating system. The first and second coolants have unique boiling and freezing temperatures respectively. A mechanism is included for simultaneously transferring heat from the first coolant to the second coolant while maintaining the coolants isolated. The first and second coolants have first temperatures entering and second temperatures exiting the heat transferring mechanism, respectively. The first coolant second temperature is lower than the second coolant second temperature. Mechanism are included for controlling an input flow rate of the second coolant upstream from the heat transfer mechanism and for replenishing the second coolant as heat is transferred between the first and second coolants.

Abstract: An anti-explosion and anti-fire system is disclosed, the system comprising an encapsulant disposed to cover high temperature surface portions of a component; a conduit in thermal connection with the encapsulant; and a heat transfer fluid disposed within the conduit. A diesel engine is disclosed for an underground mine, the engine comprising an encapsulant disposed to cover high temperature surface portions of a cylinder head; a conduit in thermal connection with the encapsulant; and a heat transfer fluid disposed within the conduit. A method for encapsulating high temperature surface portions of a cylinder head is disclosed, the method comprising positioning a conduit adjacent the head; positioning an encapsulant in thermal connection with the head and the conduit; and transferring heat from high temperature portions to prevent gasses, coal dust, fuel, oils or other combustible material in an underground mine from contacting portions at temperatures above an explosion or fire safety limit.

Abstract: A coolant system includes a heat exchange circuit capable of being in a heat exchange relationship with a heat generating component, such as an engine, to remove thermal energy from the engine and transfer the thermal energy to a coolant, and an insulated tank in fluid communication with the heat exchange circuit. The system also includes a control and associated conduits and valves for passing coolant through the heat exchange circuit and the insulated tank so as to fill the tank with a first volume of coolant in a first operational state, for passing an additional amount of coolant from the heat exchange circuit into the insulated tank so as to fill the insulated tank with a second volume of coolant which is greater than the first volume of coolant in a second operational state, and for passing the additional amount of coolant from the insulated tank to the heat exchange circuit in a third operational state. A method of operating the coolant system to store thermal energy is also provided.

Abstract: A cooling system and method of cooling an engine are disclosed. The cooling system includes a first closed loop that circulates coolant at a first temperature and a second closed loop that circulates coolant at a second temperature that is different than the first temperature. Such a construction provides two separate cooling temperature circuits for cooling equipment at different cooling temperatures.