JPS63286653A - Hot-water supplier - Google Patents

Abstract

PURPOSE:To permit energy saving and space saving hot-water supply, by a method wherein living houses are provided respective with a small hot-water reserving tank, heated by a single heat source, and one of the hot-water reserving tanks, whose flow rate per unit time, which is measured by a flow meter connected to the hot-water reserving tank, exceeds a set flow rate for a predetermined period of time or more, is heated preferentially. CONSTITUTION:A refrigerating cycle is constituted by a heat source machine 1, an evaporator 2, a plurality of condensors 3 and refrigerant flow rate control valves 6. Water in a hot-water reserving tank 4 is sent to the condensor 3 by a curculating pump 5. The water, whose heat has been exchanged, is returned to the hot-water reserving tank 4 and the hot-water is supplied to the hot-water reserving tank 4 through a hot-water supplying pipe 9 while water is supplied to the same through a water feeding pipe 10. Flow meters 7 are provided on the way of the water feeding pipes 10, flow rate data are sent to a controller 8 to operate the flow rate per unit time and the amount of heating of respective condensors is controlled by the control valves. A big supplying amount of hot-water is generated by the filling of bathtubs, however, the capacity of the hot-water reserving tank is small, therefore, the hot-water reserving tanks are heated simultaneously with the filling of the bathtubs and the circulating amount of refrigerant for the condensors and the flow rate control valves are regulated so that the amount of heat exchange of the condensors becomes maximum during filling of the bathtubs.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hot water supply system in an apartment complex or the like.

Conventional technology Traditionally, hot water systems in apartment buildings have been of the collective type or the individual type. A collective hot water system supplies hot water to the entire residential building using a single heat source. It always supplied hot water at a constant temperature to avoid running out of hot water.

Problems to be Solved by the Invention In conventional systems such as those described above, firstly, collective hot water systems always require a large heat source in order to supply a constant hot water temperature and unconditionally meet the demands of residents. I had no choice but to use the machine.

Additionally, because hot water was constantly being circulated at high temperatures, there was a large amount of heat loss and the system was not energy efficient.

The present invention aims to solve these problems and provide a hot water supply system for housing complexes that is energy-saving, space-saving, and does not run out of hot water.

Means for Solving the Problem To achieve this objective, each dwelling unit was equipped with a small hot water tank, and the heating source for the hot water tank was only one, which was measured by a flow meter connected to the hot water tank. A hot water storage tank whose flow rate per unit time continuously exceeds the set flow rate for a set time or longer is heated preferentially.

By this method, it is possible to provide a hot water supply system for apartment buildings that is energy efficient, space saving, and does not run out of hot water.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram when a heat pump water heater is used as a heat source device. A refrigeration cycle is constructed by connecting a heat source device 1 consisting of a compressor and an expansion valve, an evaporator 2 as an air heat source, a plurality of condensers 3, and a refrigerant flow rate control valve 6 through refrigerant piping. The evaporator 2 at this time may be water-cooled.

Water in the hot water tank 4 is sucked up from the bottom of the hot water tank by a circulation pump 5 and sent to the condenser 3. The heat-exchanged water is returned to the hot water tank 4 again. Water is supplied to the hot water storage tank 4 through a water supply pipe 10 and hot water is supplied through a hot water supply pipe 9.

A flow meter 7 is installed in the middle of the water supply pipe 10. The flow meter can be installed anywhere as long as it is in the middle of the hot water supply route.The flow rate data measured by the flow meter 7 is sent to the controller 8. As a result, the flow rate control valve 6 controls the heating amount of each condenser.

The effect will be explained below. This system is 1
A single heat source unit supplies hot water to multiple residences, and by taking advantage of the simultaneous usage rate of hot water, it is possible to have a large heating capacity per residence, while requiring a small overall heat source capacity. be. This means that although the capacity of the heat exchanger 3 is large in FIG. 1, the capacity of the heat source device 1 can be made smaller than the sum of the capacities of all the heat exchangers. At this time, by having a hot water tank in each house,
The simultaneous usage rate can be further reduced, and conversely, considering the start-up characteristics of the refrigeration cycle, instantaneous heating with a heat pump is difficult, and a hot water storage tank with a certain capacity is required. In order to reduce the capacity of this hot water storage tank, looking at the characteristics of the hot water supply load in a house, the largest load is filling the bathtub with water, and a large amount of hot water is continuously supplied at this time.

