Ventilation Heat Storage Layout for Subzero Heat Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for controlling energy balance in properties are inefficient, particularly at temperatures below 0°C, as they rely on direct electric heating and ineffective heat exchanger locations, leading to energy wastage and inadequate temperature regulation.
Innovation Solution
A system comprising an exhaust air duct, outflow duct, inflow duct, supply air duct, and a liquid-filled heat storage tank with a compressor circuit and heat exchangers for efficient heat recovery and transfer, using a rotary heat transfer device and additional heater to maintain target temperatures, along with a CO2 sensor for air circulation regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a cross-flow cell is used for heat exchange in ventilation, then heat recovery is enabled, but the system fails at temperatures below 0°C as the cell freezes and requires warm outblow air
Solution Approach 1:
The patent introduces a heat exchanger as an intermediary component that enables heat transfer between exhaust air and supply air without direct contact. This mediator allows heat recovery to occur while preventing the supply air from freezing the heat exchange surfaces, resolving the contradiction between heat recovery efficiency and low-temperature reliability
Solution Approach 2:
The system dynamically adjusts the temperature parameters of the air flows through the heat exchanger. By controlling the temperature difference and flow rates, the system maintains efficient heat recovery while ensuring the supply air remains warm enough to prevent freezing, enabling operation below 0°C
2Temperature
If electric post-heating is used for temperature regulation, then temperature control is achieved, but the system becomes energy-wasting
Solution Approach 1:
The patent converts the waste heat from exhaust air into a useful resource for preheating supply air. By capturing and utilizing the thermal energy that would otherwise be lost, the system reduces or eliminates the need for energy-wasting electric post-heating while maintaining accurate temperature control
Solution Approach 2:
The heat exchanger performs preliminary heating of the supply air using exhaust air heat before the air enters the property. This preliminary action reduces the energy burden on subsequent heating systems, converting a potential energy waste into an energy-saving opportunity
3Loss of energy
If heat exchangers are positioned in the prior art configuration, then some heat recovery is achieved, but the system is not very effective
Solution Approach 1:
The patent optimizes the local positioning and configuration of heat exchangers within the ventilation system. By strategically placing heat exchange surfaces where temperature and flow conditions are most favorable, the system maximizes heat recovery effectiveness rather than achieving only partial recovery
4Adaptability or versatility
If separate functioning components are combined for heating and cooling control, then the system can perform multiple functions, but the energy flows are not jointly effectively controlled
Solution Approach 1:
The patent merges the heating and cooling control functions into a unified ventilation system with a single heat exchanger that handles both thermal regulation tasks. This integration allows joint optimization of energy flows, enabling the system to recover heat for heating while simultaneously managing cooling loads without the energy waste associated with separate components
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
The system effectively recovers and balances energy flows, minimizing additional energy needs by utilizing waste heat for heating and cooling, functioning efficiently across various temperatures and conditions, and enabling continuous heat energy transfer between different spaces.
Implementation Method 1
a first heat exchanger (7) disposed between the exhaust air duct (1) and the outflow duct (2) and a second heat exchanger (8) disposed between the inflow duct (3) and the supply air duct (4)
Implementation Method 2
a rotary heat transfer device in which the rotary and heat-storing discs of the rotor of the heat transfer device are alternately provided in the exhaust flow to heat them and in the supply flow to cool them
Implementation Method 3
the system comprises a compressor and a compressor circuit connectable to the heat storage tank, the compressor circuit including a first heat exchanger
Implementation Method 4
the control system comprises a liquid-filled heat storage tank
Implementation Method 5
the additional heater disposed in the supply air duct downstream of the second heat exchanger is in heat transfer communication with the heat storage tank
Data Source
AI summary
The invention relates to a system for controlling the energy balance of a property, comprising an exhaust air duct (1) from the property to the control system, an outflow duct (2) from the control system, an inflow duct (3) to the control system and a supply air duct (4) to the property from the control system. According to the invention the control system comprises a liquid-filled heat storage tank (5). In addition, connected to the heat storage tank there is a compressor (6) including a first heat exchanger (7) disposed between the exhaust air duct (1) and the outflow duct (2) and a second heat exchanger (8) disposed between the inflow duct (3) and the supply air duct (4) for cooling the air flows and recovering heat into the heat storage tank. A heat transfer device (9) is also provided in the exhaust air flow downstream of heat exchanger (7) and in the supply air flow upstream of heat exchanger (8) for transferring heat from the exhaust air flow to the supply air flow. In addition, an additional heater (10) is provided downstream of the second heat exchanger (8) of the compressor (6) in the supply air duct (4) for adjusting the temperature of the supply air flow to be conveyed to the property.