Bladeless Air Conditioner Fan Using Peltier

Bladeless Air Conditioner Fan Using Peltier

Image: Peltierelement 16x16.jpg by No machine-readable author provided. Bye~commonswiki assu... via Wikimedia Commons, Public domain

How It Works

• The Peltier module's cold side is pressed against a heat sink that incoming air is drawn across, cooling the airflow below ambient temperature.
• The Peltier's hot side is actively cooled by its own small heat sink and fan, keeping the module efficient and preventing thermal runaway.
• A brushless impeller, hidden inside the base, draws air in and pushes it up through the body and out through a thin annular slot in the ring-shaped head — accelerating and smoothing the airflow (the Coandă effect) without any visible blades.
• A temperature sensor and PWM control regulate Peltier power and impeller speed together, balancing cooling effect against power draw.

Components

Peltier module (TEC1-12706 or similar)
Heat sinks (cold side + hot side)
Small brushless fan (hot-side heat dissipation)
Internal impeller/blower unit
Temperature sensor (DHT22 or thermistor)
PWM motor driver
DC power supply + bladeless housing/duct design

Applications

• Personal desk cooling
• Compact room cooling
• Homes with children or pets where exposed blades are a concern

Advantages

• No exposed blades — safer around children and pets, and easier to clean
• Quieter operation than a traditional blade fan at comparable airflow
• Actively cools the air (via Peltier) rather than just moving ambient air like most bladeless fans

Sample Code — Temperature-Based Peltier and Fan PWM Control

// Simplified Peltier + impeller PWM control - Arduino
int tempSensorPin = A0;
int peltierPWM = 9;
int impellerPWM = 10;
float targetTempC = 22.0;

float readTemperatureC() {
  int raw = analogRead(tempSensorPin);
  float voltage = raw * (5.0 / 1023.0);
  return (voltage - 0.5) * 100.0; // typical analog temp sensor scaling
}

void setup() {
  pinMode(peltierPWM, OUTPUT);
  pinMode(impellerPWM, OUTPUT);
}

void loop() {
  float currentTemp = readTemperatureC();

  if (currentTemp > targetTempC) {
    analogWrite(peltierPWM, 200);   // active cooling
    analogWrite(impellerPWM, 180);  // push cooled air out
  } else {
    analogWrite(peltierPWM, 80);    // reduced power, maintain temp
    analogWrite(impellerPWM, 120);
  }
  delay(500);
}

Related Research

• Ecofriendly Design and Development of Bladeless Air Conditioning Fan — ResearchGate