In the pharmaceutical and healthcare sectors, maintaining the integrity of high-value drugs and vaccines is not just about compliance – it is about reliability. However, operational efficiency matters too. With energy prices fluctuating, procurement heads and facility managers are rightly asking: what is the most cost-effective way to store large volumes of temperature-sensitive inventory?
Often, businesses start small with chest freezers and simply add more as they grow. But there comes a tipping point where this approach becomes inefficient, both in terms of workflow and energy consumption.
At Wessex Refrigeration Hire, we believe in transparency. Let’s crunch the numbers and analyze the commercial coldroom running costs versus relying on a bank of chest freezers. We will use a real-world example to see which solution makes the most sense for your bottom line.
The Scenario: 14 Cubic Metres of Storage
Let’s imagine you need to store approximately 14 cubic metres of product. This is a common requirement for a medium-sized pharmaceutical distribution hub or a busy hospital pharmacy.
You have two main options to achieve this capacity:
- Option A: A single Walk-In Coldroom (4m long x 2m wide x 2m high).
- Option B: Multiple Chest Freezers (approx. 1.5 cubic metres each).
To reach 14 cubic metres using chest freezers, you would need roughly 9 large chest freezers.
Now, let’s look at the power consumption.
The Analysis: Energy Consumption and Costs
1. The Walk-In Coldroom
For our walk-in solutions, we use high-efficiency, German-engineered GOVI 2000P refrigeration units. These are the gold standard for reliability and energy-efficient refrigeration.
- Amp Draw: A GOVI 2000P typically draws 7 Amps when running.
- Runtime: A high-quality coldroom with 85mm insulation doesn’t run continuously. In a typical UK climate, the system generally runs about 60% of the time to maintain temperature.
- Voltage: Standard single-phase 230V.
The Calculation:
- Power (Watts) = Amps x Volts = 7A x 230V = 1,610 Watts (1.61 kW).
- Daily Consumption = 1.61 kW x 24 hours x 60% runtime = 23.18 kWh per day.
2. The Bank of Chest Freezers
Now, let’s look at the alternative. Commercial chest freezers are generally less efficient per cubic metre than a consolidated walk-in unit. A typical large 1.5m³ commercial chest freezer draws around 3 Amps.
- Amp Draw: 3 Amps per unit.
- Number of Units: 9 units (to match the 14m³ capacity).
- Runtime: Chest freezers also cycle on and off, but let’s be generous and assume a similar efficiency profile, though multiple compressors often generate more ambient heat, making them work harder.
- Total Amps: 9 units x 3 Amps = 27 Amps total draw.
The Calculation:
- Power per unit = 3A x 230V = 690 Watts (0.69 kW).
- Total Power (9 units) = 6.21 kW.
- Daily Consumption = 6.21 kW x 24 hours x 60% runtime = 89.42 kWh per day.
The Verdict: Massive Savings with a Walk-In Solution
The numbers speak for themselves.
- Walk-In Coldroom: ~23 kWh per day
- Chest Freezers: ~89 kWh per day
By switching from multiple individual units to a single consolidated coldroom, you are consuming almost 75% less energy.
If we assume an electricity cost of roughly £0.30 per kWh, the daily difference is stark:
- Coldroom Cost: £6.95 per day
- Chest Freezer Cost: £26.82 per day
Over the course of a year, opting for a walk-in coldroom vs chest freezer setup could save your business over £7,000 in electricity alone. That is a significant saving that goes straight back into your budget.
Beyond the Bill: Compliance and Operational Benefits
While the cost savings are compelling, for our pharmaceutical clients, money isn’t the only metric. A walk-in coldroom offers superior operational advantages that are critical for compliance and security.
1. Unified Temperature Monitoring
Monitoring 9 separate freezers means 9 separate data loggers, 9 potential points of failure, and 9 sets of calibration records to maintain for your audits. With a walk-in coldroom, you have one integrated system. Our units come with advanced real-time monitoring that provides a single, comprehensive audit trail, making MHRA compliance much simpler.
2. Temperature Stability
Opening a chest freezer exposes the entire top layer of product to ambient air immediately. A walk-in coldroom, especially one fitted with PVC strip curtains, retains its internal temperature far better during access. This reduces temperature excursions and protects your high-value inventory.
3. Workflow Efficiency
Digging through the bottom of a deep chest freezer to find a specific batch number is a nightmare for stock rotation. A walk-in coldroom allows for shelving and racking. Your team can walk in, locate the product instantly, and ensure “First In, First Out” (FIFO) protocols are strictly followed.
Maximising Your Efficiency
At Wessex Refrigeration Hire, we are committed to helping you achieve the most efficient setup possible. We don’t just drop off a box; we help you configure it.
To keep your running costs as low as possible, we ensure:
- Top-Tier Insulation: We use 85mm or 100mm panels to minimize thermal loss.
- Proper Sizing: We help you calculate the exact space you need so you aren’t paying to cool empty air.
- Maintenance: Our rental agreements include servicing, ensuring coils are clean and seals are tight for maximum efficiency.
Ready to Streamline Your Storage?
If you are currently juggling multiple freezers or planning a new storage facility, let’s look at the numbers together. A switch to a walk-in coldroom could improve your compliance, streamline your operations, and significantly cut your energy bills.
We would love to hear from you! If you have questions about transitioning to a more efficient storage solution, or if you need a specific calculation for your facility, contact us any time.
Call our team on 01458 552 323 or drop us an email for a consultation.