Heat Medium Relay Unit Layout for Leak Containment and Freeze Protection
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Solution Overview
Problem
Conventional air-conditioning apparatuses face challenges in preventing refrigerant leakage into indoor spaces and freezing of the heat medium in cold climates, particularly when the heat medium relay unit is installed indoors, as it exposes heat medium pipes to outdoor cold temperatures.
Innovation Solution
The air-conditioning apparatus installs the heat medium relay unit, including an intermediate heat exchanger and pressure relief device, on the outer wall of a building, ensuring that refrigerant leaks are directed outdoors and heat medium pipes are protected from freezing by maintaining them indoors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat medium relay unit is installed indoors, then the heat medium pipes are protected from freezing, but refrigerant leakage into the indoor space cannot be prevented
Solution Approach 1:
The patent introduces a relief valve as an intermediary safety device in the heat medium circuit. When refrigerant leaks into the heat medium circuit, the relief valve activates to discharge the refrigerant and heat medium to the inside of the heat medium relay unit, preventing refrigerant from entering the indoor space through the load heat exchanger
2Object-affected harmful factors
If the heat medium relay unit is installed outdoors, then refrigerant leakage into the indoor space is prevented, but the heat medium pipes are exposed to cold and freeze
Solution Approach 1:
The relief valve serves as a protective intermediary that allows the heat medium relay unit to be installed outdoors while preventing refrigerant from reaching the indoor space. The valve discharges refrigerant into the relay unit housing rather than allowing it to enter the indoor space through the heat medium circuit
3Object-affected harmful factors
If the relief valve discharges refrigerant and heat medium to the inside of the heat medium relay unit, then refrigerant leakage into the indoor space is prevented, but the frequency of failures increases due to poor heat medium circulation
Solution Approach 1:
The relief valve acts as a controlled discharge mechanism that redirects refrigerant into the relay unit housing. This intermediary action prevents refrigerant from contaminating the indoor space while the housing design contains the discharged substances, allowing the system to maintain operational reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces refrigerant leakage into indoor spaces and prevents heat medium freezing, enhancing safety and operational reliability by containing refrigerant leaks and maintaining heat medium circulation efficiency.
Implementation Method 1
a heat-source heat exchanger configured to cause heat between to be performed between outside air and refrigerant
Implementation Method 2
an intermediate heat exchanger configured to cause heat exchange to be performed between a heat medium and the refrigerant
Implementation Method 3
a load heat exchanger configured to cause heat exchange to be performed between air in the air-conditioned space and the heat medium
Data Source
AI summary
An air-conditioning apparatus includes an outdoor unit, a heat medium relay unit, and an indoor unit. The outdoor unit is installed in an outdoor space, which is a space outside a building including an air-conditioned space. The heat medium relay unit is installed in the outdoor space, and includes a housing that accommodates an intermediate heat exchanger. The indoor unit includes a load heat exchanger configured to exchange heat between air and a heat medium. The housing is installed to the outer wall of the building.