Ventilation Unit Frost Control Using Humidity-Based Heating
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Solution Overview
Problem
Ventilation units face inefficiencies in energy consumption due to unnecessary heating from high humidity in exhaust air, leading to potential icing issues, especially during periods of low room usage or humidity fluctuations.
Innovation Solution
Incorporating sensors to measure temperature and humidity levels, with a control device that adjusts the heating device's operation based on detected values, ensuring it only activates when there's a risk of icing, thereby minimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heating device is operated continuously to prevent icing of the heat exchanger, then frost protection is ensured, but energy consumption increases unnecessarily
Solution Approach 1:
The heating device operates dynamically based on real-time sensor data rather than continuously. The control unit adjusts heating operation based on detected temperature and humidity conditions, activating heating only when icing risk is detected and deactivating when conditions are safe, thereby reducing unnecessary energy consumption while maintaining frost protection reliability
Solution Approach 2:
The system incorporates sensors that continuously monitor temperature and humidity conditions and feed this information back to the control unit. The control unit processes this feedback to determine when heating is necessary, creating a closed-loop control system that optimizes energy usage based on actual environmental conditions rather than operating blindly
2Device complexity
If the heating device is operated based only on supply air temperature, then simple control is maintained, but unnecessary heating occurs when exhaust air humidity is low
Solution Approach 1:
The control system evaluates multiple parameters (supply air temperature, exhaust air temperature, supply air humidity, and exhaust air humidity) to make heating decisions. By incorporating humidity measurements from both air streams, the system gains a more comprehensive understanding of icing risk, allowing it to avoid unnecessary heating operations while maintaining reliable frost protection
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 energy consumption by only heating when necessary for frost protection, optimizing energy efficiency and maintaining indoor air quality by accounting for humidity and temperature relationships.
Implementation Method 1
A heat exchanger is also typically used for the purpose of heat recovery. This can be designed, for example, as a counterflow heat exchanger and is used to extract heat from the exhaust air to be discharged, i.e. the room air to be discharged, in the form of heat energy, which is transferred to the supply air to be supplied to the room by heating the supply air within the heat exchanger.
Implementation Method 2
it is also known from the prior art to provide appropriate heating devices for the supply air. Such heating devices serve to preheat the fresh air, which is particularly cool in the cold winter months, to a temperature which counteracts icing of the air-conducting structural components, in particular the heat exchanger, of the ventilation unit.
Implementation Method 3
A ventilation unit according to the invention has a measuring device that allows temperature and humidity to be recorded by means of appropriate sensors.
Implementation Method 4
At least the temperature of the supply air and the humidity of the exhaust air are preferably detected.
Implementation Method 5
The risk of icing increases with increasing humidity in the exhaust air. According to the invention, the heating device is switched for the purpose of frost protection as a function of the measured values detected, ie the temperatures and humidity levels detected.
Data Source
Figure 1
AI summary
The room ventilation unit (1) comprises a fan device (3), a heat exchanger (2), a heater (18), and a measuring device (16) having sensors (12-15) for detecting the temperature and humidity of supplied air. A control device (17) is connected to a comparator circuit which compares the values detected by the measuring device with predetermined reference values. The heater is activated for heating the supplied air, depending on the comparison result. Independent claims are included for the following: (1) method of supplying fresh air to room; (2) controller of room ventilation unit; and (3) method for controlling fan device and heat exchanger of room ventilation unit.