JPS5916362B2 - water-cooled lighting system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-cooled lighting device, and more particularly to a system for removing and utilizing lighting heat.

A conventional device of this type has a plurality of water-cooled lighting fixtures 1 arranged in series as shown in Fig. 1, connected in series in a conduit, and cooled by water flowing in from the inlet side of the pipe with a temperature of around 20°C. The water comes out with a temperature rise of about 5 degrees from the front side (therefore, the lighting heat is extracted, and this lighting heat is heat exchanged with the cold water produced by the cold heat source equipment via the heat exchanger 4'. The idea was to dispose of or recover and reuse the waste.

However, in recent years, due to the increase in lighting capacity, office equipment, etc.
Air conditioning is increasingly being used throughout the year,
Rather than using the recovered heat as a heating heat source, it is now more common for it to simply be discharged as a cooling load.

Considering the economic efficiency of air conditioning in this context,
A method for discharging lighting heat without using cold source equipment is required.

Originally, the water temperature after passing through water-cooled lighting equipment is at most 30°C, and generally when 5 units are connected, the inlet water temperature is 20°C, and the outlet water temperature is 20°C.
The temperature is around 5℃.

If we consider the use of groundwater and river water, the above concept can be satisfied, but in Japan there is also the problem of ground subsidence, so this is not possible for every building.

Furthermore, it was considered difficult to dissipate heat during the day using cooling towers, as outside temperatures can exceed 30°C during the day in summer.

In other words, in a method of cooling water by inserting a Kulig tower in series in a water circuit configuration that circulates water to cool water-cooled lighting equipment, the cooling of water by the cooling tower depends on the outside temperature. During the daytime in summer, when the outside temperature is high, the water cannot be cooled to a temperature sufficient to cool the water-cooled lighting equipment, and in winter, when the outside temperature is low, the water is cooled too much, causing condensation on the water-cooled lighting equipment. There was a drawback that this could occur.

The present invention aims to eliminate these drawbacks and provide a system that is efficient (removes lighting heat and reduces cooling load).

That is, the present invention has a heat storage tank for storing water for passing through water-cooled lighting equipment, and a cooling tower for dissipating lighting heat outdoors, and the water-cooled lighting equipment and the cooling tower are arranged in parallel with the heat storage tank. The main idea is to have a waterway configuration of

An embodiment of the present invention will be described below with reference to the drawings.

That is, FIG. 2 is a block diagram showing one embodiment of the present invention, in which 1a to 1e are water-cooled lighting fixtures, and each of the water-cooled lighting fixtures 1a to 1e is a cooling system that can remove lighting heat through water. and each water-cooled lighting fixture 1a
~1e are connected in series to form a water circuit.

3as3b is a heat storage tank that stores water for passing through the water-cooled lighting devices 1a to 1e, and the volumes of the heat storage tanks 3a and 3b are selected depending on the amount of heat generated by the water-cooled lighting devices 1a to 1e.

Further, the type of the heat storage tank 3as 3b can be selected from an underground water tank, a tank, etc. depending on the situation of the installation location.

The water-cooled lighting devices 1a to 1e and the heat storage tanks 3a and 3b are connected by a water circuit 9 on the water supply side and a water outlet path 10 on the discharge side.

A pump 6 is provided in the water circuit 9 on the supply side.
Pulp 5as is placed between the and water-cooled lighting equipment 1a to 1e.
sb is provided.

A heat storage tank 3as s is provided between the pulp 5a and the heat storage tank 3b.
A water outlet passage 11 is provided for cooling the water in the water tank b, and a cooling tower 2 is provided in the water circuit 11 in parallel with the water-cooled lighting devices 1a to 18.

A bypass 8 is provided in the pulp 5b and connected to the heat storage tank 3b so that water returns to the heat storage tank 3b.

Note that an auxiliary cooler 7 is provided between the pump 6 and the pulp 5b.
In this case, even if the water temperature in the heat storage tanks 3a and 3b rises and exceeds the cooling capacity of the cooling tower 2, the supplied water can be cooled, and therefore the water-cooled lighting devices 1a to 1e The temperature of the water sent to can be maintained at an appropriate temperature.

During daytime cooling, the heat storage tank 3a is used immediately after the start of operation.
The water inside is sent by a pump 6 to the water-cooled lighting fixtures 1a to 1b.

Here, the temperature of the water increases by 3 to 5 degrees and returns to the heat storage tank 3b, but if heating is required somewhere in the building and heat is required, the heat from the lighting is recovered by the heat exchanger 4 and used. used.

The water returned to the heat storage tank 3b becomes a piston flow and flows into the heat storage tank 3a.
Move to.

The water in the heat storage tanks 3a, 3b is sent to the water outlet passage 11 by opening the pulp 5a as required, and is cooled in the cooling tower 2.

Normally, cooling of the water-cooled lighting fixtures 1a to 1e and cooling in the cooling tower 2 are performed in parallel, but during high temperatures in summer, return water from the water-cooled lighting fixtures 1a to 1e (water temperature 25°C to 30°C) is used. (In addition, the heat can also be radiated by the cooling tower 2 at night when the outside temperature has dropped.

If the return water that has taken away the lighting heat is 25°C or lower, it has sufficient ability to take away the lighting heat even if it is recirculated.

Depending on the size of the tank, it may be possible to cover the air-conditioning period just by making the entire cycle of water in the tank.

Also, if the capacity of the tank is small, it will be necessary to circulate the water two or three times, and in this case, the inlet water temperature may rise to 25°C or higher, so the auxiliary cooler 7 will lower the inlet water temperature to the water-cooled lighting equipment to 25°C. There is also a need to lower it below.

As explained above, the present invention provides a heat storage tank that can store a large amount of water, and the water-cooled lighting equipment and the cooling tower form a water circuit in parallel with the heat storage tank, so that the energy consumption depends on changes in the outside temperature. The temperature of the water supplied to the water-cooled lighting equipment can be maintained at an appropriate temperature without causing excessive cooling, and the water-cooled lighting equipment can be effectively cooled without causing dew condensation due to overcooling.

The size of the tank will vary depending on which season economic efficiency is most desired (although, as an example, the amount of water in the heat storage tanks 3a and 3b will be determined by the amount of water passing through the water-cooled lighting fixtures 1a to 1b during the air conditioning hours of the day). If the water volume is reduced to half, the water in the tank will be circulated twice a day, raising the temperature from 20℃ to 24℃ to 25℃, and finally to 28℃ to 29℃, during the hottest part of the summer. It is also possible to use a cooling tower at night.

However, during the summer months, the outside temperature at night is extremely high, so it may be possible to use an auxiliary cooler T, but late-night electricity can be used, and in any case, the heat from the lighting can be disposed of economically.

Furthermore, since the outside temperature drops considerably in the middle of the year, it goes without saying that it is possible to operate more economically by using the cooling tower 2 or by using the bypass 8 when the outside temperature is too low. Its practical value is enormous, as it can significantly reduce capacity and operating costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional water-cooled lighting device, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1a to 1b are water-cooled lighting equipment, 2 is a cooling tower,
3 is a heat storage tank, 4 is a heat exchanger, 5 is a three-way valve, 6 is a pump,
7 is an auxiliary cooler, 8 is a bypass.

Claims (1)

[Claims] 1 A plurality of water-cooled lighting fixtures connected to form a series water circuit, a heat storage tank that supplies water to the water-cooled lighting fixtures, and a water circuit connected to the supply side water circuit to the water-cooled lighting fixtures via a valve. A water-cooled lighting fixture comprising a cooling tower forming a water circuit in parallel with the water-cooled lighting fixture.