HOT WATER SUPPLY AIR CONDITIONING SYSTEM

• US 20140230477A1
• Filed: 09/28/2012
• Published: 08/21/2014
• Est. Priority Date: 09/30/2011
• Status: Abandoned Application

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Matsui, Nobuki, Furui, Shuji
• Application Number:
  US14/348,394
• Publication Number:
  US 20140230477A1
• Time in Patent Office: Days
• US Class Current: 62/238.6
• CPC Class Codes: F24D 11/0214 water heating system
• CPC Class Codes: F24D 11/0257 air heating system
• CPC Class Codes: F24D 17/02 using heat pumps
• CPC Class Codes: F24D 19/1072 the system uses a heat pump
• CPC Class Codes: F24D 2220/08 Storage tanks
• CPC Class Codes: F24D 3/08 in combination with systems for domestic hot-water supply
• CPC Class Codes: F24D 3/082 Hot water storage tanks specially adapted therefor
• CPC Class Codes: F24D 5/02 operating with discharge of hot air into the space or area to be heated
• CPC Class Codes: F24D 5/12 using heat pumps
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/47 Responding to energy costs
• CPC Class Codes: F24F 11/84 using valves
• CPC Class Codes: F24F 2203/02 System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system
• CPC Class Codes: F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
• CPC Class Codes: F24F 5/00 Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00 , e.g. using solar heat or combined with household units such as an oven or water heater
• CPC Class Codes: F24F 5/0017 using cold storage bodies, e.g. ice
• CPC Class Codes: F24F 5/0096 combined with domestic apparatus
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/003 Indoor unit with water as a heat sink or heat source
• CPC Class Codes: F25B 2313/004 Outdoor unit with water as a heat sink or heat source
• CPC Class Codes: F25B 2313/009 : indoor unit in circulation with outdoor unit in first operation mode, indoor unit in circulation with an other heat exchanger in second operation mode or outdoor unit in circulation with an other heat exchanger in third operation mode
• CPC Class Codes: F25B 2313/0232 : with bypasses
• CPC Class Codes: F25B 2313/0252 : with bypasses
• CPC Class Codes: F25B 2400/24 : Storage receiver heat
• CPC Class Codes: F25B 2600/2507 : Flow-diverting valves
• CPC Class Codes: F25B 27/00 : Machines, plants or systems, using particular sources of energy F25B30/06 takes precedence
• CPC Class Codes: F25B 5/04 : arranged in series
• CPC Class Codes: F25B 6/04 : arranged in series
• CPC Class Codes: Y02B 10/70 : Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
• CPC Class Codes: Y02B 30/13 : Hot air central heating systems using heat pumps
• CPC Class Codes: Y02E 60/14 : Thermal energy storage

Abstract

A hot water supply air conditioning system performs a first cold-storage operation, a second cold-storage operation, and a cold-used air-cooling operation. In the first cold-storage operation, a hot-water-supply-side heat exchanger serves as a condenser, and a thermal-storage-side heat exchanger serves as an evaporator. Moreover, a hot water supplier heats water of a hot water storage tank, and a thermal storage stores cold thermal energy in a thermal storage tank. In the second cold-storage operation, a heat-source-side heat exchanger serves as a condenser, and the thermal-storage-side heat exchanger serves as an evaporator. Moreover, the thermal storage stores cold thermal energy in the thermal storage tank. In the cold-used air-cooling operation, the hot water supply air conditioning system cools room air using cold thermal energy stored in the thermal storage tank.

Claims

1. A hot water supply air conditioning system comprising:

a hot water supplier including a hot water storage tank configured to store hot water to be supplied;

a thermal storage including a thermal storage tank configured to store a thermal storage medium; and

a refrigerant circuit including

a hot-water-supply-side heat exchanger connected to the hot water supplier,

a thermal-storage-side heat exchanger connected to the thermal storage,

a heat-source-side heat exchanger configured to exchange heat between refrigerant and outdoor air, and

a utilization-side heat exchanger configured to condition room air,

wherein the hot water supply air conditioning system performs

a cold-storage operation in which the refrigerant circuit performs a refrigeration cycle such that the thermal-storage-side heat exchanger serves as an evaporator and the thermal storage cools the thermal storage medium of the thermal storage tank with refrigerant flowing through the thermal-storage-side heat exchanger, and

a cold-used air-cooling operation in which the refrigerant circuit circulates refrigerant from the thermal-storage-side heat exchanger to the utilization-side heat exchanger and the thermal storage cools refrigerant flowing through the thermal-storage-side heat exchanger with the thermal storage medium of the thermal storage tank, and

during the cold-storage operation, the hot water supply air conditioning system performs

a first operation in which the hot-water-supply-side heat exchanger serves as a radiator and the hot water supplier heats the water of the hot water storage tank with heat dissipated from refrigerant, and

a second operation in which the heat-source-side heat exchanger serves as the radiator.

2. The hot water supply air conditioning system of claim 1, wherein

the refrigerant circuit further includes

a hot-water-supply-side path in which the hot-water-supply-side heat exchanger is provided,

a heat-source-side path in which the heat-source-side heat exchanger is provided, and

a bypass path connected to both ends of the hot-water-supply-side path and both ends of the heat-source-side path and being switchable among

a first state in which refrigerant flows through the hot-water-supply-side path and bypasses the heat-source-side path,

a second state in which refrigerant bypasses the hot-water-supply-side path and flows through the heat-source-side path, and

a third state in which refrigerant bypasses both of the hot-water-supply-side path and the heat-source-side path.

3. The hot water supply air conditioning system of claim 2, wherein

the hot-water-supply-side path includes a hot-water-supply-side expansion valve disposed on a liquid side of the hot-water-supply-side heat exchanger, and

the heat-source-side path includes a heat-source-side expansion valve disposed on a liquid side of the heat-source-side heat exchanger.