The object of this invention is a method to arrange cooling air / combustion air for a motor in warm inside space, like for a combustion engine or electric motor. With the help of this method, a sufficient amount of combustion air / cooling air is conducted for its need for an engine that is located indoors.
The usage places for the invention are vehicles that are equipped with a combustion engine and other engines and electric motors indoors, like in garages, storage spaces for vehicles, engine halls, power stations etc. Very useful objects for the invention are the lorries, busses, trailer truck prime movers and different power tools like for instance wheel loaders, fork lift trucks etc. The large electric motors are also advantageous places to use the invention. The more combustion air or cooling air is needed the more useful it is for the use of the invention. Especially, the cold start of the before mentioned engines is a situation where the method according to the invention gives great advantage. When the engine is considerably cooler than the ordinary usage temperature (room temperature) its running speed is greater than the idle running. The starting of more than one of this kind of engines at the same time for instance in the morning is a very useful situation to use the invention. The usage of the invention is the more useful the greater the difference between the inside and outdoor temperature is.
The electric motors are useful places to use the invention because they need cooling air during their run.
The combustion engines in the situations and places that have been mentioned before are started and operated nowadays so that the engine takes the combustion air directly from the warm room space. When an engine is started its air intake system sucks the room air near it to be used in the engine and then the substitute air to this space comes through all the possible gaps and openings. The open doors between the rooms and the gaps in the closed doors work as the flow routes for the air and thus heated indoor air comes even from a long distance inside the same building.
As we know that an ordinary lorry / truck prime mover turbocharged engine uses after its cold start during the greater than ordinary idle run air about 20 - 40 m3
/min, so three this kind of engines use during 5 minutes about 300 - 600 m3
air. In practise, in this kind of situation air comes also through the gaps in the exterior walls but the greatest part of this kind of air is heated indoor air. If the situation that has been described is formed indoors with the dimension of about 10 m x 10 m x 4 m, the amount of the air that flows to the engines during that 5 minutes is even 1.5 times that whole volume.
Large electric motors require great amounts of air for cooling during their run. In the known technique, this air is taken from room air.
The before mentioned known technique is used commonly also in the air intake for combustion and cooling of the turbocharged engines of big volume (11 - 18 litres) and for cooling of electric motors.
When using the known technique major disadvantages occur. In the case of the combustion engines the greatest drawback can be seen to be the great energy usage they cause. In the northern countries, like for example Finland, a great part of the year it is so cold that the buildings need to be heated. As the heated room inside air and in many cased the neighbour room heated air flows to the combustion engines so that the substitute air during the cold periods of the year is cold outdoor air. The lost warmth energy means quite big costs because the rooms must be reheated.
Another clear drawback in the use of the known technique is that it causes air draught between the rooms. This drawback is encountered both in the case of the combustion engines and the electric motors. For instance there is a draught in the neighbouring of-fice room. The draught weakens the comfort of the room and is also in many cases a health hazard. It is also a quite clear drawback that the office temperature goes down. If this kind of situation occurs repeatedly for instance every workday morning the situation can be very hard to tolerate and unhealthy for the people who work there.
The intension of this invention is to obtain a method to arrange such a combustion air / cooling air for the warm inside room located engine or motor that the drawbacks of the known technique can be avoided. It is characterizing for the solution according to the invention what has been stated in the characterizing part of the claims.
In the same way, as the known technique has drawbacks and hindrances the usage of the method of the invention has many advantages. The greatest advantage in comparison to the known technique is the saving of the energy. Once heated room temperature can be kept warm with a normal warming power and there is no need for another raise in the temperature of the room by directing heating to the cold substitute air. From the earlier stated example concerning combustion engines it can be derived that the amount of saved energy in that case is what is needed to heat about 400 m3
of air to the desired room temperature. The amount of the raise of the temperature and thus the loss of energy depends on the outdoor temperature.
The invention is described in more detail in the enclosed drawings where
fig 1, presents a typical known technique method diagrammatically taking the combustion air for a lorry engine that is indoors,
fig 2, is a diagrammatic presentation of using the method according to the invention in the before mentioned situation.
In fig 1 there is a building 1 with two heated indoor spaces that are separated from each other by a partition wall 4, in other words the first and the second indoor space 2, 3. The first indoor space 2 is a room or a hall where a lorry 6 is kept and another indoor space 3 that is limited to it is an office room. There is a door 5 in the partition wall between these rooms. In the larger part of the building there are large entrance doors 1.1 and windows 1.4. When the combustion engines 7 of the lorries 6 are started in a cold morning using a method of the known technique, a warm air flow 9 from the first warm indoor space commences to get to the air intake equipment 8 e.g. air cleaner. At the same time, the suction of air to the engines 7 reaches also the other indoor space 3 and the heated air 9 of that space starts to flow through the partition wall 4 holes and gaps into the engines of the lorries. A vacuum that is created in the indoor spaces 2, 3 produces the substitute air flow 10 from outdoors to indoors through the substitute air velvets and the openings of the doors and the windows. The lorry engines consume during few minutes altogether or the greatest part of the warm air of the indoor spaces 2, 3 and cold substitute air flows from outdoors into indoors. The temperature of the indoor spaces goes down as the warmth energy of the indoor spaces moves to the engines 7. The cold air that comes in causes draught near the floor and even higher. The vacuum effect that the engines cause indoors can reach quite long and over numerous doors in which case the draught can bother a big multitude of people who are in the building 1.
