# US 2022/0034535 A1 · Heat exchange unit

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- Number: US 2022/0034535 A1
- Document ID: US20220034535A1
- Status: Published application
- Kind: A1
- Application number: 17/280,576
- Filed: 2019-09-24
- Published: 2022-02-03
- Earliest claimed: 2018-09-28
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Toshiyuki Kobayashi; Toshiyuki Momono
- Web page: https://patentgrep.com/patent/US20220034535A1

## CPC

- F24F 11/36: to leakage of heat-exchange fluid
- 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
- F25B 13/00: Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02)
- F25B 49/02: for compression type machines, plants or systems
- 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}
- F24F 2110/66: Volatile organic compounds [VOC]
- F25B 2313/003: Indoor unit with water as a heat sink or heat source
- F25B 2500/221: Preventing leaks from developing
- F25B 2500/222: Detecting refrigerant leaks
- Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A heat exchange unit that performs at least one of a cooling and a heating of a liquid medium that is sent to a utilization side equipment includes: a heat exchanger that exchanges heat between a flammable refrigerant and the liquid medium; an electric component as an ignition source; a casing that accommodates the heat exchanger and the electric component; and a gas detection sensor with a detection element that is disposed below the electric component and that detects a gas from the flammable refrigerant.

## Claims

### Claim at position 1

-5. (canceled)

### Claim 6

A heat exchange unit that performs at least one of a cooling and a heating of a liquid medium that is sent to a utilization side equipment, the heat exchange unit comprising:
a heat exchanger that exchanges heat between a flammable refrigerant and the liquid medium;
an electric component as an ignition source;
a casing that accommodates the heat exchanger and the electric component; and
a gas detection sensor comprising a detection element that:
is disposed below the electric component, and
detects a gas from the flammable refrigerant.

### Claim 7 (depends on 6)

The heat exchange unit according to claim 6, wherein the detection element is disposed under a point that is 300 mm above a bottom of the casing.

### Claim 8 (depends on 6)

The heat exchange unit according to claim 6, wherein
the casing is disposed in a unit installation space, and
the detection element is disposed within 300 mm from a floor surface on which the heat exchange unit is disposed in the unit installation space.

### Claim 9 (depends on 6)

The heat exchange unit according to claim 6, further comprising
a pump comprising a motor and a terminal box, wherein
an electric wire that supplies electric power to the motor is connected to the terminal box,
the pump is disposed inside the casing and sends the liquid medium to the utilization-side equipment, and
the terminal box is part of the electric component of the heat exchange unit.

### Claim 10 (depends on 6)

The heat exchange unit according to claim 6, wherein the electric component comprises at least one of an electromagnetic switch, a contactor, and a relay.