JP2001041554A - Kitchen exhaust heat recovering system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kitchen exhaust heat recovery system capable of effectively utilizing heat energy possessed by high temperature exhaust gas generated from a kitchen apparatus so as to be in being excellent in economical efficiency and producing an effect of suppressing the increase of an air temperature in city thermal environment. SOLUTION: This system comprises kitchen exhaust equipment to guide exhaust gas generated at a kitchen 1 to the outside of a room through an exhaust duct 4 and hot water supply equipment having a hot water apparatus 6 situated in a water supply piping system 5. An exhaust heat recovering device 7 to increase temperature through heat-exchange of water, supplied from a water supply piping system 5, with exhaust gas in a spot situated upper stream from the hot water apparatus 6 is located in the exhaust duct 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kitchen exhaust heat recovery system for recovering and utilizing heat from high-temperature exhaust gas generated in a kitchen such as a house or a store.

[0002]

2. Description of the Related Art Generally, a kitchen provided in a house or a store has a ventilation hood for sucking exhaust gas generated in the kitchen, above a kitchen appliance such as a gas or electric range, and a ventilation hood. A kitchen exhaust system is provided that has an exhaust duct that communicates with the hood and guides the exhaust to the outside.

[0003]

By the way, since the air discharged from the kitchen to the outside in this way has a high temperature and a large flow rate, precious heat energy is wasted. It is not preferable from the viewpoint of effective use of energy. In addition, especially in an urban area where stores and the like are densely populated, there is a problem that the temperature increases in the thermal environment.

[0004] The present invention has been made in view of the above circumstances, and can effectively use the heat energy of the high-temperature exhaust gas generated from kitchen equipment, and thus is excellent in economical efficiency and, at the same time, is excellent in the urban thermal environment. It is an object of the present invention to provide a kitchen exhaust heat recovery system capable of exhibiting an effect of suppressing a rise in temperature in a kitchen.

[0005]

According to a first aspect of the present invention, there is provided a kitchen exhaust heat recovery system according to the present invention, wherein a kitchen exhaust system for guiding exhaust air generated in a kitchen to the outside through an exhaust duct and a water supply piping system. A hot water supply system provided with a water heater, and an exhaust heat recovery device that heats water supplied from the water supply piping system on the exhaust duct upstream of the water heater with the exhaust gas to raise the temperature. Is interposed.

[0006] Generally, due to high-temperature exhaust gas generated from kitchen equipment or the like, the temperature of the exhaust gas discharged from the kitchen becomes higher than the supply water temperature. Therefore, according to the first aspect of the present invention, this is used as an auxiliary heat source of the hot water supply equipment, and the exhaust heat and the water are exchanged with each other in the exhaust heat recovery device to raise the temperature of the water supply, and then supplied to the water heater. I do. As a result, the temperature of the air discharged from the exhaust duct to the outside is reduced, and at the same time, the thermal energy required by the electricity or gas required for hot water supply is reduced. Further, since the kitchen exhaust equipment and the hot water supply equipment are usually close to each other, a heat supply loss is small, and thus the heat energy of the exhaust gas can be efficiently used for preheating of the water supply.

Therefore, according to the kitchen exhaust heat recovery system according to the present invention, the heat energy of the high-temperature exhaust gas generated from the kitchen equipment can be effectively used, and the energy required for hot water supply can be saved. It is not only economical, but also has the effect of suppressing temperature rise in the urban thermal environment.

[0008]

1 and 2 show an embodiment of a kitchen waste heat recovery system according to the present invention, wherein reference numeral 1 in the figure denotes a kitchen. Inside the kitchen 1, a kitchen appliance 2 such as a gas range is arranged. Above the kitchen appliance 2, a ventilation hood 3 for sucking exhaust gas generated in the kitchen 1 is provided.
And an exhaust duct 4 that communicates with the ventilation hood 3 and guides exhaust air to the outside.
Further, in the kitchen 1, a hot water supply facility provided with a water heater 6 for heating water supplied from a water supply piping system 5 is provided.

The exhaust duct 4 is provided with an exhaust heat recovery device 7.
Is provided. As shown in FIG. 2, the exhaust heat recovery device 7 has a plate-shaped heat recovery coil 8 introduced into an exhaust duct 4, and a water heater 6 is provided at an inlet side 8 a of the heat recovery coil 8. The water supply piping system 5 on the upstream side is connected, and the outlet side 8 b of the heat recovery coil 8 is connected to the inlet side pipe of the water heater 6.

Next, the operation of the kitchen exhaust heat recovery system having the above configuration will be described. Generally, in the kitchen 1, there are relatively many opportunities to use the hot water supply facilities during the time when the kitchen equipment 2 is used. When the kitchen equipment 2 is used, the temperature of the exhaust gas discharged from the kitchen 1 becomes higher than the water supply temperature due to the high-temperature exhaust gas generated from the kitchen equipment 2, and this exhaust gas is exhausted. The feedwater introduced from the duct 4 into the exhaust heat recovery device 7 and sent from the water supply piping system 5 to the heat recovery coil 8 is heated and heated. Then
The feed water preheated in the exhaust heat recovery device 7 is further sent to the water heater 6, where it is heated to a temperature sufficient for hot water supply. On the other hand, the temperature of the exhaust gas that has passed through the exhaust heat recovery device 7 decreases due to heat exchange with the supply water, and is discharged outside from the exhaust duct 4.

As described above, according to the above-mentioned kitchen waste heat recovery system, the heat energy of the high-temperature exhaust gas generated from the kitchen equipment 2 is used in the waste heat recovery device 7 for preheating the supply water supplied to the hot water supply equipment. It can be effectively used, and thus can save heat energy by electricity or gas required for hot water supply, so that it is economically excellent. In addition, since the temperature of the exhaust gas discharged from the exhaust duct 4 is reduced by exchanging heat with the water supply in the exhaust heat recovery device 7, it is possible to obtain the effect of suppressing the temperature rise in the urban thermal environment. it can.

Generally, in this kind of kitchen 1,
Since the kitchen exhaust equipment and the hot water supply equipment are close to each other, the heat supply loss is small, so that the thermal energy of the exhaust gas can be efficiently used for preheating of the water supply.

In the above embodiment, only the case where a plate-shaped heat recovery coil 8 is used as the exhaust heat recovery device 7 has been described. However, the present invention is not limited to this, and water is supplied. A fin is provided on the outer circumference of the pipe, and an exhaust flow path communicating with the exhaust duct 4 is formed around the fin. Heat exchangers are applicable.

[0014]

As described above, according to the kitchen exhaust heat recovery system of the first aspect, the heat energy of the high-temperature exhaust gas generated in the kitchen is supplied to the hot water supply equipment in the exhaust heat recovery device. Can be effectively used for pre-heating of the supply water, which saves heat energy by electricity or gas required for hot water supply, which is economical. The replacement reduces the temperature of the exhaust gas discharged from the exhaust duct, so that an effect of suppressing an increase in temperature in the urban thermal environment can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing the exhaust heat recovery device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kitchen 2 Kitchen equipment 3 Ventilation hood 4 Exhaust duct 5 Water supply piping system 6 Water heater 7 Exhaust heat recovery device

Claims (1)

[Claims] 1. A kitchen exhaust system that guides exhaust air generated in a kitchen to the outside of the room via an exhaust duct, and a hot water supply system in which a water heater is provided in a water supply piping system.
An exhaust heat recovery system for a kitchen, comprising an exhaust heat recovery device that heats water supplied from the water supply piping system with the exhaust gas to raise the temperature on the upstream side of the water heater.