If we were to cover this with only hot water from the hot water tank, a large bathtub would require a capacity equivalent to 200 liters at 50°C. In order to further reduce the required capacity of the hot water storage tank, the hot water storage tank may be heated at the same time as filling with water. This is called water filling and simultaneous heating. In order to certify that water is currently being filled, we look at the amount of hot water used by purpose on -day.The largest amount is for hot water supply when water is being filled. It is also the largest in length.

You can use this information to understand the purpose of hot water supply.

If you want to fill 2001 with water in 20 minutes, you will need a flow rate of 101/min. Taking advantage of the fact that this continues for 20 minutes, when 71/min or more is used continuously for 2 minutes or more, it is recognized as water filling time and water filling and simultaneous heating is started. When the flow meter 7 in Figure 1 measures a usage rate of 71/min or more for 2 minutes, adjust all flow control valves and adjust the amount of refrigerant circulating to the condenser 3 to maximize the amount of heat exchange. Make it. The water supplied from the water supply pipe 10 at the same time as the hot water supply from the hot water supply pipe 9 is mixed with the surrounding hot water at the lower part of the hot water storage tank, and is heated to 50° C. by heat exchange with the condenser 3 by the circulation pump 5. The hot water is returned to the hot water storage tank 4 and used for filling water through the hot water supply pipe 9. For example, if heat exchanger 3 has an auxiliary heating capacity of 10,000 kcal/h,
4.21/min water 40deg from 10℃ to 50℃
The temperature should be able to rise, and if you want to fill the water in 20 minutes, the amount of hot water supplied by simultaneous heating of the water and water will be 4.
．． After 2X20 minutes, the shaded area becomes 841, and the hot water tank capacity is 2.
The required amount of 001 at 50°C is about 1201, and if converted to 60°C, it can be reduced to 961.

In order to supply heat using a heat source with as small a capacity as possible, it is necessary to distribute the heating capacity appropriately to avoid running out of hot water in residential units that require heating quickly. If it is not necessary to heat the water and water at the same time, the other dwelling units can be heated when there is sufficient heat source capacity.

In addition, since each unit has a hot water storage tank, it can fully meet hot water needs by heating only when needed, which saves energy compared to conventional collective types that continuously circulate high-temperature water.

FIG. 3 shows an example to which this control is applied. The lattice part in the figure is used to supply water to the bathtubs in each dwelling unit. Even if the amount of hot water used by each dwelling unit overlaps, the only time it is necessary to quickly heat the bathtub is when filling the bathtub with water, so under the normal concept of simultaneous usage rate, this control is used even during times when the usage rate should be 60%. It is possible to reduce the amount by up to 40%. In other words, the heat source capacity can be reduced accordingly.

Effects of the Invention As described above, with the water heater having the control of the present invention, not only the hot water storage tank but also the heat source capacity can be reduced, and hot water supply without running out of hot water can be realized in an energy and space saving manner.
Its practical effects are significant.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a water heater according to an embodiment of the present invention.
FIG. 2 is a diagram showing the ratio of the amount of hot water supplied by simultaneous heating of water when the bathtub is filled with water, and FIG. 3 is a diagram showing changes in the simultaneous usage rate in the system. 1... Heat source machine, 2... Evaporator, 3... Condenser, 4
...Hot water tank, 6...Valve, 7...Flow meter, 8...
controller.

Claims (1)

[Claims] comprising a plurality of hot water storage tanks, one heating source for the plurality of hot water storage tanks, and a flow meter connected to each of the hot water storage tanks, wherein the flow rate per unit time measured by the flow meter is greater than or equal to a set time; A water heater that controls heating of a hot water storage tank with priority when the flow rate continuously exceeds a set flow rate.