A chiller is a complete-package concept, while a refrigeration unit covers a broader scope. If you look only at the name when purchasing, you can easily miss the operating conditions and the supply boundary. The real difference between a chiller and a refrigeration unit is that the former explicitly delivers cooling capacity using water or a glycol solution as the secondary refrigerant, while the latter may refer only to the compressor-condenser section, or it may be a complete cooling source. Check the cooling capacity basis, evaporating temperature, secondary refrigerant and control interlocks first, then discuss price.
Thing One: Define the Role First — One Is a Complete Secondary-Refrigerant Package, the Other Is a Cooling Source Concept
A refrigeration unit answers "how the cooling capacity is produced." It is a component-level or unit-level concept: it may include only the compressor-condenser section, or it may also include the evaporator. The name alone does not guarantee that pumps and secondary-refrigerant-side piping are included, nor that the rink control interlocks have been completed.
A chiller answers "in what state the cooling capacity is delivered." The data sheet should specify the secondary refrigerant, supply and return liquid temperatures, flow rate, available cooling capacity and the corresponding evaporating temperature. When an ice rink uses a low-temperature glycol system, you cannot simply substitute catalog capacity rated at normal-temperature air-conditioning conditions.
Do not submit an inquiry that says only "one set of refrigeration main unit." First distinguish the main unit from the terminal equipment in the real ice rink equipment and related products list, then confirm the boundaries of piping, power distribution, commissioning and interlock responsibility in the ice rink design and construction scope. Only then are quotes comparable.
Thing Two: The Difference Between a Chiller and a Refrigeration Unit Comes Down to Four Parameters
| Item to verify | Typical wording for refrigeration units | Additional procurement specifications to require for a complete secondary coolant system |
|---|
| System boundary | May be component-level or unit-level; the boundary varies by proposal | Whether the evaporator, secondary coolant connections, and controls are included |
| Cooling capacity basis | May state cooling capacity at only one operating condition | Require usable cooling capacity and input power to be stated together with the corresponding operating conditions |
| Evaporating temperature | Must be confirmed separately; it cannot be inferred from the name | Correlate with the secondary coolant supply and return conditions, and compare at the same operating conditions |
| Secondary coolant | May feed direct-expansion terminals or a secondary heat exchanger | Specify water or glycol solution, and verify flow rate, freeze point, and material requirements |
| Control interlocks | May not include terminal and pump package controls | Require clear pump sequencing, low-flow, freeze protection, fault shutdown, and restart logic |
The capacity basis is where errors most often occur. Compressor capacity, condenser-side heat rejection, and usable capacity on the secondary coolant side are not the same thing; capacities at different evaporating temperatures also cannot be compared directly. Therefore, for chiller procurement, first standardize the data sheet, then have each supplier quote against it — do not accept a single kW figure.
Dehumidification should also not be lumped into the chiller capacity and glossed over. Its load and number of units should be calculated separately, and control interfaces confirmed separately; refer to How to select a dehumidifier for an ice rink: load, number of units, and pitfalls to avoid.
Item Three: Budget Chillers by Cooling Capacity Band, Not by Name
The table below is only for budgeting the equipment itself by band, not for the total ice rink project price. Pump packages, piping, power distribution, installation, and civil works are usually separate; low-temperature conditions, heat exchangers, compressor configuration, and redundancy strategy can all change the band. Actual contract amounts vary with configuration and are ultimately calculated per project.
| Cooling capacity band, for budget classification only | Common complete-unit approach | Estimated equipment cost | Key checks |
|---|
| Below 100 kW | Scroll, modular solution | Typically 5-15 × 10,000 CNY | Low-temperature cooling capacity, independent circuit |
| 100-300 kW | Multi-compressor scroll or screw solution | Typically 12-35 × 10,000 CNY | Secondary refrigerant, part load, pump package interface |
| 300-600 kW | Screw complete-unit solution | Typically 30-80 × 10,000 CNY | Evaporation temperature, heat exchanger, control interlock |
| Above 600 kW or low-temperature custom | Multi-unit parallel or custom screw solution | Typically 60-150 × 10,000 CNY | System zoning, redundancy strategy, power distribution conditions |
The cooling capacity brackets in the table are only for procurement budget classification and do not replace load calculations. Even within the same 300-600 kW range, an ambient-temperature chilled water solution and a low-temperature glycol solution cannot be compared directly by the table. Align the parameters first, then compare power, modulation range, and supply scope.
Three sizing questions
If your site is a small project with a cooling demand below 100 kW and limited mechanical room space, choose a modular scroll chiller, and focus on verifying usable cooling capacity under low-temperature conditions, independent circuits, and staged capacity control. Do not omit flow and freeze-protection interlocks just to keep the equipment bracket lower; also specify clearly upfront who supplies the pump package, plate heat exchanger, and secondary coolant piping.
If your site is a standard indoor ice rink with a cooling capacity bracket of 300-600 kW, choose a screw chiller calculated at the design evaporating temperature, and show the ice surface, secondary coolant pumps, and control system on the same interface drawing. Whether to provide a standby unit should not be based only on the cooling capacity bracket; it also depends on operating hours, maintenance conditions, and the acceptable risk of ice downtime.
If your site is an ice and snow park with loads beyond the ice surface, such as a snow room or dehumidification, choose a refrigeration solution calculated zone by zone, and do not use one chiller to cover the entire facility. The ice surface requires a stable secondary coolant supply, while other areas have different temperature and control logic; first determine whether to use independent cooling sources, a shared cooling source, or time-scheduled operation, then compare equipment-only prices.
How to link the parameters for a 1,200 m² indoor ice rink
Calculate the load first, not the unit model. For a standard indoor ice rink, take the cooling load as 350-450 W/m² of ice surface area; a 1,200 m² indoor ice rink roughly corresponds to 420-540 kW of cooling capacity. For each 1 m increase in ceiling height, the cooling load increases by about 3-5 percentage points; the building envelope typically uses 100-150 mm polyurethane cold-room panels. If building conditions change, the load table must be updated accordingly.
In this scenario, the chiller must be selected based on design conditions and its energy consumption must also be checked against the operating strategy. Covering the ice with insulation blankets from 22:30-09:30 at night can reduce the ice surface load from about 220 kW to about 25 kW, saving about 700 kWh per day; however, do not use the nighttime low load to back-calculate the daytime chiller configuration.
For domestic 1,200 m²-class indoor ice rinks, overall electricity consumption is about 1.7 kWh/m²·day, understood on an annual average basis. This equates to about 2,040 kWh/day, but this is overall electricity consumption, not chiller electricity consumption. Separate cooling capacity, power, and operating strategy so that quotes are comparable.
Conclusion: Lock Down Four Things First in the Procurement List
First, confirm the scope of supply—determine whether the delivery is a complete chilled-water packaged unit or only the cold-source components. Next, put the cooling capacity basis, evaporating temperature, and coolant conditions into the same data sheet, and do not compare prices directly across different operating conditions. Then clearly list the interlock responsibilities for the pump group, freeze protection, fault shutdown, and dehumidification interface, and prepare the budget by cooling capacity range. When selecting a chiller, base the decision on the parameter sheet, interface diagram, and project calculation results—not on the product name.
