Temperature control system, temperature control device and refrigeration device

Patent metadata

Field	Value
Publication number	US-10656110-B2
Application number	US-201716069017-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 26, 2016
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A temperature control system includes first and second temperature control devices. In the first temperature control device, a refrigeration circuit of a refrigeration device, which is positioned downstream of an expansion valve and upstream of an evaporator, and a brine circulation path of a brine circulation device, which is positioned on a heating unit, constitutes a refrigeration capacity adjustment mechanism, and cooling is performed by the evaporator of the refrigeration circuit. In the second temperature control device, a refrigeration device includes an injection circuit that bypasses a condensed refrigerant upstream of a compressor, and a hot gas circuit that bypasses a compressed high-temperature refrigerant upstream of a compressor. A part of the brine circulation path of the brine circulation device and an evaporator of the refrigeration device constitute a heating capacity adjustment heat exchanger, and heating or cooling is performed by a load unit of the brine circulation path.

First claim

The invention claimed is:

1. A temperature control system that controls a temperature of a temperature controlled space or a temperature controlled object, the temperature control system comprising a first temperature control device and a second temperature control device,
wherein:
the first temperature control device includes a low-temperature-side refrigeration device and a low-temperature-side brine circulation device;
the first low-temperature-side refrigeration device includes a first low-temperature-side refrigeration circuit in which a first low-temperature-side compressor, a first low-temperature-side condenser, a first low-temperature-side expansion valve and a first low-temperature-side evaporator are connected such that a first low-temperature-side refrigerant is circulated therethrough in this order;
the low-temperature-side brine circulation device includes a low-temperature-side brine circulation path for circulating a low-temperature-side brine, and a low-temperature-side heating unit that constitutes a part of the low-temperature-side brine circulation path and is capable of heating the low-temperature-side brine received therein;
a portion of the first low-temperature-side refrigeration circuit, which is positioned on the downstream side of the first low-temperature-side expansion valve and on the upstream side of the first low-temperature-side evaporator, and a portion of the low-temperature-side brine circulation path, which is positioned on the downstream side of the low-temperature-side heating unit, constitute a refrigeration capacity adjustment mechanism in which they can exchange heat with each other;
the first low-temperature-side evaporator is capable of causing the first low-temperature-side refrigerant flowing through the first low-temperature-side evaporator to absorb heat of the temperature controlled space or the temperature controlled object;
the second temperature control device includes a high-temperature-side refrigeration device and a high-temperature-side brine circulation device;
the high-temperature-side refrigeration device includes:
a high-temperature-side refrigeration circuit in which a high-temperature-side compressor, a high-temperature-side condenser, a high-temperature-side expansion valve and a high-temperature-side evaporator are connected such that a high-temperature-side refrigerant is circulated therethrough in this order;
an injection circuit which includes: an injection flow path that communicates a portion of the high-temperature-side refrigeration circuit, which is positioned on the downstream side of the high-temperature-side condenser and on the upstream side of the high-temperature-side expansion valve, and a portion of the high-temperature-side refrigeration circuit, which is positioned on the downstream side of the high-temperature-side evaporator and on the upstream side of the high-temperature-side compressor, such that the high-temperature-side refrigerant can flow therethrough; and an injection valve capable of adjusting a flow rate of the high-temperature-side refrigerant flowing through the injection flow path; and
a hot gas circuit which includes: a hot-gas flow path that communicates a portion of the high-temperature-side refrigeration circuit, which is positioned on the downstream side of the high-temperature-side compressor and on the upstream side of the high-temperature-side condenser, and a portion of the injection fluid path, which is positioned on the downstream side of the injection valve, such that the high-temperature-side refrigerant can flow therethrough; and a hot gas valve capable of adjusting a flow rate of the high-temperature-side refrigerant flowing through the hot-gas flow path;

the high-temperature-side brine circulation device includes: a high-temperature-side brine circulation path for circulating a high-temperature-side brine; a high-temperature-side heating unit that constitutes a part of the high-temperature-side brine circulation path and is capable of heating the high-temperature-side brine received therein; and a load unit that constitutes a part of the high-temperature-side brine circulation path on the downstream side of the high-temperature-side heating unit, and is capable of causing heat of the high-temperature-side brine received therein to be released to the temperature controlled space or the temperature controlled object, or is capable of causing the high-temperature-side brine to absorb heat of the temperature controlled space or the temperature controlled object; and
a part of the high-temperature-side brine circulation path and the high-temperature-side evaporator of the high-temperature-side refrigeration device constitute a heating capacity adjustment heat exchanger in which they can exchange heat with each other.

2. The temperature control system according to claim 1 , further comprising a control unit that controls the first temperature control device and the second temperature control device,
wherein:
when the temperature of the temperature controlled space or the temperature controlled object is controlled to a desired temperature in a low temperature range, the control unit causes the first low-temperature-side refrigerant to be circulated in the low-temperature-side refrigeration device, causes the low-temperature-side brine to be circulated in the low-temperature-side brine circulation device and causes the high-temperature-side brine to be circulated in the high-temperature-side brine circulation device, while the control unit does not cause the high-temperature-side refrigerant to be circulated in the high-temperature-side refrigeration device;
when the temperature of the temperature controlled space or the temperature controlled object is controlled to a desired temperature in a middle temperature range that is set higher than the low temperature range, the control unit does not cause the first low-temperature-side refrigerant to be circulated in the low-temperature-side refrigeration device and does not cause the low-temperature-side brine to be circulated in the low-temperature-side brine circulation device, while the control unit causes the high-temperature-side refrigerant to be circulated in the high-temperature-side refrigeration device and causes the high-temperature-side brine to be circulated in the high-temperature-side brine circulation device; and
when the temperature of the temperature controlled space or the temperature controlled object is controlled to a desired temperature in a high temperature range that is set higher than the middle temperature range, the control unit does not cause the first low-temperature-side refrigerant to be circulated in the low-temperature-side refrigeration device and does not cause the low-temperature-side brine to be circulated in the low-temperature-side brine circulation device, while the control unit causes the high-temperature-side refrigerant to be circulated in the high-temperature-side refrigeration device, and causes the high-temperature-side brine to be circulated in the high-temperature-side brine circulation device, with increasing a flow rate of the high-temperature-side brine to be circulated in the high-temperature-side brine circulation device as compared with a flow rate in the case of the middle temperature range.

3. The temperature control system according to claim 1 , wherein:
in the first temperature control device, a portion of the first low-temperature-side refrigeration circuit, which is positioned on the downstream side of the first low-temperature-side expansion valve and on the upstream side of the first low-temperature-side evaporator, and a portion of the first low-temperature-side refrigeration circuit, which is positioned on the downstream side of the first low-temperature-side evaporator and on the upstream side of the first low-temperature-side compressor, con

Assignees

• Shinwa Controls Co Ltd

Inventors

• HIGASHIDA Kazunari
• Komori Hirofumi
• Okamoto Yoshiyuki
• Furumoto Hideaki
• Ito Tomoaki
• Mori Hiroki
• SHIOTSUKI Go
• Suzuki Kouji

Classifications

• F25B2700/1933

  Suction pressures · CPC title

• G05D23/1919

  characterised by the type of controller · CPC title

• F25B5/04

  arranged in series · CPC title

• F25B2600/13

  Pump speed control · CPC title

• F25B2339/047

  Water-cooled condensers · CPC title