Following is a description of the use of the method according to the invention in the before mentioned circumstances referring to the fig 2.
Near to the air intake equipment 8 of the engines of the lorries 6 there is a case like air intake box 11 that is open in the side of the engine and from this box an air channel 12 is led through a lead-out 1.5 in the wall of the first space 2 into outdoors. When the lorry engines 7 are started they get the major part of the combustion air 13 from outdoors through the air channel 12 and the air intake box 11. This method ensures that the warm air of the indoor spaces 2, 3 does not go into the engines and thus there will not be substitute air flow caused by a vacuum and there will not be temperature fall and draught either.
The method according to the invention can also be made using different kinds of air intake organs 11 and air channels 12. The tighter the air intake box is installed to the engine air intake the better it can be avoided that the air gets mixed with the air that comes from the room and the total advantage is that much greater. A gasket 14 can be used to help to install the air intake box 11 tightly to the air intake equipment 8.
The air channel 12 can be a unanimous channel or for example a combination of more than one hoses. It is central for this matter that the flow area coming to the engine 7 is of a suitable size. It can be dimensioned so that there will not be trouble of noise and on the other hand the production costs are reasonable.
The air intake box 11 can in some cases be also a part of the end of the air channel 12. In this case, it can be formed favourably so that it is fit for its use that is to say to conduct air to the air intake equipment 8. The air intake box 11 can also be equipped with the support elements, in which case it can be supported to its place during the use. As an example of this the following can be mentioned: A support rod construction from it to the indoor 2 floor that can also be equipped with wheels to make the moving easy. As another example it can be mentioned a support construction by hanging
When the method according to the invention is used for the electric motors, an air intake box 11 is installed permanently near to the motor cooling air intake opening or it is moved there and the outdoor air is led there through the air channel 12 while the motor is running. This air flows through the motor and is released to the room air and thus the vacuum in the room is prevented and so there will not be any draught.
The method according to the invention can be used widely in connection of the vehicles, engines and electric motors. The larger the warm space is and the volume of the combustion engines is the more advantage is obtained by using the invention. The air intake equipment 8 can also be situated somewhere else than what is presented in fig 1 and fig 2. As an example of this kind or arrangement, an air intake opening at the end of a separate channel can be mentioned
Both combustion engine and electric motor air intake using the method according to the invention can be made more efficient by suction in the channel and/or by using a fan. In this case, the suction fan/fan is installed in the air channel 12 or in connection of it favorably for its operation so that the air flow coming to the motor gets more efficient. This kind of suction fan/fan can be installed to the channels of every motor or into a greater channel that is divided later (in the flow direction) into smaller channels.
In new construction of a building a net of air channels 12 can be made in the building phase so that outside air can be supplied at the same time into numerous engines and motors. This kind of air channel net or a singular air channel 12 can also naturally be made in an existing building.
It should be noted that even though this explanation pertains to one kind of solution example that is favorable for the invention, this does not in any way limit the use of the invention only in this kind of solution, instead, many variations are possible within the inventive idea that has been defined in the claims.
1. A method to arrange combustion air for an engine in warm indoor space, like a combustion engine or an electric motor characterized in that in accordance to this method the air intake equipment (8) of a combustion engine (7) to be started or that has been started or in connection of the air intake equipment of the cooling air for an electric motor, immediately close to them is arranged at least one air intake box (11) whereto is fixed or will be fixed an air channel (12) that reaches the outdoor air so that the outdoor air flows through the air channel (12) to the air intake box (11) and from there further to the air intake equipment (8) of the combustion engine (7) or to the cooling air intake of an electric motor.
2. A method according to the claim 1 characterized in that a gasket (14) is used between the air intake box (11) and the air intake equipment (8) to improve tightness between them.
3. A method according to the claim 1 or 2 characterized in that the air intake box (11) that is used there is a part of the end of the air channel (12).
4. A method according to some of the claims 1 - 3 characterized in that a support construction is used to support the air intake box (11).
5. A method according to some of the claims 1 - 4 characterized in that it is used to the air intake/cooling air intake of a combustion engine (7) of a lorry, trailer lorry or bus or poer machine or the cooling air intake of an electric motor
6. A method according to some of the claims 1 - 5 characterized in that with the help of it outdoor air is taken for more than one combustion engine (7)/electric motor in the same building either through separate air channels (12) or through a united air channel network.
7. A method according to some of the claims 1 - 6 characterized in that the air flow to the engine/s / motor/s is made more effective with the help of at least one suction fan and/or fan that have been installed in connection of the air channel/s.